MOTOR DRIVE APPARATUS AND MOTOR DRIVE METHOD

• US 20180358911A1
• Filed: 02/03/2017
• Published: 12/13/2018
• Est. Priority Date: 02/04/2016
• Status: Active Grant

• Current Assignee: Mitsuba Corporation
• Original Assignee: Mitsuba Corporation
• Inventors: Kojima, Naoki, Kobayashi, Tomofumi, Kawasaki, Atsushi
• Granted Patent: US 10,469,004 B2
• Time in Patent Office: Days
• CPC Class Codes: G05B 19/4015 going to a reference at the beginning of machine cycle, e.g. for calibration
• CPC Class Codes: H02P 2203/03 Determination of the rotor position, e.g. initial rotor position, during standstill or low speed operation
• CPC Class Codes: H02P 6/153 wherein the commutation is advanced from position signals phase in function of the speed
• CPC Class Codes: H02P 6/20 Arrangements for starting H02P6/08 takes precedence

Abstract

A motor drive apparatus includes: a stage determination part that determines a position of the rotor based on a combination of states of a plurality of the output signals; and a power distribution timing determination part which determines that a power distribution timing when power is distributed to the coil is a timing obtained by advancing an angle by an amount that corresponds to a predetermined electric angle in a startup time of the motor, wherein, when a rotation speed of the motor becomes a predetermined rotation speed or more, the power distribution timing determination part determines that a timing when a predetermined period of time elapses since a position of the rotor arrives at a position of an electric angle that corresponds to a displacement amount of an electric angle which is arbitrarily advanced with respect to a predetermined electric angle that is advanced in the startup time is a power distribution timing.

Claims

1. A motor drive apparatus that supplies a current to a plurality of coils and that rotates a rotor of a motor, the motor drive apparatus comprising:

a plurality of detection sensors that are provided at a phase different from each other in a rotation direction of the rotor and that detect a phase in a rotation direction of the rotor and generate an output signal;

a stage determination part that determines a position of the rotor based on a combination of states of a plurality of the output signals; and

a power distribution timing determination part which determines that a power distribution timing when power is distributed to the coil is a timing obtained by advancing an angle by an amount that corresponds to a predetermined electric angle in a startup time of the motor,

wherein, when a rotation speed of the motor becomes a predetermined rotation speed or more, the power distribution timing determination part determines that a timing when a predetermined period of time elapses since a position of the rotor arrives at a position of an electric angle that corresponds to a displacement amount of an electric angle which is arbitrarily advanced with respect to a predetermined electric angle that is advanced in the startup time is a power distribution timing.

2. The motor drive apparatus according to claim 1,

wherein the plurality of detection sensors are arranged to be shifted by an amount that corresponds to a predetermined mechanical angle.

3. The motor drive apparatus according to claim 1,

wherein, when an advanced angle exceeds a threshold value, the power distribution timing determination part determines that a timing when a predetermined period of time elapses since a positon of the rotor arrives at a position of an electric angle at which an amount that corresponds to a predetermined electric angle is switched is a power distribution timing.

5. The motor drive apparatus according to claim 2,

wherein, when an advanced angle exceeds a threshold value, the power distribution timing determination part determines that a timing when a predetermined period of time elapses since a position of the rotor arrives at a position of an electric angle at which an amount that corresponds to a predetermined electric angle is switched is a power distribution timing.

4. A motor drive method that is a drive method of a motor drive apparatus in which a current is supplied to a plurality of coils and a rotor of a motor is rotated and which includes a plurality of detection sensors that are provided at a phase different from each other in a rotation direction of the rotor and that detect a phase in a rotation direction of the rotor and generate an output signal, the motor drive method comprising:

a stage determination step of determining a position of the rotor based on a combination of states of a plurality of the output signals; and

a power distribution timing determination step of determining that a power distribution timing when power is distributed to the coil is a timing obtained by advancing an angle by an amount that corresponds to a predetermined electric angle in a startup time of the motor,

wherein, when a rotation speed of the motor becomes a predetermined rotation speed or more, the power distribution timing determination step determines that a timing when a predetermined period of time elapses since a position of the rotor arrives at a position of an electric angle that corresponds to a displacement amount of an electric angle which is arbitrarily advanced with respect to a predetermined electric angle that is advanced in the startup time is a power distribution timing.