[특허]Detection of starting motor position in a brushless DC motor

Detection of starting motor position in a brushless DC motor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-007/00
출원번호	US-0414312 (1995-03-31)
발명자 / 주소	Dunfield John C.
출원인 / 주소	Seagate Technology, Inc.
대리인 / 주소	LaRiviere, Grubman & Payne
인용정보	피인용 횟수 : 48 인용 특허 : 0

초록 ▼

A microprocessor-controlled-circuit applies pulses to a standing motor whose rotor position is to be determined. The time required for the injected current to reach a predetermined threshold in a comparator is measured. The pulses are long enough to effectuate an accurate measurement, but not so long that the rotor moves. The pulse is applied twice to each phase, once with a positive polarity and once with a negative polarity, for a total of six measurements. The positive and negative rise times are subtracted from each other to determine whether the positive or negative current rise time was greater. Based upon the differences in the readings for all of the phases, the position of the rotor is known. There are differences in which the difference is zero or negligible. There are at least two methods to determine rotor position when there are ambiguities in the sign of the difference. In one method, the combination of the sign of the rise time difference or its absence plus the magnitude of the rise time can be used along with look-up tables to determine the rotor position. Another method is to resolve a position uncertainty by changing the effective rotor position. This is done by pulsing all three phases actively. Instead of leaving a phase open during pulsing, the third phase is tied high or is tied low. Once start-up ambiguities are resolved, control of acceleration from stand-still through medium speed to constant, nominal speed is provided.

대표청구항 ▼

[ What is claimed is:] [1.] In a brushless DC motor having n phases corresponding to phase windings arranged as a stator and a rotor for n an integer greater than zero, a method for starting the motor in a predetermined direction of rotation of the rotor, the method comprising the steps of:initializing a threshold induced voltage level;mapping electrical position of the rotor including the steps of:pulsing a phase of the n phases with positive current to provide positively induced voltage without appreciably altering the electrical position of the rotor and to provide a positively pulsed phase;measuring a first rise time for the positively induced voltage for the positively pulsed phase to reach the threshold induced voltage level;again pulsing the phase of the n phases but this time with negative current to provide negatively induced voltage without appreciably altering the electrical position of the rotor and to provide a negatively pulsed phase;measuring a second rise time for the negatively induced voltage for the negatively pulsed phase to reach the threshold induced voltage level;determining a difference between the first and the second rise time as measured in each of the measuring steps;determining and storing any sign of the difference;determining if the difference is too small to resolve the electrical position of the rotor;determining and storing, if the difference is too small to resolve the electrical position of the rotor, a magnitude of one of the first and the second rise time associated with the difference; andrepeating the steps comprising the step of mapping until each of the n phases is processed;determining, based on the difference for each of the n phases, whether the electrical position of the rotor is ambiguous; andrecalling and comparing the sign of the difference plus the magnitude of an associated one of the first and the second rise time, if the electrical position is ambiguous, with predetermined stored motor electrical position information to energize at least one of the n phases to start the motor in the predetermined direction of rotation.

이 특허를 인용한 특허 (48)

Grogg, Silvio; Stäheli, Curdin; Ochsenbein, Martin, Brushless DC-motor.
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Leong, Foo Leng; Susanto, Edy; Teoh, Cheng Yong, Determining stuck conditions for electric motors using inductive sensing.
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Lamprecht, Dirk, Method and circuit arrangement for determining the rotor position of an EC motor in the standstill state.
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Swanson,David F., Method and system for determining a rotor position in a wound field DC motor.
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Heidrich, Torsten, Method for starting a brushless d.c. motor.
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Bosch,Volker; Wirnitzer,Bernd, Method for starting a sensorless, electronically commutatable direct current motor.
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Jalbout, Bassam D.; Wong, Brian, Methods and systems for controlling electrical power to DC loads.
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Heydt,Jeffrey A.; Street,David R., Monitoring current in a motor during acceleration to verify motor frequency lock.
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DuLaney,James Wilford, Motor acceleration using continuous sequence of current limit values.
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Ang, Djunaedy Chandra; Ooi, KianKeong; Shen, Liang; Chiang, WingKong, Motor control circuit with adaptive controller path selection for different load conditions.
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Tieu, Triet M., Motor control circuit with adaptive dynamic range selection.
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Yoshida, Kouya; Komatsu, Hayato, Motor controller.
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Ta,CaoMinh; Endo,Shuji; Kobayashi,Hideyuki; Saito,Masahide, Motor drive apparatus and electric power steering apparatus.
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Kuroshima,Shinichi; Igarashi,Yoshiaki; Mori,Hideaki, Motor driving apparatus and motor driving method.
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Kim,Tae duk, Motor driving apparatus, and initial driving method for three-phase motor.
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Jeffrey A. Heydt ; Shawn A. Wakefield, Motor speed observer for data protection in a disc drive.
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Wang, Xiaoyan; Deshpande, Yateendra, PMSM initial position detection system and method.
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Hill, Christopher L.; Korbel, Garry E., Power supply output control apparatus and method.
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Allison, III, Rex L., Sample and hold time stamp for sensing zero crossing of back elecromotive force in 3-phase brushless DC motors.
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Allison, III, Rex L., Sample and hold time stamp for sensing zero crossing of back electromotive force in 3-phase brushless DC motors.
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Allison, III, Rex L., Sample and hold time stamp for sensing zero crossing of back electromotive force in 3-phase brushless DC motors.
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Seki, Kunio; Tsunoda, Toshiyuki; Kokami, Yasuhiko; Kawauchi, Kunihiro, Semiconductor integrated circuit for brushless motor drive control and brushless motor drive control apparatus.
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Marcinkiewicz, Joseph G., Sensorless control system and method for a permanent magnet rotating machine.
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Tieu, Triet M., Sensorless motor control using the rate of change of the inductive rise time.
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Takayama, Seiryu; Maruyama, Takao, Sensorless motor starting system.
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Liu, Ke; Makaran, John, Speed-based open-loop start-up method for brushless DC motor.
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Tieu,Triet Minh, Spindle motor acceleration control.
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Heydt, Jeffrey A.; Street, David R., Spindle motor initialization after a control processor reset condition in a disc drive.
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Viti, Marco, Start procedure for brushless motors.
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El-Sadi Ashraf I. ; Peterson Bruce R. ; Rowe Don, Start-up algorithm for a brushless sensorless motor.
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Vertemara Carlo ; Menegoli Paolo ; Brambilla Massimiliano,ITX, Statistical phase detection and go start-up algorithm.
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Vertemara Carlo ; Menegoli Paolo ; Brambilla Massimiliano,ITX, Statistical phase detection and go start-up algorithm.
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Street, David Ray, Systems and methods for detecting position for a brushless DC motor.
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Jalbout, Bassam D.; Wong, Brian, Traction system for electrically powered vehicles.
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Felts, Wayne Lawrence, Transitioning from startup code to application code during initialization of a processor based device.
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Felts,Wayne Lawrence, Transitioning from startup code to application code during initialization of a processor based device.
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Heydt, Jeffrey A.; Hill, Christopher L., Velocity dependent reference profile for spindle motor acceleration control.
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Detection of starting motor position in a brushless DC motor 원문보기

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