More about Gearmotors
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Gearmotors can be of all sizes and types: single or multiphase, universal, servo, induction and synchronous. Each alternating current gearmotor comprises a set of three windings in the stator section, a basic rotating section and an integral gearbox. The rotor rotates when the 50-60 Hertz AC line voltage causes it to rotate around the axis of the motor. These AC motors are the simplest and most common type of motors manufactured. On the other hand, direct current gearmotors are manufactured in various types and sizes, such as brushless and servo.
What does a direct current gearmotor consists of? It comes with a rotor, a permanent magnetic field stator and an integral gearbox or gear head. The magnetic field is maintained using either permanent magnets or electromagnetic windings. Direct current gearmotors are most commonly used in variable speed and torque applications.
Permanent magnets or electromagnetic windings help maintain its magnetic field. Direct current motors find applications in variable speed and torque applications while a direct current servomotor is made up of an output shaft that can be set by sending a signal in coded language to the motor. As the input to the motor alters, the angular position of the output shaft changes accordingly. Though small and powerful, these gearmotors are very easy to control and operate.
A stepper motor is a kind of electric gearmotor that moves incrementally rather than turns smoothly as motors usually do. Usually, increments are measured in degrees such as 0.9 or 1.8°, with 200 or 400 increments making up a full circle. Its speed is calculated by the time delay between two incremental movements. In addition, there are also brushless direct current motors that work on external power drive to allow interchanging the coils on the stator. They serve specific applications, such as maintenance-free operation, high speeds, and hazardous environments where sparking could be dangerous.
When looking for gearmotors, important performance specifications to bear in mind are its shaft speed, continuous current, continuous torque and continuous output power. For alternating current motor specifications, look out for voltage, frequency, phase, and motor construction. Voltages and frequencies are usually 115/120V 60Hz; 208-230/240V 60Hz; and 460/480V 60Hz, among others, in single or three phases. Specifications of motors working on direct current include terminal voltage, motor construction and commutation.