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Method for regulating speed of brushless direct current motor supplied with power by four-switch three-phase inverter

A brushed DC motor, three-phase inverter technology, applied in the direction of AC motor control, single motor speed/torque control, electrical components, etc. Fixed problems, low cost, and the effect of achieving stable and reliable control

Inactive Publication Date: 2012-05-30
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a brushless DC motor speed regulation method powered by a four-switch three-phase inverter, which solves the problem that the switching frequency of the hysteresis modulation in the existing brushless DC motor control is not fixed.

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  • Method for regulating speed of brushless direct current motor supplied with power by four-switch three-phase inverter
  • Method for regulating speed of brushless direct current motor supplied with power by four-switch three-phase inverter
  • Method for regulating speed of brushless direct current motor supplied with power by four-switch three-phase inverter

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specific Embodiment approach 1

[0013] Specific implementation mode one: the following combination Figure 1-Figure 13 Describe this embodiment, which is based on a speed loop PI regulator 1, a speed calculation unit 2, a current shape function unit 3, a given current coordinate transformation unit 4, an α-axis current PI regulator 5, and a β-axis current PI regulator 6 , flux linkage tracking PWM unit 7, feedback current coordinate transformation unit 8, four-switch three-phase inverter 9, current sensor 10 and Hall magnetic pole sensor 11 are realized,

[0014] First, the Hall magnetic pole sensor 11 transmits the detected rotor angular velocity signal of the brushless DC motor to the speed calculation unit 2 and the current shape function unit 3 respectively; the current sensor 10 transmits the detected winding current of the brushless DC motor Passed to the feedback current coordinate transformation unit 8;

[0015] Then the speed calculation unit 2 calculates the rotational speed ω of the brushless DC ...

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Abstract

The invention relates to a method for regulating a speed of a brushless direct current motor supplied with power by a four-switch three-phase inverter, and belongs to the field of speed regulation of a direct current motor. The method solves the problem that unfixed switch frequency of hysteresis loop modulation in the control of the conventional brushless direct current motor. The method is realized based on a speed loop PI regulator, a speed calculation unit, a current shape function unit, a given current coordinate conversion unit, an alpha-axis current PI regulator, a beta-axis current PIregulator, a flux linkage tracing PWM unit, a feedback current coordinate conversion unit, a four-switch three-phase inverter, a current sensor and a Hall pole sensor, and adopts rotational speed andcurrent double closed-loop control; an outer loop is a rotational speed ring; the outputs of the rotational speed ring are given as current values; the method multiples the current values by the current shape function unit respectively to realize the preset of three-phase 120-degree symmetrical square-wave current, establishes a current closed loop in a two-phase stationary coordinate system by coordinate conversion, and realizes the control of the four-switch three-phase inverter through the flux linkage tracing PWM unit. The method is used for controlling the speed regulation of the brushless direct current motor.

Description

technical field [0001] The invention relates to a speed regulation method of a brushless DC motor powered by a four-switch three-phase inverter, belonging to the field of DC motor speed regulation. Background technique [0002] Permanent magnet brushless DC motors have been widely used in servo control, robotics, aerospace and other fields due to their remarkable advantages such as simple structure, good speed regulation performance, high power density and reliable operation. In order to reduce costs, four-switch three-phase inverters are used in motor drive systems. The four-switch three-phase inverter uses two series capacitors instead of one power tube bridge arm of the six-switch inverter, which saves power devices and reduces costs. At the same time, when the power tube of a bridge arm of the six-switch inverter fails, certain measures can be taken to construct the four-switch three-phase inverter to continue running, which makes the motor drive system have fault toler...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06H02P6/08H02P6/16H02P6/17
Inventor 赵克安群涛孙力吴凤江孙立志孙光亚
Owner HARBIN INST OF TECH
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