How to Control the Speed of a Motor?

It will depend on what type of motor you have. For a DC motor you use a variable resistor. Just have a look on toys that you will understand (eelectrictrains or those cars that run on a track).

1. motor oil for a sewing machine?

look for the picture on the can of 3 in one oil that shows a sewing machine. that's the kind of 3 in 1 that you want

2. Best way to control this AC motor

The motor is probably a single-phase induction motor. Induction motors can not be controlled very well by controlling the voltage. Induction motors try to run at their synchronous speed regardless of voltage. Reducing the voltage reduces the amount of torque that the motor can produce, makes it weaker. That tends to make the motor slow down. If the motor is driving a fan or centrifugal pump, considerably less torque is required to run at slower speeds, so the motor can slow down a little and continue to run ok. If the load requires the same torque at any speed, the motor is likely to slow down only a little and then stall and draw high current. Even a fan or pump might not operate at less than 1/2 to 3/4 speed.You can buy a variable frequency drive (VFD) for a single-phase induction motor, but few manufacturer's make them and they tend to be rather expensive. They are better than voltage reduction devices, but they are not recommended for any type of load except fans and pumps. They also can not be used with capacitor-start motors, only shaded pole or capacitor-run motors

3. Starting a DC motor

Probably your transistor is not being driven hard enough to supply the start-up current for the motor. Try lowering the base resistor (no lower than about 220 ohms though). Also, make sure you have a catch diode across the motor.

4. if motor speed is constant motor pulley is 6" in dia and fan pulley is 18"?

I may not understand the question properly..................I was going to say that you should go for a larger motor pulley

5. Can an aluminum boat handle a bigger motor then it is rated for?

Yes you could use a bigger engine... .But you would have to put some extra weight in the bow to counteract lift. Its all a matter of balance. First make sure though, your transom is strong enough to take a larger engine....It should be.

6. How to build a perpetual motion motor ?

you cannot, it violates the law of conservation of energy

7. Is there a list of best electric motor manufacturer? Is Marathon electric a reliable motor manufacturer?

You might want to check out the online Thomas Register. That's the best I can offer

8. 03 impala motor mount problem?

get rid of that car its just a start of a list of problems your going to be facing #1 over heating 2 plugs cat converter i can go on for ever

9. Rebuild my 01 Eclipse motor or swap?

A 90-99 eclipse comes with a 4g63 engine which is the same as an EVO I-IX,if you get a GS-T it will be turbocharged and if you get a GSX it will be turbo and AWD,also look into Eagle Talons and Plymouth Lasers of around the same years,there pretty much the same car and you wont need to swap the engines just upgrade.those motor have a ton of potential

10. why in-wheel BLDC motor have more pole than normal BLDC motor?

In-wheel motors have lots of poles so that they can operate effectively at low rotational speeds.Think about pretty much any bare "electric motor" you see. They usually go whizzing around at normal operating speeds. This is why gear heads on electric motors are common. They give you high torque at the slower speed you actually want, while allowing the motor design speed to be a much more convenient higher speed.For direct-drive in-wheel operation, there is no option for a gear box. The motor has to run at the wheel speed. Even at highway speeds for typical cars, that's still quite slow for electric motors.Lots of poles allows the magnetic cycle speed to be fast - that's actually what matters - while the shaft speed is lower. With 46 poles, for example, the electrical and magnetic speed is 46 times higher than the mechanical shaft rotation speed.This is not usually done because lots of poles increases manufacturing complexity and cost. In most applications, gear boxes are a better tradeoff. Put another way, lots of poles is plan B when plan A (gearbox) can not be used

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Tips to Help You Design the Perfect Solar Battery for That Party
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There are two main types of solar battery that are available in the market and there are two types of solar battery. They are Solar Rechargeable Battery and Solar Lithium Battery. These batteries can be bought from various stores and you can find different kinds of solar battery at different prices. They are good for low energy consumption and it is very easy to charge them.
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