The Advantages and Hazards of DC Motors

DC Motors: Advantages and Hazards of running DC Motors What is a DC Motor? DC Motors convert electric energy into mechanical energy. A DC Motor uses direct current - in other words, the direction of current flows in one direction. A DC Motor usually... More

DC Motors: Advantages and Hazards of running DC Motors What is a DC Motor? DC Motors convert electric energy into mechanical energy. A DC Motor uses direct current - in other words, the direction of current flows in one direction. A DC Motor usually consists of: An armature core, an air gap, poles, and a yoke which form the magnetic circuit; an armature winding, a field winding, brushes and a commutator which form the electric circuit; and a frame, end bells, bearings, brush supports and a shaft which provide the mechanical support. See figure 8. There are two primary advantages to DC motors: speed variation and torque. Speed Variation Speed variation is accomplished by changing either the armature voltage or field voltage, or a combination of both. For example, a motor with a base speed of 1750 RPM and armature voltage of 500 VDC will run at 875 RPM with a 50% reduction in armature voltage (to 250 VDC). ARMATURE VOLTAGE CONTROL - For this type of speed control the armature volt Less