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Control method of asymmetric four-section SVPWM (space vector pulse width modulation) technology for three-phase motor

A technology of three-phase motor and control method, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., and can solve high switching loss, low input voltage, and the maximum modulation ratio of SVPWM cannot meet application requirements, etc. question

Active Publication Date: 2015-09-16
REGAL BELOIT (CHANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The switching loss of five-segment and seven-segment SVPWM is higher
In some applications that require low input voltage and high motor output speed, the maximum modulation ratio of five-segment and seven-segment SVPWM cannot meet the application requirements

Method used

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  • Control method of asymmetric four-section SVPWM (space vector pulse width modulation) technology for three-phase motor
  • Control method of asymmetric four-section SVPWM (space vector pulse width modulation) technology for three-phase motor
  • Control method of asymmetric four-section SVPWM (space vector pulse width modulation) technology for three-phase motor

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Motor control requires the use of the phase currents of the motor. Resistors are commonly used in low-power motor control to obtain motor phase currents. Such as figure 1 As shown, when the switch Q4 is turned on, a current flows through the resistor R1, and a voltage drop is formed on the resistor R1. This voltage drop is proportional to the motor phase A current. Similarly, when the switch Q5 is turned on, the voltage drop across the resistor R2 is proportional to the B-phase current; when the switch Q6 is turned on, the voltage drop across the resistor R3 is proportional to the C-phase current.

[0023] Step 1: Now we use the number 0 to indicate that the upper bridge is off, and the number 1 to indicate that the upper bridge is on. The upper bridge and the lower bridge of each phase are conducted in a complementary manner. Such ...

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Abstract

The invention relates to a control method of an asymmetric four-section SVPWM (space vector pulse width modulation) technology for a three-phase motor. The three-phase motor comprises a three-phase motor body and six switching devices connected with the three-phase motor body, the six switching devices of the motor with three phases A, B and C have eight switching states 000, 001, 010, 011, 100, 101, 110 and 111 which are represented by eight vector voltages including U1, U2, U3, U4, U5, U6, U7 and U8 respectively, wherein the U1 and the U8 are zero vectors, and the rest U2-U7 are non-zero vectors. The six non-zero vector voltages are divided into vector spaces of six sectors I-VI. The vectors U1, U5 and U7 are used in the sector I, the vectors U1, U7 and U3 are used in the sector II, the vectors U1, U3 and U4 are used in the sector III, the vectors U1, U4 and U2 are used in the sector IV, the vectors U1, U2 and U6 are used in the sector V, and the vectors U1, U6 and U5 are used in the sector VI. The control method has the advantages that switching frequency can be decreased, switching loss is reduced, the maximum modulation ratio can be increased and the like.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a control method of an asymmetrical four-stage SVPWM technology for a three-phase motor. Background technique [0002] Currently, SVPWM technology is the most widely used modulation technology in motor control. The commonly used SVPWM can be divided into two types: five-segment and seven-segment. The switching loss of five-segment and seven-segment SVPWM is higher. In addition, the maximum modulation ratio of the five-segment SVPWM three-resistance current sampling scheme is about 99%; the maximum modulation ratio of the seven-segment SVPWM three-resistance current sampling scheme is about 95%. In some applications that require low input voltage and high motor output speed, the maximum modulation ratio of the five-segment and seven-segment SVPWM cannot meet the application requirements. Contents of the invention [0003] In view of the above problems, the object of the...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P27/12
Inventor 张小群
Owner REGAL BELOIT (CHANGZHOU) CO LTD
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