{"id":4299,"date":"2025-02-14T11:06:16","date_gmt":"2025-02-14T05:36:16","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=4299"},"modified":"2025-02-14T11:07:02","modified_gmt":"2025-02-14T05:37:02","slug":"two-phase-servomotor","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ee\/two-phase-servomotor","title":{"rendered":"TWO-PHASE SERVOMOTOR"},"content":{"rendered":"

SERVOMOTOR<\/h2>\n

For a low-power (~300 W) control application, 2-phase balanced servomotor driven by ac amplifier is used in control applications. The motor torque is controlled by varying the magnitude of ac voltage applied to the control phase (phase a) as shown in fig. (a).<\/p>\n

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The second phase called the reference phase is excited by a fixed voltage ac source. The control phase voltage is shifted in phase by 90\u00b0 from the reference phase voltage. The motor torque is reversed by phase reversal of the control phase voltage. For linear stable operation, the torque speed characteristics of the servo motor must be linear with negative slope (torque reducing with increasing speed). The torque speed characteristics of a normally designed induction motor is highly non-linear and is unstable for normal loads in the region from zero speed to speed at breakdown torque. This indeed is the useful region of operation of a servomotor employed in position control systems.<\/p>\n

This is obtained by designing a rotor with high resistance so that the maximum torque occurs at a slip of \u20130.5. Due to high rotor resistance, servo-motor does not develop single-phasing torque which may disturb the control characteristic of the motor.<\/p>\n

The torque-speed characteristic of a servomotor for various per unit values of phase voltage are drawn in fig. (c). Low-inertia construction is achieved by using a drag-cup rotor.<\/p>\n

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