HORSEPOWER

SPEED       Use Exact

VOLTAGE

MANUFACTURER [ All ]ALLEN BRADLEY ALLISCHALMERS BALDOR ELECTROSTAT ELLIOTT FINCOR GENERAL ELECTRIC GENERAL ELECTRIC KINAMATIC LOUISALLIS MARATHON NORTHERN ENG WORKS POWERTRON RELIANCE SIEMENS TAMPER TOSHIBA UNICO USELECTRICAL WESTINGHOUSE

FRAME

WINDING [ All ] COMPOUND N/A PERMMAGNET SERIES SHUNT SPECIALCOMPOUND SPECIALSHUNT SSW STABSHUNT STAB SHUNT

Direct current motors, also known as DC motors, power machinery in much of heavy industry such as massive metal rolling mills, huge surface mining excavators, underground mine hoists, and many other industrial applications. The advantage of DC motors is speed control and they are typically used with an SCR controller in applications requiring adjustable speed and constant torque throughout the speed range. They are also used in applications requiring dynamic braking or adjustable speed/reversing. The field coils dictate the electrical characteristics of the motor. They exist in four basic formats: series, shunt, stabilized shunt and compound wound. Series motors lack good speed regulation, but are well-suited for high-torque loads. Shunt motors use high-resistance field windings connected in parallel with the armature and run at a constant speed however they tend to slow down under load. Compound motors have 50% series and 50% shunt windings and combine the electrical characteristics of both field windings. Stabilized shunt motors will stay constant over a much larger torque range than a shunt winding. A second field is wound over the top of the field above and is in series with the armature. It is a high current circuit and consists of only a few large conductor turns. Its purpose is to improve the torque-speed characteristic of the motor so, as the motor is loaded heavier and heavier, the torque either holds constant or increases slightly.