By Shneider Electric
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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. Its use was fairly widespread in cooling systems, pumps and compressors, uses for which its torque availability gives satisfactory results. It is gradually giving way to more cost-effective frequency converters.
A Fig. 1 An induced current is generated in a short-circuited shading ring Let’s take a shading ring ABCD in a magnetic field B, rotating round an axis xy (C Fig. 1). If, for instance, we turn the magnetic field clockwise, the shading ring undergoes a variable flux and an induced electromotive force is produced which generates an induced current (Faraday’s law). According to Lenz’s law, the direction of the current is such that its electromagnetic action counters the cause that generated it. Each conductor is therefore subject to a Lorentz force F in the opposite direction to its own movement in relation to the induction field.
B Squirrel cage single-phase motors For the same power, these are bulkier than 3-phase motors. Their efficiency and power factor are much lower than a 3-phase motor and vary considerably with the motor size and the manufacturer. In Europe, the single-phase motor is little used in industry but commonly used in the USA up to about ten kW. Though not very widely used, a squirrel cage single-phase motor can be powered via a frequency converter, but very few manufacturers offer this kind of product.