The microwave oven uses a magnetron to generate microwave energy. The microwave energy travels through a waveguide and is distributed into a metal cavity where the food is cooked. The waves are absorbed by the food and excite water molecules in the food. This heat then transfers throughout the food cooking it.
How does a magnetron work in a microwave oven?
The cavity magnetron is the main component of a microwave. The magnetron is an oscillator where electrons are emitted from a hot cathode and whirl past resonant cavities which are part of the anode at speeds that generate microwave energy.
What can a magnetron be used for?
The magnetron is a high-powered vacuum tube that works as a self-excited microwave oscillator. Crossed electron and magnetic fields are used in the magnetron to produce the high-power output required in radar equipment.
What is the magneto tube filament voltage used in microwave oven?
For a microwave oven to operate, approximately Ϫ 4 kV should be applied to the magnetron cathode. The voltage is conventionally obtained by a high-voltage transformer and it is rectified by a half-wave rectification circuit. Due to this operation scheme, the microwave power is generated in an ac mode, i.e., at 60 Hz.
Why does a magnetron fail?
Proper cooling minimizes the potential failures due to decreased vacuum in the magnetron. Rejection due to insufficient electron emission from the cathode will show a sharp drop in the output power and moding during operation. Poor emission is due to residual gas in the tube, improper cathode temperature, etc.
Can a magnetron kill you?
Magnetrons can be incredibly dangerous, while you are safe from radiation when they are not powered, the ceramic insulators can contain beryllium oxide which can be fatal when inhaled.
Are magnetrons radioactive?
All magnetrons contain a small amount of thorium mixed with tungsten in their filament. While this is a radioactive metal, the risk of cancer is low as it never gets airborne in normal usage. Only if the filament is taken out of the magnetron, finely crushed, and inhaled can it pose a health hazard.
How much does a magnetron cost?
New magnetrons cost $50 to $100. If you’re shopping for one, be sure you’ve got the right type. Like most microwave replacement parts, it’s specific to the brand and model.
Is beryllium still used in microwaves?
BERYLLIUM OXIDE (BeO) IS USED TO MAKE CERAMICS FOR ELECTRONICS, ELECTRICAL, AND OTHER EQUIPMENT. BeO contributes hardness, strength, excellent heat conductivity, and good electrical insulation. … Because BeO is transparent to microwaves, it has also been used in microwave ovens.
What type of magnets are used in microwaves?
Each microwave has two magnets used in the magnatron. This is a open framed device with some aluminium cooling fins attached to the cooking cavity behind the control panel. Even the small microwaves have two 2″ diameter X 3/8 ceramic magnets in them.
Can a microwave transformer kill you?
Microwave oven transformers are indeed LETHAL the current and voltage that they put out is more then enough to kill you, the voltage and current they run off will quite happily kill YOU! … And as fun and as simple as these deadly but wonderfully robust transformers are, it is possible to get more technical into them.
Which microwave tube has a series of cavities?
Explanation: Extended interaction oscillator is a linear beam oscillator that uses an interaction region consisting of several cavities coupled together, with positive feedback to support oscillation. 10. Magnetrons are microwave devices that offer very high efficiencies of about 80%.
Is it worth replacing magnetron in microwave?
The typical magnetron tube has an average life of 2,000 hours of operation. That means you should be able to cook and heat food in a typical microwave oven for 2,000 hours before then oven loses power. … If your microwave is relatively new and the repair costs less than replacing it, the fix is worth it.
How long should a magnetron last?
The typical microwave magnetron tube has an average life of 2,000 hours of operation. That means you should be able to cook and heat food in a typical microwave oven for 2,000 hours before the oven loses power.
What does a bad magnetron sound like?
If your microwave is loud, noisy or making unusual clicking sounds, it could be a result of a defective magnetron tube. … If it’s burnt out or damaged, it can emit a high-pitched, growling or clicking sound.