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Baldor expands its advanced range of permanent magnet ac motors
21 December 2011
Baldor has expanded its RPM ac range of super-high-efficiency, permanent magnet based motors, to power output levels of 900kW (1,200hp). This product line performs like 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 have high efficiency performance that exceed IE3 levels. This is achieved by virtue of its highly power dense, low loss rotor design where the permanent magnets are actually embedded within the rotor laminations. This enables the motor 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.
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 12,000rpm) - enabled through the use of Baldor's power matched PM ac drives.
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