Baldor expand RPM AC motor range
Super-high-efficiency permanent magnet-based motors are now available in more IEC frame sizes
BALDOR have expanded their RPM AC motor range with power output levels of up to 900kW (1,200hp).
The RPM AC motor product line performs similar to a high-power servo motor with very low rotor inertia and high power density, and is now available in IEC frame sizes 112, 132, 160, 180 and 280 with permanent magnet (PM) rotor construction.
The addition of the 280 frame size to the RPM AC PM family significantly increases the product power range with synchronous speed performance.
The latest addition of the finned laminated 280 frame version – the DL280 – extends the product line’s power output range to 600kW (800hp) in totally enclosed blower-cooled (TEBC) IP55 form, and 900kW (1,200hp) using open force-ventilated, IP23-type construction.
Baldor RPM AC PM motors deliver high-efficiency performance that exceed IE3 levels. This is achieved by virtue of their highly power dense, low-loss rotor design where the permanent magnets are actually embedded within the rotor laminations.
This allows the motors to run cooler than conventional PM motors where the magnets are affixed to the outer surface of the rotor. This benefit can also lead to a smaller frame size in comparison to conventional PM motors.
According to Baldor, PM rotor technology offers improved efficiency that can translate into increased power density with smaller frame sizes per unit of output power and synchronous (non-slip) speed-control performance.
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.
The PM rotor technology allows the motor to operate at very low speeds, negating the need for a gearbox in the power train, and is equally capable of operating at very high speeds (up to 12,000 rev/min) through the use of Baldor’s power-matched PM AC drives.
The RPM AC PM motor line is currently available in both IEC and NEMA frames (180, 210, 250, 280 and 440 frame sizes).
