Mine flameproof and intrinsic safety type variable frequency speed control device
An intrinsically safe, frequency conversion and speed regulation technology, which is applied in the direction of emergency protection circuit devices, electrical components, control systems, etc., can solve the problems that the frequency converter cannot meet the flammability and explosion problems, heat dissipation problems, etc. The effect of long life and high reliability
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[0015] The specific implementation will be described in detail below in conjunction with the accompanying drawings:
[0016] figure 1 It is a schematic diagram of the electrical principle of the embodiment of the present invention. figure 2 It is a schematic diagram of the secondary control loop of this embodiment. A flameproof and intrinsically safe frequency conversion speed regulating device for mining, which includes: a frequency converter BPQ composed of a three-phase rectifier, a filter capacitor, and an IGBT inverter, a control device, and a flameproof box. The control device includes: isolating switch DH, frequency conversion and control loop, power frequency and secondary control loop, wherein:
[0017] The power frequency and secondary control loop is composed of a power frequency loop and a secondary control loop. The power frequency loop is sequentially connected in three-phase by a transformer BK, a resistance-capacitance absorber ZR, an electric auxiliary heat...
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