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3phase AC Induction Motor derating or Upgrading the Insl class, according to ambient temperature rise?
- In theory the heat dissipation is linear, so an increase in ambient of 10C (aka 10K) will cause the winding temperature to increase by the same amount. Yes, you can use a higher insulation class throughout to allow the motor to run hotter. If you are not the motor manufacturer, ask the manufacturer what they would recommend.s
I need a DC/AC motor to vibrate a plate. The plate should vibrate within a range of 20-50G. Is that possible?
- 10 x 10 x 2 centimeters? that is 200 cc and if it weighs 150 gm, then it has 3/4 the density of water - like a medium weight wood - maple is about that. Could it withstand 20-50G without breaking off the mounts? Does the whole plate have to move? F=MA = 0.150 * 35 * 9.8 = 51.450 N (mid point of 20 to 50) ors
Dodge AC blower motor stops working, what to look for?
- you may need to replace the actual switch that turns it on ,i have seen a lot of those go bad and that's how they,ll do if it had anything to do with the resistor again it wouldn't work at all or it would have burnt the new resistor out on it,so you know that part of it is still working, id lean towards the switch ,it could have been part of the problem all along ,id try another switch on it,see if that doesn't repair it,you could also have motor going out on that one that will cause them to burn up resistors a lot,good luck.s
how to increase speed of electric motor?
- Basic DC motors work like this, The motor rotation generates a back EMF so the current is the voltage difference divided by the motor resistance. The current varies as the torque. So the stalled torque (zero EMF) varies as the input voltage divided by the motor resistance. But given no load, the motor will spin up to the point where the EMF matches the input voltage and current falls towards zero. The back EMF is the product of the speed and the field strength, so if you reduce the magnetic field, the motor will have to turn faster to generate the same EMF. Normally this would require more current but if you reduced the load as well, it could run faster without increasing the current.s
How do ordinary AC motors brake?
- Usually using one-way braking, braking, braking (single-phase bridge and three-phase half wave rectifier capacitance), electromagnetic braking, braking, self excitation generator - short power-off brake and short brakings
wwhat is the difference between AC and DC current?
- AC current carries frequency while DC current doesn't carry. AC current can be transmitted over long distances while DC cannot be done so due to the absence of frequency term.s
how would you change the running direction of a Universal motor running on AC?
- Universal motors are usually series connected, meaning the armature and field are in series. You have to reverse the connections ro one of them, the armature or the field. The wiring will look like supply active, field in, field out, brush in (to armature), brush out, supply return. The capacitor is a electrical noise suppressor, just connected across the supply, or sometimes across the brushes. If it is shunt wound as you seem to describe (meaning the field is across the supply and so is the armature) then the solution is still the same, reverse one of them.s
Speed control method of AC motor
- The characteristics of various speed regulating devices:(1) change pole speed regulation;Advantage：No additional slip loss, high efficiency;Control circuit is simple, easy maintenance, low price;The smooth speed regulation with higher efficiency can be obtained by matching with the stator voltage regulating or electromagnetic slip clutch.Shortcoming:Stepless speed regulation without stepless speed regulation. Due to the limitation of the motor structure and manufacturing process, only 2~3 kinds of pole to rail speed regulation are usually achieved, and the speed range is quite limited.s
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