Dynamic control of high-performance two-phase servomotors

A method for eliminating the electrical transients in high-performance sleeve induction motors is shown whereby response times of one millisecond can be achieved. Improved dynamic performance and a fivefold reduction in the standby power normally required are gained by using phase-modulated, variable amplitude inputs to both the control and reference windings. The reduction in the input power and response time is obtained at the expense of additional complexity in the drive system which requires a sinusoidal function generator and two multipliers. The proposed system will probably be most useful for critical applications such as in missile guidance control systems.