A field speed control device of an explosion-proof variable frequency motor

Abstract

The utility model discloses a kind of field speed regulation control devices of anti-explosion area variable frequency motor, including main motor loop, secondary control loop, switch board, heat dissipation fan loop and frequency conversion operation box, the start-stop of variable frequency main motor is controlled by frequency converter in the main motor loop, the heat dissipation fan of heat dissipation fan loop is used to be the ventilation heat dissipation for the variable frequency main motor, the heat dissipation fan loop is connected in parallel on the main motor loop, the heat dissipation fan linkage start-stop the variable frequency main motor, the secondary control loop includes variable frequency speed regulation control loop and heat dissipation fan control loop, the fault output end of the frequency converter speed regulation control loop is electrically connected with the heat dissipation fan control loop, for the failure signal of the frequency converter is introduced to the heat dissipation fan control loop;The frequency conversion operation box is electrically connected with the secondary control loop, the distribution bus of the switch board respectively.The utility model equipment is simple, and input cost is reduced.

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