Answer / md. obaydur rahman

A servo motor rotates very accurately to the user's
direction with a joystick and other controller while an
induction motor spins when it is given power.

Three basic types of servo motors are used in modern servo
systems: ac servo motors, based on induction motor designs;
dc servo motors, based on dc motor designs; and ac brush
less servo motors, based on synchronous motor designs.

Servos have small electric motors in them that provide
power. The motor has a rotor with two attached to it, one on
either side. There are two magnets outside of the motor,
also on either side. When current flows through both coils,
a magnetic field which turns the rotor so that they face the
magnets. When the coils pass their magnets, they get another
pulse of electricity, pushing them towards the other magnet.
The rotor gets two strong pushes every rotation, which keep
it turning. The motor is attached by gears to the control wheel

why need of ac exietation in alternater.

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Initially motor starts with star connection ,after few timing changes to delta connection, why the motor should run continously in star connection,it gives high torque & low current?

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power generation unit kw/hr or kw/day ?? please answer me engr_kalam@yahoo.com

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when we switch on the switch and load is not connected at home,is electricity wasted?

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If we have 15000kw connected load in a factory than how much power demand sanction should be taken from electricity board. Pls provide complete calculation.

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I am working as maintenance engg. in electrical but i want to do carrier in electrical drawing.Tell me about that.

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