MV = High Efficiency +1~2%. While synchronous motors have higher efficiency and no slip, induction motors have good starting torque. The synchronous motor has no starting torque. Power factor is lagging in induction motor and unity in synchronous motor.
Besides, are synchronous motors expensive?
For reasons previously explained, synchronous motors are more expensive to produce, implement, maintain, and repair than induction motors. However, a case can be made that their energy savings and power-factor correction abilities may make up for their higher initial costs.
Beside this, what are the advantages of synchronous motor over induction motors?
One of the major advantage of using synchronous motor is the ability to control the power factor. An over excited synchronous motor can have leading power factor and can be operated in parallel to induction motors and other lagging power factor loads thereby improving the system power factor.
What are the disadvantages of synchronous learning?
Main disadvantages of synchronous learning:
- Both the student and the instructor have to adhere to time schedules.
- Much of the training depends on the quality of the instructor.
- Students may not receive individual attention if other students are also in need.
- The learning pace is set by the instructor, not the students.
What is difference between induction and synchronous?
Induction Motor. The fundamental difference between these two motors is that the speed of the rotor relative to the speed of the stator is equal for synchronous motors, while the rotor speed in induction motors is less than its synchronous speed.
What is the difference between synchronous motor and asynchronous motor?
Synchronous motor is a machine whose rotor speed and the speed of the stator magnetic field is equal. Asynchronous motor is a machine whose rotor rotates at the speed less than the synchronous speed. … Asynchronous motor does not require any additional starting source.
What is the main disadvantage of synchronous motors?
Disadvantages of Synchronous Motor
Synchronous motors require dc excitation which is supplied from external sources. These motors are not self-starting motors and need some external arrangement for its starting and synchronizing. The cost per kW output is commonly higher than that of induction motors.
Where are synchronous motors used?
In the fractional horsepower range, most synchronous motors are used where precise constant speed is required. These machines are commonly used in analog electric clocks, timers and other devices where correct time is required. In higher power industrial sizes, the synchronous motor provides two important functions.
Why does the synchronous motor always run at synchronous speed?
Synchronous motors run at synchronous speed. … In synchronous motors, the stator has 3 phase windings and is excited by 3 phase supply whereas the rotor is excited by DC supply. The 3 phase windings provide rotating flux whereas the DC supply provides constant flux.
Why induction motors are called asynchronous?
Because it runs at a speed less than synchronous speed. Because induction motor can not rotate at synchronous speed it always rotate less than synchronous speed. in short, induction motor never rotates at synchronous speed so it called asynchronous motor.