SYSTEM FOR SUPPLYING POWER TO AND CONTROLLING A POLYPHASE BRUSHLESS MACHINE

摘要

What is proposed is: a system for supplying power to and controlling a polyphase brushless machine, said system consisting of: a plurality of bidirectional controlled rectifiers, the inputs of which are coupled to an AC system; units for controlling the bidirectional rectifiers; current sensors; and a control-action control channel with a corresponding feedback sensor. In order to ensure that the form and the displacement angle between the phase currents and voltages remain constant during operation at different rotation speeds, and to ensure a different output power, and to ensure an increase in the operational reliability, each phase of the polyphase brushless machine is coupled to a dedicated bidirectional rectifier and has a current sensor. In the proposed system, the frequency of the common power supply system is several times greater than the frequency of the emf of the polyphase brushless machine, and the control unit is designed in such a way as to ensure a set current form and a set displacement angle in each phase and also to set the magnitude of the current whilst maintaining the same currents between all of the rectifiers and ensuring a minimum value for the error signal on the control-action channel.