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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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multiple magnetrons in bigger microwave oven
I am interested to know if more than one magnetron can be used with a
bigger cavity to enhance cooking more quantity of stuff..... relation of cavity with magnetron's frequency/ power output etc. -Harry |
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#3
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I once worked on a commercial Panasonic microwave oven, it ran on 220 vac
and had two complete maggies and two separate HV supplies. One maggie fed into the bottom of the cavity and the other one fed the top as in a conventional home oven. Both feeds had stirrers. Unfortunately, one of the maggies was bad, and the cost of repair vs the age, cost of new oven, etc etc was not favorable. We scrapped the oven, but I bet that momma would cook like nobody's business! According to the nameplate, it had a 3600 watt input/ 2100 watt output. It was used in a fast food joint to heat food just before sale. I always wondered how they kept those two maggies from cooking each other. Regards, Tom "Rich.Andrews" wrote in message . 1... (T.J. Harry) wrote in news:e6f7d414.0410021025.92c63a9 @posting.google.com: I am interested to know if more than one magnetron can be used with a bigger cavity to enhance cooking more quantity of stuff..... relation of cavity with magnetron's frequency/ power output etc. -Harry I think you would have to make a waveguide multiplexer. r -- Nothing beats the bandwidth of a station wagon filled with DLT tapes. |
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When using dual magnetrons, there has to be a consideration for their
phase correction. If there is any shared area of radiation, and if there is any phase shift between them that is leading to being out of phase, there will be some wasted energy. This would cause them to be cancelling each other, rather than be summing their energy outputs to the target, which is the food inside the microwave oven. The wasted energy would be causing the magnetrons and the power supply to run hotter, and thus become less efficient. As for home use, when considering that these systems are working at about 900 to 1200 Watts each, depending on the type and model, having 2 magnetrons would be a bit much. -- Jerry G. ====== "t.hoehler" wrote in message news:TuL7d.158766$MQ5.15304@attbi_s52... I once worked on a commercial Panasonic microwave oven, it ran on 220 vac and had two complete maggies and two separate HV supplies. One maggie fed into the bottom of the cavity and the other one fed the top as in a conventional home oven. Both feeds had stirrers. Unfortunately, one of the maggies was bad, and the cost of repair vs the age, cost of new oven, etc etc was not favorable. We scrapped the oven, but I bet that momma would cook like nobody's business! According to the nameplate, it had a 3600 watt input/ 2100 watt output. It was used in a fast food joint to heat food just before sale. I always wondered how they kept those two maggies from cooking each other. Regards, Tom "Rich.Andrews" wrote in message . 1... (T.J. Harry) wrote in news:e6f7d414.0410021025.92c63a9 @posting.google.com: I am interested to know if more than one magnetron can be used with a bigger cavity to enhance cooking more quantity of stuff..... relation of cavity with magnetron's frequency/ power output etc. -Harry I think you would have to make a waveguide multiplexer. r -- Nothing beats the bandwidth of a station wagon filled with DLT tapes. |
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"Jerry G." writes:
When using dual magnetrons, there has to be a consideration for their phase correction. If there is any shared area of radiation, and if there is any phase shift between them that is leading to being out of phase, there will be some wasted energy. This would cause them to be cancelling each other, rather than be summing their energy outputs to the target, which is the food inside the microwave oven. The wasted energy would be causing the magnetrons and the power supply to run hotter, and thus become less efficient. If they are not phase locked, then the power will add. On a short time scale, there may be interference effects but they should average out. I wonder if they deliberately make sure the frequencies aren't quite the same? If they phase lock to each other, then indeed care must be given to interference, hot spots, reflected power damage, etc. --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/ Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/ +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html Note: These links are hopefully temporary until we can sort out the excessive traffic on Repairfaq.org. Important: Anything sent to the email address in the message header is ignored. To contact me, please use the feedback form on the S.E.R FAQ Web sites. |
#6
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Jerry G. wrote:
When using dual magnetrons, there has to be a consideration for their phase correction. Magnetrons will always phaselock to any signal that is back fed into them, provided it is close to their own natural resonant frequency. So, the two magnetrons will reach a compromise and oscillate, in phase, at some frequency between their natural resonances. -Chuck Harris If there is any shared area of radiation, and if there is any phase shift between them that is leading to being out of phase, there will be some wasted energy. This would cause them to be cancelling each other, rather than be summing their energy outputs to the target, which is the food inside the microwave oven. The wasted energy would be causing the magnetrons and the power supply to run hotter, and thus become less efficient. As for home use, when considering that these systems are working at about 900 to 1200 Watts each, depending on the type and model, having 2 magnetrons would be a bit much. |
#7
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T.J. Harry wrote:
I am interested to know if more than one magnetron can be used with a bigger cavity to enhance cooking more quantity of stuff..... relation of cavity with magnetron's frequency/ power output etc. My microwave oven has two magnetrons. So apparently it is possible, never bothered to figure out how they did it though. -- Peter van Merkerk peter.van.merkerk(at)dse.nl |
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