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DC Motors - RPM™ III - 1 to 396kW RPM III DC Motors are the third generation of Reliance motors, and are specifically “Performance Matched” for variable speed applications utilizing solid-state rectified power supplies. Available in IEC Frames with ratings 1 to 396kW and NEMA Frames C180ATZ-C440ATZ with ratings 1.5 to 500HP. Drip-Proof Guarded Force Ventilated or TEFC with Blower Cooling. RPM III PERFORMANCE ADVANTAGES • End brackets with integral feet provide more rigid mounting • Higher HP ratings per frame size • Quicker response, higher torque to inertia ratio • Smooth operation at low speeds • Laminated frame, sharply reduced eddy currents • Wider speed range capability • Longer brush life, better commutation • Simplified installation and service accessibility • Exclusive PLS® Positive Lubrication System • Specifically designed for rectified power |
| RPM III ADVANCED DESIGN FEATURES:
• New, larger armature diameters provide a significant increase in rating per frame size and improved torque-to-inertia ratios for quick response. Skewed armature designs also ensure smooth operation at low speeds. • Four-pole configuration extends speed ranges, improves linear torque-per-amp relationship and contributes to smoother, quicker response. • Field-proven square laminated frame construction improves commutation and heat dissipation, and requires less mounting space than round body motors. • Mechanically held commutator provides dynamic stability, eliminating high or low bars and undesirable thermal stress. • Computer designed frame and bracket eliminate vibration at any speed within the motor’s operating range and prevent the motor from being excited by harmonics in the rectified power supply. End brackets are cast iron with integral mounting feet, providing a rigid, vibration-resistant mechanical enclosure. • Radial brush holders with a unique pivoting brush finger and a constant-tension coiled spring ensure positive, continuous contact between the brush and commutator. This results in optimum commutation and better utilization of the brush length for up to twice the brush life. • Rotatable brush rigging assembly provides easier access to top and bottom brushes. (Access is through large hand hole openings in the side of the motor.) PLS lubrication system uses open bearings that run cooler for long life. Unique configuration of bearing cavity ensures proper bearing lubrication regardless of motor mounting position. It also eliminates possibility of damage to the motor or bearings due to overgreasing. • RPM III DC Motors are manufactured of quality materials with continual quality assurance of processes. RPM III, NEMA and IEC DC motors are manufactured in ISO 9001 certified facilities. |
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