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公开(公告)号：US20160241177A1
公开(公告)日：2016-08-18
申请号：US14946671
申请日：2015-11-19
发明人： Minoru KUROSAWA , Kichiya ITAGAKI , Seigi ISHIJI
CPC分类号： H02P23/0077 , H02P6/10 , H02P29/00 , H02P29/50
摘要： The present invention is intended to reduce noise and vibration of a motor. A first duty correction circuit generates a first corrected duty instruction value which changes with an increment same as an increment of a duty instruction value and in which an offset value as a constant is reflected. A second duty correction circuit generates a second corrected duty instruction value which changes with an increment different from an increment of the duty instruction value. A selector outputs, as the corrected duty instruction value, either one of the first corrected duty instruction value and the second corrected duty instruction value in accordance with a magnitude relation between the duty instruction value and a duty reference value.
摘要翻译： 本发明旨在减少电动机的噪声和振动。 第一占空比校正电路产生第一校正占空指令值，其以与占空指令值的增量相同的增量变化，并且其中反映作为常数的偏移值。 第二占空比校正电路产生以与占空指令值的增量不同的增量改变的第二校正占空比指令值。 A选择器根据占空指令值和占空比基准值之间的大小关系，输出第一校正占空指令值和第二校正占空指令值中的任何一个作为校正占空指令值。
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2.发明申请公开(公告)号：US20180096704A1
公开(公告)日：2018-04-05
申请号：US15717035
申请日：2017-09-27
发明人： Minoru KUROSAWA , Kichiya ITAGAKI , Seigi ISHIJI
CPC分类号： G11B19/2063 , G11B5/54 , G11B19/04 , G11B19/2081 , G11B21/02 , G11B21/12
摘要： A control device is provided which can perform a retraction operation of a head included in a disk storage device with lower power consumption.The control device of the disk storage device includes a control unit that controls a motor and retracts the head from over a disk to a ramp mechanism when power supply is shut down, an acquisition unit that acquires information related to a moving distance of the head that retracts to the ramp mechanism, and a calculation unit that calculates the moving distance of the head based on the information acquired by the acquisition unit. The control unit switches an operation of the motor from a first retract operation to a second retract operation when determining that the head reaches a first position after passing through an inclined surface of the ramp mechanism based on the moving distance calculated by the calculation unit.
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公开(公告)号：US20190006964A1
公开(公告)日：2019-01-03
申请号：US16004494
申请日：2018-06-11
发明人： Minoru KUROSAWA , Seigi ISHIJI
CPC分类号： H02P3/12 , G11B5/54 , G11B15/46 , G11B19/2009 , G11B19/28 , H02P3/22 , H02P6/24 , H02P7/025 , H02P7/29 , H02P7/293 , H02P29/68 , H02P2205/01
摘要： A PWM modulation circuit controls low-side transistors of three phases (u, v, and w) all to be into an ON state, when a brake current flows, controls, in a period in which a brake current flows in one phase, a transistor for sensing (u, v, and w) of this one phase to be into an ON state, and controls, in a period of two phases, the transistor for sensing (u, v, and w) of three phases to be into an OFF state. When the brake current is to flow, sense-phase control circuits of three phases controls a transistor for sensing (u, v, and w), in a phase in which the brake current is in a sink direction, to be into an ON state, and controls the transistor for sensing (u, v, and w) in a phase in which it is in an opposite direction, to be into an OFF state.
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公开(公告)号：US20210273589A1
公开(公告)日：2021-09-02
申请号：US17148402
申请日：2021-01-13
发明人： Seigi ISHIJI , Minoru KUROSAWA
IPC分类号： H02P6/182 , H02M7/5387 , H02P6/18 , H02P6/28
摘要： A gate drive semiconductor device includes: external terminals to which PWM control signals are supplied; external terminals outputting a drive signal for driving a three-phase BLDC motor; external terminals to which the counter electromotive voltage generated by driving the three-phase BLDC motor is supplied; a zero-cross determination unit generating an interrupt signal indicating timing at which the counter electromotive voltage intersects with a midpoint potential of the three-phase BLDC motor based on the PWM control signal and the counter electromotive voltage; and an external terminal outputting the interrupt signal.
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