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Electric motor drive device

A driving device and motor technology, which is applied in the direction of electrical devices, circuit devices, AC motor control, etc., can solve the problems of reducing the capacity of smoothing capacitors, achieve miniaturization, realize the device structure, and suppress the effect of voltage rise

Active Publication Date: 2019-03-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a limit to reducing the capacity of the smoothing capacitor and realizing miniaturization

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0040] Next, Embodiment 1 of the present invention will be described.

[0041] figure 1 It is a diagram showing a schematic configuration of the motor drive device according to Embodiment 1 of the present invention.

[0042] Such as figure 1 As shown, the motor drive device 100 converts the DC power from the DC power supply 3 into AC power through the inverter 1 and drives the motor 2. The control device 5 of the device 1, and the overvoltage protection unit 6. In addition, the electric motor 2 can perform both a driving operation and a regenerative operation.

[0043] The inverter 1 is a three-phase bridge circuit composed of IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors) Q1 to Q6 as semiconductor switching elements in which diodes are connected in antiparallel, and converts the DC power of the smoothing capacitor 4 into Three-phase AC power and drives the motor 2. In addition, the semiconductor switching elements Q1 to Q6 constituting the ...

Embodiment approach 2

[0120] Next, Embodiment 2 of the present invention will be described. Figure 9 It is a figure which shows the schematic structure of the motor drive apparatus 100a which concerns on Embodiment 2 of this invention.

[0121] In Embodiment 2, the overvoltage protection unit 6 is integrated with the control device 5a. This assumes that the first determination circuit 21 can be arranged close to the voltage measurement point on the main circuit by integrating the inverter 1 and the control device 5a or the like. The other configurations are the same as those of the above-mentioned first embodiment, and the same operation is performed.

[0122] In the second embodiment, since the first determination circuit 21 and the second determination circuit 13 are configured independently, the same effects as those in the first embodiment described above can be achieved.

Embodiment approach 3

[0124] Next, Embodiment 3 of the present invention will be described. Figure 10 It is a figure which shows the schematic structure of the motor drive apparatus 100b which concerns on Embodiment 3 of this invention.

[0125] Such as Figure 10 As shown, the motor drive device 100b drives two motors 2a, 2b, and includes two inverters 1a, 1b that drive the respective motors 2a, 2b. In addition, a smoothing capacitor 4 connected in parallel to the DC power supply 3 , a control device 5 b for controlling the inverters 1 a and 1 b , and an overvoltage protection unit 6 are provided. Moreover, each electric motor 2a, 2b can perform both a drive operation and a regenerative operation.

[0126] The inverters 1a, 1b have the same configuration as the inverter 1 of the first embodiment, and the control device 5b generates gate signals G1a, G1b to control the power running operation and regenerative operation of the inverters 1a, 1b.

[0127] In this case, the maximum regenerative pow...

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PUM

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Abstract

An electric motor drive device (100) is provided with a smoothing capacitor (4) and an inverter (1), and also provided with an overvoltage protection unit (6) for protecting the smoothing capacitor (4) from overvoltage, and a phase short-circuit control unit (12). The overvoltage protection unit (6) is provided with: a discharge circuit (20) in which a discharge resistor (7) and an IGBT (9) are connected in series; and a first determination circuit (21) for determining with a determination delay that a smoothing capacitor voltage exceeds a first set voltage and turning on the IGBT (9). The phase short-circuit control unit (12) is provided with a second determination circuit (13) provided in a control device (5) for drive-controlling the inverter (1) and determining with a determination time longer than the determination delay of the first determination circuit (21) that the smoothing capacitor voltage exceeds a second set voltage lower than the first set voltage, thereby performing a phase short-circuit control on the inverter (1).

Description

technical field [0001] The present invention relates to a motor drive device that drives a motor capable of regenerative operation using an inverter. Background technique [0002] In general, in a motor drive device that drives a motor by an inverter, a smoothing capacitor is provided in parallel with a DC power supply on the input side of the inverter. In addition to reducing the impedance of the main circuit and suppressing surge voltage, the smoothing capacitor also functions to absorb regenerative power and prevent overvoltage of the main circuit during an abnormality. As an example of an abnormality, there is a so-called load dump, that is, during the regenerative operation of the motor, the connection of the input wiring of the inverter is disconnected due to vibration, etc., or the circuit breaker installed on the input side fails, etc., the inverter input side The state in which the connection between the smoothing capacitor and the DC power supply is opened. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
CPCB60L3/003H02M7/5387H02M7/48H02M1/32B60L50/51B60L3/12B60L3/04B60L2240/527B60L2240/529B60L2240/526H02H7/1222H02H9/041Y02T10/70H02P27/06
Inventor 恩田航平竹岛由浩岩蕗宽康家泽雅宏篠原亮杉田英树
Owner MITSUBISHI ELECTRIC CORP
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