stepper motor

Stepper Motor working principle

Stepper motor is a special type of synchronous motor which is designed to rotate a specific number of degrees for every electric pulse received by its control unit. Typical steps are 7.5 or 15 degree per pulse. It is a motor that can rotate in both directions, move in precise angular increments, sustain a holding…

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sf6 circuit breaker

Sulphur Hexaflouride (SF6) Circuit Breakers

A circuit breaker in which the current carrying contacts operate in  sulfur hexafluoride or SF6 gas is known as SF6 circuit breaker. SF6 is a very good dielectric material which can resist high potentials.SF6 gas is used as the arc quenching medium Sulfur Hexafluoride (SF6) is an electro-negative gas and has a strong tendency to absorb free electrons. Whenever circuit breaker opens…

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Vacuum Circuit Breaker VCB

In such vacuum circuit breaker, the arc quenching medium is vacuum (degree of vacuum being in the range from 10-7 to 10-5 torr ). As vacuum is height insulating strength, so the vacuum has far superior arc quenching than others medium. When contacts of breaker are opened in vacuum, the interruption occurs at first zero…

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Synchronous Motor & Types, Uses, Advantages

A synchronous electric motor is an AC motor distinguished by a rotor spinning with coils passing magnets at the same rate as the alternating current and resulting magnetic field which drives it. Another way of saying this is that it has zero slip under usual operating conditions. Contrast this with an induction motor, which must…

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