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公开(公告)号：US20230268855A1
公开(公告)日：2023-08-24
申请号：US17676610
申请日：2022-02-21
摘要： In accordance with at least one example of the description, a circuit is adapted to be coupled to a coil of a motor via an H-bridge circuit. The circuit includes a duty sensor, a subtractor, and a comparator. The duty sensor is coupled to the coil of the motor and is configured to provide raw run duty data responsive to a coil current through the coil. The subtractor is coupled to the duty sensor and is configured to provide a differential duty signal responsive to a stall duty signal and a run duty signal obtained using the raw run duty data. The comparator is coupled to the subtractor and is configured to provide a stall signal indicative of a stall condition for the motor responsive to the differential duty signal and a threshold value.
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公开(公告)号：US20200295685A1
公开(公告)日：2020-09-17
申请号：US16812635
申请日：2020-03-09
申请人： DENSO CORPORATION
发明人： Kenta IMAMIYA , Mitsuru AOKI , Yasuhiko HARADA
IPC分类号： H02P8/38
摘要： A bipolar stepper motor driving device drives a stepper motor including stator coils having plural phases. The bipolar stepper motor driving device includes H-bridge circuits, a current detector, a control circuit, and a re-turning-on instruction unit. The H-bridge circuits are provided correspondingly to the phases of the respective stator coils. The current detector detects current flowing in the stator coils. The control circuit executes drive control of the H-bridge circuits. The re-turning-on instruction unit commands the control circuit to switch into a short-circuited state a stator coil which has shifted from an energized state to an off-state among the stator coils, on a condition that an absolute value of a reverse current detected by the current detector has changed from a value larger than a threshold current value to a value smaller than the threshold current value.
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公开(公告)号：US10520898B2
公开(公告)日：2019-12-31
申请号：US15460651
申请日：2017-03-16
发明人： Yuta Saito
摘要： A driving processor for driving a motor having a rotor and one or more coils for rotating the rotor is configured to generate a detection pulse for detecting whether or not the rotor has rotated; cause the generated detection pulse to be applied to at least one of the one or more coils; receive a signal indicating a detected value of current flowing in the at least one of the one or more coils after the detection pulse has been outputted to the at least one of the one or more coils; and determine whether or not the rotor has rotated to one or more prescribed positions on the basis of the detected value of current.
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公开(公告)号：US20190332065A1
公开(公告)日：2019-10-31
申请号：US16506955
申请日：2019-07-09
发明人： Yuta SAITO
摘要： An electronic timepiece, including: a motor having a rotor and at least two coils, the rotor being configured to rotate to a plurality of prescribed positions; and a driving processor for driving the motor, the driving processor being configured to: generate a detection pulse for detecting whether or not the rotor has rotated; cause the generated detection pulse to be applied to at least one of the at least two coils; receive a signal indicating a detected value of current flowing in the at least one of the at least two coils that is generated in response to the detection pulse outputted to the at least one of the at least two coils; and determine whether or not the rotor has rotated to one of the plurality of prescribed positions on the basis of the detected value of current.
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公开(公告)号：US10461676B2
公开(公告)日：2019-10-29
申请号：US15685471
申请日：2017-08-24
发明人： Philippe Guyon , Daniel Garcia , Ralf Jahnig , Markus Luig
摘要： A Method for detecting stalling of an electric stepper motor (18), with the following steps is shown: a) samples of the voltage at a coil of the stepper motor (18) are taken continuously or in regular intervals, b) a deviation value is determined corresponding to the deviation between the measured voltages of the two samples, and c) the deviation value is used to determine whether the electric motor (18) is stalling. Further, a stepper motor and a heating, ventilation and/or air conditioning system is shown.
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6.发明申请公开(公告)号：US20190222151A1
公开(公告)日：2019-07-18
申请号：US16240893
申请日：2019-01-07
发明人： Kaishi Ohashi
IPC分类号： H02P8/12 , H02K29/08 , H02K11/215 , H02P8/38 , H02K37/14
摘要： A motor control apparatus for reducing the influence of magnetic fluxes from yokes on the switching of an energization direction. A rotor is rotatable and has a magnet. The magnet is circumferentially divided into a plurality of portions alternately multipolar magnetized to different poles. The coils are energized to excite the magnetic pole portions. Magnetic sensors output signals when detecting magnetic fluxes. Comparators output comparison result signals indicative of results of comparison between the output signals from the magnetic sensors and reference signals. A control circuit controls energization directions of the coils based on the comparison result signals. The control circuit changes the values of the reference signals according to a relationship between the polarities of the magnetic pole portions.
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公开(公告)号：US10298158B2
公开(公告)日：2019-05-21
申请号：US15105159
申请日：2015-01-06
发明人： Hiroshi Hibino , Nobuki Kitano
IPC分类号： H02P6/12 , H02P21/18 , H02P25/024 , H02P8/38 , H02P21/00
摘要： A feedback amount calculation unit uses a deviation of a current from its command value or a deviation of an air-gap flux from its command value to calculate a feedback amount. A voltage error calculation unit calculates a variation range of a voltage error between a voltage value based on a voltage equation of the electric motor and a voltage command. The presence or absence of step-out of the electric motor is determined by comparison between the variation range of the voltage error and the feedback amount.
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公开(公告)号：US20180088533A1
公开(公告)日：2018-03-29
申请号：US15667370
申请日：2017-08-02
发明人： Yuta SAITO
摘要： A stepping motor includes: a rotor; and a stator including an opening accommodating the rotor, a first side yoke extending from the opening in a first direction, a second side yoke extending from the opening in a second direction that is a direction opposite to the first direction, and one or a plurality of coils magnetically coupled to the first side yoke or the second side yoke. Assuming a direction orthogonal to the first direction and the second direction is defined as a third direction, a first recess is formed in an outer circumference of the stator at a position rotated from the third direction toward the second direction by a prescribed first angle and a second recess that determines a stable resting position of the rotor is formed at a position rotated from the second direction toward the third direction by a prescribed second angle.
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公开(公告)号：US20180062550A1
公开(公告)日：2018-03-01
申请号：US15685471
申请日：2017-08-24
发明人： Philippe Guyon , Daniel Garcia , Ralf Jahnig , Markus Luig
摘要： A Method for detecting stalling of an electric stepper motor (18), with the following steps is shown: a) samples of the voltage at a coil of the stepper motor (18) are taken continuously or in regular intervals, b) a deviation value is determined corresponding to the deviation between the measured voltages of the two samples, and c) the deviation value is used to determine whether the electric motor (18) is stalling. Further, a stepper motor and a heating, ventilation and/or air conditioning system is shown.
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公开(公告)号：US20170117836A1
公开(公告)日：2017-04-27
申请号：US14923778
申请日：2015-10-27
摘要： A driving device includes a case with a cover mounted thereto. A transmission device is received in the case and has a stepper motor and a gear reduction unit which includes multiple gears engaged with each other. The stepper motor drives the gear reduction unit which is connected to an object. A circuit board is connected with the transmission device and provides power to the stepper motor and controls the stepper motor. A sensing device has a sensor and a detector which is connected to one of the gears of the gear reduction unit. When the gear reduction unit drives the detector to pass the sensor, the sensor sends a signal to the circuit board which keeps on providing the power to the stepper motor. When no signal is sent to the circuit board by the sensor, the circuit board cuts off the power to the stepper motor.
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