CN101729018A - Electric motor driver - Google Patents
Electric motor driver Download PDFInfo
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- CN101729018A CN101729018A CN200910207127A CN200910207127A CN101729018A CN 101729018 A CN101729018 A CN 101729018A CN 200910207127 A CN200910207127 A CN 200910207127A CN 200910207127 A CN200910207127 A CN 200910207127A CN 101729018 A CN101729018 A CN 101729018A
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Abstract
The present invention provides an electric motor driver which ensures installation space and restrains cost. The regeneration action and power operation action which affect the action of the electric motor are realized. A regeneration power accumulation and discharging part (50) performs the following controls in regeneration action: namely, a transistor driving circuit (70) causes a regeneration power charging transistor (52) which limits the current through a first transistor current limiting circuit and a second transistor current limiting circuit (54, 60) to change from an active area to a saturated area, and simultaneously a regeneration power accumulation capacitor (51) is charged with the regeneration power charging transistor (52). The following control is performed in power operation, namely, the electric charges accumulated in the regeneration power accumulation capacitor (51) are discharged to an inverter (30) through a regeneration power discharging diode (53).
Description
Technical field
The present invention relates to a kind of motor drive that is used for drive motor.
Background technology
Fig. 4 illustrates the common structure of the motor drive that uses inverter circuit.In Fig. 4, the 301st, three-phase or single-phase AC power, the 302nd, be the rectifier of direct voltage with AC voltage conversion, the 303rd, impulse current suppresses circuit, and the 304th, make the level and smooth smmothing capacitor of direct voltage.Constitute converter portion 305 by rectifier 302, impulse current inhibition circuit 303 and smmothing capacitor 304.In addition, the 311st, inverter, the 312nd, motor control part, the 313rd, motor.Inverter 311 is an alternating voltage with dc voltage conversion, is controlled by motor control part 312, supplies with required electric power to motor 313.In addition, the 321st, the regeneration absorption resistance, the 322nd, the surge absorption diode, the 323rd, regeneration absorbs switch.
Under the situation of using these inverter shown in Figure 4 311 drive motors 313, by adopting the PWM on-off mode, suppress the power loss in the inverter circuit lower usually.
In this motor drive, carry out power operation and regeneration operation repeatedly, wherein, this power operation is to drive to motor 313 supply capabilities when drive motor 313, and this regeneration operation is to return electric power (regenerated electric power) from motor 313 when motor 313 is slowed down.Under the situation of carrying out the power operation, need big electric current in order sharply to quicken, the consumption electric power in the inverter 311 also increases.In addition, if regenerate operation, then return regenerated electric power from motor 313 to smmothing capacitor 304 via inverter 311.Here, knownly be a significant slowdown from high-speed cruising, big more from the regenerated electric power of motor 313.Therefore, because direct voltage that might smmothing capacitor 304 continues to rise, and surpass power component withstand voltage of inverter 311, so need certain regeneration to absorb countermeasure.
According to above-mentioned situation, shown in the motor drive as shown in Figure 4, absorb countermeasure and regeneration absorption resistance 321 and regeneration absorption switch 323 are set as regeneration usually.Thus, in the direct voltage of the smmothing capacitor 304 withstand voltage surplus that exists with respect to the power component of inverter 311, promptly under the situation greater than suitable threshold, will regenerate absorbs switch 323 closures, consumes regenerated electric powers by regeneration absorption resistance 321.Thus, can prevent the DC voltage rising of smmothing capacitor 304.In addition, surge absorption diode 322 needs corresponding and is provided with following,, when disconnecting in order to absorb switch 323 in regeneration, prevents the grade noise of generation of inductance one-tenth by the regeneration absorption resistance that is.
Fig. 5 illustrates the action example that the common regeneration of having used resistance absorbs circuit, and oblique line partly is the power loss that is caused by the regeneration absorption resistance.As shown in Figure 5, absorb in the circuit in common regeneration, power loss is more.
In addition, it is more and more higher to economize the requirement of electrification in recent years.Therefore, aspect following, try every possible means, that is, consume lavishly but put aside in smmothing capacitor 304 by making regenerated electric power from motor 313 can not be reproduced absorption resistance 321, thereby realize economizing electrification.
Fig. 6 illustrates the patent documentation 1 disclosed motor drive of having realized the electrification of aforesaid province.As shown in Figure 6, in this motor drive, impulse current shown in Figure 4 is suppressed circuit 303 replace with the coil 306 that power-factor improvement is used.In addition, in this motor drive, replace regeneration absorption resistance 321 shown in Figure 4 and be provided with anti-phase blocking diode 332.Anti-phase blocking diode 332 is set to the part that inverter 311 is connected, and prevents to regenerate to absorb the reverse charging of series capacitor 331.Thus, in this motor drive, when slowing down, in regeneration absorption series capacitor 331, put aside regenerated electric power.And, when power moves, absorb diverter switch 333 by switching regeneration, smmothing capacitor 304 and regeneration absorption series capacitor 331 are connected in series, effectively utilize the electric charge of savings in regeneration absorption series capacitor 331.By adopting this structure, the power loss that is caused by regeneration absorption resistance 321 is as shown in Figure 4 disappeared, realize economizing electrification.
Fig. 7 illustrates patent documentation 2 disclosed motor drives.In this motor drive,, adopt the mode of charging to regenerated electric power savings capacitor 342 with converter 341 via charging as economizing the high regenerated electric power absorption process of electric power effect.
This motor drive as current detecting unit, is provided with the 1st current detecting unit 343 that detects input current, and the 2nd current detecting unit 344 that detects for the electric current that charges to regenerated electric power savings capacitor 342.In addition, this motor drive as voltage detection unit, is provided with the 1st voltage detection unit 345 that the voltage to smmothing capacitor 304 detects, and the 2nd voltage detection unit 346 that the voltage of regenerated electric power savings capacitor 342 is detected.This motor drive utilizes control circuit 347 and memory 348, calculate input power capacity on one side, control charging is on one side controlled the savings or the discharge of regenerated electric power with converter 341.Thus, this motor drive is by complicated structure, and realization is suitable for the structure of the load of larger capacity.
Patent documentation 1: No. 3678582, Japan's special permission
Patent documentation 2: the spy of Japan opens flat 11-299275 communique
Summary of the invention
Yet, in patent documentation 1 disclosed motor drive (earlier figures 6),, when power moves, can utilize the electric charge of this savings, so it is obvious to economize the electric power effect owing to use regeneration to absorb series capacitor 331 savings regenerated electric powers.But, in patent documentation 1 disclosed motor drive, when reality is used, have some problems.
At first, absorb in the series capacitor 331, when power move and regeneration when moving, all flow through switching current all the time in the regeneration that series connection is inserted.Therefore, regeneration absorption series capacitor 331 need be low-impedance capacitor.And, to absorb series capacitor 331 series connection in order regenerating and to insert in the smmothing capacitors 304, need make regeneration absorb series capacitor 331 and being big capacity, with the withstand voltage damage of the power component that can not cause inverter 311.But, if absorbing series capacitor 331, regeneration becomes big capacity, the restriction that then should regeneration absorbs configuration spaces such as series capacitor 331 or other circuit increases, and cost also increases, and becomes the obstruction of application facet.
In addition, in patent documentation 1 disclosed motor drive, (during deceleration) switching regeneration absorbs diverter switch 333 when the regeneration operation, and the negative side that makes regeneration absorb series capacitor 331 is connected with zero potential.Therefore, the direct voltage of the inverter 311 in when operation regeneration significantly reduces, thereby, changing with respect to the action of the motor of instruction, the action of motor becomes not preferred.
In addition, in patent documentation 2 disclosed motor drives (earlier figures 7), jumbo regenerated electric power savings capacitor 342 is set and the savings regenerated electric power.And charging is controlled with converter 341, with the regenerated electric power discharge that can when power moves, will put aside.The purpose of this structure is, can calculate input electric power and carries out the savings and the discharge of regenerated electric power reliably, and its characteristic is, also can use the electric charge of putting aside by regeneration effectively when waiting having a power failure.But, in this motor drive, need carry out the processing of following complexity, promptly, 343,344 and 2 voltage detection units 345,346 of 2 current detecting units are set, the memory 348 of read control circuit 347, computing input electric power and control etc.Therefore, estimate to produce sizable cost and rise in order to realize this motor drive, the purposes for the middle low capacity about number kW is difficult to practicability aspect cost.
In addition, about realizing being considered to the mode of most important charging aspect province's electrification with converter 341, material particular in following actions is unclear, that is, flow through charging and import the influence that power supply unit or converter portion 305 apply with the current/voltage and the power loss of converter 341, the initial actuating, 340 pairs of the regenerated electric power savings discharge parts that rigidly connect the regenerated electric power savings discharge part 340 behind the logical input power supply.And, ability and the performance about the situation meeting of aforementioned manner regenerated electric power being put aside and discharged.In addition, cost and installing space also can change.
Problem of the present invention is, guarantees installing space easily and suppresses cost, realizes the regeneration action and the power run action that can not exert an influence to the action of motor.
In order to solve aforementioned problems, the motor drive of record is characterised in that to have in the technical scheme 1 involved in the present invention: AC power; Converter, its AC voltage conversion of utilizing rectifier that aforementioned AC power is exported is direct voltage, utilizes the direct voltage after the conversion, suppresses circuit via impulse current smmothing capacitor is charged; Inverter, its dc voltage conversion with aforementioned converter output is that alternating voltage drives the aforementioned electric motivation; And regenerated electric power savings discharge cell, it is put aside the regenerated electric power that produces when the aforementioned motor deceleration, and aforementioned regenerated electric power savings discharge cell has: regenerated electric power savings capacitor, it puts aside aforementioned regenerated electric power; The current/voltage control element, it flows into charging current in aforementioned regenerated electric power savings capacitor; Current limiting unit, the electric current of its restriction aforementioned currents voltage controlled element; The element drives unit, it drives the aforementioned currents voltage controlled element according to the potential difference between the magnitude of voltage of the magnitude of voltage of aforementioned smmothing capacitor and aforementioned regenerated electric power savings capacitor; And regenerated electric power arresting element, it is when the power run action, realization is used for the electric charge of aforementioned regenerated electric power savings capacitor to path that aforementioned inverter is emitted, aforementioned regenerated electric power savings discharge cell, when the regeneration action, carry out following control, promptly, the aforementioned components driver element is according to the potential difference between the magnitude of voltage of the magnitude of voltage of aforementioned smmothing capacitor and aforementioned regenerated electric power savings capacitor, the aforementioned currents voltage controlled element that utilizes the aforementioned currents limiting unit to limit electric current is changed to the zone of saturation from the active region, utilize this current/voltage control element simultaneously, to aforementioned regenerated electric power savings capacitor savings regenerated electric power, when the power run action, carry out following control, promptly, the electric charge that to put aside in aforementioned regenerated electric power savings capacitor is emitted to aforementioned inverter via aforementioned regenerated electric power arresting element.
In addition, the motor drive of record is characterised in that in the technical scheme 2 involved in the present invention, in the motor drive that technical scheme 1 is put down in writing, the aforementioned components driver element, potential difference between the magnitude of voltage that the magnitude of voltage and the aforementioned regenerated electric power of aforementioned smmothing capacitor are put aside capacitor surpasses under the situation of the 1st threshold value, begin control to aforementioned regenerated electric power savings capacitor savings regenerated electric power, be lower than in the aforementioned electric potential difference under the situation of the 2nd threshold value littler than aforementioned the 1st threshold value, end control to aforementioned regenerated electric power savings capacitor savings regenerated electric power, when aforementioned regenerated electric power savings capacitor is put aside regenerated electric power, the aforementioned currents voltage controlled element that utilizes the aforementioned currents limiting unit to limit electric current is changed above beginning under the situation of aforementioned the 1st threshold value in the aforementioned electric potential difference to the zone of saturation from the active region.
In addition, the motor drive of record is characterised in that in the technical scheme 3 involved in the present invention, in the motor drive that technical scheme 2 is put down in writing, the aforementioned currents limiting unit, potential difference between the magnitude of voltage that the magnitude of voltage and the aforementioned regenerated electric power of aforementioned smmothing capacitor are put aside capacitor surpasses under the situation of the 3rd threshold value higher than aforementioned the 1st threshold value, improves the degree that the electric current that flows through the aforementioned currents voltage controlled element is limited.
The effect of invention
According to the present invention, by the current/voltage control element that utilizes current limiting unit to limit electric current is changed to the zone of saturation from the active region, utilize this current/voltage control element to aforementioned regenerated electric power savings capacitor savings regenerated electric power simultaneously, thereby the direct voltage that can prevent inverter sharply reduces, and suppresses the variation of the trend of motor.
In addition,, regenerated electric power savings capacitor is charged, can be easy to guarantee installing space, and suppress cost by utilizing unique current/voltage control element according to the present invention.
In addition, invention according to technical scheme 2, by monitoring according to the 1st threshold value and the 2nd threshold value, in the time of can beginning at regenerated electric power savings and end, control the potential difference between the magnitude of voltage of smmothing capacitor and the magnitude of voltage that regenerated electric power is put aside capacitor rightly to regenerated electric power savings capacitor.
In addition, according to the invention of technical scheme 3,, the current/voltage control element is moved rightly by monitoring according to the 3rd threshold value.
Description of drawings
Fig. 1 is the figure of structure of the motor drive of expression the 1st execution mode of the present invention.
Fig. 2 is the performance plot of the variation of the voltage of expression smmothing capacitor, the voltage of regenerated electric power savings capacitor etc.
Fig. 3 is the figure of structure of the motor drive of expression the 2nd execution mode.
Fig. 4 is the figure of the structure of the existing common motor drive of expression.
Fig. 5 is the performance plot that the common regeneration of expression absorbs the action example of circuit.
Fig. 6 is the figure of the structure of expression patent documentation 1 disclosed motor drive.
Fig. 7 is the figure of the structure of expression patent documentation 2 disclosed motor drives.
Embodiment
With reference to accompanying drawing, detailed description is used to implement best mode of the present invention (hereinafter referred to as execution mode).
(the 1st execution mode)
(structure)
The 1st execution mode is the motor drive that is used for drive motor.
Fig. 1 represents the structure of the motor drive of the 1st execution mode.Motor drive shown in Figure 1 is to use the motor drive of inverter circuit.
As shown in Figure 1, motor drive has converter portion 10, inverter 30, regenerated electric power savings discharge part (regenerated electric power savings discharge cell) 50, motor 101 and motor control part (electromotor control circuit) 102.
Converter portion 10 has power supply 11, rectifier 12, impulse current inhibition circuit 20 and smmothing capacitor 14.Power supply 11 is three-phase or single-phase AC power.For example, power supply 11 is the 50Hz of AC 100V ± 15% or AC 200V ± 15% or three-phase or the single phase alternating current power supply of 60Hz.Rectifier 12 is a direct voltage with the AC voltage conversion of power supply 11 outputs.
Impulse current suppresses circuit 20 to have: resistance 21, when it is suppressed at power connection from the impulse current of power supply 11; And input current by-pass switch 22, it carries out bypass with resistance 21 behind power supply 11 regular events.Resistance 21 has several Ω to tens of Ω.Smmothing capacitor 14 is the smmothing capacitors that make direct voltage level and smooth.
Regenerated electric power savings discharge part 50 is connected on the circuit 111,112, and this circuit 111,112 has connected smmothing capacitor 14 and inverter 30 etc.
Regenerated electric power savings discharge part 50 has regenerated electric power savings capacitor 51, regenerated electric power charging transistor 52, regenerated electric power discharge diode the 53, the 1st transistor current restricting circuits the 54, the 2nd transistor current restricting circuits 60, transistor driver circuit 70 and discharge part 80.
Regenerated electric power savings capacitor 51 is capacitors of mainly regenerated electric power of (during speed-down action) when regeneration is moved being put aside.Regenerated electric power charging transistor 52 works as the current/voltage control element that charging current is flowed in regenerated electric power savings capacitor 51, for example is IGBT, MOSFET, bipolar transistor etc.
The electric charge that regenerated electric power discharge diode 53 is used for when being formed on the power run action regenerated electric power is put aside capacitor 51 is to path that inverter 30 is emitted.That is, regenerated electric power discharge diode 53 is the regenerated electric power arresting elements that constitute the path that regenerated electric power is emitted.Regenerated electric power discharge diode 53 can be independent diode, also can be the parasitic diode of regenerated electric power charging transistor 52.
The 1st transistor current control circuit 54 mainly is used to limit the electric current of regenerated electric power charging transistor 52 when power supply 11 is connected.The 1st transistor current restricting circuits 54 for example is a resistance.
In addition, the 2nd transistor current restricting circuits 60 and 54 co-operatings of the 1st transistor current restricting circuits, the electric current of restriction regenerated electric power charging transistor 52.For example, the 2nd transistor current restricting circuits 60 has 3 resistance 61,62,63, hysteresis comparator 64 and switch 65.Aforementioned the 1st transistor current restricting circuits 54 and the 2nd transistor current restricting circuits 60 constitute current limiting unit.
Transistor driver circuit 70 composed component driver elements, the potential difference between the magnitude of voltage of the magnitude of voltage of its supervision smmothing capacitor 14 and regenerated electric power savings capacitor 51 drives regenerated electric power charging transistor 52 according to this potential difference.By driving regenerated electric power charging transistor 52, charging current is flowed in regenerated electric power savings capacitor 51.For example, transistor driver circuit 70 has 2 resistance 71,72 and hysteresis comparator 73.
The control grid 73s of hysteresis comparator 73 constitutes, and under the lower situation of the motor speed of motor 101, can regenerated electric power charging transistor 52 be disconnected according to the instruction from motor control part 102.In addition, in Fig. 1 and Fig. 3, motor control part 102 is not connected with control grid 73s, but in fact connects, and control grid 73s is by motor control part 102 controls.
The connection status of said structure is as follows.
On the circuit 113 that connects between with circuit 111 and circuit 112, be connected in series with regenerated electric power savings capacitor 51, regenerated electric power charging transistor 52 and the 1st transistor current restricting circuits (resistance) 54 in the following sequence., go up connection regenerated electric power savings capacitor 51 here, go up connection the 1st transistor current restricting circuits 54 at the emitter (E) of regenerated electric power charging transistor 52 at the collector electrode (C) of regenerated electric power charging transistor 52.
In addition, in transistor driver circuit 70, on circuit 113a and the circuit 114 that circuit 112 is connected regenerated electric power put aside between capacitor 51 and the regenerated electric power charging transistor 52, be connected in series with 2 resistance 71,72.And, in transistor driver circuit 70,, on this circuit 114a, be connected with hysteresis comparator 73 in order to measure the voltage (dividing potential drop) of the circuit 114a between these 2 resistance 71,72.In addition, hysteresis comparator 73 is connected with regenerated electric power charging transistor 52 (base stage (B)).
In addition, in the 2nd transistor current restricting circuits 60, on circuit 113a and the circuit 115 that circuit 112 is connected regenerated electric power put aside between capacitor 51 and the regenerated electric power charging transistor 52, be connected in series with 2 resistance 61,62.Here, each resistance value of 2 resistance 61,62 that the 2nd transistor current restricting circuits 60 is had, each resistance value of 2 resistance 71,72 that had with transistor driver circuit 70 is identical value.
In addition, in the 2nd transistor current restricting circuits 60,, be connected in series with resistance 63 and switch 65 with on the circuit 113b between regenerated electric power charging transistor 52 and the 1st transistor current restricting circuits 54 and the circuit 116 that circuit 112 is connected.In the 2nd transistor current restricting circuits 60,, on this circuit 115a, be connected with hysteresis comparator 64 in order to measure the voltage (dividing potential drop) of the circuit 115a between 2 resistance 61,62.In addition, utilize hysteresis comparator 64 to make switch 65 closed or disconnections.
In addition, on circuit 113a and the circuit 117 that circuit 112 is connected regenerated electric power put aside between capacitor 51 and the regenerated electric power charging transistor 52, dispose regenerated electric power discharge diode 53.The anode of regenerated electric power discharge diode 53 is connected on the circuit 112, and negative electrode is connected on the circuit 113a.In addition, in discharge part 80, on the circuit 118 that the circuit 113a between circuit 111 and regenerated electric power savings capacitor 51 and the regenerated electric power charging transistor 52 is connected, be connected in series with discharge resistance 81 and discharge switch 82.
According to the action of motor drive the structure shown in above-mentioned is described below.The action of motor drive is roughly divided into (1) power supply and is rigidly connected initial charge action, (2) motor run action (power run action) (with reference to (V), (VI) of Fig. 2) after logical.In addition, (2) motor run action can be decomposed into that (2-1) accelerated motion (with reference to (V) of Figure 22), (2-2) accelerated motion finishes, at the uniform velocity action (with reference to (VI) of Fig. 2), (2-3) speed-down action (regeneration action) (with reference to (I), (II), (III) of Fig. 2), and (2-4) halted state (with reference to (IV) of Fig. 2).Action according to these each structures more than action specification.
(1) power supply rigidly connects the initial charge action after leading to.
Here, power supply 11 rigidly connect logical after, the magnitude of voltage that is smmothing capacitor 14 and regenerated electric power savings capacitor 51 is zero state.Like this, smmothing capacitor 14 and regenerated electric power savings capacitor 51 suppresses circuit 20 by impulse current and suppresses input current and slowly charging.
At this moment, at first smmothing capacitor 14 begins charging.Then, if the charging voltage of smmothing capacitor 14 reaches about tens of V, then regenerated electric power savings capacitor 51 begins charging.Specifically, by following action, smmothing capacitor 14 and regenerated electric power savings capacitor 15 begin charging.
Transistor driver circuit 70 (hysteresis comparator 73) monitors the magnitude of voltage of the circuit 114a between 2 resistance 71,72.Thus, the potential difference (drop) between the magnitude of voltage of the magnitude of voltage and the regenerated electric power of smmothing capacitor 14 being put aside capacitor 51 by partial pressure value monitors.And,,, then drive regenerated electric power charging transistor 52 if its value that monitors (partial pressure value) surpasses the 1st threshold value (charging voltage of smmothing capacitor 14 is about tens of V) of regulation for transistor driver circuit 70 (hysteresis comparator 73).By driving this regenerated electric power charging transistor 52, make charging current begin in regenerated electric power savings capacitor 51, to flow into, regenerated electric power savings capacitor 51 begins charging.
In addition, in the 2nd transistor current restricting circuits 60, also the magnitude of voltage to the circuit 115a between 2 resistance 61,62 monitors.Thus, with transistor driver circuit 70 in the same manner, by partial pressure value (is identical value with the partial pressure value in the transistor driver circuit 70) potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 is monitored.In addition, for the 2nd transistor current restricting circuits 60,, then the charging current by regenerated electric power charging transistor 52 is applied stronger restriction if its value that monitors surpasses the 3rd threshold value of regulation.Promptly, in the 2nd transistor current restricting circuits 60, if its value that monitors (partial pressure value) surpasses the 3rd threshold value of regulation, then hysteresis comparator 64 disconnects switch 65, in the emitter side of regenerated electric power charging transistor 52, only make the 1st transistor current restricting circuits 54 (resistance 54) action.That is, in the resistance 54,63 that the emitter side of regenerated electric power charging transistor 52 is connected in parallel, only make a side resistance 54 be in "on" position.
Thus, the resistance between regenerated electric power charging transistor 52 and the circuit 112 is increased, the charging current by regenerated electric power charging transistor 52 is applied stronger restriction.Here, the 3rd threshold value is the value than the 1st threshold value big (height).
Thus, the 2nd transistor current restricting circuits 60 is kept the closure state of switch 65 before surpassing the 3rd threshold value of stipulating by the value that monitors at it, and utilizes the charging current of 2 resistance, 54,63 restricted passage regenerated electric power charging transistors 52.In addition, the 2nd transistor current restricting circuits 60 disconnects switch 65 when surpassing the 3rd threshold value of stipulating by the value that monitors at it, and utilizes the connection that a side resistance 54 is only arranged, and the charging current by regenerated electric power charging transistor 52 is carried out stronger restriction.That is, when between smmothing capacitor 14 and regenerated electric power savings capacitor 51, producing the current potential that surpasses the 3rd threshold value, the charging current by refresh charging transistor 52 is carried out stronger restriction.
Thus, utilize the 1st and the 2nd transistor current restricting circuits 54,60 (resistance 54 and resistance 63 the two or only resistance 54), the electric current of regenerated electric power charging transistor 52 is flow through in restriction all the time, can not apply very big load to regenerated electric power charging transistor 52.Its result can move regenerated electric power charging transistor 52 when power supply 11 rigidly connects the initial charge of the regenerated electric power savings capacitor 51 after leading to safely.
In addition, if the charging of smmothing capacitor 14 and regenerated electric power savings capacitor 51 finishes, charging current no longer flows through regenerated electric power charging transistor 52, and then regenerated electric power charging transistor 52 disconnects.Thus, regenerated electric power savings capacitor 51 keeps the voltage of this moment, waits for that then motor 101 is driven (power run action).
(2) motor run action
For the action of each structure in the motor run action, use Fig. 2 to describe.
(2-1) accelerated motion (action that (V) of Fig. 2 is interval)
Electric current flows into to the motor 101 as load via inverter 30 from smmothing capacitor 14 and regenerated electric power savings capacitor 51.Thus, in smmothing capacitor 14 and regenerated electric power savings capacitor 51, voltage reduces.In addition, if smmothing capacitor 14 and regenerated electric power are put aside the voltage of capacitor 51 less than the direct voltage of supplying with from power supply 11 (suitable with the output of rectifier 12), then the electric current from power supply 11 also flows into to inverter 30.
Thus, when motor 101 accelerated motions, the electric power based on smmothing capacitor 14 and regenerated electric power savings capacitor 51 and power supply 11 generations is consumed by motor 101.
In addition, for regenerated electric power savings capacitor 51, its discharging current is emitted via the regenerated electric power discharge diode 53 that is connected in series with this regenerated electric power savings capacitor 51.Therefore, in 51 continuous discharges of regenerated electric power savings capacitor, the voltage that makes regenerated electric power savings capacitor 51 is during less than the voltage of power supply 11, and the discharge of regenerated electric power savings capacitor 51 stops naturally.Thus, the voltage of regenerated electric power savings capacitor 51 remains minimum in accelerated motion.
(2-2) accelerated motion end, at the uniform velocity action (action that (VI) of Fig. 2 is interval)
The electric power that continuation is supplied with from power supply 11 to inverter 30.At this moment, regenerated electric power savings capacitor 51 is the states that carry out standby with minimum voltage value, is to wait for speed-down action (action that (II) of Fig. 2 is interval) beginning and the state that returns regenerated electric power.On the other hand, in smmothing capacitor 14, charge by power supply 11.Therefore, the voltage of regenerated electric power savings capacitor 51 is compared with smmothing capacitor 14, becomes lower value.Specifically, shown in (VI) interval of Fig. 2, the voltage of regenerated electric power savings capacitor 51 is compared with the voltage of smmothing capacitor 14, becomes the value about low 10V.
(2-3) speed-down action (regeneration action)
For speed-down action (regeneration action), as described belowly can be decomposed into (2-3-1) at the uniform velocity action in mid-term, and (2-3-3) action in latter stage of speed-down action of initial actuating (action the when speed-down action after the power run action begins), (2-3-2) speed-down action of the speed-down action after the release.
(2-3-1) initial actuating of the speed-down action after the release (action that (I) of Fig. 2 is interval) at the uniform velocity
Via inverter 30, return regenerated electric power to smmothing capacitor 14 from motor 101.Thus, the voltage of smmothing capacitor 14 begins to increase.But under the initial actuating state of this speed-down action, regenerated electric power savings discharge circuit 50 does not still move.
(2-3-2) action in the mid-term of speed-down action (action that (II) of Fig. 2 is interval)
If the voltage of smmothing capacitor 14 increases, the tens of V that rise of the state before the beginning of slowing down, then regenerated electric power savings discharge circuit 50 begins action, via regenerated electric power charging transistor 52, makes charging current begin to flow into to regenerated electric power savings capacitor 51.Promptly, for transistor driver circuit 70 (hysteresis comparator 73), if the potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 reaches about tens of V, the value that monitors surpasses the 1st threshold value, then drives regenerated electric power charging transistor 52.Thus, charging current begins to flow in regenerated electric power savings capacitor 51.In addition, this charging action to regenerated electric power savings capacitor 51, comparing above the situation that predetermined threshold voltage then begins regeneration absorption (carrying out electric power storage by the regeneration absorption resistance) with the common voltage according to the observed smmothing capacitor of regeneration absorption resistance (Fig. 4), is diverse action.
In addition, make switch 65 closures usually this moment in the 2nd transistor current restricting circuits 60.Therefore, become 54, the 63 pairs of states that limit by the charging current of regenerated electric power charging transistor 52 of resistance that utilize.In this state, two ends at regenerated electric power charging transistor 52, apply and smmothing capacitor 14 and regenerated electric power savings capacitor 51 between the suitable voltage of potential difference, and make bigger charging current (in the example of Fig. 2) flow through regenerated electric power charging transistor 52 for surpassing the charging current of 10 (A).Therefore, 52 moments of regenerated electric power charging transistor are born very big electric power (in the example of Fig. 2, peak value is about 240 (W)), become in so-called active region and move.But the charging of regenerated electric power savings capacitor 51 is carried out at short notice, and the level of regenerated electric power savings capacitor 51 is at short notice near the level of smmothing capacitor 14.In the example of Fig. 2, the time of moving in the active region (operate times of (2)) only is 10ms, is the time of lacking very much with respect to the acceleration and deceleration time.
(2-3-3) action in the latter stage of speed-down action (action that (III) of Fig. 2 is interval)
Potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 becomes only several V.At this moment, the action of regenerated electric power savings transistor 52 transits to the zone of saturation from the active region.Therefore, the power loss of the regenerated electric power charging transistor 52 in the action in the latter stage of speed-down action is the few amounts that caused by saturated loss.
Here, transistor driver circuit 70 (hysteresis comparator 73) is to the potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51, monitor that by its partial pressure value the 2nd threshold value that is lower than regulation in this value (partial pressure value) is kept charged state before.Here, the 2nd threshold value is the value that is lower than the 1st threshold value.That is, transistor driver circuit 70 is in the value that monitors (partial pressure value) and is less than or equal to the 1st threshold value and more than or equal in during between the 2nd threshold value, keeps driving regenerated electric power charging transistor 52.Thus, the potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 for number V during in, keep driving regenerated electric power charging transistor 52.
(2-4) halted state (action that (IV) of Fig. 2 is interval)
In the power consumption of motor 101 or inverter 30 seldom, electric current no longer flows through the timing of regenerated electric power charging transistor 52, and regenerated electric power charging transistor 52 disconnects.Promptly, for transistor driver circuit 70 (hysteresis comparator 73), if the potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 is less than several V of regulation, promptly, the value that monitors (partial pressure value) is lower than the 2nd threshold value, then regenerated electric power charging transistor 52 is disconnected.
Here, the summary of a series of actions of the regenerated electric power charging transistor 52 of (during the regeneration action) is as described below when above speed-down action.
Transistor driver circuit 70 is (during the regeneration action) when speed-down action, the potential difference between the magnitude of voltage of the magnitude of voltage of supervision smmothing capacitor 14 and regenerated electric power savings capacitor 51.Specifically, monitor this potential difference by partial pressure value.In addition, transistor driver circuit 70 drives regenerated electric power charging transistor 52 after its value that monitors surpasses the 1st threshold value.Thus, charging current flows in regenerated electric power savings capacitor 51.At this moment, utilize the upper limit of the electric current of the 1st and the 2nd transistor current restricting circuits 54,60 restriction regenerated electric power charging transistors 52 simultaneously.That is, utilize the upper limit of the current value of 2 resistance, 54, the 63 restriction regenerated electric power charging transistors 52 that are connected in parallel.Thus, Yi Bian regenerated electric power charging transistor 52 flows through the electric current that this current value has the upper limit, Yi Bian transit to the zone of saturation from the active region and move.In addition, in case electric current begins to flow through regenerated electric power charging transistor 52, then before being lower than the 2nd threshold value, keep its charged state.
In example shown in Figure 2, become active region (2) during (after speed-down action begins mid-term action during) shorter, be about 10ms.In addition, become zone of saturation (3) during in (after speed-down action begins latter stage action during), because though the potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 reduces, but still remaining the voltage that surpasses the 2nd threshold value, institute continues to flow into down to the electric current of regenerated electric power charging transistor 52.
In addition, be not limited to when initial charge is moved, when speed-down action (during the regeneration action), for the 2nd transistor current restricting circuits 60, if its value that monitors surpasses the 3rd threshold value, then also can apply stronger restriction (can only connect resistance 54) to charging current by regenerated electric power charging transistor 52.Thus, for example when moving except initial charge, potential difference when transition between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 becomes under the big situation (when for example having a power failure), also can apply stronger restriction to the charging current of regenerated electric power charging transistor 52.
(3) other action
Action when (3-1) rotating speed of motor 101 is low
When the control grid 73s of hysteresis comparator 73 hangs down at the rotating speed of motor 101,, regenerated electric power savings discharge part 50 is stopped according to instruction from motor control part 102.Specifically, make transistor driver circuit 70 (specifically hysteresis comparator 73) switch to off-state from on-state.Thus, rotating speed at motor 101 is lower than under the situation of regulation rotating speed, because the regenerated electric power from motor 101 is less, so do not need to make 50 actions of regenerated electric power savings discharge part, thereby can move by not making regenerated electric power savings discharge part 50, and the useless power loss that causes because of regenerated electric power savings discharge part 50 is suppressed.
Action when (3-2) being judged as power supply 11 disconnections
When being judged as power supply 11 disconnections (off), make discharge switch 82 closures.For example, the judgement that disconnects of power supply 11 monitors the output voltage of power supply 11 and carries out.Thus, if discharge switch 82 closures, then via discharge resistance 81, regenerated electric power savings capacitor 51 begins discharge.Its result produces potential difference between smmothing capacitor 14 and regenerated electric power savings capacitor 51, when the value that monitors reached the 1st threshold value, regenerated electric power charging transistor 52 started, the action of beginning regenerated electric power savings.Thus, smmothing capacitor 14 begins discharge, and smmothing capacitor 14 and regenerated electric power savings capacitor 51 move, so that their current potential becomes poised state.On the other hand, in order to keep discharge switch 82 closures, by making regenerated electric power savings capacitor 51 via discharge resistance 81 continuous discharges, and between smmothing capacitor 14 and regenerated electric power savings capacitor 51, produce potential difference once more, make the value that monitors reach the 1st threshold value, smmothing capacitor 14 is emitted electric charge.By repeating above-mentioned action, can after disconnecting, power supply 11 make smmothing capacitor 14 and regenerated electric power savings capacitor 51 finish discharge rapidly.
In addition, in the 1st execution mode, converter portion 10 utilizes rectifier that the AC voltage conversion of aforementioned AC power output is direct voltage, and realization utilizes the direct voltage after the conversion, the converter that smmothing capacitor is charged via impulse current inhibition circuit.In addition, inverter 30 realizes that the dc voltage conversion with aforementioned converter output is the inverter that alternating voltage drives the aforementioned electric motivation.In addition, regenerative circuit savings discharge part 50 is realized regenerated electric powers savings discharge cells, and it is put aside the regenerated electric power that produces when the aforementioned motor deceleration.In addition, regenerated electric power savings capacitor 51 is realized the regenerated electric power savings capacitor of the aforementioned regenerated electric power of savings.In addition, regenerated electric power charging transistor 52 is realized the current/voltage control element, and it makes electric current flow through aforementioned regenerated electric power savings transistor.In addition, the 1st and the 2nd transistor current restricting circuits 54,60 realizes the limiting unit that the electric current to the aforementioned currents voltage controlled element limits.In addition, transistor driver circuit 70 is realized the element drives unit, and it drives the aforementioned currents voltage controlled element according to the potential difference between the magnitude of voltage of the magnitude of voltage of aforementioned smmothing capacitor and aforementioned regenerated electric power savings capacitor.In addition, regenerated electric power discharge diode 53 is realized the regenerated electric power arresting elements, and it realizes being used for the electric charge of aforementioned regenerated electric power savings capacitor to path that aforementioned inverter is emitted when the power run action.And, in the 1st execution mode, aforementioned regenerated electric power savings discharge cell is realized following control when the regeneration action, promptly, the aforementioned components driver element is according to the potential difference between the magnitude of voltage of the magnitude of voltage of aforementioned smmothing capacitor and aforementioned regenerated electric power savings capacitor, the aforementioned currents voltage controlled element that utilizes the aforementioned currents limiting unit to limit electric current is changed to the zone of saturation from the active region, utilize this current/voltage control element simultaneously, to aforementioned regenerated electric power savings capacitor savings regenerated electric power, when the power run action, realize following control, promptly, the electric charge that to put aside in aforementioned regenerated electric power savings capacitor is emitted to aforementioned inverter via aforementioned regenerated electric power arresting element.
(effect and effect)
(1) in regenerated electric power savings capacitor 51, only moment that power supply 11 is connected from power supply 11 side inflow electric currents, behind power supply 11 regular events, substantially not from power supply 11 inflow currents.Thus, regenerated electric power savings capacitor 51 works as the capacitor of regenerated electric power savings usefulness, observes from power supply 11 sides, can be as voxel.That is, form regenerated electric power savings capacitor 51 and can not suppress the structure that circuit 20 etc. exerts an influence power supply 11 and rectifier 12, impulse current.Therefore, the electric power of electric consumption 11 hardly in regenerated electric power savings discharge part 50.
Thus, can change the value of regenerated electric power savings capacitor 51 as required and only, need not to change the other parts of regenerated electric power savings discharge part 50.Thus, regenerated electric power savings discharge part 50 is as the treatment circuit of regenerated electric power, flexibility height.In addition, regenerated electric power savings capacitor 51 is not subjected to power supply 11 to wait the restriction of other structure, guarantees configuration space easily, can suppress cost.
(2) when the regeneration action (during speed-down action), utilize 54,60 pairs of charging currents of the 1st and the 2nd transistor current restricting circuits to limit, regenerated electric power charging transistor 52 is moved and change to the zone of saturation from the active region by regenerative circuit charging transistor 52.Thus, when regenerated electric power savings capacitor 51 savings regenerated electric powers, can prevent that the direct voltage of inverter 30 from sharply reducing when the regeneration action, the trend that suppresses motor changes.
(3) when the regeneration action, make 52 actions of regenerated electric power charging transistor, in regenerated electric power savings capacitor 51, put aside regenerated electric power.In addition, when the power run action, will put aside the electric charge of putting aside in the capacitor 51 at regenerated electric power and emit via regenerated electric power discharge diode 53.Thus, can realize regeneration action and power run action by simple structure.
(4) by utilizing the 1st threshold value and the 2nd threshold value to monitor, potential difference between the magnitude of voltage that the magnitude of voltage and the regenerated electric power of smmothing capacitor 14 can be put aside capacitor 51 suppresses lowlyer, make its regenerated electric power when beginning savings action initial actuating of the speed-down action (time) for about tens of V, when the release of regenerated electric power savings (latter stage of deceleration control is when moving) for number V about.Promptly, by utilizing the 1st threshold value and the 2nd threshold value to monitor, can be to the beginning of regenerated electric power savings capacitor 51 savings regenerated electric powers or stop the time, the potential difference between the magnitude of voltage of the magnitude of voltage of smmothing capacitor 14 and regenerated electric power savings capacitor 51 is controlled rightly.For example, do not need to be provided with the regeneration absorption resistance (the regeneration absorption resistance 321 of Fig. 4) that consumes a large amount of electric power thus.
(5) by monitoring, the charging current by regenerated electric power charging transistor 52 is applied stronger restriction according to the 3rd threshold value.Thus, regenerative current charging transistor 52 is suitably moved.
(6) after regenerative current charging transistor 52 carries out the action of active region in the utmost point short time (about 10ms), transit to the action of zone of saturation.Thus, can suppress power consumption in the regenerated electric power charging transistor 52.Its result becomes easily the heat dissipation design of regenerated electric power charging transistor 52, can save the space and regenerated electric power charging transistor 52 is installed.
(7) current, at the two ends of smmothing capacitor 304, be that the higher two ends of direct voltage are provided with resistance (with reference to earlier figures 7) all the time.Relative therewith, this resistance is not set in the present embodiment.This is because do not need to detect the dc voltage value at smmothing capacitor 14 two ends in the present embodiment.Thus, can prevent from the fixing power loss that causes because of divider resistance etc. from can reduce stand-by electric, realize economizing electrification.
(8) if motor 101 is finished accelerated motion, become at the uniform velocity action, then regenerated electric power savings capacitor 51 becomes the state with the minimum voltage standby.The voltage of the regenerated electric power savings capacitor 51 of this moment is compared with the voltage of smmothing capacitor 14, becomes the value about low 10V.The situation equivalence that the savings ability of the regenerated electric power when this situation is moved with regeneration improves.Thus, with simple on smmothing capacitor situation of appending regenerated electric power savings capacitor in parallel compare, in the present embodiment, regenerated electric power savings ability can be improved about 10%.Thus, can make regenerated electric power savings capacitor 51 low capacityizatioies.
(9) when power supply 11 disconnects, by only making discharge switch 82 closures, and the electric charge of smmothing capacitor 14 and regenerated electric power savings capacitor 51 is discharged.Thus, can make the permanent loss that is caused by discharge resistance 81 is zero.Therefore, can reduce stand-by electric, realize economizing electrification.
(10) obtain following result, that is, flow through the electric current of regenerated electric power charging transistor 52 in when action regeneration, the electric current when absorbing with the common regeneration of existing this use resistance (earlier figures 4) is compared, and is about 1/3～1/2 to get final product (analog result).Thus, even under the situation of using regenerated electric power charging transistor 52, also can alleviate burden to substrate and element, noise etc.
(11) in the situation of the Fig. 4 of the existing example of expression and use regeneration absorption resistance 321 shown in Figure 5 and the system of the regenerated electric power savings discharge that present embodiment is Fig. 1 and Fig. 2, implement the same terms simulation down, the calculating power consumption.Its result, for Fig. 4 of the existing example of expression and regeneration absorption resistance 321 shown in Figure 5, power consumption is about 184 (W).Relative therewith, be the system of the regenerated electric power savings discharge of Fig. 1 and Fig. 2 for present embodiment, the power loss of regenerated electric power charging transistor 52 suppresses to be the low-down value of about 4 (W).In addition, though comprise other structure be the loss etc. of discharge range of regenerated electric power discharge diode 53 interior, as the power loss of regenerated electric power savings discharge part 50 also be about 7 (W) than low value.Thus, can confirm also that in simulation present embodiment has province's electric power effect.
As mentioned above, present embodiment can suppress cost, simultaneously reclaiming electric power and utilizing again effectively.In addition, present embodiment does not need to calculate special computings such as input power capacity, can charging as shown in Figure 7 not carry out voltage transformation like that yet, use 1 current/voltage control element, just realize its purpose as regenerated electric power charging transistor 52 with converter 341.
The load of the middle low capacity till present embodiment is specially adapted to about number kV.
(the 2nd execution mode)
(structure)
The 2nd execution mode is the motor drive that is used for drive motor.
Fig. 3 illustrates the motor drive of the 2nd execution mode.As shown in Figure 3, in the 2nd execution mode, the impulse current inhibition circuit 20 of aforementioned the 1st execution mode and the structure of discharge part 80 are changed.That is, in the 2nd execution mode, impulse current suppresses circuit 20 except resistance 21 and input current by-pass switch 22, also has the diode 23 of impact.In addition, in the 2nd execution mode, cancel the discharge resistance 81 in aforementioned the 1st execution mode, become the structure that on resistance 21, connects discharge switch 82.In addition, so that being provided with circuit 111 ways of connecting, the circuit 118 between discharge switch 82 and the resistance 21 impacts diode 23.The anode that impacts diode 23 is connected on the circuit 118, and negative electrode is connected on the circuit 111.
Utilize this structure, suppress in the circuit 20 at impulse current, shown in usually, the impulse current that when power supply 11 is connected, can utilize resistance 21 to suppress from power supply 11.At this moment, utilize and impact diode 23, the electric current of guaranteeing power supply 11 is via the path of resistance 21 to smmothing capacitor 14 inflows.In addition, behind power supply 11 regular events, can utilize input current by-pass switch 22 that resistance 21 bypasses are got around.
In addition, after power supply 11 is connected,, then impulse current is suppressed impulse current by-pass switch 22 closures of circuit 20, resistance 21 bypasses are got around if the charging of smmothing capacitor 14 and regenerated electric power savings capacitor 51 is finished.Therefore, under common operate condition (power supply 11 is connected the back), because electric current does not flow through resistance 21, so resistance 21 does not produce power consumption.
On the other hand, when being judged as power supply 11 disconnections, the circuit as the electric charge that makes savings in smmothing capacitor 14 and regenerated electric power savings capacitor 51 discharges uses the resistance 21 and the discharge switch 82 that work as discharge resistance.That is, make discharge switch 82 closures, make regenerated electric power savings capacitor 51 begin discharge via resistance 21.At this moment, suppress the diode and the resistance 21 of the input current by-pass switch 22 of circuit 20, guarantee the path that the electric current of regenerated electric power savings capacitor 51 flows through via impulse current.
Thus, the result that regenerated electric power savings capacitor 51 begins to discharge produces potential difference, if the value that monitors surpasses the 1st threshold value between smmothing capacitor 14 and regenerated electric power savings capacitor 51, then regenerated electric power charging transistor 52 starts, the action of beginning regenerated electric power savings.Thus, make smmothing capacitor 14 discharges, smmothing capacitor 14 and regenerated electric power savings capacitor 51 move, so that their current potential reaches balance.On the other hand, in order to keep discharge switch 82 closures, by making regenerated electric power savings capacitor 51 via resistance 21 continuous discharges of working as discharge resistance, and produce potential difference at smmothing capacitor 14 and 51 in regenerated electric power savings capacitor once more, if the value that monitors surpasses the 1st threshold value, then smmothing capacitor 14 is emitted electric charge.By repeating above-mentioned action, can after disconnecting, power supply 11 make smmothing capacitor 14 and regenerated electric power savings capacitor 51 finish discharge rapidly.
(effect and effect)
The resistance that resistance 21 suppresses as the impulse current that is used for impact current suppressing circuit 20 when power supply 11 is connected, and after power supply 11 disconnects, work as the discharge resistance that is used to smmothing capacitor 14 and regenerated electric power savings capacitor 51 are discharged, with 2 kinds of functions.Thus, can efficiently use the circuit impedance of the impulse current inhibition circuit 20 that cost is higher, installing space is bigger originally.
Claims (3)
1. motor drive is characterized in that having:
AC power;
Converter, its AC voltage conversion of utilizing rectifier that aforementioned AC power is exported is direct voltage, utilizes the direct voltage after the conversion, suppresses circuit via impulse current smmothing capacitor is charged;
Inverter, its dc voltage conversion with the output of aforementioned converter are alternating voltage and drive motor; And
Regenerated electric power savings discharge cell, it is put aside the regenerated electric power that produces when the aforementioned motor deceleration,
Aforementioned regenerated electric power savings discharge cell has:
Regenerated electric power savings capacitor, it puts aside aforementioned regenerated electric power;
The current/voltage control element, it flows into charging current in aforementioned regenerated electric power savings capacitor;
Current limiting unit, the electric current of its restriction aforementioned currents voltage controlled element;
The element drives unit, it drives the aforementioned currents voltage controlled element according to the potential difference between the magnitude of voltage of the magnitude of voltage of aforementioned smmothing capacitor and aforementioned regenerated electric power savings capacitor; And
The regenerated electric power arresting element, it realizes being used for electric charge with aforementioned regenerated electric power savings capacitor to the path that aforementioned inverter is emitted when the power run action,
When the regeneration action, carry out following control, promptly, the aforementioned components driver element is according to the potential difference between the magnitude of voltage of the magnitude of voltage of aforementioned smmothing capacitor and aforementioned regenerated electric power savings capacitor, the aforementioned currents voltage controlled element that utilizes the aforementioned currents limiting unit to limit electric current is changed to the zone of saturation from the active region, utilize this current/voltage control element simultaneously, to aforementioned regenerated electric power savings capacitor savings regenerated electric power
When the power run action, carry out following control, that is, the electric charge that will put aside in aforementioned regenerated electric power savings capacitor is emitted to aforementioned inverter via aforementioned regenerated electric power arresting element.
2. motor drive as claimed in claim 1 is characterized in that,
The aforementioned components driver element, potential difference between the magnitude of voltage that the magnitude of voltage and the aforementioned regenerated electric power of aforementioned smmothing capacitor are put aside capacitor surpasses under the situation of the 1st threshold value, begin control to aforementioned regenerated electric power savings capacitor savings regenerated electric power, be lower than in the aforementioned electric potential difference under the situation of the 2nd threshold value littler than aforementioned the 1st threshold value, end control to aforementioned regenerated electric power savings capacitor savings regenerated electric power, when aforementioned regenerated electric power savings capacitor is put aside regenerated electric power, the aforementioned currents voltage controlled element that utilizes the aforementioned currents limiting unit to limit electric current is changed above beginning under the situation of aforementioned the 1st threshold value in the aforementioned electric potential difference to the zone of saturation from the active region.
3. motor drive as claimed in claim 2 is characterized in that,
The aforementioned currents limiting unit, potential difference between the magnitude of voltage that the magnitude of voltage and the aforementioned regenerated electric power of aforementioned smmothing capacitor are put aside capacitor surpasses under the situation of the 3rd threshold value higher than aforementioned the 1st threshold value, improves the degree that the electric current that flows through the aforementioned currents voltage controlled element is limited.
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| CN103684190A (en) * | 2012-09-10 | 2014-03-26 | 发那科株式会社 | Motor control apparatus including at least two resistance discharge units |
| CN106301144A (en) * | 2015-06-29 | 2017-01-04 | 发那科株式会社 | Motor drive |
| CN109802606A (en) * | 2019-01-16 | 2019-05-24 | 西北工业大学 | Drive system of electric automobile bus capacitor energy drainage method |
| CN110098778A (en) * | 2018-01-29 | 2019-08-06 | 发那科株式会社 | Motor drive and determination method |
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| KR102085471B1 (en) * | 2016-04-15 | 2020-03-05 | 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 | Uninterruptible power supply |
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