Mitsubishi Electric Corporation

Yoshitaka Ikitake

Satoshi Kawamura

Toshihiko Miyake

Youichi Fujita

Kenta Hatano

Toshiyuki Umemoto

Tomohiro Okumura

Yuki Minakuchi

Daishi Iwasa

Ryoichi Ishihara

A temperature estimation device estimates a drive duty ratio by taking account of the influence of ambient temperature on the energization to a coil part, on the basis of a drive duty ratio and the ambient temperature, and estimates the power consumption of a motor when the coil part is energized with the estimated drive duty ratio, the power consumption of the motor, this power consumption being accompanied by the heat dissipation of the coil part, the power difference between both the power consumption values, the temperature time constant of the coil part, and a temperature variation during a period of the temperature time constant of the coil part, and estimates the temperature variation of the coil part from the ambient temperature on the basis of these estimated values and a last temperature variation of the coil part.

Temperature estimation device, motor control device, and temperature estimation method

A rotor includes coils that are formed by winding wires around bobbins of a core, terminals which are arranged on the bobbins and to which end portions of the wires are hooked, and a commutator arranged at an end portion of the core on a side where the terminals are arranged. The terminals and commutator segments of the commutator are electrically connected via metal pieces extending from the commutator segments and via a wiring board.

Rotor for brush motor and on-vehicle brush motor

A coil temperature estimation unitestimates the coil temperature of a motorfrom the equivalent resistance, heat capacity and thermal resistance of the coil of the motor, which are given in advance, from the applied voltage to the motordetected by a voltage detector, and from a duty ratio command value input from the outside. When a temperature abnormality deciding unitdecides that the coil temperature is not normal, a duty limiterlimits the duty ratio command value at a low value and outputs it to a FET driving circuit

Motor control device

A motor positioning structure is constructed by providing a plurality of positioning pinsfor positioning a circuit boardon a caseof a circuit main bodyand also providing receiving holesfor receiving the positioning pinsin a frameon the side of a stator in a motor main body

Growing community of inventors

Tokyo, Japan

Yoshitaka Ikitake