US 11,005,398 B2Granted

Motor drive controller and motor drive control method

AssigneeMINEBEA MITSUMI Inc.

InventorsHiroyuki Kaidu, Youhei Serizawa, Shunsuke Harigae, Zhou Xiao

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Abstract

Provided is a motor drive controller capable of a locking energization operation while preventing increase in temperature of a coil. The motor drive controller includes a motor drive section selectively energizing coils with a plurality of phases of a motor and a locking energization control section. The locking energization control section performs a locking energization operation when the motor is started or restarted and holds a rotor of the motor in a position corresponding to the coil in which the lock current flows. In case of performing the locking energization operation, the locking energization control section switches a locking energization pattern for applying the lock current in the coil from a locking energization pattern when the preceding locking energization operation was performed. The locking energization control section controls the motor drive section so that the lock current flows in the coil in accordance with the switched locking energization pattern.

Claims13

Dependent claims

A motor drive controller comprising:

a motor drive section selectively energizing three-phase coils of a motor having first, second and third coils;
a locking energization control section performing a locking energization operation, in accordance with one of a plurality of locking energization patterns including first and second locking energization patterns, for controlling the motor drive section so that a lock current flows in all of the three-phase coils at the same time when the motor is started or restarted and stopping and holding a rotor of the motor in a position corresponding to the coils in which the lock current is flowing;
and
a forced commutation control section performing a forced commutation operation for controlling the motor drive section by sequentially switching among a plurality of energization patterns in a predetermined order to rotate the rotor after the locking energization control section performs the locking energization operation,
wherein:
before the forced commutation operation, the locking energization control section performs the locking energization operation in accordance with the first locking energization pattern to stop the rotor in said position when the motor is started,
after the locking energization control section energizes the coils with the first locking energization pattern to stop the rotor in said position, the locking energization control section causes the forced commutation control section to perform the forced commutation operation, and
when the forced commutation operation doesn't succeed with the first locking energization pattern, the locking energization control section performs the locking energization operation by energizing the coils in accordance with the second locking energization pattern different from the first locking energization pattern, and causes the forced commutation control section to perform the forced commutation operation to restart rotation of the rotor, wherein
in the first locking energization pattern for stopping and holding the rotor in said position, the current flowing in the first coil is larger than those of the second and third coils, and
in the second locking energization pattern for stopping and holding the rotor in said position, the current flowing in the second coil is larger than those of the third and first coils.

7 more elements

A method of driving a motor by controlling a motor drive section selectively energizing three-phase coils with a plurality of phases of the motor having first, second and third coils, the method comprising:

performing a locking energization operation in accordance with a first locking energization pattern for controlling the motor drive section by energizing the coils with the first locking energization pattern so that a lock current flows in all of the three-phase coils at the same time when the motor is started or restarted and stopping and holding a rotor of the motor in a position corresponding to the coil in which the lock current is flowing;
and
driving the motor by performing a forced commutation operation for controlling the motor drive section by switching among a plurality of energization patterns in a predetermined order, after the locking energization operation is performed,
wherein
before the forced commutation operation, the locking energization control section performs the locking energization operation in accordance with the first locking energization pattern to stop the rotor in said position when the motor is started,
after the locking energization control section energizes the coils with the first locking energization pattern to stop the rotor in said position, the locking energization control section causes the forced commutation control section to perform the forced commutation operation, when the forced commutation operation doesn't succeed with the first locking energization pattern, performing a second locking energization operation by energizing the coils in accordance with a second locking energization pattern different form the first locking energization pattern, and causing the forced commutation control section to perform the forced commutation operation to restart rotation of the rotor,
wherein
in the first locking energization pattern for stopping and holding the rotor in said position the current flowing in the first coil is larger than those of the second and third coils, and
in the second locking energization pattern for stopping and holding the rotor in said position the current flowing in the second coil is larger than those of the third and first coils.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/983,274Filed 18 May 2018
Priority: JP JP2017-10249624 May 2017
Published: US 2018/0342965 A129 Nov 2018
Granted: 11 May 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02P 6/21
Arrangements for starting: open loop start
H02P 1/026
Security devices, e.g. correct phase sequencing: means for delayed starting
H02P 6/24
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position;…:…
H02P
Control or regulation of electric motors, electric generators or dynamo-electric converters