January 16, 2012 — NovaTorque introduces Gen2.0 PremiumPlus+ brushless permanent magnet motors. Driven by variable frequency drives, they have motor-only rated point efficiencies of 93.0 percent and 92.0 percent for 3hp and 5hp versions respectively, far exceeding the levels achieved with induction motors.
By comparison, 3hp and 5hp NEMA Premium induction motors, when driven by variable frequency drives, achieve a motor-only efficiency of between 88.5 and 90.0 percent. In addition to having higher efficiency at the rated point, NovaTorque’s PremiumPlus+ motors maintain their high efficiency over a much wider speed and load range.
For example, in a variable speed, variable torque application such as a fan or pump, a 50 percent reduction in speed results in a 75.0 percent reduction in load. At that reduced load, NovaTorque motors will maintain efficiency of approximately 91 percent, whereas a NEMA Premium efficiency induction motor will have declined to 80 percent.
Importantly, due to its unique patented flux-focusing stator and rotor hub geometry, the NovaTorque motor produces this performance with an all-ferrite (versus rare earth) magnet design. NovaTorque PremiumPlus+ motors are packaged in standard NEMA frame sizes and mounting dimensions for easy substitution. Due to their high power density, NovaTorque motors are available both in the mounting frame size typical for induction motors, as well as one frame size smaller. NovaTorque PremiumPlus+ motors are compatible with readily available variable frequency drives (VFDs) from most leading manufacturers, including ABB, Yaskawa, Mitsubishi, Fuji, Hitachi, Toshiba and others.
