The various types of industrial motors that can be used with variable frequency drives are: … Ac synchronous motor with brushless ac or brushed excitation. Ac synchronous motor with permanent magnet excitation: This type of motor is specifically designed for operation with a variable frequency drive.
Can you make any electric motor be variable speed?
To have electronically variable speed you will either need a universal/dc motor with PWM speed controller or a 3-phase inverter-duty induction motor with a variable-frequency inverter to control its speed.
Which motor is used for variable speed?
For applications where variable speeds are necessary, typically an AC motor with an Inverter or brush motors are used. Brushless DC motors are an advanced option due to their wide speed range, low heat and maintenance-free operation. Stepper Motors offer high torque and smooth low speed operation.
Can a single phase motor be variable speed?
Speed control of single-phase induction motors is desirable in most motor control applications since it not only provides variable speed but also reduces energy consumption and audible noise. … Using microcontroller-based control systems, one can add speed variation to the system.
Can you control the speed of a motor?
AC motors are constant speed devices but their speed can vary if you change the input voltage or frequency or the windings that make the motor rotate. The most common and efficient way of changing the speed is to vary the frequency by using an inverter as the power supply.
Can I use a potentiometer to control AC motor speed?
If you mean that you want to control the speed of an AC fan with a potentiometer, it is probably not possible. Whether an AC “mains” fan can be speed controlled with a pot depends on the technology used. Single phase induction motor – capacitor start usually.
How do you slow down the rpm of an electric motor?
A couple of things you can do:
- Use gears to change ratio of speed, which is what you’re going to do. …
- Use a stepper motor, which are commonly used for high-torque, low RPM applications.
- Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.
Are all DC motors variable speed?
A: In general if you don’t do anything special to it, a DC motor will have variable speed. The main factors are the DC voltage applied to the armature coil and the amount of torque load you are trying to drive. In order to make it into a constant speed DC motor you have to have some sort of electronic feedback.
Can I put a VFD on any motor?
Output voltages are available for VFDs to match almost any existing motor voltage. However, very few, if any, VFDs have a direct 13,800-volt output for very high-voltage motors. For these cases, using a step-up transformer on the output of the VFD is often necessary to match the motor voltage.
Can you put a rheostat on any motor?
If using a rheostat for motor control it is essential to understand that all types of direct current motors could be speed-controlled, however, a small amount of AC motors are controllable with rheostats. … The smaller sized rheostats have screw-driver slots that make for easy adjustments.
Can you use a dimmer switch on a motor?
No you can’t use a dimmer switch to control a DC motor. A dimmer uses diac and triac and only works with AC which commutates the triac OFF at the end of every half cycle.
Can I use a 3-phase VFD on single phase motor?
You can almost always use a VFD rated for three phase input with a single phase input power source. When only a three phase input VFD is available, it is acceptable and common practice to de-rate the VFD to work with a single phase input power source.
How do I increase the rpm of my AC motor?
As several people have already stated, it is possible to increase the speed of an ac motor by increasing the input frequency to the motor. This is done in industry by adding a variable frequency drive.
How do you slow the speed of a motor?
Most DC motors can be slowed down by reducing the supply level of power, Volts, lower volts and resulting less amps, will create less electrical field and will slow motor down. For more gradual speed control there are electronic solutions that are called PWM (Pulse Width Modulation) controllers or Mosfet H bridges.