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公开(公告)号：US10075109B2
公开(公告)日：2018-09-11
申请号：US14337461
申请日：2014-07-22
申请人： ROHM CO., LTD.
发明人： Kenji Sugiura
CPC分类号： H02P6/182 , F04D25/0606 , F04D27/004 , H02P6/15
摘要： A driving device for a brushless DC motor having at least one coil may include a voltage zero crossing detection unit to where an induced voltage becomes zero; a detection period setting unit to set at least one detection period synchronously with the voltage zero crossing point; a coil voltage detection comparator to compare a terminal voltage generated from one end of the coil with a threshold voltage, and generate a coil voltage detection signal indicating a comparison result; a current phase detection unit to generate a phase detection signal indicating a relationship between a phase of a coil current flowing through the coil and a phase of the induced voltage; a driving signal synthesis unit to generate a driving control signal based on the phase detection signal; and a driving circuit to drive the brushless DC motor based on the driving control signal.
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公开(公告)号：US20180219500A1
公开(公告)日：2018-08-02
申请号：US15417240
申请日：2017-01-27
申请人： Ken WONG
发明人： Ken WONG
摘要： A control system for a 2-phase brushless AC motor comprises a position sensor for detecting a position of a rotor of the motor; a polarity detector for detecting a polarity of an AC supply for the motor; a first and second switching circuits respectively coupled to a first and second phase coils of the motor; a current sensor for detecting conduction of the first and second phase coils; and a controller for controlling conduction of the first and second switching circuits according to signals provided by the position sensor, the polarity detector and the current sensor; wherein the control system is embedded in the motor; and the controller is configured to turn on the first switching circuit at appropriate time interval in an AC cycle and turn on the second switching circuit to compensate for another time interval according to the position of the rotor.
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公开(公告)号：US10033252B2
公开(公告)日：2018-07-24
申请号：US14685879
申请日：2015-04-14
摘要： An assembly for operating a DC synchronous machine according to an exemplary aspect of the present disclosure includes, among other things, a controller that is configured to determine a position of a rotating portion utilizing a carrier signal, adjust current supply to a field winding, and monitor and adjust operation of the DC synchronous machine based on various electrical parameters relating to the carrier signal. A method for operating a DC synchronous machine is also disclosed.
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64.发明授权公开(公告)号：US09991827B1
公开(公告)日：2018-06-05
申请号：US15425727
申请日：2017-02-06
发明人： Zachery Scott Buckley , Seil Oh
摘要： A method includes: outputting high side driver gate signals to a plurality of high side driver devices and outputting low side driver gate signals to a plurality of low side driver devices configured to control current supplied to a motor having coils coupled to receive the current at a plurality of phase nodes; at a time approximately prior to an expected zero crossing of a voltage at a selected one of the plurality of phase nodes, disabling the high side driver gate signal and the low side driver gate signal; measuring a back electromotive force (BEMF) voltage and observing a zero crossing time; estimating a next zero crossing time; prior to the next zero crossing time, disabling the high side driver gate signal and the low side driver gate signal and observing the selected one of the phase nodes to form a first sample; and following the next zero crossing time, observing a second voltage at the selected one of the phase nodes to form a second sample.
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公开(公告)号：US20180123488A1
公开(公告)日：2018-05-03
申请号：US15461599
申请日：2017-03-17
申请人： LSIS CO., LTD
发明人： Hak-Jun LEE
摘要： Disclosed is a sensorless control system for a permanent magnet synchronous machine. The sensorless control system includes a counter electromotive force estimation unit configured to estimate a counter electromotive force using a phase voltage reference applied to an inverter and a phase current applied from the inverter to the permanent magnet synchronous machine, and a speed estimation unit configured to estimate an angular velocity and an electrical angle of a rotor of the permanent magnet synchronous machine, and the counter electromotive force estimation unit according to one embodiment of the present disclosure may maintain robust performance at a low speed by modifying some portion of a conventional Luenberger observer.
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公开(公告)号：US09960717B2
公开(公告)日：2018-05-01
申请号：US15359282
申请日：2016-11-22
申请人： MINEBEA CO., LTD.
发明人： Hiroyuki Kaidu
摘要： A motor drive control device, which drives a motor including a plurality of phase coils and a rotor, includes: a motor driver, which outputs a drive signal to the phase coils on a drive control signal; one position sensor, which is provided in a position where a timing of at least one of a rising edge and a falling edge of a rotor position signal is near a zero cross timing of a phase signal of any phase coil; and a controller that: generates the drive control signal based on the phase signal in a case where a rotational speed of the motor is less than a predetermined rotational speed; and generates the drive control signal based on the rotor position signal output from the one position sensor in a case where the rotational speed is equal to or more than the predetermined rotational speed.
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公开(公告)号：US20180109211A1
公开(公告)日：2018-04-19
申请号：US15699249
申请日：2017-09-08
申请人： Black & Decker Inc.
发明人： John D. Cox
CPC分类号： H02P6/12 , B25F5/02 , H02J9/061 , H02M3/10 , H02M7/53875 , H02P4/00 , H02P6/085 , H02P6/14 , H02P6/182 , H02P6/28 , H02P25/184 , H02P25/22 , H02P27/06 , H02P27/08 , H02P2209/01
摘要： A power tool is provided including: an electric brushless direct current (BLDC) motor having rotor and a stator defining phases; a power unit including a first switch circuit connected electrically between a first power supply and the motor, and a second switch circuit connected electrically between a second power supply and the motor; and a controller configured to control a switching operation of the first switch circuit and the second switch circuit to regulate a supply of power from at least one of the first power supply and/or the second power supply to the motor.
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公开(公告)号：US09912268B2
公开(公告)日：2018-03-06
申请号：US14838782
申请日：2015-08-28
发明人： Satoshi Yokoo , Atsuhiro Ichikawa
CPC分类号： H02P6/182 , G01D5/2046 , H02P6/187
摘要： In accordance with an embodiment, a sensor-less detection circuit is provided that includes a first voltage adjustment circuit coupled for receiving an induced voltage and a second voltage adjustment circuit coupled for receiving a common voltage. A differential amplifier has an inverting input terminal coupled to the first voltage adjustment circuit and a noninverting input terminal coupled to the second voltage adjustment circuit. In accordance with another embodiment, a method for detecting a motor rotor position is provided that includes receiving a first back electromotive force that is at a first voltage level and shifting the first back electromotive force from the first voltage level to a second voltage level. The first back electromotive force is filtered to generate a first filtered voltage; and a first motor rotor position signal is generated in response to comparing the first filtered voltage with a reference voltage.
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公开(公告)号：US09912267B1
公开(公告)日：2018-03-06
申请号：US14997283
申请日：2016-01-15
发明人： Edy Susanto , Foo Leng Leong
CPC分类号： H02P6/12 , H02P6/16 , H02P6/182 , H02P29/021
摘要： A circuit comprises a position sensing circuit to sense first and second position states of a rotating object, a first counter storing a first counter value, and a second counter storing a second counter value. The first counter value is incremented when the position states are the same, the second counter value is incremented when the position states indicate that the rotating object has rotated in a direction, and a fault is indicated when either counter value is equal to or greater than their respective limits. A method comprises sensing two position states of a rotating object, incrementing a first counter value when the position states are the same, incrementing a second counter value when the rotating object is determined, using the position states, to have rotated in a direction, and indicating a fault when either counter value is equal to or greater than their respective limits.
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公开(公告)号：US09893665B2
公开(公告)日：2018-02-13
申请号：US14737150
申请日：2015-06-11
发明人： Shih-Chin Yang
CPC分类号： H02P21/0007 , H02P6/18 , H02P6/182
摘要： A system includes a permanent magnet motor having a rotor and a stator. The rotor and the stator have a configuration that causes the motor to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal. The system also includes a motor controller having a sliding-mode observer configured to identify the back-EMF waveform and a position observer configured to estimate at least one characteristic of the motor using the identified back-EMF waveform. The stator may include multiple teeth projecting towards the rotor and multiple conductive windings, where each conductive winding is wound around a single tooth. The rotor may include multiple magnetic poles, where each magnetic pole has a span of about 60° or less. The sliding-mode observer may be configured to receive current measurements associated with three-phase signals and voltage commands generated by the motor controller. The position observer may include a proportional-integral (PI) regulator.
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