US 2019/0379309 A1 · BRUSHLESS DC MOTOR CONTROL METHOD AND CONTROL DEVICE

Abstract

Implemented are: a first energization step of energizing a motor during a first period in any first excitation pattern at a start of the motor; and a second energization step of energizing the motor, after the first energization step, during a second period longer than the first period in a second excitation pattern advanced from the first excitation pattern by a predetermined angle, for example, 120°, in a rotation instruction direction. After the second energization step, forced commutation is started so that the motor rotates from a rotational position corresponding to the second excitation pattern.

Claims10

Dependent claims

A control method of starting a motor that is a brushless DC motor including no sensor configured to detect a rotational position of a rotor, the control method comprising:

a first energization step of energizing the motor during a first period in any first excitation pattern at a start of the motor;
and
a second energization step of energizing the motor, after the first energization step, during a second period longer than the first period in a second excitation pattern advanced from the first excitation pattern by a predetermined angle in a rotation instruction direction, wherein
after the second energization step, drive of the motor by forced commutation is started so that the motor rotates from a rotational position corresponding to the second excitation pattern.

1 more element

A control device for starting a motor that is a brushless DC motor including no sensor configured to detect a rotational position of a rotor, the control device comprising:

an inverter coupled to a terminal of each coil of the motor and configured to energize the coil by PWM drive;
and
a controller configured to control drive of the motor by controlling the inverter, the controller being configured to control the inverter so that:
at a start of the motor, the motor is energized during a first period in any first excitation pattern;
after the first period, the motor is energized during a second period longer than the first period, in a second excitation pattern advanced from the first excitation pattern by a predetermined angle in a rotation instruction direction;
and after the second period, drive of the motor by forced commutation is started so that the motor rotates from a rotational position corresponding to the second excitation pattern.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/435,577Filed 10 Jun 2019

Priority

JP 2018-11114211 Jun 2018

Published

12 Dec 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02P 6/20
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position;…:…
H02P 1/18
For starting dynamo-electric motors or dynamo-electric converters: for starting an individual DC motor
H02P 6/14
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position;…:…
H02P 6/157
Controlling commutation time: wherein the commutation is function of electro-magnetic force [EMF]

Brushless dc motor control method and control device

Life of this patent

Brushless dc motor control method and control device

Life of this patent

Abstract

Claims10