CN109768757B - Multi-phase alternating current motor, inverter, electric drive module, and electric device - Google Patents
Multi-phase alternating current motor, inverter, electric drive module, and electric device Download PDFInfo
- Publication number
- CN109768757B CN109768757B CN201910186882.8A CN201910186882A CN109768757B CN 109768757 B CN109768757 B CN 109768757B CN 201910186882 A CN201910186882 A CN 201910186882A CN 109768757 B CN109768757 B CN 109768757B
- Authority
- CN
- China
- Prior art keywords
- inverter
- windings
- phase
- current
- motor
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
- Control Of Multiple Motors (AREA)
Abstract
The invention provides an electric drive assembly, an electric device, an inverter and a multi-phase alternating current motor, wherein the electric drive assembly comprises: a multiphase AC motor having a phase number k and a rated line voltage and a rated line current; a DC power supply for supplying a DC current corresponding to a rated line current; and an inverter for converting the direct current into an alternating current according to a control signal and supplying the alternating current to the multi-phase alternating current motor, wherein the multi-phase alternating current motor comprises m mutually independent multi-phase windings, each multi-phase winding comprises k mutually independent windings corresponding to the number of k phases, m in-phase windings in the m multi-phase windings are formed by m parallel windings, the inverter comprises m inverter units corresponding to the m multi-phase windings, each inverter unit comprises k mutually parallel connected bridge arm parts corresponding to the number of k phases and used for supplying k lines of current to the corresponding multi-phase windings, and each bridge arm part comprises w mutually parallel connected inverter bridge arms.
Description
Technical Field
The invention belongs to the field of alternating current motors, and particularly relates to a high-current multi-phase alternating current motor, an inverter, an electric drive assembly comprising the multi-phase alternating current motor and the inverter, and an electric device comprising the electric drive assembly.
Background
High power electric devices typically select an ac motor as the drive motor. When the motor starts, the inverter converts direct current into alternating current according to control signals sent by the controller and the trigger circuit and provides the alternating current for the alternating current motor.
For mobile electric devices such as locomotives, ships or boats, batteries are generally selected as the dc power source. For safety reasons, the voltage of the battery cannot be too high, and is generally less than 60 v, so that in order to meet the requirements of high-power motors and loads, the output current of the inverter must be very large, and the power switching element must also have a higher rated operating current.
However, power switching elements that can withstand the large operating currents required by high power motors are expensive or cannot be purchased or even exist, subject to various conditions. In order to realize that the inverter can smoothly provide alternating current for the high-power alternating current motor, two or more switching elements with low total price and relatively small rated working current which are easy to purchase are often selected to replace one high-current switching element, and the method is generally called parallel connection.
Fig. 2 is a schematic diagram of a connection relationship between a large-current three-phase ac motor and an inverter, which is common in the prior art, and as can be seen from fig. 2, the inverter employs a parallel current sharing technology, and line current of each phase of the ac motor is provided by j parallel in-phase inverter bridge arms. In principle, the value of the current flowing through the switching elements of each inverter leg is j times smaller than the line current of the ac motor, i.e. the j parallel low-current semiconductor switching elements share a line current of the motor.
Since a single low-current semiconductor switching element cannot bear the line current of a high-current motor, if a high current flows through a single low-current semiconductor switching element and exceeds the bearing capacity of the low-current switching element, the low-current switching element is inevitably damaged.
Under the condition that the consistency of the switching characteristics is high, the parallel semiconductor switching elements can be switched on and off simultaneously, so that the large current of each line of the motor is shared together during the switching-on period, and the current equalizing effect is good. However, such semiconductor switching elements are obtained by fine selection from a large number of switching elements, which results in high use cost, and the cost is increased sharply as more switching elements are connected in parallel. Furthermore, even if the consistency of the selected switching elements is high in the testing process before use, it is difficult to ensure that the consistency is still maintained in the using process under the influence of the using environment and the aging of the device.
Under the influence of various factors, when the switching elements are changed from an off state to an on state, if the parallel low-current switching elements cannot be simultaneously conducted, the current sharing fails, and then a single switching element which is conducted in advance flows a large motor line current, so that the switching elements are damaged; in the same way, when the switching elements are changed from the on state to the off state, if the parallel low-current switching elements cannot be turned off at the same time, the current sharing fails, and then the switching element which is turned off at last flows a large motor line current, so that the switching element is damaged.
With the increase of the parallel connection quantity of the switching elements, the consistency of the switching characteristics is more difficult to ensure, so that the current sharing effect is poorer, the damage possibility is higher, and the problem is more serious. The parallel current sharing technology cannot ensure that any plurality of parallel switching elements are simultaneously switched on and off, so that the increase of the current value of the large-current motor is seriously influenced and limited, and the large-current motor becomes an obstacle which is difficult to cross. Based on the current technology, 2 switching elements can be connected in parallel generally, and only a certain company abroad can connect 4-5 switching elements in parallel.
In order to solve the above problems, the inventors of the present invention have proposed a three-phase alternating-current motor and inverter structure shown in fig. 3. As can be seen from fig. 3, the large winding of the three-phase ac motor 21 is divided into j small windings 211 that are independently installed, based on the rated operating current of the semiconductor switching elements (221a, 221b) on the selected inverter 22, then each phase of the inverter arm of the inverter 22 is also divided into j small arms, and the k small arms of different phases are combined to form j small inverters 221 that are respectively connected to the j small windings in a one-to-one correspondence.
Each small inverter 221 independently supplies power to the small winding 211 connected to it, and the output current is 1/j of the rated line current of the motor, and the existing small-current semiconductor switching elements can completely bear any large current intensity as long as j is large enough.
However, the structure in fig. 3 also increases the number of output wire connectors of the inverter from three to 3j, and the number of connectors of the ac motor from three to 3j, which increases the complexity, difficulty and cost of tapping and installing outgoing lines in the production process, so that workers are very easy to connect the connectors incorrectly, resulting in the failure of the motor to operate normally; the output lines of the inverters are increased, so that the area of a circuit board is increased, and the cost is increased; in the later maintenance or repair process of the motor and the inverter, the joints are difficult to check one by one, and the failed joint is found out, so that the maintenance or repair difficulty is high. In addition, the large number of joints not only increases the investment of manufacturers in the joints, but also doubles the volume of the aluminum junction box outside the ac motor for accommodating the joints, resulting in a large ac motor, which increases the production cost of the motor and the inverter to some extent.
Disclosure of Invention
The present invention is made to solve the above problems by adopting a compromise method to improve the cost performance of the multiphase ac motor, the inverter and the electric drive component. In combination with the advantages of the inverter and the multi-phase ac motor shown in fig. 2 and 3, a new electric drive assembly is provided, which not only overcomes the defect that the low-voltage and high-current motor is difficult to realize due to poor consistency of the semiconductor switching elements, but also avoids the difficulty and cost of production and maintenance caused by excessive connection of the ac motor and the inverter shown in fig. 3.
In order to achieve the purpose, the invention adopts the following technical scheme:
< Structure one >
The invention provides an electric drive assembly, which is arranged in an electric device and is used for driving the electric device, and the electric drive assembly is characterized in that: the system comprises a multi-phase alternating current motor, a control circuit and a control circuit, wherein the multi-phase alternating current motor has a phase number of k and has a rated line voltage and a rated line current; a DC power supply having a power supply of a constant voltage corresponding to a rated line voltage for supplying a DC power corresponding to a rated line current; and the inverter converts the direct current into alternating current according to the control signal and provides the alternating current to the multi-phase alternating current motor. The multiphase alternating current motor is provided with m mutually independent multiphase windings, each multiphase winding is provided with k mutually independent windings corresponding to k phases respectively, m in-phase windings in the m multiphase windings are formed by m parallel winding, the inverter is provided with m inverter units corresponding to the m multiphase windings respectively, each inverter unit is provided with k mutually parallel connected bridge arm parts corresponding to the k phases respectively and used for providing k routes of current for the corresponding multiphase windings, each bridge arm part comprises w mutually parallel connected inverter bridge arms, k and m are positive integers more than 2, and w is a positive integer between 2 and 4.
The invention also provides an electric drive assembly having the technical features of: each inverter bridge arm comprises an upper bridge arm semiconductor switching element and a lower bridge arm semiconductor switching element which are connected in series with each other, and the upper bridge arm semiconductor switching element and the lower bridge arm semiconductor switching element have the same preset maximum output current. The electric drive assembly further comprises: and the controller is used for providing the control signal for the inverter according to a preset working period between the upper-arm semiconductor switching element and the lower-arm semiconductor element and according to a pulse signal corresponding to the conducting current of the upper-arm semiconductor switching element or the lower-arm semiconductor element in corresponding working time.
The invention provides an electric drive assembly which may also have the following features: when the maximum output current of the upper arm semiconductor switching element and the lower arm semiconductor switching element is I 1 Rated line current of the polyphase AC motor is I N The number m of the multi-phase windings satisfies the following condition:
m＞1.2(I N ÷wI 1 )
the invention provides an electric drive assembly which may also have the following features: each bridge arm part comprises two inverter bridge arms which are connected in parallel, and the preset maximum output current of the semiconductor switching elements of the upper bridge arm and the semiconductor switching elements of the lower bridge arm is 0.6-0.8 times of the output current of the bridge arm parts.
The invention also provides an electric drive assembly having the following features: the direct current power supply is obtained by rectifying and filtering a battery or an alternating current power supply, k is more than or equal to three, and the number of phases of the multi-phase winding is equal to k. The multiphase windings are connected in a star shape, and the bridge arm parts with the number equal to the number of the phases of the multiphase windings are respectively connected with a plurality of end points of the corresponding multiphase windings so as to provide line current.
The invention provides an electric drive assembly which may also have the following features: k is equal to three, the multi-phase winding is a three-phase winding which is connected in a triangular shape, and three bridge arm parts are respectively connected with three head-tail connection points of the corresponding three-phase winding, so that line current is provided.
The invention also provides an electric drive assembly having the following features: the polyphase windings are independently mounted on an armature or armatures, which are the stator or rotor of a polyphase ac motor. The multiphase alternating current motor is any one of an asynchronous motor and a synchronous motor. The semiconductor switch element is a fully-controlled device, and the fully-controlled device is any one of an electric field effect transistor, a gate turn-off thyristor, an integrated gate commutated thyristor, an insulated gate bipolar transistor and an electric power bipolar transistor.
< Structure two >
Further, the present invention provides an inverter connected to a multiphase ac motor having a rated line voltage and a rated line current for k phases and having m mutually independent multiphase windings and a dc power supply having a constant voltage and supplying a dc power corresponding to the rated line current, respectively, for converting the dc power into an ac power according to a control signal and supplying the ac power to the multiphase ac motor, having technical features of: m inverter units corresponding to the m multiphase windings, respectively. Each multi-phase winding is provided with k independent windings corresponding to k phases respectively, m windings in the same phase in the m multi-phase windings are formed by m parallel windings, each inversion unit is provided with k bridge arm parts which correspond to the k phases respectively and are connected in parallel mutually and used for providing k routes of current for the corresponding multi-phase windings, each bridge arm part comprises w inversion bridge arms connected in parallel mutually, k and m are positive integers more than 2, and w is a positive integer between 2 and 4.
< Structure III >
Further, the present invention provides a multiphase ac motor having a rated line voltage and a rated line current for k phases, connected to an inverter having m inverter units and converting a dc power from a dc power supply having a constant voltage into an ac power through the m inverter units according to a control signal, each inverter unit having k bridge sections connected in parallel to each other corresponding to the number of the k phases, each bridge section including two to four inverter bridge arms connected in parallel to each other, characterized by comprising: m mutually independent multi-phase windings, wherein the m multi-phase windings respectively correspond to the m inverter units, each multi-phase winding is provided with k mutually independent windings corresponding to the k phases, the m windings with the same phase in the m multi-phase windings are formed by m parallel windings, each multi-phase winding receives k lines of current provided by k bridge arm parts in the corresponding inverter unit, and k and m are both positive integers more than 2.
< Structure four >
Furthermore, the invention also provides an electric device comprising the electric drive assembly.
Action and Effect of the invention
According to the electric drive assembly, the electric device, the inverter and the multi-phase alternating current motor provided by the invention, on one hand, the multi-phase alternating current motor is provided with m mutually independent multi-phase windings, each multi-phase winding is provided with k mutually independent windings corresponding to k phases respectively, the inverter is provided with m inverter units corresponding to m multi-phase windings respectively, each inverter unit is provided with k mutually parallel connected bridge arm parts corresponding to k phases respectively for providing k routes of current for the corresponding multi-phase windings, so that each multi-phase winding is driven by the corresponding inverter unit independently, two adjacent multi-phase windings are not interfered with each other, further the alternating current of the multi-phase motor can be increased arbitrarily according to needs, and not only the mature control algorithm of the original inverter, the mature technology of the alternating current motor and the mature technology of connecting a few switching elements in parallel are reserved, and the requirement for the consistency of the performances of a plurality of semiconductor switching elements is reduced, the requirement can be met by using common semiconductor switching elements, and the consumption of a large amount of manpower and financial resources caused by precisely selecting a plurality of switching elements with high consistency from a large amount of semiconductor switching elements is avoided. Furthermore, since m windings of the m multiphase windings in the same phase are formed by m parallel windings, the invention can realize m mutually independent multiphase windings without changing the armature structure of the multiphase alternating current motor, and the multiphase alternating current motor does not need to be redesigned and manufactured, thereby greatly reducing the production cost of the electric drive assembly.
On the other hand, because each bridge arm part comprises w (w is 2, 3 or 4) inverter bridge arms which are connected in parallel, under the condition that the rated line current of the motor is constant, compared with the bridge arm part only comprising one inverter bridge arm, the structure can increase the output current of each bridge arm part to a certain extent, and further can correspondingly reduce the number j of multi-phase windings in the multi-phase alternating current motor, thereby not only reducing the number of joints of the inverter and the multi-phase alternating current motor and lightening the maintenance and maintenance difficulty, but also reducing the production cost of the multi-phase alternating current motor and the inverter.
Drawings
FIG. 1 is a schematic diagram of an electrical circuit configuration of an electrical drive assembly according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a high current multiphase AC motor and inverter of the prior art;
fig. 3 is a schematic circuit diagram of a high-current multiphase ac motor and inverter modified from fig. 2 in the prior art.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic circuit diagram of an electric drive module in the present embodiment.
The electric drive assembly 10 is provided in an electric device such as an electric tool, a quadcopter, an electric automobile, an electric ship, an industrial electric forklift, and an electric military device, and is used for driving the electric device. As shown in fig. 1, the electric drive assembly 10 includes a dc power source, an inverter 12, a multi-phase ac motor 13, a controller 14, and a trigger circuit 15.
The dc power supply provides dc power to the inverter 12; the inverter 12 converts the direct current into an alternating current according to a control signal from the controller 14 through the trigger circuit 15 and supplies the alternating current to the multiphase ac motor 13. In this embodiment, the dc power source is a battery or a dc power source obtained by rectifying and filtering an ac power source, and for electric devices such as locomotives, ships, naval vessels, and aircrafts, a battery is often used.
The multiphase ac motor 13 has m mutually independent multiphase windings 131 independently mounted on an armature or armatures, each multiphase winding 131 being k-phase. In the present embodiment, k is three, that is, the multiphase ac motor 13 is a three-phase ac motor, and accordingly, the multiphase windings 131 are three-phase windings each having three delta-connected windings A, B, C. In the present embodiment, the armature is a stator or a rotor of a multiphase ac motor, and the multiphase ac motor is any one of an asynchronous motor and a synchronous motor.
DC terminal voltage of inverter 12 is U dc The inverter comprises m inverter units 121 corresponding to m multi-phase windings respectively, and each inverter unit 121 comprises three A-phase bridge arm parts, B-phase bridge arm parts and C-phase bridge arm parts which are connected in parallel and have the same structure.
The A-phase bridge arm part and the A-phase winding are connected with a joint AC of the C-phase winding, the B-phase bridge arm part and the B-phase winding are connected with a joint BA of the A-phase winding, and the C-phase bridge arm part and the C-phase winding are connected with a joint CB of the B-phase winding, and respectively provide line current for the windings of corresponding phases.
Each bridge arm part is provided with two inverter bridge arms which are connected in parallel, namely, the A-phase bridge arm part is composed of two A-phase inverter bridge arms, the B-phase bridge arm part is composed of two B-phase inverter bridge arms, and the C-phase bridge arm part is composed of two C-phase inverter bridge arms.
Each inverter arm includes an upper arm semiconductor switching element 121a and a lower arm semiconductor switching element 121b connected in series with each other. Therefore, each of the three-phase windings 131 is individually driven by the inverter unit 121 composed of twelve semiconductor switching elements.
The upper arm semiconductor switching element 121a and the lower arm semiconductor switching element 121b have the same predetermined maximum output current. The maximum output current, also called the maximum continuous operating current, or the rated operating current, is an important parameter of the semiconductor switching element, and the semiconductor switching element can operate stably only at a current value below the maximum continuous operating current, and if the operating current exceeds the maximum continuous operating current, the semiconductor switching element is broken down due to overcurrent, thereby being damaged.
In this embodiment, the semiconductor switching element is a fully-controlled device, and the fully-controlled device is any one of a power field effect transistor, a gate turn-off thyristor, an integrated gate commutated thyristor, an insulated gate bipolar transistor, and a power bipolar transistor.
In the present embodiment, since the upper arm part of each arm part is composed of two upper arm semiconductor switching elements 221a connected in parallel, and the lower arm part is composed of two lower arm semiconductor switching elements 221b connected in parallel, the maximum output current flowing through the upper arm part and the lower arm part is greater than the current of each arm part (including only one inverter arm) in fig. 3, and is generally 1.2 to 1.6 times the current in fig. 3.
Therefore, for the same type of three-phase alternating current motor, the number m of the three-phase windings in the embodiment is about 3/5-4/5 of the number j of the three-phase windings in fig. 3. Of course, m should be a positive integer, which can be rounded up on the basis of 3/5 j-4/5 j.
The controller 14 supplies a signal to the trigger circuit 15 based on a predetermined duty cycle between the upper arm semiconductor switching element 121a and the lower arm semiconductor element 121b and based on a pulse signal corresponding to an on current of the upper arm semiconductor switching element 121a or the lower arm semiconductor element 121b in a corresponding operating time.
The trigger circuit 15 includes an a-phase trigger circuit, a B-phase trigger circuit, and a C-phase trigger circuit, and the three-phase trigger circuit provides trigger signals to the upper arm semiconductor switching element 121a and the lower arm semiconductor switching element 121B on the a-phase inverter bridge arm, the B-phase inverter bridge arm, and the C-phase inverter bridge arm, respectively, to turn on or off the same.
The number m of the multi-phase windings in this embodiment is an integer, and satisfies the following condition: m > 1.2 (I) N ÷2I 1 ) In the formula I 1 The maximum output current of a single bridge arm; i is N Is the rated line current of the multiphase AC motor.
In the same way as the number of the multi-phase windings is determined in fig. 3, when m is determined, firstly, a proper semiconductor switching element is selected, the continuous working current value of the single element of the semiconductor switching element is determined (considering the influence of various factors, the continuous working current value is smaller than the rated working current), and then m is obtained by calculating and rounding up according to the above formula.
When the motor winding group is split into m multi-phase windings connected in parallel, if the winding group is not parallel-wound or is difficult to split directly, the windings can be redesigned by using an equivalent principle, and the parallel winding number of the windings is determined as m or integral multiple of m.
Of course, it may not be according to I 1 M is determined according to the rated line current I of the three-phase AC motor N Determining m to obtain input current I of each three-phase winding N And/m, and then selecting a suitable semiconductor switching element.
In the present embodiment, the rule of selecting an appropriate semiconductor switching element is as follows: the semiconductor switching elements are selected such that the maximum operating current of each bridge limb portion is 1.2 to 1.6 times the line current of the corresponding three-phase winding. For example, if the line current of the three-phase winding (i.e., the output current of the arm sections) is 200A, then the maximum output current of each arm section should be 240A to 320A, and since each arm section is composed of two inverter arm sections, the maximum output current of the semiconductor switching element on each inverter arm section should be 120A to 160A, i.e., the maximum output current of each semiconductor switching element should be 0.6 to 0.8 times the line current of the three-phase winding.
In the present embodiment, each of the bridge arm portions includes two inverter bridge arms connected in parallel with each other, which is a preferable configuration because the more inverter bridge arms connected in parallel, the higher the requirement for the uniformity of the semiconductor switching elements, and the higher the cost. Certainly, when the technology is mature and the semiconductor switching element is not easily damaged, each bridge arm portion may include more than two inverter bridge arms connected in parallel, but the number of the inverter bridge arms is at most four, and more than four inverter bridge arms make the selection of the semiconductor switching element very difficult and the cost is very high.
Effects and effects of the embodiments
According to the electric drive assembly, the electric device, the inverter and the multi-phase ac motor provided by the present embodiment, on one hand, since the multi-phase ac motor has m mutually independent multi-phase windings, each multi-phase winding has k mutually independent windings corresponding to k phases respectively, the inverter has m inverter units corresponding to m multi-phase windings respectively, each inverter unit has k mutually parallel connected bridge arm portions corresponding to k phases respectively for providing k routes of current to the corresponding multi-phase windings, so that each multi-phase winding is driven by the corresponding inverter unit independently, two adjacent multi-phase windings do not interfere with each other, and further the current of the multi-phase ac motor can be increased arbitrarily as required, not only the mature control algorithm of the original inverter, the mature technology of the ac motor and the mature technology of connecting a few switching elements in parallel are retained, moreover, the requirement on the consistency of the performances of the plurality of semiconductor switching elements is reduced, the requirement can be met by using common semiconductor switching elements, and the consumption of a large amount of manpower and financial resources caused by precisely selecting the plurality of switching elements with high consistency from a large amount of semiconductor switching elements is avoided. Furthermore, since m windings of the m multiphase windings in the same phase are formed by m parallel windings, the invention can realize m mutually independent multiphase windings without changing the armature structure of the multiphase alternating current motor, and the multiphase alternating current motor does not need to be redesigned and manufactured, thereby greatly reducing the production cost of the electric drive assembly.
On the other hand, because each bridge arm part comprises w (w is 2, 3 or 4) inverter bridge arms which are connected in parallel, under the condition that the rated line current of the motor is constant, compared with the bridge arm part only comprising one inverter bridge arm, the structure can increase the output current of each bridge arm part to a certain extent, and further can correspondingly reduce the number j of multi-phase windings in the multi-phase alternating current motor, thereby not only reducing the number of joints of the inverter and the multi-phase alternating current motor and lightening the maintenance and maintenance difficulty, but also properly reducing the production cost of the multi-phase alternating current motor and the inverter.
In another aspect, the electric drive module of the present embodiment may appropriately reduce a strong current coupling relationship existing in a parallel connection relationship of the plurality of switching elements of the inverter arm and a superposition relationship of output currents of the inverter arm, and may shift a partial coupling relationship to a composite relationship of m mutually independent multi-phase winding magnetomotive forces. The magnetomotive force can not cause the switch element to be overcurrent, thereby solving the bottleneck problem of a large-current motor, and theoretically, the motor can realize any required large current.
In the above embodiment, the three-phase windings are connected in a delta shape, and the three inverter bridge arms are respectively connected with three end-to-end joints of the corresponding three-phase windings, so as to provide line current. As an electric drive assembly of the present invention, the three-phase windings may also be star-connected, where three inverter legs are connected to three terminals of the corresponding three-phase windings, respectively, to provide line current.
In the above embodiments, the present invention has been explained in detail by taking a three-phase motor as an example, but as the electric drive component of the present invention, the multi-phase ac motor is not limited to the three-phase ac motor, and may be a motor of another number of phases.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An electric drive assembly provided in an electric device for driving the electric device, comprising:
a multiphase AC motor having a phase number k and a rated line voltage and a rated line current;
a DC power supply having a constant voltage power supply corresponding to the rated line voltage for supplying a DC power corresponding to the rated line current;
an inverter converting the direct current into alternating current according to a control signal and supplying the alternating current to the multiphase alternating current motor,
the method is characterized in that:
wherein the multiphase AC motor has m mutually independent multiphase windings,
each of the multi-phase windings has k mutually independent windings corresponding to the number of the k phases,
m of said windings of the same phase among m of said multi-phase windings are formed by m parallel windings,
the inverter has m inverter units corresponding to the m multi-phase windings respectively,
each of the inverter units has k bridge arms connected in parallel with each other corresponding to the k phases for supplying k routes of current to the corresponding multiphase windings,
each of the bridge arm parts comprises w inverter bridge arms connected in parallel with each other,
k and m are both positive integers more than 2, w is a positive integer between 2 and 4,
the characteristics of the w inverter bridge arms are consistent,
each of the inverter legs includes an upper leg semiconductor switching element and a lower leg semiconductor switching element connected in series with each other,
when the maximum output current of the upper bridge arm semiconductor switching element and the lower bridge arm semiconductor switching element is I 1 Said rated line current of said multiphase AC motor is I N When the utility model is used, the water is discharged,
the number m of the multi-phase windings satisfies the following condition:
m＞1.2(I N ÷wI 1 )。
2. the electric drive assembly of claim 1, further comprising:
a controller for controlling the operation of the electronic device,
wherein the upper arm semiconductor switching elements and the lower arm semiconductor switching elements have the same predetermined maximum output current,
the controller provides the control signal to the inverter according to a preset working period between the upper arm semiconductor switching element and the lower arm semiconductor switching element and according to a pulse signal corresponding to the on-current of the upper arm semiconductor switching element or the lower arm semiconductor switching element in a corresponding working time.
3. An electric drive assembly as set forth in claim 2, wherein:
wherein each of the bridge arm sections is composed of two inverter bridge arms connected in parallel with each other,
the preset maximum output current of the upper bridge arm semiconductor switching element and the lower bridge arm semiconductor switching element is 0.6-0.8 times of the output current of the bridge arm part.
4. An electric drive assembly as set forth in claim 1, wherein:
wherein the DC power supply is obtained by rectifying and filtering a battery or an AC power supply,
k is equal to or greater than three, the number of phases of the multi-phase winding is equal to k,
the multiphase windings are connected in a star shape, and the bridge arm parts with the number equal to the number of the phases of the multiphase windings are respectively connected with a plurality of end points of the corresponding multiphase windings, so that the line current is provided.
5. An electric drive assembly according to claim 4, wherein:
wherein k is equal to three, the multi-phase winding is a three-phase winding, the three-phase winding is connected in a triangular shape,
three of the bridge arm portions are connected to three end-to-end junctions of the corresponding three-phase windings, respectively, to supply the line current.
6. An electric drive assembly as set forth in claim 1, wherein:
wherein the multi-phase windings are independently mounted on an armature or armatures,
the armature is a stator or a rotor of the multiphase alternating current motor,
the multiphase alternating current motor is any one of an asynchronous motor and a synchronous motor,
the upper bridge arm semiconductor switch element or the lower bridge arm semiconductor switch element is a full-control device, and the full-control device is any one of an electric field effect transistor, a gate turn-off thyristor, an integrated gate commutated thyristor, an insulated gate bipolar transistor and an electric power bipolar transistor.
7. An inverter connected to a multiphase ac motor having a rated line voltage and a rated line current for k phases and having m mutually independent multiphase windings and a dc power supply having a constant voltage and supplying a dc power corresponding to the rated line current, respectively, for converting the dc power into an ac power according to a control signal and supplying the ac power to the multiphase ac motor, comprising:
m inverter units respectively corresponding to the m multi-phase windings,
wherein each of the multi-phase windings has k independent windings corresponding to the number of the k phases, respectively,
m of said windings of the same phase among m of said multi-phase windings are formed by m parallel windings,
each of the inverter units has k bridge arms connected in parallel with each other corresponding to the k phases for supplying k routes of current to the corresponding multiphase windings,
each of the bridge arm parts comprises w inverter bridge arms connected in parallel with each other,
k and m are both positive integers more than 2, w is a positive integer between 2 and 4,
the characteristics of the w inverter bridge arms are consistent,
each of the inverter legs includes an upper leg semiconductor switching element and a lower leg semiconductor switching element connected in series with each other,
when the maximum output current of the upper bridge arm semiconductor switching element and the lower bridge arm semiconductor switching element is I 1 Said rated line current of said multiphase AC motor is I N When the utility model is used, the water is discharged,
the number m of the multi-phase windings meets the following conditions:
m＞1.2(I N ÷wI 1 )。
8. a multiphase ac motor having k phases with a rated line voltage and a rated line current, connected to an inverter having m inverter units and converting a dc power from a dc power supply having a constant voltage into an ac power by the m inverter units in accordance with a control signal, each of the inverter units having k bridge sections connected in parallel to each other corresponding to the k phases, each of the bridge sections including two to four inverter bridge arms connected in parallel to each other, the multiphase ac motor comprising:
m mutually independent multi-phase windings,
wherein the m multi-phase windings correspond to the m inverter units, respectively,
each of the multi-phase windings has k independent windings corresponding to the k phases,
m of said windings of the same phase among m of said multi-phase windings are formed by m parallel windings,
each multiphase winding receives k routes of current provided by k bridge arm parts in the corresponding inversion unit,
both k and m are positive integers of 2 or more,
the characteristics of the w inverter bridge arms are consistent,
each of the inverter legs includes an upper leg semiconductor switching element and a lower leg semiconductor switching element connected in series with each other,
when the maximum output current of the upper bridge arm semiconductor switching element and the lower bridge arm semiconductor switching element is I 1 Said rated line current of said multiphase AC motor is I N When the temperature of the water is higher than the set temperature,
the number m of the multi-phase windings meets the following conditions:
m＞1.2(I N ÷wI 1 )。
9. an electrically powered device, comprising:
an electrical drive assembly according to any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910186882.8A CN109768757B (en) | 2016-12-21 | 2016-12-21 | Multi-phase alternating current motor, inverter, electric drive module, and electric device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611189060.8A CN106788106B (en) | 2016-12-21 | 2016-12-21 | Multi-phase AC motor, inverter, electric drive assembly and electric device |
| CN201910186882.8A CN109768757B (en) | 2016-12-21 | 2016-12-21 | Multi-phase alternating current motor, inverter, electric drive module, and electric device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611189060.8A Division CN106788106B (en) | 2016-12-21 | 2016-12-21 | Multi-phase AC motor, inverter, electric drive assembly and electric device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109768757A CN109768757A (en) | 2019-05-17 |
| CN109768757B true CN109768757B (en) | 2022-09-06 |
Family
ID=58893376
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910186882.8A Active CN109768757B (en) | 2016-12-21 | 2016-12-21 | Multi-phase alternating current motor, inverter, electric drive module, and electric device |
| CN201611189060.8A Active CN106788106B (en) | 2016-12-21 | 2016-12-21 | Multi-phase AC motor, inverter, electric drive assembly and electric device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611189060.8A Active CN106788106B (en) | 2016-12-21 | 2016-12-21 | Multi-phase AC motor, inverter, electric drive assembly and electric device |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN109768757B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018108040A1 (en) * | 2016-12-15 | 2018-06-21 | 上海理工大学 | Electric driving device, electric equipment, inverter and multiphase alternating current motor |
| CN109391217A (en) * | 2017-08-08 | 2019-02-26 | 上海理工大学 | Vidacare corp and electrical equipment |
| WO2019037096A1 (en) | 2017-08-25 | 2019-02-28 | 毕节添钰动力科技股份有限公司 | High-power motor realizing parallel control of windings |
| CN109720212B (en) * | 2017-10-27 | 2021-01-22 | 湖南中车时代电动汽车股份有限公司 | Control assembly for electric automobile |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705210A (en) * | 2004-05-31 | 2005-12-07 | 中原工学院 | Multi-three-phase permanent magnet synchronous motor with power supplied by an inverter |
| EP2037565A1 (en) * | 2007-09-12 | 2009-03-18 | Omron Corporation | Multi-phase AC motor driving device |
| CN104270012A (en) * | 2014-10-29 | 2015-01-07 | 兖州东方机电有限公司 | Multiphase frequency converter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868359A (en) * | 2012-04-27 | 2013-01-09 | 李永盼 | Alternating-current motor driver and transmission device |
| CN104393699A (en) * | 2014-12-16 | 2015-03-04 | 东南大学 | Winding unitized parallel winding structure of alternating current motor stator winding |
-
2016
- 2016-12-21 CN CN201910186882.8A patent/CN109768757B/en active Active
- 2016-12-21 CN CN201611189060.8A patent/CN106788106B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705210A (en) * | 2004-05-31 | 2005-12-07 | 中原工学院 | Multi-three-phase permanent magnet synchronous motor with power supplied by an inverter |
| EP2037565A1 (en) * | 2007-09-12 | 2009-03-18 | Omron Corporation | Multi-phase AC motor driving device |
| CN104270012A (en) * | 2014-10-29 | 2015-01-07 | 兖州东方机电有限公司 | Multiphase frequency converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109768757A (en) | 2019-05-17 |
| CN106788106A (en) | 2017-05-31 |
| CN106788106B (en) | 2019-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109768757B (en) | Multi-phase alternating current motor, inverter, electric drive module, and electric device | |
| CN106602947B (en) | Electric drive device, chopper circuit, DC motor, and electric apparatus | |
| CN102474172B (en) | Method for discharging intermediate circuit capacitor of intermediate voltage circuit converter | |
| US20100232190A1 (en) | Conversion of ac lines to hvdc lines | |
| CN107921880B (en) | Vehicle-side power circuit for supplying power in an electric vehicle | |
| US20170033593A1 (en) | Power Conversion Device and Power Conversion Method for Power Conversion Device | |
| WO2018108040A1 (en) | Electric driving device, electric equipment, inverter and multiphase alternating current motor | |
| CN104753402B (en) | Generator brake system and its control method | |
| CN102638189A (en) | Five-level power conversion device | |
| US20140203559A1 (en) | Connection for improved current balancing between parallel bridge circuits | |
| CN206237344U (en) | Vidacare corp, electrical equipment, inverter and multi-phase AC motor | |
| CN104245396A (en) | Method for discharging at least one capacitor of an electric circuit | |
| US20180240627A1 (en) | Direct-current interruption device | |
| EP3961886A1 (en) | Crowbar module for an active neutral point clamped power conversion assembly | |
| Wang et al. | A new concept of multilevel converter motor drive with modular design and split winding machine | |
| CN210591424U (en) | Electric automobile driving system and electric automobile | |
| CN218301052U (en) | High-power high-performance multiphase motor, electric drive device and electric equipment | |
| CN115133568A (en) | Active neutral point clamp switching sequence for parasitic inductance control of power conversion assembly | |
| CN215580964U (en) | Electric drive device and electric equipment | |
| CN216146173U (en) | Brushless DC motor, electric drive device, and electric device | |
| CN215870891U (en) | High-voltage intelligent power saving device | |
| CN106602963A (en) | Electric drive unit, electric device, inverter, and multiphase AC motor | |
| CN109391157B (en) | Universal converter transformer for high-voltage direct-current transmission system | |
| CN110401368A (en) | A kind of electric propulsion inverter applied to ship | |
| CN219227230U (en) | Wind power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |