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What is the operating principle of thyromat control system for cranes?
Wiki User
∙ 11y ago
The THYROMAT is connected in series with the stator supply voltage.
The control unit varies the stator voltage of the slip-ring motor by adjusting the firing angle of the inversely connected (parallel) thyristors in each of the three phases. The motor torque is proportional to the square of the stator voltage (T a V2 - where T is the motor torque and V is the stator voltage). The speed of the motor is measured by the frequency of the rotor. Reversing the direction of motor rotation is achieved by switching externally mounted reversing contactors at zero current.
Wiki User
∙ 11y ago
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