Mitsuba Corporation

Atsushi Kawasaki

Naoki Kojima

Ryo Ohori

Naoki Shioda

Osamu Nakamura

Masaki Hayata

Tomofumi Kobayashi

Takashi Yatsuda

A motor control device for controlling a brushless motor including a rotor and a three-phase armature coil includes: a position detection unit which detects the rotational position of the rotor; a control unit which outputs, in a first control mode or a second control mode, a first drive signal or a second drive signal to an inverter at a current-supply timing based on the rotational position of the rotor; and the inverter which outputs a first current-supply signal or a second current-supply signal to the three-phase armature coil when the first drive signal or the second drive signal is input. For any two of the three phases, a duty value when the duty of the applied voltages is the same is larger in the second control mode than in the first control mode.

Motor control device, motor control method, and motor unit

A motor with speed reduction mechanism is provided with an anti-scattering coverfor grease, which holds grease applied to a mating part MT where a wormand a worm wheelare in engagement with each other, the anti-scattering coverfor grease is provided and closer to an openingthan the worm wheelalong an axial direction of the worm wheel. The anti-scattering coverfor grease has: a first wallextending from the openingtoward a bottomand formed between the wormand a side wallof a speed reduction mechanism housing unit; and a second wallextending in a direction intersecting with the first walland covering the mating part MT from the same side as the openingalong the axial direction of the worm wheel. The first walland the second wallof the anti-scattering coverfor grease hold grease attached to the worm, thereby preventing exhaustion of grease applied to the mating part MT where wormand the worm wheelare in engagement with each other.

Motor with speed reduction mechanism

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.

Motor drive apparatus and motor drive method

Growing community of inventors

Gunma, Japan

Atsushi Kawasaki