1)Synchronous motors are those that run only at Synchronous speed i.e. constant speed. But Motor can run in various speeds.
2)Synchronous motors runs at same speed of magnetic filed. but if one consider case of induction motor the rotor rotates at different speed than revolving magnetic field. there is slip between field and rotor.
Synchronous motors operate at the Synchronous speed of the motor which is governed by the frequency of the applied voltage. The slip of the motor (the ratio of the difference between the synchronous speed and the rotor speed to the synchronous speed) is zero.
Asynchronous motors operate at speeds lower than the Synchronous speed of the motor. These motors have a positive slip.
The construction of the primary part of the two motors is identical. The three phase windings are imbedded in the primary part, through which the current flows. The secondary part of the asynchronous and the synchronous linear motors are different. With the asynchronous linear motor, the secondary part is magnetized through the inductive current in the short circuit cage. Unlike the asynchronous motor, the secondary part of the synchronous motor is permanent magnets.
ASYNCHRONOUS is a mode whereby events happens irregardless of control. SYNCHRONOUS are this same events but controlled by a timing and/or control
Slip, , is defined as the difference between synchronous speed and operating speed, at the same frequency, expressed in rpm or in percent or ratio of synchronous speed. Thus
The big difference is that the synchronous motor's rotor can have a variable current applied to it through its field slip rings. Both types of motors have their own advantages. With a synchronous motor in the system, the systems power factor can be regulated.
The difference between crown motors and regular motors is that crown motors is a company, and regular motors are not. Regular motors, are the motors that can be found under a car hood.
Synchronous motors have unmeasureable slip because they stay in sync with the input line frequency.
ASYNCHRONOUS is a mode whereby events happens irregardless of control. SYNCHRONOUS are this same events but controlled by a timing and/or control
Synchronous AC motors run at a speed fixed by the input line frequency. Typically 60 Hz in the USA. Run a clock with the sync motor from the USA in England and it runs slow because they use 50Hz. Asynchronous motors run at whatever free-run speed they feel like, and slow under load. A DC wound hand-drill is such a motor, runs pretty fast till you start drilling, then it slows down. A synchronous motor will develop maximum power at its' designed speed, try to slow it down and it puts out more torque. Slow it down by overload, it doesn't create more power, it just creates more heat. An Async motor creates highest torque at stall speed, least torque as it approaches maximum speed.
Synchronous motors are those that run only at Synchronous speed ie.. constant speed.
Slip, , is defined as the difference between synchronous speed and operating speed, at the same frequency, expressed in rpm or in percent or ratio of synchronous speed. Thus
The difference between crown motors and regular motors is that crown motors is a company, and regular motors are not. Regular motors, are the motors that can be found under a car hood.
The big difference is that the synchronous motor's rotor can have a variable current applied to it through its field slip rings. Both types of motors have their own advantages. With a synchronous motor in the system, the systems power factor can be regulated.
Synchronous motors have unmeasureable slip because they stay in sync with the input line frequency.
Synchronous AC motors run at a speed fixed by the input line frequency. Typically 60 Hz in the USA. Run a clock with the sync motor from the USA in England and it runs slow because they use 50Hz. Asynchronous motors run at whatever free-run speed they feel like, and slow under load. A DC wound hand-drill is such a motor, runs pretty fast till you start drilling, then it slows down. A synchronous motor will develop maximum power at its' designed speed, try to slow it down and it puts out more torque. Slow it down by overload, it doesn't create more power, it just creates more heat. An Async motor creates highest torque at stall speed, least torque as it approaches maximum speed.
Becoz it use frequecy to start
Types of AC MotorsClassification Based On Principle Of Operation:(a) Synchronous Motors.1. Plain2. Super(b) Asynchronous Motors.1. Induction Motors:(a) Squirrel Cage(b) Slip-Ring (external resistance).2. Commutator Motors:(a) Series(b) Compensated(c) Shunt(d) Repulsion(e) Repulsion-start induction(f) Repulsion induction
Your question can not be answered as it is. Reword the question - is it about induction motors or synchronous motors, for example?
Synchronous motors have no slip. This is because the rotor runs at the same speed as the speed of the rotating magnetic flux of the stator.