WO2024001751A1 - 电驱动***及电动车 - Google Patents

电驱动***及电动车 Download PDF

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Publication number
WO2024001751A1
WO2024001751A1 PCT/CN2023/099748 CN2023099748W WO2024001751A1 WO 2024001751 A1 WO2024001751 A1 WO 2024001751A1 CN 2023099748 W CN2023099748 W CN 2023099748W WO 2024001751 A1 WO2024001751 A1 WO 2024001751A1
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WO
WIPO (PCT)
Prior art keywords
bearing
module
drive system
motor
electric drive
Prior art date
Application number
PCT/CN2023/099748
Other languages
English (en)
French (fr)
Inventor
钟辉
吴瑞文
王园
许克朋
金毅君
Original Assignee
苏州汇川联合动力***股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 苏州汇川联合动力***股份有限公司 filed Critical 苏州汇川联合动力***股份有限公司
Publication of WO2024001751A1 publication Critical patent/WO2024001751A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • This application relates to the technical field of new energy vehicles, and in particular to an electric drive system and an electric vehicle.
  • the electric drive system of new energy vehicles at least includes a drive motor and a motor controller.
  • a drive motor During operation of an electric drive system, common-mode voltages and high-frequency loop currents are generated. Due to the voltage dividing effect of parasitic capacitance in the electric drive system, the common mode voltage will cause a voltage drop between the inner and outer rings of the bearing.
  • the common-mode shaft voltage exceeds the critical voltage of the bearing oil film, the oil film is broken down, and EDM (Electrical Discharge Machining) discharge occurs, causing ablation of the inner and outer rings and ball surfaces of the bearing and the appearance of spots. Frequent EDM discharges occur over a long period of time. , will cause obvious washboard marks on the surface of the inner and outer rings of the bearing and the ball surface, that is, electrical corrosion of the bearing, causing vibration and noise in the motor, affecting the operation of the motor.
  • EDM Electro Discharge Machining
  • the main purpose of this application is to provide an electric drive system and an electric vehicle, aiming to solve the technical problem of bearing electric corrosion in the motor of the electric drive system in the prior art.
  • this application provides an electric drive system, including:
  • the motor includes a motor housing, a bearing and a rotating shaft located in the motor housing;
  • Bearing electric corrosion suppression device includes a series-connected capacitor module and a first resistor module
  • the input end of the bearing electric corrosion suppression device is electrically connected to the rotating shaft, and the output end of the bearing electric corrosion suppression device is grounded.
  • the bearing electric corrosion inhibition device further includes:
  • Reactance module the input end of the reactance module is connected to the first resistance module, and the output end of the reactance module is grounded.
  • the bearing electric corrosion inhibition device further includes:
  • the second resistance module is connected in parallel with the series-connected capacitance module and the first resistance module, or the second resistance module is connected in parallel with the series-connected capacitance module, the first resistance module and the reactance module.
  • the capacitance module includes a plurality of electrically connected capacitors
  • the first resistance module includes a plurality of electrically connected resistors
  • the reactance module includes a plurality of electrically connected magnetic beads. and/or a plurality of electrically connected inductors
  • the second resistance module includes a plurality of electrically connected resistors.
  • the electric drive system further includes:
  • the bearing electric corrosion suppression device is provided on the motor, the motor controller or the reducer.
  • the electric drive system further includes:
  • the bearing is arranged in the motor housing, the bearing is sleeved on the outside of the rotating shaft, and the insulating member is arranged between the bearing and the end cover of the motor.
  • the input end of the bearing electric corrosion inhibition device passes through a conductive bypass
  • the parts are electrically connected to the rotating shaft.
  • the electric drive system further includes:
  • the reducer electrically connected to the motor, the reducer including a reducer shaft connected to the rotating shaft;
  • the input end of the bearing electric corrosion suppression device is electrically connected to the reducer shaft through a conductive bypass part.
  • the electric drive system further includes:
  • a motor controller electrically connected to the motor
  • the output end of the bearing electric corrosion suppression device is electrically connected to the motor housing, and the motor housing is grounded;
  • the output end of the bearing electric corrosion suppression device is electrically connected to the housing of the motor controller, and the housing of the motor controller is grounded.
  • this application provides an electric vehicle, including:
  • the battery is used to provide electrical energy to the electric drive system.
  • the electric drive system includes a motor and a bearing electric corrosion suppression device.
  • the rotating shaft of the motor is grounded through the bearing electric corrosion suppression device.
  • a bearing circuit composed of a capacitor module and a first resistance module connected in series is used.
  • the corrosion suppression device can reduce the common mode voltage of the inner and outer rings of the bearing, avoid breakdown of the oil film and generate EDM discharge when the voltage of the inner and outer rings is too high, and has the effect of inhibiting electrical corrosion of the bearing; at the same time, the series-connected capacitor module and the first resistance module can inhibit High-frequency loop current avoids the impact of shaft current on bearings and has the effect of extending the service life of bearings.
  • Figure 1 is a common mode equivalent circuit of an electric drive system in the prior art
  • Figure 2 is an equivalent circuit diagram of the first embodiment of the electric drive system of the present application
  • Figure 3 is an equivalent circuit diagram of the second embodiment of the electric drive system of the present application.
  • Figure 4 is an equivalent circuit diagram of the third embodiment of the electric drive system of the present application.
  • Figure 5 is an equivalent circuit diagram of the bearing electric corrosion suppression device in the third embodiment of the electric drive system of the present application.
  • Figure 6 is an equivalent circuit diagram of the fourth embodiment of the electric drive system of the present application.
  • Figure 7 is an equivalent circuit diagram of the bearing electric corrosion suppression device in the fourth embodiment of the electric drive system of the present application.
  • Figure 8 is a schematic structural diagram of the bearing electric corrosion suppression device in the fifth embodiment of the electric drive system of the present application.
  • Figure 9 is a schematic structural diagram of the fifth embodiment of the electric drive system of the present application.
  • Figure 10 is a schematic diagram of the position of the bearing electric corrosion suppression device in the sixth embodiment of the electric drive system of the present application.
  • Figure 11 is a schematic diagram of another position of the bearing electric corrosion suppression device in the sixth embodiment of the electric drive system of the present application.
  • Figure 12 is a schematic diagram of the position of the bearing electric corrosion suppression device in the seventh embodiment of the electric drive system of the present application.
  • Figure 13 is a schematic diagram of another position of the bearing electric corrosion suppression device in the seventh embodiment of the electric drive system of the present application.
  • connection can be a fixed connection, a detachable connection, or an integral body; it can It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary; it can be an internal connection between two components or an interaction between two components.
  • connection can be a fixed connection, a detachable connection, or an integral body; it can It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary; it can be an internal connection between two components or an interaction between two components.
  • the electric drive system of new energy vehicles at least includes a drive motor and a motor controller.
  • the PWM signal wave output by the motor controller will generate a common mode voltage between the midpoint of the DC bus and the midpoint of the three-phase winding of the driving motor; at the same time, due to the rapid switching of the switching devices in the motor controller characteristics, resulting in a high dv/dt value.
  • This dv/dt value and the coupling capacitance between the stator winding and the casing jointly cause a high-frequency common-mode current.
  • This high-frequency common-mode current excites an annular common-mode magnetic flux in the iron core. , and induces a shaft voltage on the rotating shaft, generating a high-frequency loop current.
  • the bearings at the motor end, the bearings at the non-driving end of the reducer, and the bearings at the driving end of the reducer are prone to damage.
  • the common mode voltage will cause a voltage drop between the inner and outer rings of the bearing.
  • the common-mode shaft voltage exceeds the critical voltage of the bearing oil film, the oil film is broken down and EDM discharge occurs, causing ablation of the inner and outer rings and ball surfaces of the bearing and the appearance of spots. Frequent EDM discharge for a long time will cause the inner and outer rings of the bearing and the ball surface to appear. Obvious washboard marks appear, that is, electrical corrosion of the bearings, which causes vibration and noise in the motor, affecting the operation of the motor.
  • the above solution is mainly aimed at suppressing bearing electric corrosion of 400V high-voltage silicon (Si) products.
  • SiC silicon carbide
  • the dv/dt value will become higher, and the high-frequency loop current generated will also become larger.
  • the problem with the above solution is that the high-frequency loop currents of the motor-end bearing and the reducer-end bearing are relatively large, and the high-frequency loop current generated by the reducer-end bearing The circuit voltage is relatively high, and the phenomenon of bearing electrical corrosion still exists.
  • the sealing performance of the conductive ring that achieves single-end conduction is difficult to ensure, and the conductive effect will also be affected.
  • the electric drive system may include a motor and a bearing electric corrosion suppression device.
  • the motor may include a motor casing, a bearing and a rotating shaft located in the motor casing, the inner ring of the bearing is connected to the rotating shaft, and the outer ring of the bearing is connected to the motor casing.
  • the motor may also include a rotor and a stator.
  • the stator has components such as a stator core and a stator winding.
  • the motor may also include components such as splines and position sensors.
  • the motor structure is a technical solution known in the art and will not be discussed here. Again.
  • Figure 1 shows the common mode equivalent circuit of the electric drive system in the prior art. Specifically, there is a parasitic capacitance C b on the bearing of the motor, a coupling capacitance C sr between the stator core and the rotor, and the stator winding and There is a coupling capacitance C wr between the rotors, a coupling capacitance C wf between the stator winding and the stator, and a parasitic capacitance C g between the reducer side bearing and the splines.
  • the high dv/dt value and the coupling capacitance together cause a high-frequency common mode current.
  • This high-frequency common mode current excites an annular common mode flux in the iron core, and generates The rotating shaft induces a common-mode shaft voltage, which generates a high-frequency loop current.
  • this embodiment proposes an electric drive system including a bearing electric corrosion suppression device.
  • the input end of the bearing electro-corrosion inhibition device is electrically connected to the rotating shaft of the motor in the electric drive system, and the output end of the bearing electro-corrosion inhibition device is grounded.
  • the bearing electro-corrosion inhibition device can be connected in parallel with the bearing in the motor, specifically with the bearing.
  • Parasitic capacitance C b is connected in parallel;
  • the bearing electric corrosion suppression device is used to suppress high-frequency loop current generated on the bearing.
  • the bearing electric corrosion suppression device may include:
  • the capacitor module and the first resistor module are connected in series.
  • the input end of the bearing electric corrosion suppression device is electrically connected to the rotating shaft of the motor, and the output end is grounded, that is, the rotating shaft of the motor is grounded through the bearing electric corrosion suppressing device.
  • the input end of the capacitor module is electrically connected to the rotating shaft of the motor, the output end of the capacitor module is connected to the input end of the first resistance module, and the output end of the first resistance module is grounded as the output end of the bearing electric corrosion suppression device.
  • the equivalent circuit diagram of the electric drive system is shown in Figure 2.
  • the series-connected capacitor module and the first resistor module constitute the bearing electric corrosion suppression device.
  • the capacitance module can be implemented by one capacitor, or multiple capacitors connected in series and/or parallel.
  • the first resistance module can be implemented by one resistor, or multiple resistors connected in series and/or parallel.
  • the capacitance module is implemented by a capacitor C d
  • the first resistance module is implemented by a resistor R d .
  • the bearing electric corrosion suppression device is formed by the series connection of the capacitor C d and the resistor R d . Specific applications can be selected according to actual needs, and are not limited here.
  • the series capacitor C d and resistor R d are connected in parallel with the parasitic capacitance C b of the bearing to divide the voltage of the inner and outer rings of the bearing, reduce the common mode voltage of the inner and outer rings of the bearing, and avoid the situation when the voltage of the inner and outer rings is too high. Breakdown of the oil film produces EDM discharge, which causes electrical corrosion to the bearings.
  • V b K f B r V com
  • V b represents the common mode voltage of the inner and outer rings of the bearing
  • Br represents the voltage division ratio
  • V com represents the common mode shaft voltage on the rotating shaft
  • the capacitor C d of the bearing electric corrosion suppression device is connected in parallel with the bearing of the motor, which can divide the voltage between the inner ring and the outer ring of the bearing, and adjust the voltage dividing ratio to make the common mode voltage of the inner and outer rings of the bearing V b is reduced to avoid breakdown of the oil film and EDM discharge when the voltage of the inner and outer rings is too high, thereby causing electrical corrosion to the bearing; resistor R d and capacitor C d are connected in series to reduce the loop current and avoid the impact of differential mode voltage on the bearing.
  • the capacitor module and the first resistor module in the bearing electric corrosion suppression device are connected in series, which can also avoid electromagnetic interference caused by EMI exceeding the standard caused by instantaneous high-frequency waves during charging and discharging.
  • the rotating shaft of the motor is grounded through the bearing electrocorrosion suppression device.
  • the bearing electrocorrosion suppression device composed of a capacitor module and a first resistor module connected in series can reduce the common mode voltage of the inner and outer rings of the bearing and avoid internal and external corrosion.
  • the ring voltage is too high, it breaks down the oil film and generates EDM discharge, which has the effect of inhibiting the electrical corrosion of the bearing.
  • the capacitor module and the first resistor module in series can inhibit the high-frequency loop current, avoid the impact of the shaft current on the bearing, and extend the service life of the bearing. longevity effect.
  • the bearing electric corrosion suppression device may also include:
  • Reactance module the input end of the reactance module is connected to the first resistance module, and the output end is connected to the ground.
  • the bearing electric corrosion suppression device is a capacitor module, a first resistance module and a reactance module connected in series.
  • the input end of the bearing electric corrosion suppression device is electrically connected to the rotating shaft of the motor, and the output end is grounded, that is, the input end of the capacitor module is electrically connected to the rotating shaft of the motor, and the output end of the capacitive module is connected to the reactance module through the first resistance module.
  • the input end is connected, and the output end of the reactance module is grounded as the output end of the bearing electric corrosion suppression device.
  • the equivalent circuit diagram of the electric drive system is shown in Figure 3.
  • the series-connected capacitor module, the first resistance module and the reactance module constitute the bearing electric corrosion suppression device. suppression device.
  • the reactance module may include an inductor and/or magnetic beads.
  • the reactance module may be implemented by one inductor, or multiple inductors connected in series and/or in parallel. It may also be implemented by one magnetic bead, or multiple magnetic beads connected in series and parallel. /Or implemented in parallel.
  • the reactance module can also be implemented by one or more inductors and one or more magnetic beads, and the inductor and magnetic beads are connected in series and/or in parallel.
  • the reactance module is implemented by a magnetic bead FB d
  • the bearing electric corrosion suppression device is composed of a series-connected capacitor C d , a resistor R d and a magnetic bead FB d .
  • Specific applications can be selected according to actual needs, and are not limited here.
  • the series-connected capacitor C d , resistor R d and magnetic bead FB d are connected in parallel with the parasitic capacitance C b of the bearing to divide the voltage of the inner and outer rings of the bearing, which can avoid breakdown of the oil film when the voltage of the inner and outer rings is too high. EDM discharges, causing electrical corrosion to the bearings; the magnetic bead FB d is connected in series with the resistor R d and capacitor C d , which can take advantage of the characteristics of the magnetic beads with low frequency and low resistance and high frequency and high resistance to effectively reduce the high-frequency loop current without affecting low frequency.
  • the increase in the common mode voltage V b of the inner and outer rings of the bearing avoids the impact of high-frequency differential mode voltage on the bearing.
  • the electric drive system provided in this embodiment not only has the beneficial effects of the electric drive system provided in Embodiment 1, but also effectively reduces the energy consumption through the high-frequency and high-impedance characteristics of the reactance module.
  • the high-frequency loop current enables the electric drive system to cope with the impact of greater high-frequency loop current generated by the high dv/dt value characteristics of silicon carbide switching devices.
  • the bearing electric corrosion suppression device may also include:
  • the second resistance module is connected in parallel with the capacitance module and the first resistance module connected in series.
  • the bearing electric corrosion suppression device in this embodiment has two circuits, one circuit is a capacitor module and a first resistor module connected in series, and the other circuit is a separate second resistor module.
  • the input end of the bearing electric corrosion suppression device is electrically connected to the rotating shaft of the motor, and the output end is grounded, that is, the input end of the capacitor module and the input end of the second resistance module are both electrically connected to the rotating shaft of the motor, and the output end of the capacitive module is electrically connected to the rotating shaft of the motor. It is connected to the input end of the first resistance module, and the output end of the first resistance module is connected in parallel with the output end of the second resistance module to be grounded as the output end of the bearing electric corrosion suppression device.
  • the equivalent circuit diagram of the electric drive system is shown in Figure 4.
  • the second resistor module is connected in parallel with the series-connected capacitor module and the first resistor module to form The bearing electric corrosion suppression device is installed.
  • the charge on the motor shaft to the ground can be further released to assist in reducing the shaft voltage.
  • the capacitance module can be implemented by a capacitor, or multiple capacitors connected in series and/or parallel.
  • the first resistance module can be implemented by a resistor, or multiple resistors connected in series and/or parallel.
  • the second resistance module can also be implemented by a resistor. It can be implemented by one resistor, or multiple resistors connected in series and/or in parallel. In specific applications, the number of each electronic device can be adjusted according to actual needs, and is not limited here.
  • the capacitor module uses a capacitor C d
  • the first resistance module uses a resistor R d
  • the second resistance module uses a resistor Re .
  • the resistor Re and the series-connected capacitor C d It is connected in parallel with the resistor R d to form the bearing electric corrosion suppression device of the electric drive system in this embodiment.
  • the capacitance module may include several electrically connected capacitors
  • the first resistance module may include several electrically connected resistors
  • the second resistance module may include several electrically connected resistors.
  • the above-mentioned electrical connection may include series connection and/or parallel connection, specifically including but not limited to several electronic devices connected in series, several electronic devices connected in parallel, several electronic device groups connected in series or several electronic device groups connected in parallel, wherein the electronic devices
  • the device group is a number of electronic devices connected in series or a number of electronic devices connected in parallel, which can be set according to the actual situation and is not limited here.
  • the capacitance of the capacitor module or the resistance of the first resistor module and the second resistor module can be freely adjusted to meet the needs of different models of products and improve broad adaptability.
  • the electrical connection method can be selected according to actual needs, the number of electronic devices can be set according to actual needs, and device parameters can be adjusted according to actual needs, so that the bearing electric corrosion suppression device can achieve the best suppression effect.
  • one resistor R e is the second resistance module in the bearing electric corrosion suppression device
  • one resistor R d is The first resistor module and the capacitor module C d may be composed of a parallel capacitor C1 and a capacitor C2.
  • the circuit composed of resistor Re , resistor Rd , capacitor C1 and capacitor C2 can be connected to the rotating shaft on one side and the motor shell on the other side to achieve grounding.
  • a circuit composed of resistor R d , capacitor C1 and capacitor C2 can be used to suppress the common mode voltage acting on the inner and outer rings of the bearing and reduce the amplitude of differential mode voltage fluctuations.
  • two parallel-connected Capacitor C1 and capacitor C2 can adjust the phase and amplitude of the differential mode voltage and assist in reducing the shaft voltage; while another circuit composed of resistor R e can release the charge from the motor shaft to the ground.
  • the electric drive system provided in this embodiment not only has the beneficial effects of the electric drive system provided in Embodiment 1, but also can release common mode charges and reduce high-frequency waves during charging and discharging. caused by electromagnetic interference.
  • multiple capacitors are connected in series/parallel to form a capacitor module, and multiple resistors are connected in series/parallel to form the first resistance module and the second resistance module.
  • the capacitance of the capacitor module and the first resistance module and the second resistance module can be determined.
  • the resistance value can be adjusted freely, which has higher applicability, so that the bearing electric corrosion suppression device can achieve the best suppression effect.
  • the bearing electric corrosion suppression device in the electric drive system may also include:
  • the second resistance module is connected in parallel with the capacitance module, the first resistance module and the reactance module connected in series.
  • the bearing electric corrosion suppression device in this embodiment has two circuits, one circuit is a capacitor module, a first resistor module and a reactance module connected in series, and the other circuit is a single second resistor module.
  • the input end of the bearing electric corrosion suppression device is electrically connected to the rotating shaft of the motor, and the output end is grounded, that is, the input end of the capacitor module and the input end of the second resistance module are both electrically connected to the rotating shaft of the motor, and the output end of the capacitive module is electrically connected to the rotating shaft of the motor.
  • the input end of the first resistance module is connected to the reactance module, and the output end of the reactance module is connected in parallel with the output end of the second resistance module, which serves as the output end of the bearing electric corrosion suppression device and is grounded.
  • the equivalent circuit diagram of the electric drive system is shown in Figure 6.
  • the second resistor module is connected in parallel with the series-connected capacitor module, the first resistor module and the reactance module. Finally, the bearing electric corrosion suppression device is constructed.
  • the charge on the motor shaft to the ground can be further released and assist in reducing the shaft voltage.
  • the capacitance module can be implemented by a capacitor, or multiple capacitors connected in series and/or parallel.
  • the first resistance module can be implemented by a resistor, or multiple resistors connected in series and/or parallel.
  • the second resistance module can also be implemented by a resistor. It can be implemented by a resistor, or multiple resistors connected in series or parallel.
  • the reactance module can be implemented by an inductor, or multiple inductors connected in series and/or parallel.
  • the reactance module can also be implemented by a magnetic bead, or multiple magnetic beads. Beads are connected in series and/or parallel.
  • the reactance module can also be implemented by one or more inductors and one or more magnetic beads.
  • the inductor and magnetic beads are connected in series and/or parallel. In specific applications, the number of each electronic device can be adjusted according to actual needs and is not limited here.
  • the capacitance module uses a capacitor C d
  • the first resistance module uses a resistor R d
  • the reactance module uses a magnetic bead FB d
  • the second resistance module uses a resistor Re .
  • the resistor Re is connected in parallel with the series-connected capacitor C d , the resistor R d and the magnetic bead FB d to form the bearing electric corrosion suppression device of the electric drive system in this embodiment.
  • the capacitance module may include several electrically connected capacitors
  • the first resistance module may include several electrically connected resistors
  • the reactance module may include several electrically connected magnetic beads and/or several electrically connected inductors.
  • the second resistance module may include several electrically connected resistors.
  • the above-mentioned electrical connection may include series connection and/or parallel connection, specifically including but not limited to several electronic devices connected in series, several electronic devices connected in parallel, several electronic device groups connected in series or several electronic device groups connected in parallel, wherein the electronic devices
  • the device group is a number of electronic devices connected in series or a number of electronic devices connected in parallel.
  • the specific connection method can be set according to the actual situation and is not limited here.
  • the capacitance value of the capacitor module, the characteristics of the reactance module, or the resistance values of the first resistance module and the second resistance module can be freely adjusted to meet the needs of different models of products and improve broad adaptability.
  • the electrical connection method can be selected according to actual needs, the number of electronic devices can be set according to actual needs, and device parameters can be adjusted according to actual needs, so that the bearing electric corrosion suppression device can achieve the best suppression effect.
  • FIG. 7 is an equivalent circuit diagram of the bearing electric corrosion suppression device in this embodiment
  • one resistor R e is the second resistance module in the bearing electric corrosion suppression device
  • one resistor R d is The first resistance module
  • a magnetic bead FB d is the reactance module in the bearing electric corrosion suppression device
  • the capacitance module C d can be composed of a parallel capacitor C1 and a capacitor C2.
  • the circuit composed of resistor Re, resistor Rd , magnetic bead FBd , capacitor C1 and capacitor C2 can be connected to the rotating shaft on one side and the motor shell on the other side to achieve grounding.
  • a circuit composed of resistor R d , magnetic bead FB d , capacitor C1 and capacitor C2 can be used to suppress the common mode voltage acting on the inner and outer rings of the bearing and reduce the amplitude of differential mode voltage fluctuations, where, Through the two capacitors C1 and C2 connected in parallel, the phase and amplitude of the differential mode voltage can be adjusted to assist in reducing the shaft voltage; while another circuit composed of the resistor R e can release the charge from the motor shaft to the ground.
  • the electric drive system provided in this embodiment not only has all the beneficial effects of the electric drive system provided in Embodiment 2 above, but also can release common mode charges and reduce charging and discharging time. high frequency electromagnetic interference caused by waves.
  • multiple capacitors are connected in series/parallel to form a capacitor module
  • multiple inductors and/or magnetic beads are connected in series/parallel to form a reactance module
  • multiple resistors are connected in series/parallel to form the first resistance module and the second resistance module.
  • the capacitance of the capacitor module, the characteristics of the reactance module, and the resistance of the first resistance module and the second resistance module can be freely adjusted, which has higher applicability, so that the bearing electric corrosion suppression device can achieve the best suppression effect. .
  • the bearing electric corrosion suppression device of the electric drive system may also include:
  • the capacitor module, the first resistor module, the reactance module and the second resistor module can all be arranged on the PCB board 60 (Printed Circuit Board).
  • the capacitance module, the first resistance module, the reactance module and the second resistance module can constitute different circuit structures used in any one of the above-mentioned embodiments one to four, and are correspondingly arranged in the electronic device module 10 .
  • the bearing electric corrosion suppression device includes a capacitor module and a first resistor module
  • the electronic device module 10 that is, the capacitor module and the first resistor module
  • the bearing electric corrosion suppressor device includes a capacitor module and a first resistor module
  • the bearing electric corrosion suppression device includes a capacitor module, a first resistor module and a second resistor module
  • the electronic device module 10 is a capacitor module, a first resistor module and a reactance module.
  • the device module 10 that is, the capacitor module, the first resistor module and the second resistor module are all disposed on the PCB board 60 , or the capacitor module and the first resistor module are disposed on the PCB board 60 , and the second resistor module is disposed outside the PCB board 60 other positions; when the bearing electric corrosion suppression device includes a capacitance module, a first resistance module, a reactance module and a second resistance module, the electronic device module 10, that is, the capacitance module, the first resistance module, the reactance module and the second resistance module are all configured Alternatively, the capacitance module, the first resistance module and the reactance module are arranged on the PCB board 60 , and the second resistance module is arranged at another position other than the PCB board 60 . In specific applications, it can also be set according to actual needs.
  • the bearing electric corrosion suppression device of the electric drive system may also include:
  • the support member 90 is provided below the PCB board 60 , and the PCB board 60 is provided with electrical connection fixing holes 61 .
  • the support member 90 may be made of plastic material to play an insulating effect.
  • the conductive bypass part 70 can be fixed on the support 90 by screws passing through the electrical connection fixing holes 61 on the PCB board 60 to achieve electrical connection between the conductive bypass part 70 and each device in the electronic device module 10 of the bearing electric corrosion suppression device. connect.
  • the PCB board 60 can also be grounded, for example, by screws passing through other electrical connection fixing holes 61 on the PCB board 60 to connect to the resolver cover plate, casing, etc. of the motor.
  • the rotor current can be led to the PCB board 60 through the conductive bypass part 70, and then the current passes through the electronic device module in the bearing electric corrosion suppression device 10 and then flows to the ground or shell.
  • the electric drive system may also include:
  • Motor controller and reducer electrically connected to the motor
  • the bearing electric corrosion suppression device can be installed on the motor, motor controller or reducer.
  • the bearing electric corrosion suppression device can be installed at the non-driving end of the motor, or can be installed in the motor controller or reducer, and can also be integrated with the position sensor 80 wire to guide current to the motor controller housing.
  • the installation position of the bearing electric corrosion suppression device is not limited.
  • the reducer may include a reducer shaft, and the reducer shaft is connected to the rotating shaft 30 .
  • the bearing electric corrosion suppression device can be electrically connected to the rotating shaft 30 through the conductive bypass part 70, or can be electrically connected to the reducer shaft through the conductive bypass part 70. Since the reducer shaft is connected to the rotating shaft 30, At this time, the bearing electric corrosion suppression device is electrically connected to the rotating shaft 30 through the reducer shaft.
  • the conductive bypass part 70 can be any one of conductive carbon brushes, conductive rings, conductive spring pieces, conductive brushes, etc.
  • the input end of the bearing electric corrosion suppression device can be electrically connected to the rotating shaft 30 through the conductive bypass part 70 or to the reducer shaft through the conductive bypass part 70, and the output end of the bearing electric corrosion suppression device is grounded.
  • the grounding can be realized directly, or through the motor housing of the motor, or through the reducer housing of the reducer, or through the motor controller housing of the motor controller.
  • the output end of the bearing electric corrosion suppression device is grounded through the motor housing, specifically, it is directly electrically connected to the motor housing in the electric drive system, and the motor housing is then grounded; the output end of the bearing electric corrosion suppression device is grounded through the deceleration
  • the reducer housing is grounded, specifically by being directly electrically connected to the reducer housing in the electric drive system, and the reducer housing is then grounded; the output end of the bearing electrocorrosion suppression device is grounded through the motor controller housing, specifically by being directly connected to the electric drive system.
  • the motor controller housing is electrically connected, and the motor controller housing is grounded.
  • insulation treatment can be added at the non-drive end to prevent the bearings of the drive motor and reducer bearings in the electric drive system from being affected by the shaft current, thereby extending the life of the bearings. .
  • the electric drive system may further include:
  • the insulating member 50 and the bearing 40 are arranged in the motor housing.
  • the bearing 40 is sleeved on the outside of the rotating shaft 30 .
  • the insulating member 50 is arranged between the bearing 40 and the end cover 20 of the motor.
  • the material of the insulating member 50 may be high-strength plastic.
  • the shape of the insulating member 50 can be an insulating ring.
  • the insulating ring is installed outside the motor bearing 40.
  • the inner wall of the insulating ring can be in contact with the outer ring of the bearing 40.
  • the outer wall of the insulating ring can be in contact with the inner wall of the end cover 20.
  • the insulating ring is installed to the bearing 40 and the outer ring. Between the end caps 20, the bearing 40 and the housing are isolated.
  • the bearing electric corrosion suppression device is electrically connected to the rotating shaft 30 of the motor through the conductive bypass part 70.
  • the insulating member 50 is disposed between the bearing 40 and the end cover 20 of the motor.
  • the inner wall of the insulating member 50 is connected to the end cover 20 of the motor.
  • the outer wall of the bearing 40 is in contact with the inner wall of the motor end cover 20 .
  • the motor end cover 20 is a part of the motor housing.
  • the insulating member 50 can be used to isolate the bearing 40 from the motor housing.
  • the equivalent circuit of the electric drive system is shown in Figure 4 or Figure 6. After adding the insulating member 50, The parasitic capacitance C a of the insulator 50 will also divide the voltage of the bearing 40 , further improving the suppression effect on the shaft current.
  • the bearing 40 of the motor in the electric drive system may be an insulating bearing
  • the end cover 20 may be an insulating end cover.
  • An insulating coating can be coated on the surface of the bearing 40 to insulate the outer ring of the bearing 40 , or the bearing 40 can be directly made of insulating material.
  • the insulating end cap can also be directly made by applying an insulating coating or using insulating materials.
  • insulating bearings and insulating end covers can be used in the electric drive system at the same time, or insulating bearings or insulating end covers can be used alone; in addition, on the basis of using insulating bearings or insulating end covers, bearings 40 and An insulating piece 50 is added between the end caps 20 .
  • the end cover 20 of the motor is part of the motor housing.
  • Adding a bearing corrosion suppression device and insulation treatment to the electric drive system can also suppress high-frequency shaft voltage and prevent high-frequency shaft voltage from being transmitted to the axle shaft through the reducer shaft system, thereby avoiding EMC (Electro Electromagnetic Field) caused by the antenna effect of the axle shaft. Magnetic Compatibility, electromagnetic compatibility) issues.
  • EMC Electro Electromagnetic Field
  • the electric drive system provided in this embodiment based on the use of the bearing electric corrosion suppression device in any one of the first to fourth embodiments, further limits the hardware structure of the bearing electric corrosion suppression device, not only has all the benefits of the above embodiments
  • the stable installation of the bearing electric corrosion suppression device in the electric drive system is further ensured, which can meet the needs of more application scenarios; in addition, by adding insulation treatment, high frequency can be further suppressed shaft voltage to reduce electromagnetic interference caused by high-frequency waves.
  • the electric drive system includes a motor controller electrically connected to the motor, and the bearing electric corrosion suppression device is installed in the motor controller.
  • the input end of the bearing electric corrosion suppression device can be directly electrically connected to the rotating shaft 30 through the conductive bypass part 70 .
  • the conductive bypass part 70 can be any one of conductive carbon brushes, conductive rings, conductive spring pieces, conductive brushes, etc.
  • the output end of the bearing electric corrosion suppression device is electrically connected to the motor housing in the electric drive system, and the motor housing is grounded;
  • the output end of the bearing electric corrosion suppression device is electrically connected to the motor controller housing in the electric drive system, and the motor controller The case is grounded.
  • Figure 10 is a schematic diagram showing the position of the bearing electrocorrosion suppression device in the electric drive system of this embodiment.
  • the bearing electrocorrosion suppression device is installed in the motor controller, using the method as in Embodiment 1.
  • the capacitor module and the first resistor module include a capacitor C d and a resistor R d connected in series, and the PCB board 60 thereof is arranged in the motor controller.
  • the input end of the bearing electric corrosion suppression device is connected to the rotating shaft 30 of the motor, the output end is electrically connected to the motor controller housing, and the motor controller housing is grounded, that is, the grounding is achieved through the motor controller housing.
  • Figure 11 is a schematic diagram of another position of the bearing electric corrosion suppression device in the electric drive system of this embodiment.
  • the bearing electric corrosion suppression device is installed in the motor controller, using the method as in Embodiment 2.
  • the capacitance module, the first resistance module and the reactance module include a series-connected capacitor C d , a resistor R d and a magnetic bead FB d , and the PCB board 60 thereof is arranged in the motor controller.
  • the input end of the bearing electric corrosion suppression device is connected to the rotating shaft 30 of the motor, the output end is electrically connected to the motor controller housing, and the motor controller housing is grounded, that is, the grounding is achieved through the motor controller housing.
  • the bearing electric corrosion suppression device installed in the motor controller in this embodiment can be the bearing electric corrosion suppression device in any one of the above-mentioned Embodiments 1 to 4, and will not be described again here.
  • the bearing electric corrosion suppression device is directly installed in the motor controller.
  • the motor controller is an essential component for controlling the motor in the electric drive system, a device is installed in it.
  • the bearing electric corrosion suppression device can be used in many scenarios to meet actual needs and expands the application scope of the electric drive system, especially the bearing electric corrosion suppression device.
  • the electric drive system includes a reducer that is electrically connected to the motor, and a bearing electrocorrosion suppression device is installed in the reducer.
  • the reducer includes a reducer shaft, and the reducer shaft is connected to the rotating shaft 30 of the motor.
  • the input end of the bearing electric corrosion suppression device can be electrically connected to the reducer shaft in the electric drive system through the conductive bypass part 70 , and the reducer shaft is connected to the rotating shaft 30 .
  • the conductive bypass part 70 can be any one of conductive carbon brushes, conductive rings, conductive spring pieces, conductive brushes, etc.
  • the bearing electric corrosion suppression device is electrically connected to the reducer shaft and then indirectly electrically connected to the rotating shaft 30 .
  • the output end of the bearing electric corrosion suppression device is electrically connected to the motor housing in the electric drive system, and the motor housing is grounded;
  • the output end of the bearing electric corrosion suppression device is electrically connected to the reducer housing of the reducer in the electric drive system, and the reducer housing is grounded.
  • FIG 12 is a schematic position diagram of the bearing electric corrosion suppression device in the electric drive system of this embodiment.
  • the bearing electric corrosion suppression device is provided on the reducer side of the electric drive system, using
  • the capacitor module and the first resistor module in Embodiment 1 include a series-connected capacitor C d and a resistor R d , and the PCB board 60 is arranged in the motor controller.
  • the input end of the bearing electric corrosion suppression device is electrically connected to the reducer shaft
  • the reducer shaft is connected to the rotating shaft 30 of the motor
  • the output end of the bearing electric corrosion suppression device is electrically connected to the reducer housing
  • the reducer housing The body is grounded, that is, the grounding is achieved through the reducer housing.
  • Figure 13 is a schematic diagram of another position of the bearing electric corrosion suppression device in the electric drive system of this embodiment.
  • the bearing electric corrosion suppression device is arranged on the reducer side of the electric drive system, using
  • the capacitor module, the first resistor module and the reactance module in the second embodiment include a series-connected capacitor C d , a resistor R d and a magnetic bead FB d , and the PCB board 60 is arranged in the motor controller.
  • the input end of the bearing electric corrosion suppression device is electrically connected to the reducer shaft
  • the reducer shaft is connected to the rotating shaft 30 of the motor
  • the output end of the bearing electric corrosion suppression device is electrically connected to the reducer housing
  • the reducer housing The body is grounded, that is, the grounding is achieved through the reducer housing.
  • the bearing electric corrosion suppression device installed on the reducer side in this embodiment can be the bearing electric corrosion suppression device in any one of the above-mentioned Embodiments 1 to 4, and will not be described again here.
  • a bearing electric corrosion suppression device is installed on the reducer side of the electric drive system. This installation method can further reduce the impact of high-frequency loop current on the bearing electric corrosion on the reducer side.
  • the electric vehicle can include:
  • the battery is used to provide electric energy to the electric drive system.
  • the specific structure of the electric drive system can refer to any one of the above-mentioned embodiments one to seven.
  • electric vehicles can be electric vehicles, electric bicycles, electric tricycles and other electric-driven vehicles.
  • the above-mentioned battery can be regarded as a power supply system.
  • it can include a power supply device and a power management circuit.
  • the power management circuit converts and filters the voltage output by the power supply device and then provides it to the electric drive system.
  • it can provide It supplies the motor of the electric drive system to run the motor and realize the electric drive function.
  • the functions that can be realized by the above-mentioned internal devices of the power system and the power management circuit can be set according to actual needs, and are not limited in this embodiment.
  • a bearing electric corrosion suppression device is installed in parallel on the bearing of the motor.
  • the rotating shaft of the motor is grounded through the bearing electric corrosion suppression device.
  • the high frequency loop generated on the bearing is suppressed by the bearing electric corrosion suppression device. current, thereby achieving the effect of inhibiting electrical corrosion of the bearing and extending the service life of the bearing.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

本申请公开了一种电驱动***及电动车，涉及新能源汽车技术领域，该电驱动***包括电机和轴承电腐蚀抑制装置，电机包括电机壳体，设于电机壳体内的轴承和转轴，轴承电腐蚀抑制装置包括串联的电容模块和第一电阻模块，轴承电腐蚀抑制装置的输入端与转轴电连接，轴承电腐蚀抑制装置的输出端接地；电动车包括该电驱动***。

Description

电驱动***及电动车
相关申请
本申请要求于2022年6月30日申请的、申请号为202210763512.8以及于2023年4月28日申请的、申请号为202310483862.3的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及新能源汽车技术领域，尤其涉及一种电驱动***及电动车。
背景技术
新能源汽车的电驱动***至少包括驱动电机和电机控制器。在电驱动***运行过程中，会产生共模电压和高频环路电流。由于电驱动***中寄生电容的分压作用，共模电压会引起轴承内圈与外圈之间的电压降。当共模轴电压超过轴承油膜临界电压时，油膜被击穿，出现EDM(Electrical Discharge Machining，电火花加工)放电现象，使轴承内外圈及滚珠表面发生烧蚀而出现斑点，长时间频繁EDM放电，会使轴承内外圈及滚珠表面出现明显搓板纹，即轴承电腐蚀，令电机产生震动与噪声，影响电机运转。
在相关技术中，为了避免轴承发生电腐蚀，会对驱动电机设置导电环或导电碳刷来形成导电旁路。但当前所采用的方案存在的问题是，电机端轴承和减速器端轴承的高频环路电流较大，减速器端轴承产生的高频环路电压较高，仍然存在轴承电腐蚀现象。
发明内容
本申请的主要目的在于：提供一种电驱动***及电动车，旨在解决现有技术中电驱动***的电机存在轴承电腐蚀现象的技术问题。
为实现上述目的，本申请采用如下技术方案：
第一方面，本申请提供了一种电驱动***，包括：
电机，包括电机壳体，设于所述电机壳体内的轴承和转轴；
轴承电腐蚀抑制装置，包括串联的电容模块和第一电阻模块；
其中，所述轴承电腐蚀抑制装置的输入端与所述转轴电连接，所述轴承电腐蚀抑制装置的输出端接地。
在一实施例中，上述电驱动***中，所述轴承电腐蚀抑制装置还包括：
电抗模块，所述电抗模块的输入端与所述第一电阻模块连接，所述电抗模块的输出端接地。
在一实施例中，上述电驱动***中，所述轴承电腐蚀抑制装置还包括：
第二电阻模块，所述第二电阻模块与所述串联的电容模块和第一电阻模块并联，或所述第二电阻模块与串联连接的电容模块、第一电阻模块和电抗模块并联。
在一实施例中，上述电驱动***中，所述电容模块包括若干个电连接的电容，所述第一电阻模块包括若干个电连接的电阻，所述电抗模块包括若干个电连接的磁珠和/或若干个电连接的电感，所述第二电阻模块包括若干个电连接的电阻。
在一实施例中，上述电驱动***中，所述电驱动***还包括：
与所述电机电连接的电机控制器及减速器；
其中，所述轴承电腐蚀抑制装置设置于所述电机、所述电机控制器或所述减速器。
在一实施例中，上述电驱动***中，所述电驱动***还包括：
绝缘件；
其中，所述轴承设置在所述电机壳体内，所述轴承套设在所述转轴的外侧，所述绝缘件设置在所述轴承与所述电机的端盖之间。
在一实施例中，上述电驱动***中，所述轴承电腐蚀抑制装置的输入端通过导电旁路 零件与所述转轴电连接。
在一实施例中，上述电驱动***中，所述电驱动***还包括：
与所述电机电连接的减速器，所述减速器包括减速器轴，所述减速器轴与所述转轴连接；
其中，所述轴承电腐蚀抑制装置的输入端通过导电旁路零件与所述减速器轴电连接。
在一实施例中，上述电驱动***中，所述电驱动***还包括：
与所述电机电连接的电机控制器；
其中，所述轴承电腐蚀抑制装置的输出端与所述电机壳体电连接，所述电机壳体接地；或
所述轴承电腐蚀抑制装置的输出端与所述电机控制器的壳体电连接，所述电机控制器的壳体接地。
第二方面，本申请提供了一种电动车，包括：
电池；及
如上述的电驱动***；
其中，所述电池用于向所述电驱动***提供电能。
本申请提供的上述一个或多个技术方案，可以具有如下优点或至少实现了如下技术效果：
本申请提出的一种电驱动***及电动车，电驱动***包括电机和轴承电腐蚀抑制装置，电机的转轴通过轴承电腐蚀抑制装置接地，采用由电容模块和第一电阻模块串联构成的轴承电腐蚀抑制装置，可以降低轴承内外圈的共模电压，避免内外圈电压过高时击穿油膜产生EDM放电，具有抑制轴承电腐蚀的效果；同时，串联的电容模块和第一电阻模块，可以抑制高频环路电流，避免轴电流对轴承的影响，具有延长轴承使用寿命的效果。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的这些附图获得其他的附图。
图1为现有技术中电驱动***的共模等效电路；
图2为本申请电驱动***第一实施例的等效电路图；
图3为本申请电驱动***第二实施例的等效电路图；
图4为本申请电驱动***第三实施例的等效电路图；
图5为本申请电驱动***第三实施例中轴承电腐蚀抑制装置的一种等效电路图；
图6为本申请电驱动***第四实施例的等效电路图；
图7为本申请电驱动***第四实施例中轴承电腐蚀抑制装置的一种等效电路图；
图8为本申请电驱动***第五实施例中轴承电腐蚀抑制装置的结构示意图；
图9为本申请电驱动***第五实施例的结构示意图；
图10为本申请电驱动***第六实施例中轴承电腐蚀抑制装置的一种位置示意图；
图11为本申请电驱动***第六实施例中轴承电腐蚀抑制装置的另一位置示意图；
图12为本申请电驱动***第七实施例中轴承电腐蚀抑制装置的一种位置示意图；
图13为本申请电驱动***第七实施例中轴承电腐蚀抑制装置的另一位置示意图。
附图标号说明：

本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例只是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明，在本申请实施例中，所有方向性指示(诸如上、下、左、右、前、后……)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变，则该方向性指示也相应地随之改变。在本申请中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者***不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者***所固有的要素。在没有更多限制的情况下，由语句“包括……”限定的要素，并不排除在包括该要素的过程、方法、物品或者***中还存在另外的相同要素。在本申请中，除非另有明确的规定和限定，术语“连接”、“固定”等应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连；可以是两个元件内部的连通，也可以是两个元件的相互作用关系。在本申请中，若有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请中，使用用于表示元件的诸如“模块”、“部件”或“单元”的后缀仅为了有利于本申请的说明，其本身没有特定的意义。因此，“模块”、“部件”或“单元”可以混合地使用。
对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。另外，各个实施例的技术方案可以相互结合，但是，是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时，应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
新能源汽车的电驱动***至少包括驱动电机和电机控制器。在电驱动***运行过程中，电机控制器输出的PWM信号波会在直流母线中点与驱动电机的三相绕组中点之间产生共模电压；同时，由于电机控制器中开关器件的快速开关特性，产生高dv/dt值，该dv/dt值和定子绕组与机壳间的耦合电容共同引起了高频共模电流，该高频共模电流在铁芯内激发出环形共模磁通，并在转轴感应出轴电压，产生高频环路电流。在共模电压和高频环路电流的共同作用下，电机端的轴承、减速器非驱动端的轴承、减速器驱动端的轴承都容易发生损伤。
由于电驱动***中寄生电容的分压作用，共模电压会引起轴承内圈与外圈之间的电压降。当共模轴电压超过轴承油膜临界电压时，油膜被击穿，出现EDM放电现象，使轴承内外圈及滚珠表面发生烧蚀而出现斑点，长时间频繁EDM放电，会使轴承内外圈及滚珠表面出现明显搓板纹，即轴承电腐蚀，令电机产生震动与噪声，影响电机运转。
在相关技术中，为了避免轴承发生电腐蚀，会对驱动电机设置导电环或导电碳刷来形成导电旁路，一般有以下方案：
1.在电机端设置绝缘轴承，同时减速器驱动端单端导电；
2.分别在减速器非驱动端和减速器驱动端设置绝缘轴承，同时电机端单端导电；
3.分别在电机端和减速器非驱动端设置绝缘轴承，同时电机端单端导电。
上述方案主要针对400V高压硅(Si)产品的轴承电蚀抑制。随着碳化硅(SiC)技术的发展应用，dv/dt值会变得更高，产生的高频环路电流也会随之变得更大。上述方案存在的问题是，电机端轴承和减速器端轴承的高频环路电流较大，减速器端轴承产生的高频环 路电压较高，仍然存在轴承电腐蚀现象。而且，其中实现单端导电的导电环密封性难以保证，还会影响导电效果。另外，相关技术中目前还未有针对800V碳化硅(SiC)产品的轴承电蚀抑制的有效方案。
鉴于现有技术中电机存在轴承电腐蚀现象，而当前技术无法有效抑制轴承电腐蚀的技术问题，本申请提供了一种电驱动***及电动车。下面结合附图，通过具体的实施例和实施方式对本申请提供的电驱动***进行详细说明。
实施例一
参照图2，提出本申请电驱动***的第一实施例，该电驱动***可以包括电机和轴承电腐蚀抑制装置。
电机可以包括电机壳体，设于电机壳体内的轴承以及转轴，轴承的内圈与转轴连接，轴承的外圈与电机壳体连接。电机还可以包括转子以及定子，定子具有定子铁芯以及定子绕组等零部件，此外，电机还可以包括例如花键以及位置传感器等零部件，电机结构为本领域已知的技术方案，在此不再赘述。
如图1所示为现有技术中电驱动***的共模等效电路，具体的，在电机的轴承上有寄生电容Cb，定子铁芯与转子之间具有耦合电容Csr，定子绕组与转子之间具有耦合电容Cwr，定子绕组与定子之间具有耦合电容Cwf，减速器侧轴承与花键之间具有寄生电容Cg。
在电机控制器中开关器件快速开关时刻，产生的高dv/dt值和耦合电容共同引起了高频共模电流，该高频共模电流在铁芯内激发出环形共模磁通，并在转轴感应出共模轴电压，产生高频环路电流。
针对电机轴承电腐蚀问题，根据共模轴电压与高频环路电流产生的原理，本实施例提出了一种包括轴承电腐蚀抑制装置的电驱动***。该轴承电腐蚀抑制装置的输入端与电驱动***中电机的转轴电连接，该轴承电腐蚀抑制装置的输出端接地，该轴承电腐蚀抑制装置可以与电机中的轴承并联，具体可以与轴承的寄生电容Cb并联；
该轴承电腐蚀抑制装置用于抑制轴承上产生的高频环路电流，该轴承电腐蚀抑制装置可以包括：
串联的电容模块和第一电阻模块。
该实施例的电驱动***中，轴承电腐蚀抑制装置的输入端与电机的转轴电连接，输出端接地，即电机的转轴通过该轴承电腐蚀抑制装置实现接地。具体为，电容模块的输入端与电机的转轴电连接，电容模块的输出端与第一电阻模块的输入端连接，第一电阻模块的输出端作为轴承电腐蚀抑制装置的输出端接地。
在本实施例提供的电驱动***中应用该轴承电腐蚀抑制装置后，电驱动***的等效电路图如图2所示，串联的电容模块和第一电阻模块构成了该轴承电腐蚀抑制装置。需要说明，电容模块可以由一个电容实现，或多个电容进行串联和/或并联实现，第一电阻模块可以由一个电阻实现，或多个电阻进行串联和/或并联实现，例如本实施例中电容模块由一个电容Cd实现，第一电阻模块由一个电阻Rd实现，通过串联的电容Cd和电阻Rd构成了该轴承电腐蚀抑制装置。具体应用中可以根据实际需要选择，此处不作限定。
如图2所示，串联的电容Cd和电阻Rd与轴承的寄生电容Cb并联，对轴承内外圈电压进行分压，降低轴承内外圈的共模电压，避免了内外圈电压过高时击穿油膜产生EDM放电从而对轴承造成电腐蚀。
根据下述公式，公式一：
Vb＝KfBrVcom
其中，Vb表示轴承内外圈的共模电压，Br表示分压比，Vcom表示转轴上的共模轴电压；
公式二：
结合图1和图2，由于串联的电容Cd和电阻Rd与轴承的寄生电容Cb并联，可以将公式二中的分子和分母中的变为此时，分压比Br随电容Cd的增大而减小，对应的轴承内外圈的共模电压Vb也变小。
本实施例中，轴承电腐蚀抑制装置的电容Cd与电机的轴承并联，可以对轴承的内圈与外圈之间的电压进行分压，调节分压比，使轴承内外圈的共模电压Vb减小，避免内外圈电压过高时击穿油膜产生EDM放电从而对轴承造成电腐蚀；电阻Rd与电容Cd串联，可以降低环路电流，避免差模电压对轴承的影响。在电驱动***中，轴承电腐蚀抑制装置中的电容模块和第一电阻模块串联，还可以避免充放电时瞬时高频波导致的EMI超标而产生的电磁干扰。
本实施例提供的电驱动***，使电机的转轴通过轴承电腐蚀抑制装置接地，由电容模块和第一电阻模块串联构成的轴承电腐蚀抑制装置，可以降低轴承内外圈的共模电压，避免内外圈电压过高时击穿油膜产生EDM放电，具有抑制轴承电腐蚀的效果；同时，串联的电容模块和第一电阻模块，可以抑制高频环路电流，避免轴电流对轴承的影响，具有延长轴承使用寿命的效果。
实施例二
基于同一发明构思，参照图3，在实施例一的基础上，提出本申请电驱动***的第二实施例。
进一步地，该电驱动***中，轴承电腐蚀抑制装置还可以包括：
电抗模块，该电抗模块的输入端与第一电阻模块连接，输出端接地。
也就是说，本实施例中轴承电腐蚀抑制装置为串联的电容模块、第一电阻模块和电抗模块。
具体实施方式中，轴承电腐蚀抑制装置的输入端与电机的转轴电连接，输出端接地，即电容模块的输入端与电机的转轴电连接，电容模块的输出端通过第一电阻模块与电抗模块的输入端连接，电抗模块的输出端作为轴承电腐蚀抑制装置的输出端接地。
在本实施例提供的电驱动***中应用该轴承电腐蚀抑制装置后，电驱动***的等效电路图如图3所示，串联的电容模块、第一电阻模块和电抗模块构成了该轴承电腐蚀抑制装置。需要说明，电抗模块可以包括电感和/或磁珠，电抗模块可以由一个电感实现，或多个电感进行串联和/或并联实现，也可以由一个磁珠实现，或多个磁珠进行串联和/或并联实现，此外，电抗模块还可以是由一个或多个的电感，以及一个或多个的磁珠，由电感及磁珠进行串联和/或并联实现的。例如本实施例中电抗模块由一个磁珠FBd实现，通过串联的电容Cd、电阻Rd和磁珠FBd构成了该轴承电腐蚀抑制装置。具体应用中可以根据实际需要选择，此处不作限定。
如图3所示，串联的电容Cd、电阻Rd和磁珠FBd与轴承的寄生电容Cb并联，对轴承内外圈电压进行分压，可以避免内外圈电压过高时击穿油膜产生EDM放电从而对轴承造成电腐蚀；磁珠FBd与电阻Rd和电容Cd串联，可以利用磁珠低频低阻、高频高阻的特性，有效降低高频环路电流，同时也不影响低频时轴承内外圈共模电压Vb的增大，避免了高频时差模电压对轴承的影响。
本实施例提供的电驱动***，相比实施例一提供的电驱动***，不仅具有上述实施例一提供的电驱动***的有益效果，另外，还通过电抗模块的高频高阻抗特性，有效降低高频环路电流的同时，使得电驱动***可以应对碳化硅开关器件高dv/dt值特性下产生更大的高频环路电流所带来的影响。
实施例三
基于同一发明构思，参照图4，在实施例一的基础上，提出本申请电驱动***的第三实施例。
为了进一步释放电机转轴对地的电荷，该电驱动***中，轴承电腐蚀抑制装置还可以包括：
第二电阻模块，第二电阻模块与串联连接的电容模块和第一电阻模块并联。
也就是说，本实施例中轴承电腐蚀抑制装置具有两路，一路为串联的电容模块和第一电阻模块，另一路为单独的一个第二电阻模块。
具体实施方式中，轴承电腐蚀抑制装置的输入端与电机的转轴电连接，输出端接地，即电容模块的输入端和第二电阻模块输入端均与电机的转轴电连接，电容模块的输出端与第一电阻模块的输入端连接，第一电阻模块的输出端和第二电阻模块的输出端并接，作为轴承电腐蚀抑制装置的输出端接地。
在本实施例提供的电驱动***中应用该轴承电腐蚀抑制装置后，电驱动***的等效电路图如图4所示，第二电阻模块与串联的电容模块和第一电阻模块并联后，构成了该轴承电腐蚀抑制装置。
本实施例中，通过第二电阻模块与串联的电容模块和第一电阻模块并联，可以进一步释放电机转轴对地的电荷，辅助降低轴电压。
具体的，电容模块可以由一个电容实现，或多个电容进行串联和/或并联实现，第一电阻模块可以由一个电阻实现，或多个电阻进行串联和/或并联实现，第二电阻模块也可以由一个电阻实现，或多个电阻进行串联和/或并联实现，具体应用中，各电子器件的数量可以根据实际需要调整，此处不作限定。
例如，本实施例中电容模块采用一个电容Cd，第一电阻模块采用一个电阻Rd，第二电阻模块采用一个电阻Re，如图4所示，通过电阻Re与串联的电容Cd和电阻Rd并联，构成了本实施例中电驱动***的轴承电腐蚀抑制装置。
在一实施例中，电容模块可以包括若干个电连接的电容，第一电阻模块可以包括若干个电连接的电阻，第二电阻模块可以包括若干个电连接的电阻。
其中，上述的电连接可以包括串联和/或并联，具体为，包括但不限于若干个电子器件串联、若干个电子器件并联、若干个电子器件组串联或若干个电子器件组并联，其中，电子器件组为若干个串联的电子器件或若干个并联的电子器件，具体可根据实际情况设置，此处不作限定。
通过上述设置，可以对电容模块的容值大小或者第一电阻模块、第二电阻模块的阻值大小进行自由调整，以满足不同型号的产品需求，提高了广泛适应性。同时，可以根据实际需要选择电连接方式，根据实际需要设置电子器件数量以及根据实际需要调节器件参数，以便于该轴承电腐蚀抑制装置达到最佳的抑制效果。
一种实施方式中，如图5所示为本实施例中轴承电腐蚀抑制装置的一种等效电路图，一个电阻Re为轴承电腐蚀抑制装置中的第二电阻模块，一个电阻Rd为第一电阻模块，电容模块Cd可以由并联的电容C1以及电容C2构成。该电阻Re、电阻Rd、电容C1和电容C2构成的电路，一侧可以接转轴，另一侧可以接电机外壳，实现接地。
本实施例中，由电阻Rd、电容C1和电容C2构成的一路电路，可以用于抑制作用在轴承内外圈的共模电压，并降低差模电压波动幅值，其中，通过并联的两个电容C1和电容C2，可以调节差模电压的相位和幅值，辅助降低轴电压；而由电阻Re构成的另一路电路，则可以实现电机转轴对地的电荷释放。
本实施例提供的电驱动***，相比实施例一提供的电驱动***，不仅具有上述实施例一提供的电驱动***的有益效果，另外，还可以释放共模电荷，并降低充放电时高频波带来的电磁干扰。同时，通过多个电容串联/并联来构成电容模块，多个电阻串联/并联来构成第一电阻模块和第二电阻模块，可以对电容模块的容值大小以及第一电阻模块、第二电阻模块的阻值大小进行自由调整，具有更高的适用性，使得轴承电腐蚀抑制装置可以达到最佳的抑制效果。
实施例四
基于同一发明构思，参照图6，在实施例二的基础上，提出本申请电驱动***的第四实施例。
为了进一步释放电机转轴对地的电荷，该电驱动***中轴承电腐蚀抑制装置还可以包括：
第二电阻模块，第二电阻模块与串联连接的电容模块、第一电阻模块和电抗模块并联。
也就是说，本实施例中轴承电腐蚀抑制装置具有两路，一路为串联的电容模块、第一电阻模块和电抗模块，另一路为单独的一个第二电阻模块。
具体实施方式中，轴承电腐蚀抑制装置的输入端与电机的转轴电连接，输出端接地，即电容模块的输入端和第二电阻模块输入端均与电机的转轴电连接，电容模块的输出端通过第一电阻模块与电抗模块的输入端连接，电抗模块的输出端和第二电阻模块的输出端并接，作为轴承电腐蚀抑制装置的输出端接地。
在本实施例提供的电驱动***中应用该轴承电腐蚀抑制装置后，电驱动***的等效电路图如图6所示，第二电阻模块与串联的电容模块、第一电阻模块和电抗模块并联后，构成了该轴承电腐蚀抑制装置。
本实施例中，通过第二电阻模块与串联的电容模块、第一电阻模块和电抗模块并联，可以进一步释放电机转轴对地的电荷，辅助降低轴电压。
具体的，电容模块可以由一个电容实现，或多个电容进行串联和/或并联实现，第一电阻模块可以由一个电阻实现，或多个电阻进行串联和/或并联实现，第二电阻模块也可以由一个电阻实现，或多个电阻进行串联或并联实现，电抗模块可以由一个电感实现，或多个电感进行串联和/或并联实现，电抗模块也可以由一个磁珠实现，或多个磁珠进行串联和/或并联实现，此外，电抗模块还可以是由一个或多个的电感，以及一个或多个的磁珠，由电感及磁珠进行串联和/或并联实现的。具体应用中，各电子器件的数量可以根据实际需要调整，此处不作限定。
例如，本实施例中电容模块采用一个电容Cd，第一电阻模块采用一个电阻Rd，电抗模块采用一个磁珠FBd，第二电阻模块采用一个电阻Re，如图6所示，通过电阻Re与串联的电容Cd、电阻Rd和磁珠FBd并联，构成了本实施例中电驱动***的轴承电腐蚀抑制装置。
在一实施例中，电容模块可以包括若干个电连接的电容，第一电阻模块可以包括若干个电连接的电阻，电抗模块可以包括若干个电连接的磁珠和/或若干个电连接的电感，第二电阻模块可以包括若干个电连接的电阻。
其中，上述的电连接可以包括串联和/或并联，具体为，包括但不限于若干个电子器件串联、若干个电子器件并联、若干个电子器件组串联或若干个电子器件组并联，其中，电子器件组为若干个串联的电子器件或若干个并联的电子器件，具体连接方式可根据实际情况设置，此处不作限定。
通过上述设置，可以对电容模块的容值大小、电抗模块的特性或者第一电阻模块、第二电阻模块的阻值大小进行自由调整，以满足不同型号的产品需求，提高了广泛适应性。同时，可以根据实际需要选择电连接方式，根据实际需要设置电子器件数量以及根据实际需要调节器件参数，以便于该轴承电腐蚀抑制装置达到最佳的抑制效果。
一种实施方式中，如图7所示为本实施例中轴承电腐蚀抑制装置的一种等效电路图，一个电阻Re为轴承电腐蚀抑制装置中的第二电阻模块，一个电阻Rd为第一电阻模块，一个磁珠FBd为轴承电腐蚀抑制装置中的电抗模块，电容模块Cd可以由并联的电容C1以及电容C2构成。该电阻Re、电阻Rd、磁珠FBd、电容C1和电容C2构成的电路，一侧可以接转轴，另一侧可以接电机外壳，实现接地。
本实施例中，由电阻Rd、磁珠FBd、电容C1和电容C2构成的一路电路，可以用于抑制作用在轴承内外圈的共模电压，并降低差模电压波动幅值，其中，通过并联的两个电容C1和电容C2，可以调节差模电压的相位和幅值，辅助降低轴电压；而由电阻Re构成的另一路电路，则可以实现电机转轴对地的电荷释放。
本实施例提供的电驱动***，相比实施例二提供的电驱动***，不仅具有上述实施例二提供的电驱动***所有的有益效果，另外，还可以释放共模电荷，并降低充放电时高频 波带来的电磁干扰。同时，通过多个电容串联/并联来构成电容模块，多个电感和/或磁珠进行串联/并联来构成电抗模块，多个电阻串联/并联来构成第一电阻模块和第二电阻模块，可以对电容模块的容值大小、电抗模块的特性以及第一电阻模块、第二电阻模块的阻值大小进行自由调整，具有更高的适用性，使得轴承电腐蚀抑制装置可以达到最佳的抑制效果。
实施例五
基于同一发明构思，参照图8，在实施例一至四任一实施例的基础上，提出本申请电驱动***的第五实施例。
进一步地，如图8所示为轴承电腐蚀抑制装置的结构示意图，电驱动***的轴承电腐蚀抑制装置还可以包括：
PCB板60(Printed Circuit Board，印制线路板)，电容模块、第一电阻模块、电抗模块和第二电阻模块均可以设置在PCB板60上。
具体的，电容模块、第一电阻模块、电抗模块和第二电阻模块，可以构成上述实施例一至四任一实施例所采用的不同电路结构，对应设置于电子器件模块10中。当轴承电腐蚀抑制装置包括电容模块和第一电阻模块时，电子器件模块10即电容模块和第一电阻模块，设置在PCB板60上；当轴承电腐蚀抑制装置包括电容模块、第一电阻模块和电抗模块时，电子器件模块10即电容模块、第一电阻模块和电抗模块，设置在PCB板60上；当轴承电腐蚀抑制装置包括电容模块、第一电阻模块和第二电阻模块时，电子器件模块10即电容模块、第一电阻模块和第二电阻模块均设置在PCB板60上，或者，电容模块和第一电阻模块设置在PCB板60上，第二电阻模块设置在PCB板60以外的其他位置；当轴承电腐蚀抑制装置包括电容模块、第一电阻模块、电抗模块和第二电阻模块时，电子器件模块10即电容模块、第一电阻模块、电抗模块和第二电阻模块均设置在PCB板60上，或者，电容模块、第一电阻模块和电抗模块设置在PCB板60上，第二电阻模块设置在PCB板60以外的其他位置，具体应用中还可以根据实际需要设置。
进一步地，如图8所示，电驱动***的轴承电腐蚀抑制装置还可以包括：
支撑件90，支撑件90设置在PCB板60下方，PCB板60上设置有电连接固定孔61。
具体的，支撑件90可以是塑料材质制件，起到绝缘作用。导电旁路零件70可以通过螺钉穿过PCB板60上的电连接固定孔61固定在支撑件90上，以实现导电旁路零件70与轴承电腐蚀抑制装置中电子器件模块10内各器件的电连接。PCB板60还可以接地，比如，通过螺钉穿过PCB板60上的其他电连接固定孔61连接到电机的旋变盖板、壳体等。轴承电腐蚀抑制装置的输入端与电驱动***中电机的转轴30电连接后，转子电流可以经导电旁路零件70引至PCB板60上，电流再经过轴承电腐蚀抑制装置中的电子器件模块10后流至地端或壳体。
进一步地，如图9所示为本实施例中电驱动***的结构示意图，电驱动***还可以包括：
与电机电连接的电机控制器及减速器；
其中，轴承电腐蚀抑制装置可以设置于电机、电机控制器或减速器。
具体的，轴承电腐蚀抑制装置可以安装在电机的非驱动端，也可以安装在电机控制器或减速器中，还可以与位置传感器80导线集成以将电流引至电机控制器壳体。本实施例中，对轴承电腐蚀抑制装置的安装位置不作限定。
更进一步地，减速器可以包括减速器轴，减速器轴与转轴30连接。
在具体实施过程中，轴承电腐蚀抑制装置可以通过导电旁路零件70实现与转轴30的电连接，或者可以通过导电旁路零件70与减速器轴电连接，由于减速器轴与转轴30连接，此时该轴承电腐蚀抑制装置即通过减速器轴实现与转轴30的电连接。可选的，导电旁路零件70可以为导电碳刷、导电环、导电弹片、导电毛刷等中的任意一种。
本实施例中，轴承电腐蚀抑制装置的输入端可以通过导电旁路零件70与转轴30电连接或者通过导电旁路零件70与减速器轴电连接，而轴承电腐蚀抑制装置的输出端接地， 具体可以直接接地，或者通过电机的电机壳体实现接地，又或者通过减速器的减速器壳体实现接地，亦或者通过电机控制器的电机控制器壳体实现接地。其中，轴承电腐蚀抑制装置的输出端通过电机壳体实现接地，具体为直接与电驱动***中电机壳体电连接，电机壳体再接地；轴承电腐蚀抑制装置的输出端通过减速器壳体实现接地，具体为直接与电驱动***中减速器壳体电连接，减速器壳体再接地；轴承电腐蚀抑制装置的输出端通过电机控制器壳体实现接地，具体为直接与电驱动***中电机控制器壳体电连接，电机控制器壳体再接地。
进一步地，为了切断电驱动***中高频环路电流的电流路径，可以在非驱动端增加绝缘处理，避免电驱动***中驱动电机的轴承和减速器轴承受到轴电流的影响，进而可以延长轴承寿命。
在一实施例中，如图9所示，该电驱动***还可以包括：
绝缘件50，轴承40设置在电机壳体内，轴承40套设在转轴30的外侧，绝缘件50设置在轴承40与电机的端盖20之间。
具体的，绝缘件50的材料可以为高强度塑料。绝缘件50的形状可以是绝缘环，在电机轴承40的外部安装绝缘环，绝缘环内壁可以与轴承40外圈接触，绝缘环外壁可以与端盖20的内壁接触，绝缘环安装至轴承40与端盖20之间，隔绝轴承40与壳体。
如图8和图9所示，轴承电腐蚀抑制装置通过导电旁路零件70与电机的转轴30电连接，绝缘件50设置在轴承40与电机的端盖20之间，绝缘件50的内壁与轴承40的外壁抵接，绝缘件50的外壁则与电机端盖20内壁抵接。电机端盖20为电机壳体的一部分，利用绝缘件50可以隔绝轴承40和电机壳体，此时电驱动***的等效电路如图4或图6所示，加入绝缘件50后，绝缘件50的寄生电容Ca也会为轴承40分压，进一步提升了对轴电流的抑制效果。
在另一实施例中，电驱动***中电机的轴承40可以为绝缘轴承，端盖20可以为绝缘端盖。可以在轴承40表面涂覆绝缘涂层，从而使得轴承40外圈绝缘，也可以直接采用绝缘材料制作轴承40。同理，绝缘端盖也可以通过涂覆绝缘涂层或者采用绝缘材料直接制作。需要说明的是，电驱动***中可以同时采用绝缘轴承和绝缘端盖，也可以单独采用绝缘轴承或绝缘端盖；此外，在使用绝缘轴承或绝缘端盖的基础上，也可以在轴承40和端盖20之间增加绝缘件50。电机的端盖20为电机壳体的一部分。
在电驱动***中增加轴承腐蚀抑制装置和绝缘处理，还可以抑制高频轴电压，避免高频轴电压通过减速器轴系传导到半轴，从而可以避免半轴的天线效应造成的EMC(Electro Magnetic Compatibility，电磁兼容)问题。
本实施例提供的电驱动***，在采用实施例一至四任一实施例中的轴承电腐蚀抑制装置基础上，对轴承电腐蚀抑制装置的硬件结构进一步作出限定，不仅具有上述实施例的所有有益效果，还通过设置PCB板和支撑件，进一步保证了轴承电腐蚀抑制装置在电驱动***中的稳定安装，可以满足更多应用场景的需要；另外，还通过增加绝缘处理，可以进一步抑制高频轴电压，减少高频波带来的电磁干扰。
实施例六
基于同一发明构思，参照图10和图11，在实施例五的基础上，提出本申请电驱动***的第六实施例。在该电驱动***中，包括与电机电连接的电机控制器，轴承电腐蚀抑制装置安装在该电机控制器中。
进一步地，在该电驱动***中，轴承电腐蚀抑制装置的输入端可以通过导电旁路零件70直接与转轴30电连接。其中，导电旁路零件70可以为导电碳刷、导电环、导电弹片、导电毛刷等中的任意一种。
更进一步地，轴承电腐蚀抑制装置的输出端与电驱动***中的电机壳体电连接，电机壳体接地；或，
轴承电腐蚀抑制装置的输出端与电驱动***中的电机控制器壳体电连接，电机控制器 壳体接地。
在一种实施方式中，如图10所示为本实施例的电驱动***中轴承电腐蚀抑制装置的一种位置示意图，该轴承电腐蚀抑制装置安装在电机控制器中，采用如实施例一的电容模块和第一电阻模块即包括串联的电容Cd和电阻Rd，其PCB板60设置在电机控制器中。如图10所示，轴承电腐蚀抑制装置的输入端与电机的转轴30连接，输出端与电机控制器壳体电连接，电机控制器壳体接地，即通过电机控制器壳体实现接地。
另一种实施方式中，如图11所示为本实施例的电驱动***中轴承电腐蚀抑制装置的另一位置示意图，该轴承电腐蚀抑制装置安装在电机控制器中，采用如实施例二的电容模块、第一电阻模块和电抗模块即包括串联的电容Cd、电阻Rd和磁珠FBd，其PCB板60设置在电机控制器中。如图11所示，轴承电腐蚀抑制装置的输入端与电机的转轴30连接，输出端与电机控制器壳体电连接，电机控制器壳体接地，即通过电机控制器壳体实现接地。
可以理解，本实施例中安装在电机控制器中的轴承电腐蚀抑制装置可以是上述实施例一至四任一实施例中的轴承电腐蚀抑制装置，此处不再赘述。
本实施例提供的电驱动***中，直接在电机控制器中安装轴承电腐蚀抑制装置，该种安装方式中，由于电机控制器是电驱动***中对电机实现控制的必备器件，在其中设置轴承电腐蚀抑制装置，可以应用较多场景，满足实际需要，增大了该电驱动***尤其是其中轴承电腐蚀抑制装置的应用范围。
实施例七
基于同一发明构思，参照图12和图13，在实施例五的基础上，提出本申请电驱动***的第七实施例。在该电驱动***中，包括与电机电连接的减速器，轴承电腐蚀抑制装置安装在该减速器中，该减速器包括减速器轴，减速器轴与电机的转轴30连接。
进一步地，在该电驱动***中，轴承电腐蚀抑制装置的输入端可以通过导电旁路零件70与电驱动***中的减速器轴电连接，减速器轴与转轴30连接。其中，导电旁路零件70可以为导电碳刷、导电环、导电弹片、导电毛刷等中的任意一种。
由于减速器轴和电机的转轴30通过连接件连接，减速器轴、电机的转轴30、连接件为导电材料，因此轴承电腐蚀抑制装置与减速器轴电连接后，间接地与转轴30电连接。
更进一步地，轴承电腐蚀抑制装置的输出端与电驱动***中的电机壳体电连接，电机壳体接地；或，
轴承电腐蚀抑制装置的输出端与电驱动***中减速器的减速器壳体电连接，减速器壳体接地。
在一种实施方式中，如图12所示为本实施例的电驱动***中轴承电腐蚀抑制装置的一种位置示意图，该轴承电腐蚀抑制装置设置在电驱动***中的减速器侧，采用如实施例一的电容模块和第一电阻模块即包括串联的电容Cd和电阻Rd，其PCB板60设置在电机控制器中。如图12所示，轴承电腐蚀抑制装置的输入端与减速器轴电连接，减速器轴与电机的转轴30连接，轴承电腐蚀抑制装置的输出端与减速器壳体电连接，减速器壳体接地，即通过减速器壳体实现接地。
另一种实施方式中，如图13所示为本实施例的电驱动***中轴承电腐蚀抑制装置的另一位置示意图，该轴承电腐蚀抑制装置设置在电驱动***中的减速器侧，采用如实施例二的电容模块、第一电阻模块和电抗模块即包括串联的电容Cd、电阻Rd和磁珠FBd，其PCB板60设置在电机控制器中。如图13所示，轴承电腐蚀抑制装置的输入端与减速器轴电连接，减速器轴与电机的转轴30连接，轴承电腐蚀抑制装置的输出端与减速器壳体电连接，减速器壳体接地，即通过减速器壳体实现接地。
可以理解，本实施例中安装在减速器侧的轴承电腐蚀抑制装置可以是上述实施例一至四任一实施例中的轴承电腐蚀抑制装置，此处不再赘述。
本实施例提供的电驱动***中，在电驱动***中的减速器侧安装轴承电腐蚀抑制装置，该种安装方式可以进一步减小高频环路电流对减速器侧的轴承电腐蚀影响。
实施例八
基于同一发明构思，提出本申请电动车的一实施例。该电动车可以包括：
电池及电驱动***；
其中，电池用于向电驱动***提供电能，电驱动***的具体结构可以参照上述实施例一至七中的任一实施例。
具体的，电动车可以是电动汽车、电动自行车、电动三轮车等电驱动车辆。上述电池可以视为电源***，举例而言，其可以包括电源装置及电源管理电路等，由电源管理电路对电源装置输出的电压进行转换、滤波等处理后，提供给电驱动***，具体可以提供给电驱动***的电机，使电机运转，实现电驱动功能。可以理解，上述电源***内部装置及电源管理电路可实现的功能均可以根据实际需要设置，本实施例不作限制。
在上述过程中，为了避免EDM放电，在电机的轴承上并联设置一轴承电腐蚀抑制装置，电机的转轴通过该轴承电腐蚀抑制装置接地，通过轴承电腐蚀抑制装置来抑制轴承上产生的高频环路电流，从而达到抑制轴承电腐蚀的效果，延长轴承使用寿命。
需要说明，由于本实施例的电动车采用了上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。
需要说明，上述本申请实施例序号仅为了描述，不代表实施例的优劣。以上实施例仅为本申请的可选实施例，并非因此限制本申请的专利范围，凡是在本申请的发明构思下，利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均包括在本申请的专利保护范围内。

Claims (10)

  1. 一种电驱动***，其中，包括：
    电机，包括电机壳体，设于所述电机壳体内的轴承和转轴；
    轴承电腐蚀抑制装置，包括串联的电容模块和第一电阻模块；
    其中，所述轴承电腐蚀抑制装置的输入端与所述转轴电连接，所述轴承电腐蚀抑制装置的输出端接地。
  2. 如权利要求1所述的电驱动***，其中，所述轴承电腐蚀抑制装置还包括：
    电抗模块，所述电抗模块的输入端与所述第一电阻模块连接，所述电抗模块的输出端接地。
  3. 如权利要求2所述的电驱动***，其中，所述轴承电腐蚀抑制装置还包括：
    第二电阻模块，所述第二电阻模块与所述串联的电容模块和第一电阻模块并联，或所述第二电阻模块与串联连接的电容模块、第一电阻模块和电抗模块并联。
  4. 如权利要求3所述的电驱动***，其中，所述电容模块包括若干个电连接的电容，所述第一电阻模块包括若干个电连接的电阻，所述电抗模块包括若干个电连接的磁珠和/或若干个电连接的电感，所述第二电阻模块包括若干个电连接的电阻。
  5. 如权利要求1或2所述的电驱动***，其中，所述电驱动***还包括：
    与所述电机电连接的电机控制器及减速器；
    其中，所述轴承电腐蚀抑制装置设置于所述电机、所述电机控制器或所述减速器。
  6. 如权利要求1或2所述的电驱动***，其中，所述电驱动***还包括：
    绝缘件；
    其中，所述轴承设置在所述电机壳体内，所述轴承套设在所述转轴的外侧，所述绝缘件设置在所述轴承与所述电机的端盖之间。
  7. 如权利要求1或2所述的电驱动***，其中，所述轴承电腐蚀抑制装置的输入端通过导电旁路零件与所述转轴电连接。
  8. 如权利要求1或2所述的电驱动***，其中，所述电驱动***还包括：
    与所述电机电连接的减速器，所述减速器包括减速器轴，所述减速器轴与所述转轴连接；
    其中，所述轴承电腐蚀抑制装置的输入端通过导电旁路零件与所述减速器轴电连接。
  9. 如权利要求1或2所述的电驱动***，其中，所述电驱动***还包括：
    与所述电机电连接的电机控制器；
    其中，所述轴承电腐蚀抑制装置的输出端与所述电机壳体电连接，所述电机壳体接地；或
    所述轴承电腐蚀抑制装置的输出端与所述电机控制器的壳体电连接，所述电机控制器的壳体接地。
  10. 一种电动车，其中，包括：
    电池；及
    如权利要求1至9中任一所述的电驱动***；
    其中，所述电池用于向所述电驱动***提供电能。
PCT/CN2023/099748 2022-06-30 2023-06-12 电驱动***及电动车 WO2024001751A1 (zh)

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CN115085485A (zh) * 2022-06-30 2022-09-20 苏州汇川联合动力***有限公司 轴承电腐蚀抑制装置及电驱动***

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CN1531158A (zh) * 2003-02-07 2004-09-22 SKF�ɷݹ�˾ 用于保护电动机械的轴承不受有害的电流流过损伤的装置
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CN104638890A (zh) * 2015-01-29 2015-05-20 国家电网公司 一种谐波滤波装置及其滤除高频轴电流的方法
CN115085485A (zh) * 2022-06-30 2022-09-20 苏州汇川联合动力***有限公司 轴承电腐蚀抑制装置及电驱动***

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JPH1014159A (ja) * 1996-06-20 1998-01-16 Matsushita Seiko Co Ltd 送風機用軸受保護装置
CN1695065A (zh) * 2002-09-10 2005-11-09 阿尔斯托姆科技有限公司 检测电机中电刷打火和电火花腐蚀的方法与装置
CN1531158A (zh) * 2003-02-07 2004-09-22 SKF�ɷݹ�˾ 用于保护电动机械的轴承不受有害的电流流过损伤的装置
US7501784B2 (en) * 2004-04-05 2009-03-10 Siemens Aktiengesellschaft Compensation method and apparatus for preventing damaging bearing currents in an electrical machine
CN104638890A (zh) * 2015-01-29 2015-05-20 国家电网公司 一种谐波滤波装置及其滤除高频轴电流的方法
CN115085485A (zh) * 2022-06-30 2022-09-20 苏州汇川联合动力***有限公司 轴承电腐蚀抑制装置及电驱动***

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