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40PA58-53-TEFC-S Pacific Scientific

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The Pacific Scientific 40PA58-53-TEFC-S is a permanent magnet DC motor from the Permanent Magnet DC Motors series. It features a small adapter size, a TEFC enclosure, and is compatible with SRF53 motors. The motor offers both standard and alternate shaft diameters of 0.187 inches and 0.120 inches, and supports Servo-Tek tachometer models SA-757A, SA-7103A, and SA-7360-F-1.

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Product Description:

The 40PA58-53-TEFC-S is a permanent-magnet direct-current motor produced by Pacific Scientific within the Permanent Magnet DC Motors series. It converts electrical energy into rotational motion for conveyors, web handling, and indexing stations where speed is regulated through armature voltage rather than field excitation. In automated lines, it serves as a prime mover that couples with gearboxes or tachometer feedback devices to hold commanded velocity. Fixed magnets keep the frame compact and improve dynamic response.

The mechanical interface begins with a small adapter frame that fits tight mounting envelopes. The standard power path uses a 0.187 in shaft that is ground to tolerance so rigid couplings seat without eccentricity. For light instrument loads, Pacific Scientific offers an alternate stub of 0.120 in, reducing overhung mass on miniature pulleys and encoders. When that reduced diameter is selected, the mating hub is identified as ST-9502-1, ensuring concentric alignment under cyclic torsion. Thermal and contaminant protection comes from the TEFC enclosure; the totally enclosed fan-cooled housing directs air across external fins, allowing continuous duty while preventing airborne particles from reaching internal windings.

Integration with motion hardware is simplified because code -84 aligns with drive tables in Pacific Scientific controllers, eliminating custom tuning. The armature stack shares dimensions with the SRF53 compatible motor, so the same bracket geometry can be used without changes to belt tension or center distance. Speed feedback may be furnished by a Servo-Tek tachometer; three versions, SA-757A; SA-7103A; SA-7360-F-1, mount on the fan cover and supply a calibrated voltage proportional to rpm. These tachs support stable regulation during acceleration events when paired with the alternate shaft and adapter options.

Adapter Size
Small
Alt Coupling
ST-9502-1
Alt Shaft Dia
0.120 in
Compatible Motor
SRF53
Motor Enclosure
TEFC
Motor P/n Token
-84
Std Shaft Dia
0.187 in
Tachometer Brand
Servo-Tek
Tachometer Models
SA-757A; SA-7103A; SA-7360-F-1
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Frequently Asked Questions about 40PA58-53-TEFC-S:

Q: What type of enclosure does the 40PA58-53-TEFC-S motor use?

A: The 40PA58-53-TEFC-S features a Totally Enclosed Fan Cooled (TEFC) enclosure that protects the motor from dust and moisture.

Q: What is the standard shaft diameter on the 40PA58-53-TEFC-S motor?

A: This model includes a standard shaft diameter of 0.187 inches, allowing compatibility with a range of standard couplings.

Q: Which Servo-Tek tachometer models can be used with the 40PA58-53-TEFC-S motor?

A: The 40PA58-53-TEFC-S motor is compatible with Servo-Tek tachometers, specifically models SA-757A, SA-7103A, and SA-7360-F-1.

Q: What is the adapter size for the 40PA58-53-TEFC-S motor?

A: This motor is built with a small adapter size for compact installations.

Q: Which motor model is compatible with the 40PA58-53-TEFC-S?

A: The 40PA58-53-TEFC-S is compatible with the SRF53 model motor from Pacific Scientific.


Internal Product Review

  • ‘‘The 40PA58-53-TEFC-S is a Pacific Scientific permanent magnet DC motor built with a TEFC enclosure and a small adapter size. Compatibility with the SRF53 platform and Servo-Tek tachometer packages supports clean integration in precision motion assemblies. A solid choice for enclosed DC motor applications where stable feedback support is a priority.’’

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