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公开(公告)号：US20210119497A1
公开(公告)日：2021-04-22
申请号：US17137617
申请日：2020-12-30
IPC分类号： H02K1/14 , H02K11/215 , H02K3/32
摘要： An electric motor includes a stator including four split cores, and a rotor having four magnetic poles. Each of the split cores includes a yoke and a tooth. An angle θ1 [degree] formed by a side surface of the tooth and a side surface of the yoke on an inner side in a radial direction of the stator satisfies 90 degrees ≤θ1
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公开(公告)号：US20210111655A1
公开(公告)日：2021-04-15
申请号：US16970010
申请日：2018-03-23
摘要： A motor drive device includes a single-phase inverter that converts a direct-current voltage output from a power supply which is a battery, into an alternating-current voltage. The inverter outputs the alternating-current voltage as an applied voltage to be applied to a motor. The applied voltage is lower when the direct-current voltage is a second voltage lower than a first voltage than when the direct-current voltage is the first voltage. Consequently, a discharge current of the battery is reduced, and the motor drive device capable of reducing an increase in battery temperature can be obtained.
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公开(公告)号：US20180351483A1
公开(公告)日：2018-12-06
申请号：US15757733
申请日：2015-10-30
CPC分类号： H02P6/16 , A47K10/48 , A47L9/2831 , A47L9/2842 , H02M7/5395 , H02P6/28
摘要： A motor control device includes a position sensor that detects a position of a motor, an AD converter that converts an analog signal, which is a detection value of a motor current, into a digital signal, and a control circuit that drives an inverter using an output signal of the AD converter. The control circuit starts the AD converter during a permission period, and performs processing for the analog-digital converter during an electrical half cycle including a permission period. The length of a prohibition period obtained by excluding a permission period from an electrical half cycle decreases as the rotating speed of the motor increases.
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公开(公告)号：US20210052125A1
公开(公告)日：2021-02-25
申请号：US16964684
申请日：2018-03-23
摘要： An electric blower includes a fan, and a board disposed in an airflow path of the fan and including a switching element. The board includes a lead wire projecting into the airflow path.
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公开(公告)号：US20170222572A1
公开(公告)日：2017-08-03
申请号：US15501528
申请日：2014-09-30
发明人： Takashi YAMAKAWA , Koichi ARISAWA , Yuji TAKAYAMA , Shigeo UMEHARA , Tomomi HIGASHIKAWA , Makoto TANIKAWA
CPC分类号： H02M7/06 , H02M1/08 , H02M1/12 , H02M1/42 , H02M1/4225 , H02M2001/0009 , H02M2001/0048
摘要： A power converting apparatus includes a rectifier that converts alternating-current power from an alternating-current power supply into direct-current power, a short-circuit unit that short-circuits the alternating-current power supply via a reactor, and a control unit that controls a short-circuit operation of the short-circuit unit. The control unit changes the number of times of the short-circuit operation during a half cycle of the alternating-current power supply on the basis of a load condition and sets a period from a start to an end of the short-circuit operation during the half cycle of the alternating-current power supply after the change of the number of times of the short-circuit operation to be different from a period from a start to an end of the short-circuit operation during the half cycle of the alternating-current power supply before the change of the number of times of the short-circuit operation.
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公开(公告)号：US20170149352A1
公开(公告)日：2017-05-25
申请号：US15129112
申请日：2014-07-08
CPC分类号： H02M7/06 , H02M1/12 , H02M1/42 , H02M1/4208 , H02M1/4225 , H02M1/44 , H02M7/217 , H02M2001/0009 , H02M2001/0025 , H02M2001/4283
摘要： A power conversion device includes a rectifier circuit that converts an AC power from an AC power supply, into a DC power, a short-circuit unit that short-circuits the AC power supply via a reactor connected between the AC power supply and the rectifier circuit, a control unit that generates a plurality of drive signals to control the short-circuit unit in a half cycle of the AC power supply, and a smoothing capacitor. The control unit stepwise varies threshold values that limit a value of a power-supply current of the AC power supply, in an on-section or an off-section of the plurality of drive signals.
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公开(公告)号：US20220131492A1
公开(公告)日：2022-04-28
申请号：US17431335
申请日：2019-04-11
摘要： A motor driving apparatus for driving a single-phase motor includes an inverter disposed between a battery and the single-phase motor, the inverter applying a first voltage to the single-phase motor at startup and applying a second voltage to the single-phase motor during a normal operation. A stop time period is present after application of the first voltage, application of the first voltage being stopped during the stop time period, and the inverter applies the second voltage after a lapse of the stop time period.
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公开(公告)号：US20180316297A1
公开(公告)日：2018-11-01
申请号：US15770239
申请日：2015-11-02
发明人： Keisuke UEMURA , Yuji TAKAYAMA , Yosuke SHINOMOTO
CPC分类号： H02P6/06
摘要： A motor driving apparatus according to the present invention is a motor driving apparatus that drives an electric blower including a single-phase PM motor. The motor driving apparatus includes: a single-phase inverter that applies an alternating-current voltage to the single-phase PM motor; a rotor position detecting unit 7 that outputs, to an inverter control unit, a position detecting signal which is a signal corresponding to a rotational position of a rotor of the single-phase PM motor; a motor current detecting unit that outputs, to the inverter control unit, a signal corresponding to a motor current flowing to the single-phase PM motor; and the inverter control unit that outputs a driving signal to corresponding one of switching elements of the single-phase inverter on the basis of the position detecting signal and the motor current. The single-phase inverter performs control to increase or decrease effective electric power supplied to the single-phase PM motor, and the air blower changes an air volume by the increase or decrease in the effective electric power.
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公开(公告)号：US20170302217A1
公开(公告)日：2017-10-19
申请号：US15509985
申请日：2014-09-17
摘要： A leak-current detecting unit detects a zero-phase current flowing from an electric-motor driving device, which drives an electric motor with electric power from an alternating-current power supply, or the electric motor to a ground, a leak-current control unit that, on the basis of the zero-phase current detected by the leak-current detecting unit, generates a control signal having cyclicity synchronized with the alternating-current power supply, and an anti-phase generating unit that generates an anti-phase current that is in anti-phase to the zero-phase current on the basis of the control signal from the leak-current control unit, and outputs the anti-phase current.
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公开(公告)号：US20170302150A1
公开(公告)日：2017-10-19
申请号：US15510277
申请日：2014-09-30
发明人： Yuji TAKAYAMA , Takashi YAMAKAWA , Koichi ARISAWA , Shigeo UMEHARA , Tomomi HIGASHIKAWA , Makoto TANIKAWA
CPC分类号： H02M1/08 , H02M1/4208 , H02M1/4225 , H02M7/06 , H02M2001/0048 , H02M2001/4283
摘要： A power converting apparatus includes a rectifier converting alternating-current power from an alternating-current power supply into direct-current power; a short-circuit unit short-circuiting the alternating-current power supply via a reactor; and a controlling unit controlling the short-circuit unit in a half cycle of the alternating-current power supply. A correction amount using inductance of the reactor is set in the controlling unit, and the controlling unit changes, using at least a detection value of a power supply current and the correction amount, an ON time and an OFF time of a plurality of switching pulses, and controls, using changed switching pulses, an ON/OFF operation of the short-circuit unit.
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