Do PAYBACK variable speed drives cause additional motor heating?
The magnetic coupling is electrically isolated from the motor and in effect operates as an infinitely variable, frictionless clutch, allowing the motor to operate as originally designed, at full speed continuously, and with pure uninterrupted ac power. Regardless of the drives’ operating speed, the motor never sees any additional heating contributed by the drive. In fact, any additional heat is dissipated by the drive itself, via slip, and not the motor. Since these new drives are efficiently sized to handle the full rated horsepower of these types of loads, the minimal amount of drive heating is effectively dissipated by the drives’ own integral fan. Since the motor runs continuously and the drive is simply controllably coupling and uncoupling the load, the effect of the motor loading is no different in operation than if you had incorporated an infinite number of pulley sizes to provide variable speed to the load.
