Why are Motors That Important to Everyday Life?
Looking around you, most of the things you probably see are motorized – or has a motor running it. Cars, appliances, electrical / electronic machines, power tools, are just some of the ordinary items powered by motors. Most people may not realize it, but motors are just everywhere and they are not likely to go anywhere, anytime soon.
Motors can be electrical – a machine that is powered by electricity which was converted into a mechanical motion, or DC – a machine that runs on DC or direct current electricity. DC motors are of two types – a brushed motor which has a mechanical commutation system based on brushes, and a brushless motor which is a synchronous electric motor powered by direct current electricity and has a commutation system that is electronically controlled.
Brushless motors have permanent rotating magnets and a fixed armature or rotor that eliminates problems associated with connecting current to the moving rotor. Replacing the brush and commutator assembly found in brushed DC motors, is an electronic controller that constantly switches the phase to the windings allowing the motor to turn. The function of the controller is the same as that of the brush/commutator system.
There are several advantages of brushless motors over brushed DC motors, some of which are:
- More torque per weight
- Increased efficiency because they have more torque per watt
- Reduced noise
- Longer life cycle because there is no brush and commutator erosion
- Eliminated ionizing sparks from the commutator
- Reduced electromagnetic interference (EMI)
Brushless motors are used in various applications including medical, industrial, aerospace, and pump. Electrical vehicles, domestic and commercial HVAC (heating, ventilation and air conditioning) systems, industrial engineering and motion control spaces, are the other industries that benefit from brushless motors. Model aircrafts and helicopters also use brushless motors.
Disadvantages of Brushless Motors
While there are numerous applications using brushed motors already shifting to brushless motors, there are a few reasons which might prevent the changeover for other industries. Foremost is the high initial cost which is mainly due to its advantageous construction. Brushless motors require controllers to operate, and additional system wiring to power the circuitry – these are the other reasons why some applications retained usage of brushed motors.
Can you see other things that use brushless motors?