Thyristor drive

A thyristor drive is a motor drive circuit where AC supply current is regulated by a thyristor phase control to provide variable voltage to a DC motor.

Applications

Thyristor drives are very simple and were first introduced in the 1960s. They remained the predominant type of industrial motor controller until the end of the 1980s when the availability of low cost electronics led to their replacement by chopper drives for high performance systems and inverters for high reliability with AC motors. They are still employed in very high power applications, such as locomotives, where the high power capability of the thyristors and the simplicity of the design can make them a more attractive proposition than transistor based controllers.[1][2]

A derivative of the thyristor drive is the simple AC phase controller. This uses a single phase controlled triac to provide a variable voltage AC output for regulating a universal motor. This is the type of motor speed control most commonly used in domestic appliances, such as food mixers, and small AC powered tools, such as electric drills.[1]

gollark: They must have so many weird special cases everywhere for slightly broken software or hardware.
gollark: I've read a bit about it, and it's probably 80% insanity given the amount of stuff they do to maintain backward compatibility.
gollark: Yes, they could probably just put basically anything in there and it would be hard to do anything about it.
gollark: No, I mean it would be hard to do in the various open source OSes.
gollark: > Maybe you've never thought about this, but if there are 100 devs working for free you'd only need to hire 50 devs to compromise all their code.That's, um, still quite a lot given the large amounts of developers involved, and code review exists, and this kind of conspiracy could *never* stay secret for very long, and if you have an obvious backdoor obvious people are fairly likely to look at it and notice.

References
  1. "INDUSTRIAL ELECTRONICS NOTES (PART 2) | Rectifier | Semiconductor Devices". Scribd. Retrieved 2018-09-30.
  2. "design and construction of a thyristor speed control of a dc motor- for B.Sc, HND, and OND project topics and material | www.hyclassproject.com". www.hyclassproject.com. Retrieved 2018-09-30.
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