From Ametek Precision Motion Control – Dynamic Fluid Solutions
The traditional method for mounting copper or silver graphite brushes in brush-commutated DC motor and gearmotor assemblies has been to solder the brushes onto standard cantilever springs to enable the required constant contact with the commutator. This conventional spring design, however, carries inherent drawbacks: the amount of brush material that can be used is limited by the width of each spring where brushes are attached and, as brushes wear in an uneven pattern, force levels diminish over time and motor failure can result. Such challenges can be overcome by housing the brushes within a specially designed cartridge and utilizing torsion springs to ensure desired even force over the life of a motor. Cartridge brush housings also can serve as an ideal location for passive components for EMI suppression. The cartridge design allows these components to be placed closest to the noise source where they will prove most effective.
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Topics of Interest
Most mechanical-drive systems use springs and parts such as retaining clips and spring washers. Although relatively small and inexpensive, these components are often critical to the reliable...
9.1 Introduction The direct-current (dc) and synchronous motors we have discussed thus far have one thing in common: both are the doubly-fed type. These motors have direct current in their field...
Basic Components Two basic circuits are in any DC motor: the armature (the device that rotates, sometimes referred to as a rotor) and the field (the stationary part, sometimes referred to as a stator...
Brushless DC motors (BLDCs) achieve commutation electronically by utilizing a permanent-magnet rotor, wound stator, and rotor-position sensing scheme instead of a mechanical commutator or brushes...
When first introduced, brushless DC motors, despite their many advantages, were cast as a costly alternative to brush-commutated motors and were typically only specified for low-power applications...
