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Voltage vector control method and voltage vector control device of brushless DC (Direct-Current) motor

A technology of DC motor and control method, which is applied in AC motor control, motor generator control, electronic commutation motor control and other directions, can solve the problems of off current and commutation loss, etc. effect of loss

Active Publication Date: 2015-06-03
NO 21 RESERCH INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a brushless DC motor voltage vector control method and device to solve the problems of shut-off current and large commutation loss in the prior art

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  • Voltage vector control method and voltage vector control device of brushless DC (Direct-Current) motor
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  • Voltage vector control method and voltage vector control device of brushless DC (Direct-Current) motor

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] like figure 1 As shown, in the device embodiment of the present invention, the switching device S1 (also referred to as a power device, a power switching device) is composed of a forward switching power tube and a reverse diode, which form a U-phase The upper bridge of the drive circuit. The switching devices S2-S6 are the same switching devices as the switching device S1, and constitute the upper bridge or the lower bridge of the U-phase, V-phase and W-phase drive circuits respectively. For details, see figure 1 , S1 is the upper bridge of the U-phase drive circuit, S4 is the lower bridge of the U-phase drive circuit, S3 is the upper bridge of the V-phase drive circuit, S6 is the lower bridge of the V-phase drive circuit, and S5 is the upper bridge of the W-phase drive circuit , S2 is the lower bridge of the W-phase drive ci...

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Abstract

The invention provides a voltage vector control method and a voltage vector control device of a brushless DC (Direct-Current) motor. The method comprises the following steps: forming 12 voltage vectors in a space vector according to an on state by use of 6 switching devices; when controlling the brushless DC motor, sequentially conducting the 12 voltage vectors; and during vector switching, performing on or off of only one switch. Therefore, during vector switching, on or off of only one switch is performed, so that the problem that while one switching device is turned on, another switching device is turned off in a six-step method can be avoided, and turn-off current and commutation loss can be reduced.

Description

technical field [0001] The invention relates to the technical field of motor voltage control, in particular to a voltage vector control method and device for a brushless DC motor. Background technique [0002] Three-phase brushless DC motors use permanent magnets to generate an exciting magnetic field, usually using Hall elements as position sensors, using a 3-phase full-bridge circuit composed of six power switching devices (also referred to as switching devices) and a specific logic switching method for the motor Provide the required voltage energy. [0003] At present, a simple control method of three-phase brushless DC motor is called 6-step method. In detail, there are 6 switching states in one electrical cycle, so it is called 6-step method. That is, at the same moment, only two switching devices are turned on. In this method, the switching devices that are turned on at the same time are usually only 2 phases. Due to the small number of switching devices, the switch...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P25/02H02P27/12
Inventor 张东宁王思远戴亮于淼
Owner NO 21 RESERCH INST OF CHINA ELECTRONICS TECH GRP