Servo Motor Questions

Servo is used as a general term to mean servomechanism, servomotor, servovalve, servocontrol, etc. Electric motors used in a control system are not particularly special, although those marketed as servomotors may be designed and built with much more precision and out-of-the-ordinary operational characteristics. Nonetheless, servomotors are still motors.

Not only are servomotors electric motors, they can also be hydraulic motors, steam motors, etc. Electric motors can be DC with wound fields, PMDC (DC motor with permanent magnet fields), DC brushless (salient pole (permanent magnet) with wound stator, which is PMDC motor turned inside out), AC polyphase, and Stepper motors, etc.

Your use of the term Indextion motor makes me want to think you mean Induction (American spelling of English word) motor. Frame sizes of induction motors and those used in servo applications are rarely the same. However, there is no particular reason to not be able to find a motor with the same power in a similar- sized package. It is possible that a PMDC motor made with NdFeB magnets will be a fair amount smaller than any induction motor of the same HP.

Thanks Bill for your Valuable Answer. sorry for delay in the reply.

sevo means controlling or linear

According to Webster's Unabridged Dictionary, "servo" means:

ser·vo (sûr-vo), adj., n., pl. -vos, v., -voed, -vo·ing.
–adj.
1. acting as part of a servomechanism: servo amplifier.
2. pertaining to or having to do with servomechanisms: servo engineer.
3. noting the action of certain mechanisms, as brakes, that are set in operation by other mechanisms but

which themselves augment the force of that action by the way in which they operate.
–n.
4. Informal. servomechanism.
–v.t.
5. to connect (a mechanism) to another as a servomechanism.
[1945–50; independent use of SERVO-, taken as an adj., or shortening of words formed with it]

servo-,
a combining form used in the names of devices or operations that employ a servomechanism: servocontrol.
[extracted from SERVOMOTOR]

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"Linear" is not implied, nor is it in fact necessary to be a characteristic of a servomechanism or servocontrol system.