US 9,716,454 B2 · Driving circuit and driving method for permanent magnet synchronous motor

Abstract

A driving circuit of a PMSM can include a current sampling circuit configured to generate a current sampling signal by sampling a stator current information of one phase of the permanent magnet synchronous motor; a BEMF circuit configured to receive the current sampling signal and a voltage sampling signal that represents a stator voltage of the phase, to estimate back electromotive force information of the phase, and to output a first voltage signal that represents the back electromotive force information; and a torque regulating circuit configured to generate an angle difference signal by calculating an angle difference between the first voltage signal and the current sampling signal, where the angle difference signal is configured to regulate an amplitude of a first U-shaped modulation wave such that a rotor current is in phase with the first U-shaped modulation wave for maximum torque per ampere.

Claims12

Dependent claims

A driving circuit for a permanent magnet synchronous motor (PMSM), the driving circuit comprising:

a) a current sampling circuit configured to generate a current sampling signal by sampling a stator current information of one phase of said permanent magnet synchronous motor;
b) a back electromotive force (BEMF) circuit configured to receive said current sampling signal and a voltage sampling signal that represents a stator voltage of said phase, to estimate back electromotive force information of said phase, and to output a first voltage signal that represents said back electromotive force information;
and
c) a torque regulating circuit configured to receive said current sampling signal and said first voltage signal, and to generate an angle difference signal by calculating an angle difference between said first voltage signal and said current sampling signal, wherein said angle difference signal is configured to regulate an amplitude of a first U-shaped modulation wave such that a rotor current is in phase with said first U-shaped modulation wave for maximum torque per ampere.

1 more element

A method of driving a permanent magnet synchronous motor (PMSM), the method comprising:

a) controlling a current of said PMSM by controlling switching states of switches in a three-phase inverter;
b) sampling a current through a stator of one phase of said PMSM, to generate a current sampling signal;
c) receiving said current sampling signal and a voltage sampling signal that represents a stator voltage of said phase, and estimating back electromotive force information of said phase, to generate a first voltage signal that represents said back electromotive force information;
and
d) receiving said current sampling signal and said first voltage signal, and obtaining an angle difference signal by calculating an angle difference between said first voltage signal and said current sampling signal, wherein said angle difference signal is configured to regulate an amplitude of an U-shaped modulation wave such that a rotor current is in phase with said U-shaped modulation wave for maximum torque per ampere.

2 more elements

Dependencies are inferred from the claim text.

Driving circuit and driving method for permanent magnet synchronous motor

Life of this patent

Driving circuit and driving method for permanent magnet synchronous motor

Life of this patent

Abstract

Claims12