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However, a synchronous motor powered directly by a mains supply with constant voltage and frequency does have two disadvantages: - it is dificult to start; if it has no speed controller, it has to be no-load started, either directly for small motors or by a starting motor which drives it at a nearly synchronous speed before switching to direct mains supply, - it can stall if the load torque exceeds its maximum electromagnetic torque and, when it does, the entire starting process must be run again.

34 0,01 Gradual powering of the lamp also reduces, or even eliminates, the power surge when it is switched on. Note that light dimming: - alters the colour temperature, - shortens the life of halogen lamps when low voltage is maintained for long periods. The filament is not regenerated so efficiently at low temperature. 0,02 Current waveform Some halogen lamps are powered at low voltage through a transformer. Magnetisation in a transformer can produce power surges 50 to 75 times greater than the nominal current for a few milliseconds.

A Fig. 23 Torque speed characteristics of a slip ring motor Example of slip ring operation. 8 Cn, different speeds can be obtained as represented by the sign • in the diagram (C Fig. 23). For the same torque, the speed decreases as the rotor resistance increases. b Other speed control systems v Variable voltage regulator This device is only used in low-powered asynchronous motors. It requires a resistant squirrel cage motor. The speed is controlled by increasing the motor slip once the voltage drops.

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Automation Solution Guide by Shneider Electric


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