The speed of an electric motor can be controlled by

DC motor speed control can be achieved by varying flux, armature voltage. Universal motors are known to sometimes overspeed when run with no load. An adjustable speed drive can often provide smoother operation compared to an alternative fixed speed mode of operation. Use an inverter to power the AC motor.

Select an inverter that can supply the motor voltage and current including the starting current.

Use the range of speed variation required to select the range of frequency that the inverter must be able to supply.

The inverter controls will vary the frequency supplied to the .

This method gives speed above normal and the method is used in electric drives in which speed should rise sharply as soon as load is decreased. As induction motors are widely being use their speed control may be required in many applications. The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor. I will correct Matthew Lai: steppers, induction motors and synchronous motors all have variable speed controllers these days.

Some motors require different speed control techniques - brushless DC, and many others. For fruther knowledge about how the speed of induction motor is controlled you can refer here:. However, DC motors cannot be used for regenerative braking, so these vehicles cannot travel as far on the same battery, all other factors being equal.

For example, a numerically controlled lathe will accurately position the cutting tool according to a . A DC motor is usually supplied through slip ring commutator as described above. Using microcontroller-based control systems, one can add speed variation to the system. In addition to the option of speed variation, the direction of rotation can also be change depending upon the motor control algorithms used. Permanent Split Capacitor (PSC) motors are the most popular type of . So what can we do to control the speed of an AC induction motor ? Change the frequency of the AC signal. The most common types rely on the forces produced by magnetic fields.

Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change . This means that these motors can only have direct variable speed control if their stator excitation frequency varies. This usually means some form of electronic motor drive. A Groschopp motor speed controller is designed for precision and efficiency. Visit our Controls Help Page for additional resources related to our motor drives.

Electric Drives - Motor Controllers and Control Systems. Designs were often lossy or they provided only crude increments in the . Small DC motors ideal for use in applications were speed control is required such as in small toys, models, robots .