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- Q: I am working on building an automatic cat food feeder out of an alarm clock. When the alarm goes off it triggers a geared motor with a pulley system to pull the lid off a container until a kill switch is struck. I would like to know how to wire the motor to go in the reverse direction after the power is cut, any ideas?Thanks in Advance!
- I believe it is an AC motor not DC. You have both a running winding and a starting winding. If you remove the capacitor from the start winding and put it on the running winding the motor might be able to run backwards.
- Q: When you spin a DC Motor what kind of electricity is generater AC or DC?
- You would get DC because the motor has a commutator to to pick off the voltage of a sequence of windings as they pass the position of the brushes.
- Q: I took apart a couple of small motors and found that they all have the copper coils attach to the shaft and spin around stationary magnets, rather then the other way around.The reason I'm asking is because they also have those two copper prongs touching the shaft in order to transfer the electricity back and forth, which wouldn't be necessary if you had the magnets spin and the coils stationary.
- Motors work by having the rotor poles constantly attracted toward the stator poles they are approaching, and repelled from the stator poles they are moving away from. This means either the rotor poles or the stator poles must have alternating magnetic polarity. In a motor designed to run on AC, you could have magnets in the rotor if the stator coils are driven by AC. However this would require that the rotor spin exactly at the AC rate. Instead, AC motors don't use permanent magnets at all, but use the magnetic induction effect, with no commutator necessary, to produce rotating polarity in the rotor that matches that of the alternations of the stator field. For DC, coils are needed in the stator so the rotation of the rotor can be used to switch its own polarity via the coil current reversal provided by the commutator. If you had PMs in the rotor of a DC motor, with only DC in the stator coil there'd be no rotation. I suppose you could design a DC motor with a PM rotor and a commutator that switches the stator polarity. I think you'd need slip rings plus a commutator. That should work and it could be an interesting project.
- Q: How do you calculate Motor Current from the Torque Feedback?
- For DC motors and synchronous AC motors there is a linear relationship between torque and current. T=kt*I. Now, I don't know why you would want to use torque feedback, since current measurement is easier, cheaper, probably has more accuracy and a wider bandwidth.
- Q: My AC was doing great these past couple of days, the unit appears to be older. maybe 10-15 years? Anyway, last night and today, if you turn in on, you hear a light whirring, but the fan is not moving, and there is no cold air coming into the house. The HVAC itself is working fine by the way. Any thoughts or suggestions.
- Contact the local HVAC service center and have them do a service on the unit. If it is just a fan motor problem the diagnosis should take less than an hour then the RR will depend on the parts needed. Without the training to do the work you are just using AWAG about the system and it's problems.
- Q: Hey I understand the basic concepts of a dc motor/ alternator and want to know how many turns and such can anyone help I am going to try to make it charge some batteries by wind
- An alternator is not a DC motor - it is wound to produce alternating current (thus the name) which is rectified by diodes on the case to make DC. Winding a DC motor/generator is not a simple task requiring multiple segments and a commutator to collect the segments in detail. You would be much better off just buying one, perhaps used, than spending your time trying to build something with reliable bearings and speed.
- Q: Hi,I planning to buy a aquarium filter form ebay which works on 120vac 60hz . i stay in India where voltage is 220vac 50hz .this filter is having a permanent magnet rotor. please help me can this motor work if i use a voltage converter (220v to 120v ) .Is frequency mismatch does not matter please help
- It will still run on 50 hz power. It will just run at a slightly slower speed. Not slow enough to make much difference.
- Q: Why are electric hair dryers divided into direct current motors and alternating current motors? What are their differences?
- AC series motor electric blower is better, it is the working voltage of AC 220V, he and the electric heating wire in the circuit has no other connection, hair dryer can be cold and hot air. The DC motor is usually through a fine wire step-down rectifier drives a small motor, electric wire must work to motor work, it cannot provide separate cold, DC motor AC motor with low cost, high cost.
- Q: Specifically for a single phase AC induction motor...I'm having trouble wrapping my head around the concept of an overloaded motor drawing more current. Since current draw increases when electrical resistance decreases, then how does a motor with bad bearings increase current draw? I realize the motor needs to do a lot more work, but how does the extra mechanical resistance caused by bad bearings translate into a decrease in electrical resistance, which causes higher current draw? Is there a power equation factor here that I'm not taking into consideration?
- Hello Sanchez, When electrical energy is given to any motor, the mechanical output is always less than desired. This is because there are always some windage and frictional losses. You will understand from the following description: Motor input in stator can be divided into Stator Copper Iron losses and Rotor input. The rotor input can be further divided into Rotor Copper loss and Mechanical Power developed or Gross Rotor output. This Gross rotor output can be divided into Windage and friction loss and Rotor output or motor output. So in your case, even though the motor electrical resistance is not varying, but due to bad bearings, the windage and friction loss increases tremendously, leading to heating of motor. Since induction motor rotates at high speed, these losses will be very high, will lead to burning of motor, if the bearings are not replaced quickly.
- Q: how can increase the speed of an ac motor?
- You can't really increase the speed of an AC motor other than putting gears or a hydrostatic transmission on the output shaft. DC motors you can increase speed by upping voltage, but with AC the speed of the motor is determined by the frequency of the AC power supply and also the number of poles in the motor. Two poles is generally around 3450 rpm and four poles is 1750 or so. This is because the electromagnets that make the motor a motor can only operate as quickly as the poles are turned on and off in synchronous speed. Your only options are to increase the frequency of the AC with your own generator set and then you have to match the poles to the frequency. In other words the reason a 60Hz motor goes 3450 rpm is because the electricity cycles back and forth 3600 times each minute (60 cycles x 60 sec) so the highest theoretical rpm for the motor is 3600 rpm. It usually goes about 3500 rpm without a load due to friction forces and hysteresis eddy currents and so forth that use up some of the energy. So if you would up to a 100Hz incoming power supply you could put in two poles but not three since 3 doesn't divide into 100 equally. But say you did run two poles at 100Hz the theoretical speed of the motor would be 100 cycles * 60 sec = 6,000 rpm
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