公开(公告)号：US20130234633A1

公开(公告)日：2013-09-12

申请号：US13786135

申请日：2013-03-05

Applicant: DYSON TECHNOLOGY LIMITED

Inventor： Christopher John BATEMAN

IPC: H02P6/18

CPC classification number: H02P6/18 ,  H02P6/26

Abstract: A method of determining the position of a rotor of a permanent-magnet motor. The method includes sequentially exciting and freewheeling a winding of the motor. The winding is freewheeled for a freewheel period in response to current in the winding exceeding a current limit. The method also includes measuring a parameter that corresponds to either the magnitude of current in the winding at the end of the freewheel period or the interval between the start or end of the freewheel period and the time at which current in the winding exceeds the current limit. The measured parameter is then compared against a threshold and the rotor is determined to be at a predetermined position when the measured parameter is less than or greater than the threshold.

Abstract translation: 确定永磁电动机转子位置的方法。 该方法包括顺序激励和续流马达的绕组。 绕组响应于绕组中的电流超过电流限制，自由转动续飞时间。 该方法还包括测量对应于在续流周期结束时绕组中的电流大小或者在续流周期的开始或结束与绕组中的电流超过电流极限的时间间隔的参数 。 然后将测量的参数与阈值进行比较，并且当测量的参数小于或大于阈值时，确定转子处于预定位置。

公开(公告)号：US20130234631A1

公开(公告)日：2013-09-12

申请号：US13786169

申请日：2013-03-05

Applicant: DYSON TECHNOLOGY LIMITED

Inventor： Christopher John BATEMAN

IPC: H02P23/00

CPC classification number: H02P23/00 ,  H02P6/182 ,  H02P6/185 ,  H02P6/26

Abstract: A method of determining the position of a rotor of a permanent-magnet motor. The method uses two different schemes to determine the position of the rotor. A first scheme is used when the rotor rotates within a first speed range, by sequentially exciting and freewheeling a winding of the motor, measuring a parameter that depends on the rate of change of current in the winding, and comparing the parameter against a threshold. A second scheme is used when the rotor rotates within a second speed range, by generating a voltage signal that is proportional to the voltage across the winding, generating a further voltage signal that depends on the rate of change of current in the winding, and comparing the two signals.

Abstract translation: 确定永磁电动机转子位置的方法。 该方法使用两种不同的方案来确定转子的位置。 当转子在第一速度范围内旋转时，通过顺序激励和续流马达的绕组，测量取决于绕组中的电流变化率的参数，以及将参数与阈值进行比较，来使用第一方案。 当转子在第二速度范围内旋转时，通过产生与绕组两端的电压成比例的电压信号，产生取决于绕组中的电流变化率的另外的电压信号，并且比较 两个信号。