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

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Why is the neutral point of a star connected winding of a motor not grounded?

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