Low-cost alternative to ironless-core motors

Oct. 5, 2000
New 22-mm iron-core motors use smaller, more powerful neodymium magnets, allowing for a larger, heavier iron armature than typically used in ironless-core motors.

New 22-mm iron-core motors use smaller, more powerful neodymium magnets, allowing for a larger, heavier iron armature than typically used in ironless-core motors.


A new 22-mm iron-core motor features a brush end bell that incorporates a printed-circuit board as well as RFI-suppression components. The RFI-suppression components are placed inside next to the noise source — the brushes — which greatly reduces RFI emissions. Because the motors use powerful neodymium magnets, as opposed to conventional ceramic magnets, less magnet material is needed. This let designers allocate more space for the iron armature that is larger and heavier than typical armatures in ironless-core motors. The larger rotor in the motor puts more power in a smaller package.

Another design feature increases brush life. Typical ironless-core motors use cantilevered springs which can place excessive forces on brushes, and cause wear. The redesigned cartridge brush uses spring loading that optimizes brush force throughout the life of the motor. The assembly varies the force on the brushes, from the beginning of the motor's life to the end of brush life, providing just enough push on any remaining brush material until it is completely gone.

The motors and gearmotors are available in two lengths — 1.256 and 1.556 in. — and provide peak torques up to 5.3 oz-in. with speeds of more than 8,000 rpm. They can be customized with rear-exiting leads or terminals, optical encoders, and other options.

Portions of this article were contributed by John Marks, Pittman Engineering, 343 Godshall Dr., Harleysville, PA 19438-0003, (877) 748-8626, fax: (215) 256-1338, www.pittmannet.com

Sponsored Recommendations

Altech's Liquid Tight Strain Relifs Catalog

March 13, 2024
With experienced Product Engineers and Customer Service personnel, Altech provides solutions to your most pressing application challenges. All with one thought in mind - to ensure...

Industrial Straight-Through Cable Gland

March 13, 2024
Learn more about Altech's cable glands and all they have to offer for your needs!

All-In-One DC-UPS Power Solutions

March 13, 2024
Introducing the All-In-One DC-UPS, a versatile solution combining multiple functionalities in a single device. Serving as a power supply, battery charger, battery care module,...

Smooth Sorting with SEW-EURODRIVE!

Feb. 22, 2024
Sorting systems are essential when it comes to warehouse automation, material handling, and distribution. SEW-EURODRIVE’s automated sorting solutions increase capacity, reliability...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!