Method and device for controlling linear motor

A technology of linear motors and control methods, applied in the direction of AC motor control, control systems, electrical components, etc., can solve problems such as complex resonance frequency methods, achieve the effects of reducing development difficulty, overcoming slow detection response, and reducing costs

Pending Publication Date: 2017-07-07
ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, it is necessary to address the complex problem of the traditional method of detecting the resonant frequency of a linear compressor, and provide a control method and device for a linear motor that can make the linear compressor naturally reverse and realize the automatic follow-up of the resonant frequency without complex algorithms

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  • Method and device for controlling linear motor
  • Method and device for controlling linear motor
  • Method and device for controlling linear motor

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Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the method and device for controlling the linear motor of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0055] In one embodiment, such as figure 2 As shown, a control method of a linear motor is provided, the method comprising:

[0056] S100, the control unit controls the first switching device VT1 and the second switching device VT2 in the inverter bridge circuit to be turned on, so as to output direct current to the linear motor M in a positive direction.

[0057] S200, the control unit controls the third switching device VT3 and the fourth switching device VT4 in the inverter bridge circuit to be turned on, so as to output a negative dire...

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Abstract

The invention provides a method and a device for controlling a linear motor. The method comprises the following steps: a control unit makes a first switching device and a second switching device in an inverter bridge circuit switched on to output a positive direct current to a linear motor; and the control unit makes a third switching device and a fourth switching device in the inverter bridge circuit switched on to output a negative direct current to the linear motor. The control unit applies positive and negative intermittent direct voltages alternately to the linear motor according to the switch-on/off sequence of the switching devices in the inverter bridge circuit so as to make a linear compressor reverse naturally and follow the resonant frequency automatically. Therefore, there is no need to use a complex algorithm to detect the resonant frequency. The difficulty of development of the control unit is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method and device for controlling a linear motor. Background technique [0002] At present, linear motors and linear compressors mostly use sine wave control, that is, the voltage output from the controller to both ends of the motor is a sinusoidally modulated PWM (Pulse Width Modulation, pulse width modulation) wave, such as figure 1 shown. When using sine wave control, the sine modulation wave frequency given by the controller is the operating frequency of the motor, which needs to be consistent with the resonant frequency of the linear compressor in order to maximize the efficiency of the motor. At present, the position sensor is usually used to detect the resonant frequency of the linear compressor to keep the operating frequency of the linear motor consistent with the resonant frequency of the linear compressor, but the space inside the compressor is limited, so it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/10H02P25/06
CPCH02P23/10H02P25/06
Inventor 区均灌程海珍刘亚祥张东盛
Owner ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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