PERMANENT MAGNET-TYPE ROTARY ELECTRIC MACHINE AND VEHICLE DRIVE SYSTEM
1 Assignment
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Accused Products
Abstract
A rotor core includes magnet insertion holes embedding permanent magnets and arranged in a substantially U-shape, facing an outer circumferential surface of a rotor, and includes hollow portions formed at both side surface portions in a direction orthogonal to a magnetization direction of the permanent magnets embedded in the magnet insertion holes. A permanent magnet group for each pole having the plurality of permanent magnets includes vent holes passing through the rotor core in a direction of a rotating shaft, between one of the magnet insertion holes in which the permanent magnets are embedded and adjacent one of the magnet insertion holes or between the one of the magnet insertion holes and outer circumferential portions of the rotor core. The vent holes are arranged at positions to form the substantially U-shape together with the magnet insertion holes.
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Citations
17 Claims
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1-7. -7. (canceled)
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8. A railroad-vehicle drive system comprising:
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a permanent magnet-type motor; an inverter that includes switching elements formed of a wide band-gap semiconductor and that drives the permanent magnet-type motor; and a control unit that controls the inverter, wherein the permanent magnet-type motor includes a rotor core in which magnet insertion holes are arranged in a convex shape, facing a center of a rotor, the magnet insertion holes having a plurality of permanent magnets embedded therein for each pole, wherein a permanent magnet group for each pole having the plurality of permanent magnets includes vent holes passing through the rotor core in an axial direction between one of the magnet insertion holes in which the permanent magnets are embedded and adjacent one of the magnet insertion holes or between the one of the magnet insertion holes and outer circumferential portions of the rotor core, and wherein the control unit controls the inverter with a target current constant, in an entire control area up to a maximum number of revolutions of the permanent magnet-type motor. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification