Baldor Electric recently expanded its RPM AC permanent magnet (PM) product offering up to 1,200 hp (895 kW). According to the company, the RPM AC motor product line performs like a high-horsepower servo motor with low rotor inertia and high power density, and is now available in NEMA frame sizes 180, 210, 250, 280 and 440 with permanent magnet rotor construction. PM rotor technology offers improved efficiency that can translate into increased power density and synchronous (non-slip) speed performance. The addition of the 440 frame size to the RPM AC PM product family significantly increases the product horsepower range with synchronous speed performance. RPM AC PM motors are currently stocked as totally enclosed, blower-cooled TEBC ratings up to 150 hp (112 kW) with resolve feedback. The addition of the finned laminated 440 frame (FL440) extends the product line’s horsepower range to 800 hp (596 kW) enclosed blower-cooled and 1,200 hp using open force-ventilated construction. The RPM AC PM product line is currently available in both NEMA and IEC (112, 132, 160, 180 and 280) frame sizes. These motors are all designed to provide continuous constant torque performance from zero speed up to base speed for use with closed-loop PM AC drives.

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