General Purpose – Aluminum Motors GP100A

General Description

For some people, ‘general purpose’ has become synonymous with marginal or bare-minimum quality. Not so with the SIMOTICS GP100A. These finned TEFC aluminum frame general purpose motors are very similar in construction and materials to our SD100 severe duty motors and cast iron GP100 motors, but are less costly because of the aluminum frame and moderate- environment design. High structural strength is ensured through the use of finite element analysis to strategically place material within each component to resist the effects of stress and vibration. Corrosion resistant materials are used liberally throughout for long life in a wide variety of industrial applications.

All GP100A motors are inverter duty and have their VFD ratings right on the nameplate. They are designed and manufactured to meet or exceed NEMA Premium® efficiency (MG1 Table 12-12); higher efficiency is available on many sizes with the optional copper rotor. A wide selection of options and QuikMOD modifications provide great flexibility to this reliable motor.

Performance Specification

HP Range

1 - 20 HP

Frame Size

140T - 250T


Die Cast aluminum


NEMA Premium ® (MG1 - Table 12-12)

NEMA Premium ® + (>MG1 - Table 12-12)




Service Factor

 1.15 @ 40ºC


Class F

Temperature Rise

Class B @ 1.0SF,

Class F @ 1.15SF

Conduit Box (Oversized)

Aluminum FS 140-250

Fan Cover



Die Cast Aluminum

Die Cast Copper

Inverter Duty

VT 20:1

CT 4:1

CT 10:1

Frame and End Shields

The SIMOTICS GP100A frame and end shields are thick, high-quality aluminum, as is the easy-to-access diagonally split, oversized heavy-walled terminal box. The terminal box features tapped conduit entry holes, a neoprene gasket and includes a heavy duty ground lug and clearly and permanently marked non-wicking leads. The feet are removable and can be reattached in different locations thus changing the terminal box location to F2 or F3. These characteristics plus high strength zinc-plated hardware and stainless steel nameplates provide exceptional structural integrity and make them ideal for material handling, pumps, fans, compressors and other applications in moderate industrial and commercial environments.

Rotor and Stator Windings

A unique offset rotor bar design provides improved efficiency, while larger bars and end rings reduce resistance for lower rotor losses. Each die cast aluminum rotor assembly is dynamically balanced for extended bearing life and includes a high-strength carbon steel (C1045) shaft for maximum rotor performance.

The stator is manufactured with premium electrical C5-grade steel laminations and copper electrical magnet wire that furthers the reduction of losses.


The proprietary Class F non-hygroscopic insulation system with NEMA Class B temperature rise provides an extra margin of thermal life. The varnish system ensures maximum winding penetration to provide protection from moisture, corrosion and electrical shock. This insulation system meets or exceeds NEMA MG1 2014 Part 31 making the motors suitable for variable speed drives in constant torque (4:1) and variable torque (20:1). All windings are tested for CIV.

Cooling System

A non-sparking, bi-directional fan is locked and keyed to the shaft. Its low-inertia design reduces windage losses, improves airflow, reduces noise and provides dependable cooling. A durable, rigid plastic fan cover is standard.


Double-shielded antifriction ball bearings are standard for the drive end.