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公开(公告)号：US20200313574A1
公开(公告)日：2020-10-01
申请号：US16827870
申请日：2020-03-24
发明人： Makoto MURAKAMI
摘要： A control method of a piezoelectric driving device which includes a vibrator including a piezoelectric element and vibrating by application of a drive signal to the piezoelectric element, a driven unit moving by the vibration of the vibrator, a drive signal generation unit generating the drive signal based on a pulse signal, the control method including: stopping the application of the drive signal to the piezoelectric element at the time when a driving speed of the driven unit is a reference speed, in a case of stopping driving of the driven unit.
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公开(公告)号：US20220166298A1
公开(公告)日：2022-05-26
申请号：US17534570
申请日：2021-11-24
发明人： Makoto MURAKAMI
IPC分类号： H02K21/24 , B25J9/12 , H02K1/2793 , H02K3/28
摘要： A rotary motor includes a first stator including a plurality of first cores and a first coil, a signal of any one of a first phase, a second phase, and a third phase forming a three-phase alternating current flowing to the first coil, a second stator including a plurality of second cores and a second coil, a signal of any one of the first phase, the second phase, and the third phase forming the three-phase alternating current flowing to the second coil, and a rotor disposed between the first stator and the second stator via a gap and including a plurality of magnets arranged side by side in a circumferential direction around a rotation axis. A center of gravity of the first core around which the first coil to which the signal flows is wound and a center of gravity of the second core around which the second coil to which a signal of the same phase as the phase of the signal flowing to the first coil flows is wound are shifted from each other in the circumferential direction.
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公开(公告)号：US20210288595A1
公开(公告)日：2021-09-16
申请号：US17200934
申请日：2021-03-15
发明人： Makoto MURAKAMI
摘要： A control unit of a piezoelectric drive device calculates a maximum deceleration α applied to a driven part by the piezoelectric drive device using a friction force F2max between the piezoelectric drive device and the driven part and a mass m of the driven part, calculates a distance Ln to a target position from a present position of the driven part detected by a position sensor, calculates a reference velocity vth of the driven part using the maximum deceleration α and the distance Ln from the present position of the driven part to the target position, calculates a velocity vn of the driven part from a temporal change of the present position of the driven part detected by the position sensor, and performs control to apply a drive force from the piezoelectric drive device to the driven part when the present velocity vn of the driven part is lower than the reference velocity vth, and apply a brake force from the piezoelectric drive device to the driven part when the present velocity vn is equal to or higher than the reference velocity vth.
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公开(公告)号：US20220149683A1
公开(公告)日：2022-05-12
申请号：US17512699
申请日：2021-10-28
发明人： Hiroshi KOEDA , Kuniaki TANAKA , Shigekazu TAKAGI , Hiroshi WADA , Michio SATO , Hideaki NISHIDA , Makoto MURAKAMI
IPC分类号： H02K1/2793 , H02K15/03 , H02K16/02 , H02K21/24
摘要： A rotary motor includes a stator and a rotor configured to rotate around a rotation axis. The rotor includes a frame including a first surface facing the stator and a plurality of first recesses arrayed along a circumferential direction around the rotation axis and opened on the first surface, the frame being formed in an annular shape, main magnets disposed in the first recesses or among the first recesses, and sub-magnets disposed in the first recesses when the main magnets are disposed among the first recesses and disposed among the first recesses when the main magnets are disposed in the first recesses.
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