公开(公告)号：WO2017174957A3

公开(公告)日：2018-01-18

申请号：PCT/GB2017000052

申请日：2017-03-31

Applicant: POWER DRIVE EFFICIENCY LTD

Inventor： TUREVSKY IGOR ALEXANDER ,  NAIMAN MOSHE HAIM ,  NAIMAN ARTHUR

IPC: H02P1/32 ,  G01R21/06 ,  G01R31/34 ,  H02P3/24 ,  H02P25/18

CPC classification number: H02P1/32 ,  G01R21/06 ,  G01R31/34 ,  H02P3/24 ,  H02P25/184 ,  H02P2207/01

Abstract: Methods and control apparatus for operating a three-phase electric motor are described, in which the motor windings are switched between Star and Delta connections depending on torque requirements, and in which the motor windings are switched to a braking mode when braking torque is required. The electromagnetic torque of the motor is monitored, and a command to switch from Star to Delta is given when the electromagnetic torque rises to reach or exceed a threshold. A command to switch from Delta to Star is given when the electromagnetic torque falls to reach a second threshold. The invention discloses a method of determining instantaneous values for the electromagnetic torque of the motor based on measurements of phase current and phase voltage at particular instants in the voltage cycle. The application further discloses a method of timing the switching operation between Star and Delta configurations, or switching from Star or Delta configuration to a dynamic braking mode, to minimise inrush currents by monitoring the vector relationship between the EMF and the supply voltage and performing switching operations in each motor phase when EMF vector is aligned with the supply voltage vector. The application further discloses switching from Star to Delta or Delta to Star when the torque produced by the motor is substantially equal to the torque requirement of the load to maximise efficiency.

Abstract translation: 描述了用于操作三相电动机的方法和控制装置，其中电动机绕组根据转矩要求在星形和三角形连接之间切换，并且其中当需要制动转矩时电动机绕组切换到制动模式。 监测电机的电磁转矩，并在电磁转矩上升达到或超过阈值时给出从星形切换到三角形的命令。 当电磁转矩降低到第二阈值时，给出从Delta切换到Star的命令。 本发明公开了一种基于电压周期中的特定时刻的相电流和相电压的测量来确定电动机的电磁转矩的瞬时值的方法。 该申请还公开了一种定时星形和三角形配置之间的切换操作或从星形或三角形配置切换到动态制动模式的方法，以通过监测EMF和电源电压之间的矢量关系并执行切换操作来使浪涌电流最小化 在每个电动机阶段当EMF矢量与电源电压矢量对齐时。 该申请还公开了当由电动机产生的转矩基本上等于负载的转矩需求以使效率最大化时，从星形转换为三角形或从三角形转换为星形。