Abstract
In servo-mechanism, the alternating torque of 2-phase sevro-motor causes undesirable problems.
In this paper, the operation of a 2-phase servomotor under an unbalanced voltage supply is analysed by means of the elementary method and the 2-phase symmetrical component method.
In studying and comparing the results obtained by the two methods, an equation is derived to calculate the alternating torque by using the equivalent circuit parameters.
The equation is simplified by introducing the specific relation among the equivalent circuit parameters of 2-phase servomotor.
An experiment was performed with the test 2-phase servomotor.
The amplitude of acceleration was recorded by a 2-phase induction generator type accelerometer. The alternating torque was calculated from the recorded data to be compared with the calculation by using the above equation. The agreement was satisfactory.
