公开(公告)号：US4447788A

公开(公告)日：1984-05-08

申请号：US438945

申请日：1982-11-03

申请人： Johann Mundt ,  Horst Kasper ,  Eckhard Pritsch

发明人： Johann Mundt ,  Horst Kasper ,  Eckhard Pritsch

IPC分类号： H02P5/74 ,  H02P23/00 ,  H02P25/024 ,  H02P5/46

CPC分类号： H02P23/0077 ,  H02P25/024 ,  H02P5/74 ,  Y02P80/116

摘要： A method for optimizing the power input to a plurality of parallel connected hysteresis motors wherein a three phase alternating voltage source jointly supplies the motors with an adjustable operating voltage. The method includes measuring, during the operation of each motor, the phase angle difference between motor voltage and motor current and determining the power factor therefrom for each motor. The effective current value of each motor is measured during operation and is combined with the power factor to obtain the active current for each motor. An active current limit value at which each motor transitions from synchronous to asynchronous operation is measured once and stored for each motor prior to commencement of continuous synchronous operation. After the motors reach synchronous speed at rated voltage, the control voltage is adjusted to reduce the supply voltage to an optimum working point just above the voltage level at which a first one of the parallel connected motors begins to transition from synchronous to asynchronous operation. The active current of each motor is then compared with its associated limit value to determine whether it is operating synchronously or asynchronously. The control voltage of the voltage source is thereafter regulated for increasing the supply voltage to the rated voltage value when it is determined that one of the motors is operating asynchronously and for decreasing the supply voltage to the optimum working point when the motors are all determined to be operating synchronously.

摘要翻译： 一种用于优化对多个并联连接的磁滞马达的功率输入的方法，其中三相交流电压源联合地为电动机提供可调节的工作电压。 该方法包括在每个电动机的操作期间测量电动机电压和电动机电流之间的相位角差，并且为每个电动机确定其功率因数。 每个电机的有效电流值在运行期间测量，并与功率因数组合，以获得每个电机的有功电流。 在连续同步运行开始之前，测量每个电动机从同步转换到异步操作的有效电流极限值一次并存储给每个电动机。 电机在额定电压下达到同步转速时，调整控制电压，将电源电压降低到正好高于并联电机第一个并联电动机从同步转换到异步运行的电压水平的最佳工作点。 然后将每个电动机的有效电流与其相关联的极限值进行比较，以确定其是否同步或异步运行。 此后调节电压源的控制电压，当确定其中一个电动机异步工作时，将电源电压提高到额定电压值，并且当电动机全部确定为 同步运行。

公开(公告)号：US06392378B1

公开(公告)日：2002-05-21

申请号：US09511676

申请日：2000-02-23

申请人： Horst Kasper ,  Johann Mundt

发明人： Horst Kasper ,  Johann Mundt

IPC分类号： H02P146

CPC分类号： H02P5/00 ,  Y02P80/116

摘要： In a method of operating and controlling hysteresis motors energized by a three-phase power supply and individually monitored by an operating monitoring system, whereby the effective power output of the individual motors is determined and the three-phase voltage is changed if the effective power output deviates from a predetermined range, the hysteresis motors are first energized at an intermediate range voltage until they reach nominal speed and are then running at synchronous speed, the supply voltage is then increased to an upper range, where the remanent magnet pole strength is impressed on the armature and then reduced to a lower range for continuous operation of the motors, the power output of the individual motors is monitored and, if it drops below a threshold indicating a switch to asynchronous operation, the operating voltage is again increased to the intermediate range for renewed synchronization.

摘要翻译： 在由三相电源供电并由操作监控系统单独监控的滞环电动机的运行和控制方法中，确定各个电动机的有效功率输出，如果有效功率输出 偏离预定范围，磁滞电动机首先在中间范围电压下通电直到它们达到额定转速，然后以同步速度运行，然后将电源电压增加到上限，其中剩余磁极强度被施加 电枢，然后减小到较低的范围，以连续运行电机，监控各个电机的功率输出，如果它低于指示切换到异步操作的阈值，则工作电压再次增加到中间范围 用于更新同步。

公开(公告)号：US4054943A

公开(公告)日：1977-10-18

申请号：US703118

申请日：1976-07-06

申请人： Johann Mundt

发明人： Johann Mundt

IPC分类号： H02H7/08 ,  H02P3/18

CPC分类号： H02P3/18 ,  H02H7/0805

摘要： A circuit arrangement for the automatic de-excitation of a hysteresis motor whose reactive power intake is compensated by capacitors and whose stator windings, which are fed from a three phase mains via a frequency converter, magnetize the rotor with their rotating field and thus produce a permanently magnetic excitation which continues in the rotor in the form of residual magnetic poles even after disconnection of the motor from the three phase mains. A voltage monitor monitors the mains side input to the frequency converter and responds upon interruption of the mains voltage due to malfunction or end of operation. Upon interruption of the mains voltage a capacitor of a buffer circuit in the d.c. intermediate circuit of the frequency converter transfers its stored energy, with decaying voltage, to the stator of the motor via an inverter which forms the output of the frequency converter, and upon response of the voltage monitor, the output frequency f.sub.0 of the inverter is automatically increased by a predetermined amount .DELTA.f, whereby the residual magnetism in the rotor is quenched.

摘要翻译： 用于自动消磁滞后电动机的电路装置，其无功功率摄取由电容器补偿，并且其定子绕组通过变频器从三相电源馈送，其转子利用其旋转磁场进行磁化，从而产生 即使在马达与三相电源断开连接之后，永磁激励仍以转子中的残余磁极的形式继续。 电压监视器监视变频器的电源侧输入，并由于故障或操作结束而中断电源电压时进行响应。 在电源电压中断时，直流电路中的缓冲电路的电容器。 变频器的中间电路通过形成变频器输出的逆变器将具有衰减电压的存储能量传递给电动机的定子，并且在电压监视器响应时，逆变器的输出频率f0自动 增加预定量的DELTA f，从而使转子中的剩余磁性骤冷。