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I have an AC motor. I wants to reduce its rpm by putting resistance in series. Would it affect its life?
- Theoretically most things are assumed Ideal. But experimentally any loads applied will reduce lifespan. It basically forces electrons to flow through the resistors and reduces the overall potential by converting some of its energy into heat and other forms of energy. Over time this reduces the efficiency of the system that was once considered to be in steady state.s
Is there normally a way to grease the bearings in the main motor on an AC?
- Some motors have sealed ball bearings - no lubrication required. Others use common light duty oil. If yours is sealed, you won't have anyway of injecting oil or grease. If you have sleeve bearings, there will be an opening on the end of each motor bell housing where you can inject oil. It may be covered with a plastic cap (mine was a plastic yellow cap/plug about 3/16 dia). The WD-40 is a temporary fix. It will squeak again.s
AC electric motor Question?
- that is 100 times smaller motor than what you have in mind. 1HP=746W=0.746kW 0.55kW is about 3/4 HPs
Which motor has a great torque when the motor is under DC at the same power?
- To sum up, the DC motor is still larger than the torque of the AC motor.s
Central AC unit fan was humming and not spinning. Capacitor or fan motor or both?
- If the humming has stopped then the motor has died. Either that or a fuse or relay on the control board has overloaded and blown. Best to get a tech in to check it out BEFORE more heat comes your way. Today we're expecting 99 degrees, but come Wednesday 104. Yikes. Sorry. (s
Please! What is the correlation between slip (speed and frequency) and an electric motor?
- The synchronous speed of an ac motor is determined by the number of poles a motor is wound for and the frequency of the current. RPM = Frequency x 60 x number of poles. AC motors must run a little less than synchronous speed. The difference in synchronous speed and actual no load speed is called slip.Some ac motors are made for speed control by externally changing the number of poles. Get the right hp motor and type for the application.s
does a 3 phase ac electric motor used as a generator create 3 phase ac power?
- Yes, it generates 3-phase power. To create the magnetic field that transfers energy from the rotating shaft to the stator coils, it needs either: 1. Permanent magnets (no excitation required, synchronous generator) 2. A dc exciter (think of it as using electromagnets in place of the permanent magnets) 3. 3-phase power applied to the output. When the prime mover spins the shaft faster than synchronous speed, the device acts as a generator. When the prime mover tries to slow below synchronous speed, the device acts as a motor. This is an induction generator. It can't work as a stand-alone generator. It has to connect to the grid or to a power source (such as another synchronous generator) that can provide reactive support. You can also use a 3-phase motor to convert 1-phase to 3-phase. You apply single phase to two of the output terminals. The trick is that you have to manually start the motor spinning, or use a timer to temporarily connect a capacitor. It will then come up to speed on its own. It will generate the missing phase. You can connect a three-phase load to the three terminals (with proper protection, of course). Look up static phase converter for more information.s
anybody know how to generate 353kw of electric power for a motor that will run a car?
- humm sound like you and i have sort of the same idea except i was thinking about a regular car. i thought the weak link was the electric motors, sound like you have that handled, now for the power plant must be small and light i was thinking of a small jet engine like the ones used for RC models with a direct drive to hydraulics that turn a generator sort of link a turbo prop with a reduction gear box. not sure why GE is not using this for there large diesel locomotives, i know that jet engines are used on ships and for a power plant some times such as a APU used on 747 and C-5 aircraft. if this works please e mail me i want to see this happen.s
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