GM4050-38 Servo Motor

The GM4050-38 permanent magnet brush servo motor uses traditional ferrite magnets, which are ideal for cost sensitive applications. It also uses higher inertia armatures, which provide improved motor to load inertia matching for medium to high inertia loads. This helps reduce mechanical shaft resonance and leads to higher servo gains for increased stability. In addition, this motor incorporates a skewed armatures, which provides low cogging torque and ultra smooth operation at all speeds. The GM4050-38 outputs up to 41.3 Lb-in (4.67 Nm) of continuous torque, and has a maximum speed of 3500 RPM. Industry standard English, metric, and NEMA mounting configurations are available.

Standard Features
Traditional ferrite magnet design, which are ideal for cost sensitive applications.
Skewed armature design provides ultra smooth operation (i.e. low cogging torque) at all speeds.
Constructed to withstand the toughest industrial environment with rugged, high performance bearings and TENV construction with IP54 sealing.
Worldwide standard mounting configurations are available.
Industry standard lead termination configurations. (i.e. MS connectors, fluid tight strain relief cable exit, NPT hole with flying leads and terminal boxes)
Shaft keyway.
Class H insulation.
UL Recognized Component for the US and Canada.
CE marked.
RoHS compliant.
Optional Features
Custom electrical windings are available to meet virtually any requirement as well as 380 and 460 VAC line voltages.
Custom mounting configurations are available to meet virtually any requirement.
Optional industry standard feedback devices. (i.e. high performance silver commutator tachometers, encoders and resolvers).
IP65 sealing is available for 3.3", 4.0", 4.9", and 6.0" frame size motors.
24 VDC holding brake.
Motor Type

Magnet Type


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Frame Size

Power (HP)

Power (kW)


Cont. Stall Rating (Lb-in)

Cont. Stall Rating (Nm)

Cont. Stall Rating (Amps)

Peak Stall Rating (Lb-in)

Peak Stall Rating (Nm)

Peak Stall Rating (Amps)

KT (Lb-in/A)

KT (Nm/A)



LA (mH)

Inertia (Lb-in-sec2)

Inertia (Kg-m2)