发明授权
US4447788A Method for optimizing the power input of a plurality of hysteresis
motors connected in parallel
失效
用于优化并联连接的多个滞后电动机的功率输入的方法
- 专利标题: Method for optimizing the power input of a plurality of hysteresis motors connected in parallel
- 专利标题(中): 用于优化并联连接的多个滞后电动机的功率输入的方法
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申请号: US438945申请日: 1982-11-03
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公开(公告)号: US4447788A公开(公告)日: 1984-05-08
- 发明人: Johann Mundt , Horst Kasper , Eckhard Pritsch
- 申请人: Johann Mundt , Horst Kasper , Eckhard Pritsch
- 申请人地址: DEX Julich
- 专利权人: Uranit Uran-Isotopentrennungs-Gesellschaft mbH
- 当前专利权人: Uranit Uran-Isotopentrennungs-Gesellschaft mbH
- 当前专利权人地址: DEX Julich
- 优先权: DEX3151904 19811230
- 主分类号: H02P5/74
- IPC分类号: H02P5/74 ; H02P23/00 ; H02P25/024 ; H02P5/46
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.
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