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Electric motor driving device

A driving device and motor technology, applied in motor control, electronic commutation motor control, single motor speed/torque control, etc., can solve problems such as unstable startup, increased torque fluctuation, and unstable driving.

Inactive Publication Date: 2006-11-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the load current fluctuates greatly during start-up, changing the current phase angle by selecting the optimal current phase angle will cause instability during start-up
In addition, when the current phase angle is set to an optimal value, if the current phase angle changes greatly, the torque fluctuation will increase, and the drive will become unstable.

Method used

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Embodiment Construction

[0027] Embodiments of the motor drive device of the present invention will be described below with reference to the drawings.

[0028]

[0029] Fig. 1 is a block diagram showing the structure of a motor drive device according to the present invention. The motor drive device is composed of a rectifier circuit 2 that changes the AC voltage of the AC power supply 1 into a DC voltage, an inverter circuit 6 that converts the DC voltage output by the rectifier circuit 2 into a desired AC voltage output as the driving voltage of the motor 4, and The control circuit 30 which controls the inverter circuit 6 is comprised.

[0030] The inverter circuit 6 is constituted by a pair of switching elements 5a to 5f and freewheeling diodes 6a to 6f.

[0031] The control circuit 30 includes a base driver 10, a sine wave voltage output unit 11, a current control unit 12, a current command generation unit 13, a speed control unit 14, a carrier frequency switching unit 15, a current control gain...

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Abstract

A motor driving apparatus includes current detecting means (7a, 7b) for detecting a current flowing in a motor (4), current control means (12) for controlling the current flowing in the motor (4) to a predetermined value with reference to the detected current, and current control gain adjusting means (16) for changing a control gain in the current control means (12) according to an amplitude of the current flowing in the motor (4). <IMAGE>

Description

technical field [0001] The present invention relates to a motor drive device for driving a motor such as a brushless DC motor at an arbitrary rotational speed. Background technique [0002] In recent years, the need to reduce power consumption has increased from the viewpoint of global environmental protection in devices that drive motors such as compressors in air conditioners. As one of the power saving technologies, an inverter or the like that drives a high-efficiency motor such as a brushless DC motor at an arbitrary frequency has been widely used. [0003] As such a drive technology, a current sensor has been developed to detect the current flowing in the motor winding, and use the detected current value to estimate the position of the motor rotor (the estimation of the rotor position has a method of estimating the induced voltage of the motor (see Japanese Patent Application Laid-Open). 2000-350489 Bulletin)), the technology of sine wave drive. In such a method, hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P6/06H02P6/18
CPCH02P6/085Y10S388/9072
Inventor 松井敬三
Owner PANASONIC CORP