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Space vector modulation method and device for three-phase inverter to drive single-phase motor

A space vector modulation, three-phase inverter technology, applied in motor generator control, vector control system, AC motor control and other directions, can solve the problem of inability to directly drive single-phase motor operation.

Pending Publication Date: 2022-01-14
SHANGHAI STEP ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Three-phase inverters are usually used to control three-phase motors, and their three-phase output voltage phases generally differ by 120°, so they cannot be directly used to drive single-phase motors.

Method used

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  • Space vector modulation method and device for three-phase inverter to drive single-phase motor
  • Space vector modulation method and device for three-phase inverter to drive single-phase motor
  • Space vector modulation method and device for three-phase inverter to drive single-phase motor

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Embodiment Construction

[0015] see figure 1 . A space vector modulation method for driving a single-phase motor by a three-phase inverter according to an embodiment of the present invention includes the following steps:

[0016] a. Obtain the overmodulation coefficient according to the given voltage;

[0017] b. Calculate the three-phase duty ratio according to the given voltage, overmodulation coefficient and bus voltage of the three-phase inverter, and limit the calculated three-phase duty ratio;

[0018] c. Control the three-phase inverter with the limited three-phase duty ratio to drive the single-phase motor.

[0019] The space vector modulation method and working principle of the three-phase inverter driving the single-phase motor according to the embodiment of the present invention will be described in more detail below in conjunction with a specific implementation manner.

[0020] figure 2 A schematic diagram of a connection between a three-phase inverter and a unidirectional motor using...

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PUM

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Abstract

The invention discloses a space vector modulation method and device for a three-phase inverter to drive a single-phase motor. The method comprises the following steps: obtaining an overmodulation coefficient according to a given voltage; calculating a three-phase duty ratio according to the given voltage, the overmodulation coefficient and the bus voltage of the three-phase inverter, and limiting the calculated three-phase duty ratio; and controlling the three-phase inverter by using the limited three-phase duty ratio so as to drive the single-phase motor. According to the invention, the three-phase inverter can be controlled to output the voltage required by the single-phase motor so that the control of the single-phase motor is realized.

Description

technical field [0001] The invention relates to motor control technology, in particular to the control technology of single-phase motor. Background technique [0002] Single-phase motors are a common type of motor, especially single-phase asynchronous motors, which are often used in applications such as fans and water pumps. A single-phase motor, although named "single-phase," actually has two-phase windings. Unlike the three-phase current phase difference of 120° of the three-phase motor, the current phase difference of the two-phase winding of the single-phase motor is generally 90°, which can form a circular or elliptical rotating magnetic field to drive the motor to run. [0003] Three-phase inverters are usually used to control three-phase motors, and their three-phase output voltage phases generally differ by 120°, so they cannot be directly used to drive single-phase motors. To realize a three-phase inverter driving a single-phase motor, a space vector modulation me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P27/06
CPCH02P21/14H02P27/06
Inventor 李柏松黄韦陈伟程祥
Owner SHANGHAI STEP ELECTRIC
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