Q:difference between ac open loop , vector control, servo modes

With open loop you just send a voltage at a set frequency from your inverter to the motor. You only measure the current to see if the motor is having trouble or not. You could have the motor turning erratically or not at all if there is a problem in the connection. The inverter will have the same output regardless. With Vector control you normally need a normal motor with some kind of feedback like an encoder on the shaft. This way you can determine the speed that the motor actually runs at and correct accordingly if it doesn't respond like you want it to. If the motor doesn't turn correctly for any reason it will trip on the inverter. You can also run on vector control with an encoder mounted on a pulley or belt or product that the motor is controlling. Servo mode is a pretty precise control and you can control the motor to a specific position and hold it at a position without turning. You can get a normal AC motor to react in this matter but the accuracy is not as good as an actual servo motor. 5% against 1%. You need to have an encoder on the shaft of the motor for this. In general you run on open loop unless you want to control the inverter in special application.

Q:I just opened a magic bullet mixer and took out an electric motor. I don't know what to do with it. I want to make something cool with it. Please give me ideas.

Well, if I were you, I wouldn't mess too much with it. What are electric motors generally used for? Hmm, maybe electric vehicles? Lightbulb! Drive an electric car, and decrease the amount of pollution. Great idea!

Q:HELLO, I WANT TO CONVERT ABOVE CONFIGURE MOTOR 1440 RPM TO 120 RPM ONLY BY ELECTRICAL OR ELECTRONICS SOLUTION. PLEASE ANY ONE PROVIDE ME SOLUTION AND CIRCUIT DIAGRAM FOR THAT. I DONT WANT VARIABLE SPEED CONTROLLER. I JUST MAKE ONLY ONE CONTROL OF SPEED AT TIME. SO PLEASE GIVE ME LOGIC AND CIRCUIT LOGIC ALSO.

There is no way to do that. This is an induction motor. A VFD (Variable Frequency Drive) will not work as pointed out by lunchtime_browser. You will have to use a gearbox with almost any motor to do that. If you use an induction motor (squirrel cage or AC motor), it is possible to control a 3 phase motor to lower speeds by using a VFD, that reduces the voltage and changes the frequency, but only within limits. These can be programmed to a fixed speed, but not so slow as 120 RPM. The cooling might also need to be addressed (fan too slow). Single phase (split phase) motors are more limited, whether using a centrifugal switch or not. You probably need a DC motor if you insist on no gearbox. The variable speed controller to suit this motor is just set to the speed you want. If you need a precise speed it needs a speed controller with speed sensor and feedback. Note that the mechanical power is the product of RPM and torque. The torque is more or less the same, as it is determined by the current rating. However with 120 RPM from a 1440 RPM motor the speed is only 1/12 so the power is only 1/12. Using a gearbox increases the torque and reduces the speed so the power is more or less the same. There are gearmotors for a wide range of output RPM. A bicycle hub motor might suit if the power is in your range. Another idea is a stepper motor, which can run at these low speeds, but it does need a controller (driver) and power supply..

Q:My friend said she got a strong electrical burning smell and her blower doesn't work in any of the positions. I'm assuming its the blower motor. Anything I should be aware of?

the resistor can go bad in those.check the compressor too, but it is probably the motor with a burning smell. take it apart and check it i have seen mice build nests in them, you will probably have to replace resistor as well, the blower motor usually will short out the resistor

Q:AC or DC motors for rolling gate motors?

The volume gate motor is related to the size of the AC or DC motor and the gate body.Relatively large door, the door material used is relatively heavy, generally use AC motor, torque is relatively enough.

Q:is it necessary to use both ac and dc motor in car??

I thought DC only! Car batteries are low voltage device and short distance from the generator so no point to generate AC voltage and convert back to DC for charging the battery.

Q:It is an older motor, but runs well... except that it doesn't always start in the same direction. When I switch it on, it hangs for a second and then starts in either one direction or the other.

Either the starting capacitor is worn out, or disconnected, or the centrifugal switch is not working, or the startup winding is open or disconnected. See the image in the source below.

Q:will an ac motor (air pump motor) generate electricity if turned manualy?

VFD manufacturer's may also hav some information about regeneration, regenerative braking and dynamic braking. Both regenerative and dynamic braking involve a motor acting as a generator.

Q:What are the characteristics of ac synchronous motor and list a few of its applications?

* Constant speed usage for a class B NEMA design (standard industrial duty) @ ~100-200 motor staring torque.

Q:Hi, I was wondering how to connect my FASCO model K628 motor to a AC power plug. It says: brn- commonblk-208v Red, Orn,Orn 230v Its my first time doing this, and I'm really confused Thanks!

This is a single-phase motor for use on either 208 volts or 230 volts. You need either a 208 volt or a 230 volt source. For 208 volts, connect one hot wire to the brown motor lead and the other to the black motor lead. Tape the Red, Orn, Orn lead so that the bare end can's touch anything. For 230 volts, connect one hot wire to the brown motor lead and the other to the Red, Orn, Orn motor lead. Tape the black lead so that the bare end can's touch anything.