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Author Topic: series wound dc motor can run very fast  (Read 2103 times)

Offline gezgin

  • Jr. Member
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  • Posts: 65
series wound dc motor can run very fast
« on: March 15, 2008, 10:46:08 AM »
I have idea, series wound dc motor can rotate very fast without load if we can control current, we can produce some overunity?...
n=.K/I  ,when trigger current goes to zero, speed-->very fast. mian problem is brushes..
if we add small alternator or magnets, and control circuit for current&speed , it can be test..

This type of motor develops a very large amount of turning force, called torque, from a standstill. Because of this characteristic, the series dc motor can be used to operate small electric appliances, portable electric tools, cranes, winches, hoists, and the like. Another characteristic is that the speed varies widely between no-load and full-load. Series motors cannot be used where a relatively constant speed is required under conditions of varying load. A major disadvantage of the series motor is related to the speed characteristic mentioned in the last paragraph. The speed of a series motor with no load connected to it increases to the point where the motor may become damaged. Usually, either the bearings are damaged or the windings fly out of the slots in the armature. There is a danger to both equipment and personnel. Some load must ALWAYS be connected to a series motor before you turn it on. This precaution is primarily for large motors. Small motors, such as those used in electric hand drills, have enough internal friction to load themselves. A final advantage of series motors is that they can be operated by using either an ac or dc power source. This will be covered in the chapter on ac motors

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