Can you make any electric motor be variable speed? 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
Can you make any electric motor be variable speed?
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.
What does a variable speed control device do?
Variable speed drives (VSDs), also called adjustable speed drives (ASDs), are devices that can vary the speed of a normally fixed speed motor. In HVAC systems, they are used primarily to control fans in variable air volume systems instead of other devices such as inlet vanes and discharge dampers.
How does variable speed control work?
Variable speed drives supply specific amperage and voltage to a motor. If the supply power is in AC form, VSDs utilize a rectifier circuit to convert the AC to DC at a specified voltage and amperage that the drive can adjust. Changing the voltage of the DC changes the speed of the motor.
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.
What type of variable is speed?
Continuous variables
Continuous variables can take on an unlimited number of values between the lowest and highest points of measurement. Continuous variables include such things as speed and distance.
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.
What type of motor is variable speed?
There are three general types of variable speed drives- DC Motor drives, Eddy Current Drives, and AC Motor drives. Each type of variable speed drive can be divided into different variations. Every variable speed drive system will include an electric motor and a speed control unit.
Can you slow down a single phase motor?
Generally, single phase capacitor-start motors cannot be speed controlled. It’d be ok, but only for a narrow range of speeds. Once the speed reached the start winding switchover, speed control would be impossible.