Motor Field Current Reduction
DC motors are utilized in many industrial settings that require variable speed and torque applications. Because of the simplistic design and ease of control with DC motors, many companies choose to order control products for their DC motor rather than replace it with a newer type motor (AC motors). DC motors use a permanent magnet field, which is produced either using permanent magnets or electro-magnetic windings. A common problem experienced with DC motors is “loss of field.” This can cause the motor to accelerate to its fastest speed (based on loading speed), but can permanently damage the motor, especially if this happens with a lightweight load.
Motor control manufacturers such as Carotron, Inc. can provide Field Economy Options (field supply assembly) for motor field current reduction. The reduction occurs after an adjustable time delay. This reduces excessive heating that can occur in the motor windings when the motor remains idle for an extended period of time. The benefits? Motor field current reduction minimizes the build up of moisture, speed drift, and any problems that can occur during a cold start-up. This particular Field Economy OPtion can be used with a 3 phase input DC motor control product.