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In control applications for motors the choice of the solid
state switch to be used is always very important for the designers: the cost, reliability, ruggedness, and ease to be driven must always be kept in mind. This is especially important in motor control circuits where the designer has to optimize the circuitry for controlling the motors in the correct and efficient way. In the large family of electronic switches, the thyristor must be considered as a low cost and powerful device for motor applications. Thyristors can take many forms, but they have certain features in common. All of them are solid state switches which act as open circuits capable of withstanding the rated voltage until triggered. When they are triggered, thyristors become low impedance current paths and remain in that condition (i.e. conduction) until the current either stops or drops below a minimum value called the holding level. Once a thyristor has been triggered, the trigger current can be removed without turning off the device. 
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