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公开(公告)号：US20190238080A1
公开(公告)日：2019-08-01
申请号：US16312383
申请日：2017-07-05
Applicant: Danfoss Power Electronics A/S
Inventor： Leandro Della Flora , Anton Smith
Abstract: A method and apparatus is described in which a series of short-circuiting pulses is applied to a motor. A current in the motor is determined after one or more of the series of short circuit pulses has completed. The duration of the short-circuit pulses is adjusted depending on the determined current. The method and apparatus may be used within an arrangement for catching a spinning motor.
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公开(公告)号：US10812003B2
公开(公告)日：2020-10-20
申请号：US16312383
申请日：2017-07-05
Applicant: Danfoss Power Electronics A/S
Inventor： Leandro Della Flora , Anton Smith
Abstract: A method and apparatus is described in which a series of short-circuiting pulses is applied to a motor. A current in the motor is determined after one or more of the series of short circuit pulses has completed. The duration of the short-circuit pulses is adjusted depending on the determined current. The method and apparatus may be used within an arrangement for catching a spinning motor.
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公开(公告)号：US10461679B2
公开(公告)日：2019-10-29
申请号：US16064502
申请日：2017-01-04
Applicant: Danfoss Power Electronics A/S
Inventor： Leandro Della Flora , Anton Smith
Abstract: A method and apparatus for catching a rotating motor is described. Switches (typically the lower switches) of an inverter of a motor drive circuit are short-circuited for a brief period of time. The pulses generated by this process are analyzed to determine the speed and direction of rotation of the motor. The pulses are checked to determine whether they are orthogonal. If they are, the motor velocity determination is deemed to be reliable and then motor is magnetized and normal motor control can be resumed. If not, the motor velocity determination is deemed to be unreliable and a magnetization pulse before the velocity determination step is repeated.
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