Motor Drive Controller

Motor Drive Controller

 

in an electric drive, a multiposition noncontact switch in which semiconductor devices (diode, transistor, or thyristor) serve as working elements. Motor drive controllers are widely used as a replacement for the commutator-and-brush apparatus in electric machines. Diodes and transistors are used for low-power machines, and thyristors are used for high-power machines. Motor drive controllers are reliable and have a high switching speed (more than 1 million per second). An electric motor drive controller circuit equipped with thyristors (1–6) is shown in Figure 1.

In an electric valve motor the armature winding is located on the stator and the field winding is located on the poles of the turning rotor. Direct current is fed to the armature winding through the thyristors in such a way that at any moment one thyristor from the cathode group and one from the anode group are conducting, so that electric current flows continuously through two phases of the armature winding. The frequency of thyristor switching determines the speed of rotation of the motor shaft.

Figure 1. Electrical circuit of a thyristor controller driving an electric valve motor connected to a DC supply: (M) electric valve motor, (W) armature winding, (F) field winding, (C) controller, (AG) anode group, (CG) cathode group, (U) supply voltage. (1) through (6) thyristors

REFERENCES

Beskontaktnye elementy i sistemy telemekhaniki s vremennym razdeleniem signalov. Moscow, 1964.
Tikhmenev, B. N., and L. M. Trakhtman. Podvizhnoi sostav elektricheskikh zheleznykh dorog, 3rd ed. Moscow, 1969.

IU. M. IN’KOV

References in periodicals archive ?
Such high voltages are typically found in industrial applications such as induction heaters or electric motor drive controllers.
With the new motor drive controllers, Grove was able to eliminate resistors and contactors used for torque and speed control - and avoid the associated expensive maintenance.