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公开(公告)号：US20250038626A1
公开(公告)日：2025-01-30
申请号：US18716223
申请日：2022-11-02
Inventor： YASUYUKI YOKOUCHI , AKIHIKO WATANABE
Abstract: A discharge phenomenon of a bearing is detected with high accuracy. Electric motor (10) includes stator (11) including stator core (11a) with winding (11b) wound around stator core (11a), rotor (12) facing stator (11) and including rotating body (13) and shaft (14), first and second bearings (15a, 15b) that are a pair of bearings, first and second brackets (19a, 19b) that are a pair of brackets respectively fix outer rings (17) of the pair of bearings, conductor (21), and current detector (22). Each of the pair of bearings includes inner ring (16) and outer ring (17) and supports shaft (14) with inner ring (16). Conductor (21) electrically connects outer ring (17) of first bearing (15A) and outer ring (17) of second bearing (15B) or stator core (11a). Current detector (22) detects a discharge current flowing through conductor (21) accompanying discharge in first bearing (15A) or second bearing (15B).
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2.发明申请公开(公告)号：US20170163194A1
公开(公告)日：2017-06-08
申请号：US15325309
申请日：2016-01-26
Inventor： MITSUHIRO SAKAMOTO , YASUYUKI YOKOUCHI , DAISUKE SONODA , RYUTA SASAKI
CPC classification number: H02P21/0025 , H02P6/08 , H02P21/00 , H02P21/20 , H02P23/0031 , H02P27/06 , H02P2205/05
Abstract: A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.
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