Induction machine slip control

In summary, the conversation discusses controlling a generator or motor to stay at a near 90-degree angle for maximum torque. One suggestion is to use a VFD as a component in vector control, rather than varying the rotor resistance with feedback. It is also mentioned that it is generally preferred to avoid interfacing with the rotor and focus on the stator. However, the person is disappointed that they may need to use variable frequency drives for this purpose.
  • #1
tim9000
867
17
Hi,
Say you wanted to have a generator or motor stay at near 90degrees for maximum torque while generating or motoring, over various loads or over various supply frequencies.
I assume there is some established method of controlling this (varying the rotor resistance with feedback perhaps?) does anyone know what it is, or have any literature on it?

Cheers!
 
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  • #2
tim9000 said:
I assume there is some established method of controlling this ...
You use a VFD as a component in vector control.

tim9000 said:
varying the rotor resistance with feedback perhaps?
No, you generally try to avoid having to interface anything with the rotor. The stator is where it's at.
 
  • #3
milesyoung said:
You use a VFD as a component in vector control.No, you generally try to avoid having to interface anything with the rotor. The stator is where it's at.
Damn, I was hoping it wouldn't come to variable frequency drives.
Ok, thanks anyway.
 

1. What is slip control in an induction machine?

Slip control in an induction machine refers to the control of the rotor speed relative to the stator speed. This is achieved by varying the frequency and voltage of the electrical supply to the machine.

2. Why is slip control important in induction machines?

Slip control is important in induction machines because it allows for better control of the machine's speed, torque, and efficiency. It also helps to prevent overheating and damage to the motor.

3. How is slip control achieved in an induction machine?

Slip control in an induction machine is achieved through the use of a variable frequency drive (VFD). The VFD adjusts the frequency and voltage of the electrical supply to the machine, which in turn controls the speed of the rotor.

4. What are the benefits of using slip control in induction machines?

There are several benefits of using slip control in induction machines. It allows for precise speed control, improved energy efficiency, and reduced wear and tear on the machine. It also enables the machine to operate at different speeds, making it more versatile for various applications.

5. Are there any limitations to slip control in induction machines?

While slip control is beneficial, it does have some limitations. It can lead to higher harmonic distortion in the electrical supply, which can cause interference with other equipment. It also requires careful calibration and maintenance to ensure proper functioning.

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