ONLINE ELECTRICAL ENGINEERING will contain ELECTRICAL ENGINEERING QUESTIONS & ANSWERS,ELECTRICAL INTERVIEW QUESTION & ANSWERS and important topics from ELECTRICAL MACHINES, POWER SYSTEMS ,POWER ELECTRONICS AND DRIVES and other ELECTRICAL ENGINEERING SUBJECTS.Objective tests will be conducted periodically which would be useful for exams like POWERGRID , NTPC ,NHPC ,ENGINEERING SERVICES ,IES ,ETC..FEEL FREE TO ASK YOUR DOUBTS REGARDING ELECTRICAL SUBJECTS.
Saturday, May 8, 2010
TYPES OF MOTORS
Motors are the electromagnetic devices which converts electrical energy into mechanical energy.Its working is based up on the principle that when a current-carrying conductor is placed in a magnetic field,it experiences a mechanical force whose direction is given by Fleming's Left hand rule.
Basically motors are classified based on the input electrical supply.They DC motors and AC motors.
DC motors are further classified as
i) Separately excited DC motor.
ii) DC shunt motor.
iii) DC series motor.
iv) DC compound motor.
Classification of AC motors are given as
a)Squirrel cage induction motor.
b)Slip-ring or wound rotor induction motor. Other motors which come under special machines are i) Stepper motor. ii) Brushless DC motor. iii) Switched Reluctance motor. iv) Variable Reluctance motor.