US 2006/0132074 A1 · Lead-angle control method and device for operating permanent magnet synchronous motor in flux weakening regions

Abstract

A lead-angle control device according to the present invention includes: a space voltage vector controller calculating effective vector application times necessary for obtaining output voltage vectors of an inverter from stationary-coordinate-system instruction voltage components; a lead-angle compensator comparing the sum of the effective vector application times with a sampling period, and generating lead-angle compensation values; a speed controller generating an instruction current for compensating an error caused by a difference between an instruction speed and a current speed; an instruction current generator which generates a rotating-coordinate-system instruction current component by extracting a lead-angle component at a point where maximum torque-per-ampere can be obtained from the magnitude of the instruction current and performing a mathematical calculation on the magnitude of the instruction current and a lead-angle component; and an instruction voltage generator generating a stationary-coordinate-system instruction voltage component from the rotating-coordinate-system instruction current component.

Claims19

Dependent claims

A lead-angle control method in a motor control system, the method comprising the steps of:

a) calculating and outputting an instruction current for compensating a difference between an instruction speed and a current speed by means of a speed controller;
b) generating and outputting a rotating-coordinate-system instruction current component based on the instruction current by means of an instruction current generator;
c) generating and outputting a stationary-coordinate-system instruction voltage component based on the rotating-coordinate-system instruction current component by means of an instruction voltage generator;
d) calculating and outputting switching times applied to each switching element of an inverter based on the stationary-coordinate-system instruction voltage component by means of a space voltage vector controller;
e) calculating and outputting a lead-angle compensation value by comparing the sum of effective vector application times outputted from the space voltage vector controller with a sampling period by means of a lead-angle compensator;
and
f) compensating a lead-angle component by adding the lead-angle component to the lead-angle compensation value.

4 more elements

A lead-angle control device in a PMSM (permanent magnet synchronous motor) control system, the device comprising:

a space voltage vector controller which calculates effective vector application times T1 and T2 necessary for obtaining an output voltage vector of an inverter from a stationary-coordinate-system instruction voltage component;
a lead-angle compensator which compares the sum of the effective vector application times T1 and T2 with a sampling period Ts, and generates a lead-angle compensation value for compensating a lead-angle component of an instruction current in a flux weakening region according to the comparison result;
a speed controller which generates an instruction current for compensating an error caused by a difference between an instruction speed and a current speed;
an instruction current generator which generates a rotating-coordinate-system instruction current component by extracting from a ROM table a lead-angle component at a point where a maximum torque-per-ampere can be obtained from the magnitude of the instruction current and performing a mathematical calculation on the magnitude of the instruction current and a lead-angle component obtained by compensating the extracted lead-angle component with the lead-angle compensation value;
and
an instruction voltage generator which generates a stationary-coordinate-system instruction voltage component from the rotating-coordinate-system instruction current component.

3 more elements

A lead-angle control device in a motor control system which performs speed control in a flux weakening region by compensating a lead-angle component of an instruction current with a lead-angle compensation value obtained by performing a proportional integral operation on a difference between a sum of effective vector application times and a sampling period.

Dependencies are inferred from the claim text.

Lead-angle control method and device for operating permanent magnet synchronous motor in flux weakening regions

Life of this patent

Lead-angle control method and device for operating permanent magnet synchronous motor in flux weakening regions

Life of this patent

Abstract

Claims19