Minebea Mitsumi Inc.

Toyota Boshoku Kabushiki Kaisha

Minebea Company, Limited

Wataru Nogamida

Satoshi Hatahara

Masato Aoki

Hiroyuki Kaidu

Seiya Fujimoto

Masaaki Matsubara

Atsushi Tsuzaki

Kiyohisa Nara

Tetsuya Seki

Hiroshi Murahata

Yuya Makino

Shinji Totsuka

Yoshihisa Okabuchi

Yoshiki Sakamoto

Kouji Kebukawa

Yuki Kadono

Takahiro Asami

Syu Hayashi

Takahiro Saito

Takayuki Sugaya

Kentaro Suzuki

A motor includes a shaft, a rotor, a stator including a coil and opposed to the rotor, and a bearing configured to support the shaft. In addition, the motor further includes a first temperature sensor disposed farther toward an outer periphery side than the coil, and a second temperature sensor disposed farther toward an inner periphery side than the coil.

Motor and fan motor

A motor drive control device_includes a target point determination unit_determining a target point P of zero crossing of a coil current Iu of a U phase based on a position detection signal Shu, a current zero crossing point estimation unit_estimating a zero crossing point Q of the coil current Iu of the U phase by detecting a change in a current direction of the coil current Iu of the U phase at a predetermined timing in every cycle of a PWM signal, an adjustment instruction signal generation unit_generating at least one of a phase adjustment instruction signal Sp for instructing phase adjustment of the coil current Iu and a frequency adjustment instruction signal Sf for instructing frequency adjustment of the PWM signal according to a phase difference Δφ between the target point P and the zero crossing point Q such that the phase difference is within a predetermined range, and a drive control signal generation unit_generating a drive control signal Sd based on at least one of the phase adjustment instruction signal Sp and the frequency adjustment instruction signal Sf.

Motor drive control device, motor unit, and motor drive control method

A motor driving control device includes a motor driving unit, a position detection unit, a current detection unit and a control unit. The control unit includes a change detecting means configured to detect a predetermined phase change in the position signal, a first switching means configured to sequentially switch energization patterns of the coils with the plurality of phases based on a timing when the phase change is detected, and a second switching means configured to, in a state where the change detecting means does not detect the phase change, when a value of the drive current becomes a predetermined first threshold or more during a monitoring time period after a timing when the predetermined phase change in the position signal is expected, perform an operation to forcibly switch to a next energization pattern regardless of the timing of switching the energization pattern by the first switching means.

Motor driving control device and motor driving control method

A centrifugal fan that is light in weight and has a structure that restrains vibration are provided. The centrifugal fan includes a resin upper casing, a resin lower casing, an impeller, a motor, and a circuit board. The impeller, the motor and the circuit board are housed between the resin upper casing and the resin lower casing. Radial ribs and a concentric ribs for reinforcing are formed at a bottom surface of a concave part of the lower casing. Resin pins are provided in a standing manner at these rib parts, and the circuit board is fixed to the lower casing by the resin pins.

Centrifugal fan

A motor device includes a motor having coils of three phases and a single-phase coil. The motor device includes a drive circuit of a first system capable of supplying a drive current to the coils of the three phases and a drive circuit of a second system capable of supplying a drive current to the single-phase coil. The drive circuit of the second system is different from the drive circuit of the first system. The drive circuit of the first system includes a three-phase inverter circuit connected to one end of each of the coils of the three phases, and the drive circuit of the second system includes a single-phase inverter circuit connected to both ends of the single-phase coil.

Motor device and motor drive control method

A motor drive controller includes a control unit configured to control a motor drive unit, wherein the motor drive unit includes switching circuits for the three-phase windings, respectively, each of the switching circuits including two switching elements, wherein the control unit is configured to place a first switching element among the two switching elements in an 'on' state for an energization period while placing a second switching element among the two switching elements in an 'off' state, to place the second switching element alternately in the &#x201c;on&#x201d; and &#x201c;off&#x201d; states for the energization period while placing the first switching element in the &#x201c;off&#x201d; state, and to control the second switching element in an overlapping period during which two adjacent windings among the three-phase windings are placed in a same energization state, such that a magnitude of energization of the two adjacent windings changes gradually in a linear or nonlinear fashion.

Motor drive controller for motor with three-phase windings

A VR resolverand an MR sensorare mounted to a shaftThe VR resolverand the MR sensorare formed so as to have a shaft angle multiplier of not less than 2. The difference of the shaft angle multiplier between the VR resolverand the MR sensoris made to be 1. An absolute angle of the shaftis calculated based on a difference between an angle calculated from an output of the VR resolverand an angle calculated from an output of the MR sensorSince the VR resolverand the MR sensorhave a different failure mode, redundancy against failure is reliably obtained.

Angle detecting device

Growing community of inventors

Kakegawa, Japan

Wataru Nogamida