Sinusoidal modulation control methods and circuits for permanent magnet synchronous motors

Patent metadata

Field	Value
Publication number	US-9317019-B2
Application number	US-201313775434-A
Country	US
Kind code	B2
Filing date	Feb 25, 2013
Priority date	Mar 19, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Disclosed herein are sinusoidal modulation control methods and circuits for PMSM. In one embodiment, a method can include: detecting rotor position information of the PMSM to obtain a rotor position signal and a rotor rotating speed measured value; comparing the rotating speed measured value against a reference rotating speed value to generate an error signal, and generating a first regulating voltage signal based on the error signal using a PI regulator; receiving the rotor position signal and the first regulating voltage signal, and generating a full-wave U-shaped modulation wave by using the rotor position signal as a time reference; generating a second U-shaped modulation wave by multiplying the full-wave U-shaped modulation wave with the first regulating voltage signal; comparing the second U-shaped modulation wave against a triangular wave to generate a PWM control signal that controls a switch of an inverter to regulate a current of the PMSM.

First claim

What is claimed is:

1. A sinusoidal modulation control method for a permanent magnet synchronous motor, the method comprising:
a) detecting rotor position information of said permanent magnet synchronous motor to obtain a plurality of rotor position signals and a rotor rotating speed measured value, wherein said plurality of rotor position signals comprises three-phase Hall signals that correspond to three Hall effect sensors;
b) comparing said rotating speed measured value against a reference rotating speed value to generate an error signal, and generating a first regulating voltage signal based on said error signal using a proportional-integral (PI) regulator;
c) receiving said plurality of rotor position signals and said first regulating voltage signal, and generating a full-wave U-shaped modulation wave by using said plurality of rotor position signals as a plurality of time references;
d) generating a second U-shaped modulation wave by multiplying said full-wave U— shaped modulation wave with said first regulating voltage signal;
e) comparing said second U-shaped modulation wave against a triangular wave to generate a pulse-width modulation (PWM) control signal;
f) controlling a switch of an inverter with said PWM control signal to regulate a current of said permanent magnet synchronous motor; and
g) regulating a rotor position angle by an external enable signal by using said external enable signal to shift said full-wave U-shaped modulation wave left or right of one of said plurality of rotor position signals to change said rotor position angle between a stator magneto-motive force and a rotor magneto-motive force to maximize torque generated at every ampere stator current.

2. The method of claim 1 , wherein said generating said full-wave U-shaped modulation wave comprises:
a) dividing said plurality of rotor position signals into a plurality of time periods; and
b) generating a portion of said full-wave U-shaped modulation wave in each of said plurality of time periods to form said full-wave U-shaped modulation wave.

3. The method of claim 2 , wherein said plurality of time periods comprises six time periods.

4. The method of claim 1 , wherein said detecting said rotor position information comprises using a position-sensorless detector to obtain each of said plurality of rotor position signals.

5. A sinusoidal modulation control circuit for a permanent magnet synchronous motor, wherein said control circuit comprises:
a) a position and speed sensor configured to detect a rotor position information of said permanent magnet synchronous motor to obtain a plurality of rotor position signals, and to generate a rotor rotating speed measured value based on said plurality of rotor position signals, wherein said plurality of rotor position signals comprises three-phase Hall signals that correspond to three Hall effect sensors;
b) a voltage regulating circuit configured to compare said rotating speed measured value against a reference rotating speed value to generate an error signal, and to generate a first regulating voltage signal based on said error signal through a proportional-integral (PI) regulator;
c) a pulse-width modulation (PWM) control circuit configured to receive said plurality of rotor position signals, said first regulating voltage signal, and a triangular wave, and to generate a PWM control signal, wherein said PWM control signal is configured to control a switch of an inverter to regulate a current of said permanent magnet synchronous motor; and
d) wherein a rotor position angle is configured to be regulated by an external enable signal configured to shift said full-wave U-shaped modulation wave left or right of one of said plurality of rotor position signals to change said rotor position angle between a stator magneto-motive force and a rotor magneto-motive force to maximize torque generated at every ampere stator current.

6. The control circuit of claim 5 , wherein said PWM control circuit comprises:
a) a modulation wave generator configured to receive said plurality of rotor position signals and said first regulating voltage signal, and to generate a full-wave U-shaped modulation wave by using said plurality of rotor position signals as a plurality of time references, wherein said full-wave U-shaped modulation wave is multiplied with said first regulating voltage signal to generate a second U-shaped modulation wave; and
b) a comparison circuit configured to compare said second U-shaped modulation wave and a triangular wave to generate said PWM control signal.

7. The control circuit of claim 6 , wherein said modulation wave generator is configured to:
a) divide said plurality of rotor position signals into a plurality of time periods; and
b) generate a portion of said full-wave U-shaped modulation wave in each of said plurality of time periods to form said full-wave U-shaped modulation wave.

Assignees

• Silergy Semiconductor Technology Hangzhou Ltd

Inventors

• Huang Xiaodong

Classifications

• H02P25/023

  Electricity · mapped topic

• G05B11/30

  using pulse-frequency modulation · CPC title

• G05B11/42 Primary

  for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D. · CPC title

• H02P25/03

  with brushless excitation · CPC title