Toyota Jidosha Kabushiki Kaisha

Sanyo Chemical Industries, Ltd.

Shigeto Takeuchi

Kenji Nakamura

Toshimitsu Takahashi

Keiu Kanada

Tomonari Kogure

Mayumi Takazawa

Shinya Fujibayashi

Mahito Nomura

Masafumi Suzuki

Shogo Nishioka

Hideki Omori

Tomotsugu Taira

A manufacturing method for a rotor core included in a rotor of a motor punches an electromagnetic steel sheet includes punching a plurality of plates for rotor core from an electromagnetic steel sheet; producing a rotor-core precursor by stacking up the plates for rotor core; manufacturing a rotor core by annealing an outer circumferential region of the rotor-core precursor at a first predetermined temperature, and annealing an inner circumferential region of the rotor-core precursor at a second predetermined temperature; the first predetermined temperature being a temperature at which grain growth of crystals of the electromagnetic steel sheet is promoted; and the second predetermined temperature being a temperature at which grain growth of the crystals of the electromagnetic steel sheet is not promoted.

Manufacturing method for rotor core and manufacturing method for motor core

A manufacturing method for a permanent magnet includes the steps of a) producing a permanent magnet (), b) fracturing the permanent magnet () to obtain two or more separate pieces (), and c) restoring the permanent magnet () by fitting the fracture surfaces of adjacent separate pieces () together.

Permanent magnet, manufacturing method thereof, and rotor and IPM motor

A control device controls a switching operation of a switching element such that an AC voltage allowing an AC motor to output torque in accordance with a torque command value is applied to a coil winding of each phase. The control device sets a gate resistance variably between a first pulse voltage at the time of reversal of polarity of the AC voltage and a remaining pulse voltage, in a drive circuit for turning on/off the switching element in response to a switching control signal. By making longer a time period for the first pulse voltage at the time of reversal of polarity to rise, occurrence of partial discharge in a gap between coil windings of respective phases is suppressed.

Electric motor drive device and method of controlling the same

The present invention provides a material for slush molding which is improved in melt properties during slush molding and is excellent in heat resistance, the material being made up of a thermoplastic polyurethane resin (A) the difference between the softening starting temperature (STi) and the softening ending temperature by TMA being from 0 to 30&#xb0; C., and STi being 135 to 200&#xb0; C. The resin (A) has a hard segment with an Mn of 200 to 2000 comprising a diisocyanate having a symmetrical structure, a low molecular-weight diamine having a symmetrical structure, and/or a low molecular-weight diol, the content of which being from 5 to 50 wt %, and a soft segment making up of a high molecular-weight diol with an Mn of 500 to 5000, with the aromatic content being 35 wt % or less and the aromatic ring content x and the urea group content y satisfying&#x2212;0.1+2.5&#x2266;&#x2266;&#x2212;0.1+6.

Polyurethane resin-based material for slush molding

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Toyota, Japan

Shigeto Takeuchi