Re: 50 hz timer motor

James Sweet wrote:


They are called modules here, and generally control just the main motor speed, If the machine uses a brush type motor, it`s a simple triac chopper circuit, getting feedback from a tacho generator on the rear of the motor. Some induction motors are also controlled this way.
Machines with a solid state timer - so called computer washers - often have the triacs on the board to control the water valves and pump, and relays for the motor direction and heater circuit and a triac to operate the heat pause coil on the timer (I`m thinking Hotpoint here).



Heater circuit? Do they not just take in hot water from the central tank? Seems odd to use expensive resistance heat to warm water when most houses have cheaper (though not nearly as much so as it used to be) gas hot water, or is natural gas expensive enough there to justify electric?

They used to be hot and cold, but the domestic water isn`t hot enough for washing without a boost from the machines element
Surprisingly most machines here are cold fill only these days. they take in so little water on the wash program, the manufacturers claim it`s more economical to heat it in the machine. Thats also the reason why modern machines take so long compared to how they use to be.

Gas is a lot less expensive than electrikery when it comes to water heating.

Ron(UK)

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