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An arrangement for controlling the rotational speed of a by means of an indirect converter are designed with voltages of the amplitude and frequency motor which is fed
An arrangement for controlling the rotational speed of a by means of an indirect converter are designed with voltages of the amplitude and frequency motor which is fed
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机译:借助于间接变频器控制用于控制电动机转速的装置被设计成具有被馈入的振幅和频率电动机的电压。
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摘要
The method is for regulating the output voltage and frequency of an intermediate circuit. A static frequency changer is for feeding a three-phase motor driven at variable frequency and speed. This maintains the air-gap flux of the three-phase motor constant, independent of the load and motor speed, and with the least possible expense on electronics and with high accuracy. The EMF (UR) is used rather than the terminal voltage (U2) of the motor. The true value of the EMF (Uh) can be automatically derived from the motor terminal voltage (U2) by means of an arithmetic unit, and to convert the terminal voltage to the EMF an approximation formula can be used to simplify the electronic balancing network required. More specif. the approximation formula is used in a form that allows minimum expense on electronic hardware to be realised.
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