![]() EC motors are equipped inside with a printed circuit board (PCB) and logic control to know when to turn on or when to apply more or less power. The EC motor is considered a 'Smart' motor because of the use of technology to make it run. ![]() Here's another Electrical 121 explanation and diagram:Įlectronically Commutated Motor (EC or ECM) But at 40 to 60 percent efficiency, they're nothing to write home about. The construction is more sophisticated than a slotted pole motor with slotted windings inside the stator (the stationary part of the motor's rotary system.) PSC motors are able to run at single or multiple speeds, depending on the application. A PSC motor has a capacitor that helps run the motor and helps give it more torque or force. Because of their widespread use in HVAC/R applications, PSC motors are probably the most common type of motor. Where a shaded-pole motor is considered old design and old technology, a PSC motor is more middle of the road. Here's an excellent description and graphic from Electrical 121 website: While it's the least expensive of the three types of motors, at 30 percent efficiency, it's also the least efficient. They're usually single speed, low horsepower motors used for things like light ventilation. There's nothing terribly sophisticated about a shaded-pole motor. ![]() This trusty motor is your standard single-phase AC induction motor. ![]() But what's the difference between EC motors and other traditionally used motors like shaded pole motors or permanent split capacitor (PSC) motors? How much will those differences cost you and more importantly, save you? Let's spend a few minutes comparing shaded pole, PSC and EC motors. We write a lot about electronically commutated motors, sometimes called EC Motors or ECM. ![]()
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