Servo Motors and Controls
Indelsol is a leading provider of Electronics repair services specializing in Servo Motors and Controls.
Indelsol has a number of years experience in servicing and repairing these complex drives and controls. Our technicians are trained to understand the complexity and special attention needed to service Servo Motors and Controls.
We service A.C. and D.C Servo Motors with expertise.
Three basic types of servo motors are used in modern servo systems: ac servo motors, based on induction motor designs; dc servo motors, based on dc motor designs; and ac brushless servo motors, based on synchronous motor designs.
AC servo motors
In an ideal servo motor, torque at any speed is directly proportional to control-winding voltage. In practice, however, this relationship exists only at zero speed because of the inherent inability of an induction motor to respond to voltage input changes under conditions of light load.
Servomotors are wound with two phases physically at right angles or in space quadrature. A fixed or reference winding is excited from a fixed voltage source, while the control winding is excited by an adjustable or variable control voltage, usually from a servo amplifier. The windings are usually designed with the same voltage-turns ratio, so that power inputs at maximum fixed-phase excitation and at maximum control-phase signal are in balance.
The inherent damping of servo motors decreases as ratings increase, and the motors have a reasonable efficiency at the sacrifice of speed-torque linearity. Most larger motors have integral auxiliary blowers to maintain temperatures within safe operating ranges. Servomotors are available in power ratings from less than 1 to 750 W, in sizes ranging from 0.5 to 7-in. OD. Most designs are available with modular or built-in gear heads.
DC servo motors
Dc servo motor characteristics include inertia, physical shape, costs, shaft resonance, shaft configuration, speed, and weight. Although these dc servo motors have similar torque ratings, their physical and electrical constants vary.
DC Servo Motor Selection:
The final servo motor system design is usually the least sophisticated that meets the performance specifications reliably. Servo motor requirements may include control of acceleration, velocity, and position to very close tolerances. This says that the servo designer must define the system carefully, establish the servo motor’s performance specifications, determine critical areas, and set up tolerances. Only then will the designer be able to propose an adequate servo system and choose a servo motor type.