Servomotors – What are they?

Currently the servomotors are included in the category of special motors, being considered precision motors and can be applied in the most diverse activities, of which stand out the positioning systems; industrial robotics; transport lines; flexible manufacturing systems. The servomotors have a range of characteristics that distinguish them from the other engines and have a high dynamic, that is, they operate at several speeds with constant torque, they also have a strict torque control, that is, one can easily act on the torque of the servomotor to raise and lower without damaging the servomotor.

In addition to these features the servomotors have an enormous precision of their speed as well as the position of their rotor, due to the fact of their control devices. Servomotors 5600 EMP are currently divided into the following types: Alternating Current Asynchronous Servomotor, Alternating Current Synchronous Servomotor and Continuous Current Servomotor, Step Servomotors, Switch Reluctance Servomotors and Induction Servomotors. Prior to the increase in power electronics and magnetically hard materials, the servo motors were DC-powered having a brush-collector assembly. The torque control of this type of motors was quite simple and presented a good precision for the time.

Single-phase induction motor

The induction motor is single-phase at supply voltage and can be connected to a source with alternating low voltage output. In order to realize an electric induction motor, it is very important to produce a rotating magnetic field. Pulsing and oscillating magnetic fields are spontaneously generated by coils fed with alternating electric current (AC). The magnetic field at a point near a coil with this power will oscillate in phase with the alternating current whose frequency is 60 Hz. If we consider a point on the axis of symmetry of a coil, there will be a magnetic induction oriented along the axis of the coil, which will have its intensity and sense varying harmoniously in time with period of 1/60 s. reelcraft S601035-75

For portable systems batteries may be used, however, more constantly the circuits need to be fed from the available AC power grid. In these cases, there must be a part of the equipment that converts the alternating waveform of the grid to energy of the continuous type. All electronic circuits require a source of electrical power to “feed” them. In general, this power source is a source of continuous voltage.