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Call:1-888-551-3082 International: 1-919-443-0207
Call:1-888-551-3082 International: 1-919-443-0207


Original price $3,061.13 - Original price $3,061.13
Original price
$3,061.13 - $3,061.13
Current price $3,061.13
Available, Shipping Varies
The 55NM81-020-5-CTRL is a low-inertia DC servomotor from Pacific Scientific's 55NM series. This motor uses Alnico V-7 magnetic material for its permanent magnets, with no forced air cooling or optical encoder included. An analog tachometer is built in, and the shaft diameter at the drive end ranges from 0.469 to 0.53 inches. With a 3.1A to 5.7A continuous current range and 18V to 36V voltage rating, this servomotor is designed for applications that do not require speed control. It features a rotor inertia of 0.01 oz-in and weighs approximately 10lbs. The device is also used in toys and car windows. The magnets in the motor are alternately aligned to the armature's South and North poles, and the armature core is constructed of slotted circular laminated steel sheets with varnish insulation to reduce rotor eddy current loss.
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Technical Specifications
  • Product: 55NM81-020-5-CTRL
  • Manufacturer: Pacific Scientific
  • Type: Low inertia servomotor
  • Series: 55NM
  • Material: Alnico V-7 magnetic material
  • Cooling Support: None
  • Tachometer: Analog
  • Sequence Number: Pre-assigned
  • Shaft Diameter: 0.469 - 0.53 inches
  • Delivery: Worldwide
  • Continuous Current: 3.1A to 5.7A
  • Voltage Rating: 18V to 36V
  • Magnet Housing: Stator
  • Rotor Inertia: 0.01 oz-in
  • Weight: 10lbs
  • Application: Motor speed control not required
  • Stator Makeup: Steel cylinder
  • Magnet Positioning: Inner periphery of the cylinder
  • Armature: Brushes and commutator
  • Application Fields: Toys, automobile windows
  • Magnet Arrangement: South and North pole facing armature alternatively
  • Rotor Core: Steel sheets with slotted circular lamination and varnish insulation
  • Eddy Current Loss Reduction: Through core material
  • Speed Control: By controlling magnetic field.

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