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Motor drive device

A driving device and motor technology, applied in the direction of AC motor control, electrical components, control systems, etc.

Inactive Publication Date: 2008-09-03
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] However, in a direct conversion device such as a matrix converter, the method of generating PWM pulses is different from that of a converter, so it is difficult to directly apply this prior art to a direct conversion device.

Method used

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Embodiment Construction

[0065] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0066] First of all, Fig. 1 is a block diagram showing the first embodiment of the present invention of the first aspect and the second aspect, and the structural elements having the same functions as those in Fig. The different parts are explained in the center.

[0067] In FIG. 1 , 1 is a matrix converter as an AC-AC direct conversion device, and is composed of a plurality of bidirectional switches directly connecting a power supply 102 and a motor 104 . For example, when the power supply 102 is a three-phase AC power supply and the motor 104 is a three-phase synchronous motor, a total of nine bidirectional switches are connected between the input and output terminals of the three phases. Semiconductor switching elements such as IGBTs with reverse withstand voltage performance are connected in antiparallel.

[0068] 2 is an induced voltage calculation unit for calcu...

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PUM

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Abstract

The invention provides an electric motor driving mechanism. In an AC / AC direct conversion device, the fluctuation caused by the rapid variation of the motor current is not produced, during driving or braking, the motor current can be reduced, and the conversion device can have a safe and continuous operation. A motor drive using AC / AC direct conversion devices such as a matrix converter to drive the motor, includes a current testing unit 106 for testing motor current; a comparison unit 107 for detecting whether the motor current testing value exceeds the limitation level; a induction voltage calculating unit 2 for calculating the induction voltage of the motor; when the comparison unit 107 detects that the motor current testing value exceeds the limitation level, the induction voltage calculated by the induction voltage calculating unit is taken as an output voltage instruction value which is provided to a switch unit 109 and a PWM generating unit 101 of a matrix converter 1.

Description

technical field [0001] The present invention relates to a motor driving device for driving a motor by converting multi-phase AC voltage into a multi-phase AC voltage of arbitrary magnitude and frequency by using an AC-AC direct conversion device such as a matrix converter, and particularly relates to limiting the amplitude of the motor current, thereby A motor drive device capable of continuous operation while preventing overheating and damage to the motor or power conversion device. Background technique [0002] When the electric motor is operated by a power conversion device represented by an inverter and a matrix converter, a protection device is provided to prevent overheating and damage to the motor or the power conversion device. The amplitude of the motor current, and when the motor current exceeds the limit level, all the semiconductor switching elements constituting the power conversion device are turned off to stop the operation. [0003] However, if the operation...

Claims

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Application Information

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IPC IPC(8): H02P27/02H02P27/06
Inventor 佐藤以久也小高章弘
Owner FUJI ELECTRIC CO LTD