Variable frequency control device of brushless DC motor

A DC motor and frequency conversion control technology, which is applied in the field of frequency conversion, can solve problems such as obstacles to the application range, and achieve good speed regulation performance and torque control characteristics.

Active Publication Date: 2007-07-18
HAIER GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above method of using zero-crossing detection to judge the position of the rotor can only be used in the 120-degree frequency conversion mode, and its application range is greatly hindered

Method used

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  • Variable frequency control device of brushless DC motor
  • Variable frequency control device of brushless DC motor

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Embodiment Construction

[0041] Please refer to FIG. 1 , which is a schematic circuit diagram of the first embodiment of the present invention.

[0042] The circuit includes an intelligent frequency conversion unit (IPM) 1; a control unit 2; a brushless DC motor 3; a detection resistor 4.

[0043] The intelligent frequency conversion module 1 mainly includes an inverter composed of six high-power electronic switching devices, and the six high-power electronic switching devices include UP, UN, VP, VN, WP, and WN. Among them, the anodes of UP, VP, and WP are connected to the positive pole of the DC bus, and the cathodes are connected to the three-phase power input lines U, V, and W of the brushless DC motor; the cathodes of UN, VN, and WN are connected to the negative pole of the DC bus, and the anodes are respectively Connect the motor power lines U, V, W. Diodes are respectively connected in antiparallel between the anode and the cathode of the above-mentioned high-power electronic switching device, ...

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PUM

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Abstract

This invention discloses a frequency conversion control device of a brushless DC motor including: a test resistor with the resistor serial on a DC bus for getting the bus current test signal and outputting it, an intelligent conversion module including an inverter composed of large power electronic switch components receiving control of switch signals to alter the logic state of the switch controlled by the switch signal and invert DC bus voltage to three-phase drive current to drive rotation of the motor, a control unit used in receiving test signals output by the test resistor to compute and get three-phase input current of the motor based on said test signal and the switch logic state of the large power electronic switch components in the conversion module and to get the position of the rotor based on the current to generate said switch signal and output it based on the position and the expected rev of the motor.

Description

technical field [0001] The invention relates to the technical field of frequency conversion, in particular to a frequency conversion control device for a brushless DC motor. Background technique [0002] About 50% of the world's electricity consumption is used for driving electric motors. Therefore, improving the efficiency of electric motor driving has become an important method of saving energy and is of great significance for building an energy-saving society. [0003] In the motor drive technology, the common squirrel-cage AC motor has been widely used due to its simple structure. However, the control performance of this motor is poor, and it is difficult to obtain the required speed and torque. For example, the compressors of air conditioners and refrigerators driven by ordinary squirrel-cage alternating current cannot control the speed and torque of the motor, so the cooling capacity of the compressors is the same when they are working, and the cooling of the compress...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P7/292
Inventor 楚人震谷东照程永甫刘俊杰
Owner HAIER GRP CORP
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