FREQUENCY-CONTROLLED ASYNCHRONOUS ELECTRIC DRIVE Russian patent published in 2009 - IPC H02P27/04 H02P25/22 B60L9/12 

FIELD: electricity.

SUBSTANCE: present invention relates to electrical engineering and can be used in rail vehicles and directly relates to asynchronous traction drives of railway engines. The frequency-controlled asynchronous electric drive for rail vehicles contains an electric motor at least two arc stator windings, mechanically linked to the wheel pair, fitted on the rails, a speed sensor for the electric motor and a control system. The control system consists of a static frequency converter with self-excited inverters for powering the stator windings and a unit for controlling the converter with feedback on speed and direct contact with the static frequency converter. The control system generates signals for controlling the inverters using an algorithm with single commutation of bearing elements in one period. It also provides for changing frequency of voltage at the outputs of the self-excited inverters and shifting current of the inverters relative each other by an angle, defined by the number of arc windings. The electric drive is provided with a device for measuring rotational acceleration of the electric motor, connected to the speed sensor of the electric motor and detecting onset and end of the process of slippage of the wheel pairs, and a device for regulating angle of displacement of current of arc stator windings. When the wheel pair is slipping, the regulator provides for reduction of the angle of displacement of supply current of arc windings in the range π/3k>Θ≥0, defined by the number of arc stator windings, from signals coming from the device for measuring acceleration. The required pulsation of rail tractive force of the drive is set, which allows for attaining maximum tractive force with useful sliding motion in the zone of maximum possible traction coefficient.

EFFECT: improved towing performance of the electric drive in conditions of limited interlocking of wheel pairs and rails.

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