The Engineering Department

Molon is an engineering driven company. Great emphasis is placed on the personnel assets and the equipment employed in the engineering discipline. Accordingly, all engineers are degreed, some with advanced degrees and state accreditation. Test and diagnostic equipment is periodically upgraded, and today it can be classed as state of the art.
Design Helps
The following sections present helpful information as a guide in selecting the right motor for customer applications. Included are helpful formulas, construction of permanent magnet DC motors and selection of motors.

Value Added

Molon’s engineering department is available at all times to assist not only in the motor design, but evaluation of associated systems interfaces and total product performance evaluation. In addition, we are pleased to assist the customer in pursuing approval and certification through UL and CSA as an added value to Molon’s commitment to engineering service.

Construction of the Permanent Magnet DC Motor

The basis for Molon’s wide selection of DC motors and gear motors is the permanent magnet DC motor. Relatively inexpensive and compact when compared to shaded pole and PSC motors, the PM DC motor is characterized by:

Motor Housing deep drawn heavy gage sheet metal with pressed- in pre-lubed bearings. High energy ceramic magnets are twin halves pressed into the housing and trapped with spring retainers.
Armature The armature has an odd number of armature slots and commutator bars to minimize cogging. The coils are wired into the commutator bars, which interact with the brushes I the plastic end bell. The disc varistor or capacitor , if specified, will help arrest electronic noise(EMI or EFI) generated by the brush action on the commutator. This is important is some applications utilizing electronic circuitry.

As in AC motors, the level of coil resistance is an indicator of power available. A coil of fewer turns of a heavier wire is associated with higher power motors (and also lower voltage motors.)
Although the brushes are not designed for replacement like in larger DC motors, the relatively low cost and reasonable long life of this design mitigates replacements of brushes.

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