Posts Tagged ‘microwave oven’
Synchronous Motors in Microwave Ovens
Synchronous motors naturally operate at a constant speed, and are most often used when an exact and stable speed is required. In this article we explain what a synchronous motor is, with their use as a microwave oven component as an example, how to tell if it has failed, and what to do to fix it.
A synchronous motor is an AC (alternating current) motor identified by two basic components, a stator and a rotor. The stator is the stationary part of the unit, as found in generators and other motors. The rotor is the rotating part of the unit as found in motors, generators, pumps, and alternators. It is similar to an alternator with a rotating field.
Common uses for synchronous motors are clocks, tape players, and microwave oven components. In a microwave oven the synchronous motor drives the turntable. The use of this type of motor ensures a constant smooth rotation of the microwave turntable when the unit is in use.
Once the microwave oven start button has been pressed by the user, a switch is activated which fires up a number of vital components which when combined create the effects we expect from a domestic, commercial, or industrial microwave. In domestic units the energy supplied allows the microwave motor to turn the turntable at a slow and constant of about 3rpm. When the timer ends or the door is opened the power link is broken and the unit switches off immediately.
Identifying a Faulty Microwave Oven Component
In this article we give you a few pointers to help locate the fault in your microwave without getting technical.
Remember microwave ovens can be very dangerous. Even when unplugged they can store a lethal charge and have the capacity to explode if not handled correctly. Only individuals qualified in the relevant fields should attempt to dismantle, test and repair a microwave oven. If you are not qualified, do not attempt to fix your microwave oven yourself.
Food is not heating & buzzing noise present
The obvious thing to check yourself is that you have the microwave on the correct power setting and timer.
If you have checked the above and still are experiencing these symptoms you may have a faulty magnetron. These symptoms will also present themselves if your microwave oven diode is at fault, however the magnetron is usually the first port of call for a repairer in this situation. This is not a job you can carry out yourself.
The microwave oven is not working at all
Check first that the microwave is plugged in, turned on, and the wiring is all in tact without cuts, tears or breaks in it. Check the electrical plug’s fuse to make sure it has not blown.
Next check the open and closing mechanism of the microwave oven door. If the microwave is still inoperable at this point you must stop using the unit and call a qualified repairer.