BRUSHLESS MOTOR AND CONTROL METHOD

Title:

BRUSHLESS MOTOR AND CONTROL METHOD

Document Type and Number:

WIPO Patent Application WO/2018/043405

Kind Code:

A1

Abstract:

A brushless motor equipped with: a stator having three-phase windings; a rotor having permanent magnets; an inverter that supplies AC current to the three-phase windings by turning on or off multiple switching elements; and a control unit that controls the on or off state of the multiple switching elements by switching an energization pattern between a low-speed energization pattern used for low-speed energization control and a high-speed energization pattern used for high-speed energization control, said energization pattern representing changes in the energization state of each phase of the three-phase windings in accordance with the rotation of the rotor. The control unit switches the energization pattern to the low-speed energization pattern when the rotational speed of the rotor is less than a prescribed threshold value, and switches the energization pattern to the high-speed energization pattern when the rotational speed of the rotor is equal to or greater than the threshold value and a state in which the load on the rotor is within a prescribed range has continued for a prescribed amount of time.

Inventors:

IKEDA TAKESHI (JP)

Application Number:

PCT/JP2017/030751

Publication Date:

March 08, 2018

Filing Date:

August 28, 2017

Export Citation:

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Assignee:

MITSUBA CORP (JP)

International Classes:

H02P6/08; H02P6/15; H02P6/16

Foreign References:

JP2002233183A	2002-08-16
JP2015168273A	2015-09-28
JP2009100526A	2009-05-07
JP2003111469A	2003-04-11

Other References: