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From Miyachi Unitek Corporation
Commutator fusing was developed in the early 1950's as a method of manufacturing small universal or DC electric motors. The early process of attaching wires to the commutator required dipping the commutator into a solder bath, and hand soldering the connections. This two-step process was not only difficult, time consuming, and therefore, expensive, but also emitted dangerous lead pollutants into the atmosphere. Furthermore, if a soldered armature's motor stalled or overloaded, there was a chance the solder might remelt and "spit out" contaminating the commutator and damaging the armature's coil. If enough solder left the joint, the wires could become free from the commutator and destroy the connection. As production increased, cost reductions, along with process quality improvements, were needed. Thus, the process changed from soldering to fusing, a method of joining low resistance metals through the use of mechanical actions and resistance welding controls. Product Announcements
Topics of Interest
The process of steering current through the appropriate motor windings in order to produce output torque is called commutation. In brush motors, commutation is accomplished electro-mechanically via...
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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...
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Sources of Unbalance
When a rotor assembly reaches the balancing machine it has normally been the subject of a number of machining and assembly operations. Each of these operations can contribute to...
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Wave soldering is a widely applied mass soldering method for electronic boards. Wave soldering or flow soldering uses a molten solder bath with a traveling wave. Printed circuit boards are positioned...
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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...
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