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Induced voltage suppression device, motor system, and power conversion system

A technology of induced voltage and suppression device, which is applied in the direction of control system, motor control, emergency protection circuit device, etc., to achieve the effect of suppressing induced voltage

Inactive Publication Date: 2019-04-30
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In Patent Document 1, the motor is usually driven by PWM, but when some abnormality occurs in the inverter, the three-phase switching element is switched from PWM drive to three-phase short-circuit drive, thereby suppressing the DC power supply voltage to a specified value. voltage range

Method used

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  • Induced voltage suppression device, motor system, and power conversion system
  • Induced voltage suppression device, motor system, and power conversion system
  • Induced voltage suppression device, motor system, and power conversion system

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no. 2 Embodiment approach

[0032] figure 2 It is a circuit diagram of a motor control device according to the second embodiment. exist figure 2 , for the one shown in the first embodiment and the figure 1 The same symbols are attached to the same parts, and descriptions thereof are omitted. In addition, the induced voltage suppression device 3 and figure 1 Similarly, it is composed of a rectification circuit 31 , a DC voltage source 32 , a voltage detection circuit 33 and a short-circuit circuit 34 .

[0033] exist figure 2 Among them, the voltage from the P terminal of the power conversion device 1 passes through the diode D1, and the voltage from the rectification circuit 31 passes through the diode D2, and both are OR-coupled (OR-combined) and input to the DC voltage source 32 .

[0034] The voltage on the higher potential side of the DC voltage from the rectifier circuit 31 in the induced voltage suppression device 3 and the DC voltage from the power conversion device 1 is selected by diodes...

no. 3 Embodiment approach

[0037] image 3 It is a circuit diagram of the motor system concerning 3rd Embodiment. exist image 3 , for the one shown in the first embodiment and the figure 1 The same symbols are attached to the same parts, and descriptions thereof are omitted. In addition, the induced voltage suppression device 3 and figure 1 Similarly, it is composed of a rectification circuit 31 , a DC voltage source 32 , a voltage detection circuit 33 and a short-circuit circuit 34 .

[0038] exist image 3 In , a motor system 20 in which the induced voltage suppressing device 3 and the motor 2 are integrally integrated is shown. The induced voltage suppression device 3 is installed, for example, in a three-phase AC terminal box of the motor 2 or at a connection portion at a coil end, thereby constituting a motor system 20 integrated with the motor 2 . The motor system 20 is installed in a case containing the motor 2, and three-phase wiring is drawn out from the case to be connected to the power...

no. 4 Embodiment approach

[0041] Figure 4 It is a circuit diagram of the power conversion system concerning 4th Embodiment. exist Figure 4, for the one shown in the first embodiment and the figure 1 The same symbols are attached to the same parts, and descriptions thereof are omitted. In addition, the induced voltage suppression device 3 and figure 1 Similarly, it is composed of a rectification circuit 31 , a DC voltage source 32 , a voltage detection circuit 33 and a short-circuit circuit 34 .

[0042] Figure 4 It is a power conversion system 10 in which an induced voltage suppression device 3 and a power conversion device 1 are integrally integrated. The induced voltage suppression device 3 is connected to the three-phase wiring output from the power conversion device 1 , and is integrally integrated with the power conversion device 1 in the power conversion system 10 . The three-phase wiring is connected to the motor 2 .

[0043] In the present embodiment, the induced voltage suppression de...

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Abstract

The present invention addresses the problem of enability to achieve three-phase short-circuit and to suppress induced voltage when a switching element of an inverter does not operate normally due to afailure or the like. An induced voltage suppression device 3 is connected to three-phase wires between a power conversion device 1 and a motor 2 electrically in parallel with respect to the power conversion device 1. A rectifier circuit 31 is configured by a three-phase diode bridge circuit. A DC voltage source 32 is configured by a capacitor C2. A voltage detection circuit 33 detects a voltage across the DC voltage source 32. When a transistor Tr of the voltage detection circuit 33 is turned on, transistors T1-T3 are turned on, whereby a short circuit 34 performs a three-phase short-circuitoperation and suppresses the induced voltage of the motor 2. Since a DC voltage is ensured as a driving source in a self-excited manner due to the induced voltage of the motor 2, the induced voltage suppression device 3 can suppress the induced voltage even when an abnormality occurs in the power conversion device 1.

Description

technical field [0001] The present invention relates to an induced voltage suppression device, a motor system and a power conversion system. Background technique [0002] In recent years, electric vehicles and plug-in hybrid vehicles are gaining popularity. These vehicles use electric motors. The electric motor uses permanent magnets in the magnetic field to operate at high speed. Such a motor equipped with permanent magnets does not require an exciting current, and on the other hand, the induced voltage generated by the magnetic field of the permanent magnets increases in proportion to the rotational speed. According to this phenomenon, when the motor rotates at a high speed above a certain speed, the induced voltage generated exceeds the output voltage of the inverter. Therefore, in the control of the motor at high speed, field weakening control based on PWM control, etc. are used, A method to suppress the output voltage of the inverter. [0003] In Patent Document 1, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/028H02M7/48
CPCH02M7/48H02P29/032H02H7/122H02M1/32H02M7/219H02P6/12
Inventor 行武正刚宫崎英树星野胜洋
Owner HITACHI ASTEMO LTD