Asymmetric carrier double-random modulation vibration reduction method of motor

Abstract

The invention discloses an asymmetric carrier double-random modulation vibration reduction method of a motor. The implementation system of the method comprises a voltage source inversion bridge, a permanent-magnet synchronous motor, a rotor position detection module, a coordinate conversion module, a PI regulation module, an asymmetric carrier double-random modulation space vector pulse width modulation (SVPWM) module, wherein the asymmetric carrier double-random modulation SVPWM module comprises a fan-shaped judgment module, a voltage vector calculation module, a zero vector calculation module, a random number generator, a zero vector random allocation module, a carrier generator, a modulation wave generator and a PWM generator, the zero vector random allocation module and the carrier generator are used for achieving double-random mechanism, the zero vector random allocation module is used for achieving random allocation of a zero vector, and the carrier generator is used for achieving randomness of an asymmetric carrier period. By the asymmetric carrier double-random method, the purpose of preventing full-frequency band vibration of the motor can be achieved, and an effective control method is provided for preventing vibration of the motor.

Description

technical field

[0001] The invention relates to a motor vibration reduction method with asymmetrical carrier double random modulation, which belongs to the field of motor control. Background technique

[0002] Permanent magnet synchronous motor PMSM (permanent magnet synchronous motor) has the characteristics of high efficiency, simple structure and high reliability, and is widely used in automobiles, household appliances, medical and aerospace fields. With the development of society, the vibration and noise levels of motors have been listed as an important indicator to measure their quality. PMSM variable frequency speed control system usually uses a voltage type inverter to drive the motor. The harmonic component of the voltage pulse generated by the inverter will cause the motor to generate obvious noise at the switching frequency and its multiplier. By using different control methods to change the distribution of phase current harmonics, the vibration characteristics of...

Examples

Embodiment Construction

[0026] The invention provides a motor vibration reduction method with asymmetrical carrier double random modulation, and the system for realizing the method is as follows: figure 1 As shown, the rotor position detection module is used to detect the rotor position in real time, and send the output value θ to the coordinate transformation module; the phase current i A i B i C After the Clarke transformation module and the Park transformation module, the output value i d i q sent to the PI adjustment module; the Park inverse transformation module outputs u α , u β and sent to the asymmetrical carrier double random SVPWM module; the PI adjustment module respectively sets the given value i dref i qref and feedback value i d i q The difference is PI adjusted and the output value u d , u q Sent to the Park inverse transformation module, u d , u q Output u through the Park inverse transformation module α , u β And sent to the asymmetric carrier double random SVPWM module...

technical field

[0001] The invention relates to a motor vibration reduction method with asymmetrical carrier double random modulation, which belongs to the field of motor control. Background technique

[0002] Permanent magnet synchronous motor PMSM (permanent magnet synchronous motor) has the characteristics of high efficiency, simple structure and high reliability, and is widely used in automobiles, household appliances, medical and aerospace fields. With the development of society, the vibration and noise levels of motors have been listed as an important indicator to measure their quality. PMSM variable frequency speed control system usually uses a voltage type inverter to drive the motor. The harmonic component of the voltage pulse generated by the inverter will cause the motor to generate obvious noise at the switching frequency and its multiplier. By using different control methods to change the distribution of phase current harmonics, the vibration characteristics of...

Examples

Embodiment Construction

[0026] The invention provides a motor vibration reduction method with asymmetrical carrier double random modulation, and the system for realizing the method is as follows: figure 1 As shown, the rotor position detection module is used to detect the rotor position in real time, and send the output value θ to the coordinate transformation module; the phase current i A i B i C After the Clarke transformation module and the Park transformation module, the output value i d i q sent to the PI adjustment module; the Park inverse transformation module outputs u α , u β and sent to the asymmetrical carrier double random SVPWM module; the PI adjustment module respectively sets the given value i dref i qref and feedback value i d i q The difference is PI adjusted and the output value u d , u q Sent to the Park inverse transformation module, u d , u q Output u through the Park inverse transformation module α , u β And sent to the asymmetric carrier double random SVPWM module...

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