# FAQ: Where Synchronous Motor Is Used?

## Why are synchronous motors used in electric clocks?

Synchronous motor, alternating-current electric motor designed to run at a speed that is directly proportional to the frequency of the electric power source. Small synchronous motors are used in applications in which constant speed is crucial, such as in electric clocks, timers, phonographs, and tape recorders.

## Why we use only synchronous motor as a generator?

A synchronous motor becomes a generator when the “load” driving the motor is stronger than the motor and can rotate the motor, overcoming the torque being produced by the motor. An example is a very heavy load being lifted by an electric motor driving a drum.

## What is the advantage of synchronous motor?

The advantages of the synchronous motor are the ease with which the power factor can be controlled and the constant rotational speed of the machine, irrespective of the applied load. Synchronous motors, however, are generally more expensive and a d.c. supply is a necessary feature of the rotor excitation.

## Why is it called synchronous motor?

Therefore the rotor rotates at the same speed that of the rotating magnetic field. It is due to the reason the motor is called as synchronous motor. It is a constant speed motor because, despite the increase in load motor runs at the same synchronous speed.

## Who is the father of clock?

Thomas Tompion (1639–1713) was an English clockmaker, watchmaker and mechanician who is still regarded to this day as the “Father of English Clockmaking”.

Thomas Tompion
Died 1713 London, England
Nationality English
Occupation Clock – and watchmaker

## What is synchronous speed?

Synchronous speed is a significant parameter for the rotating magnetic field-type AC motor. It is determined by the frequency and the number of magnetic poles. Synchronous speed No = [rps, revolutions per second] f = Frequency [Hz] p = Number of magnetic poles.

## What are the two types of synchronous generators?

Classification of Synchronous Generators | Electrical Engineering Hydroelectric Generators: The generators employed in hydroelectric power plants are three phase alternating current synchronous generators, called the alternators. Turbo Alternators: Diesel-Engine Driven Synchronous Generators:

## What are the applications of synchronous generator?

Synchronous generators are commonly used for variable speed wind-turbine applications, due to their low rotational synchronous speeds that produce the voltage at grid frequency. Synchronous generators can be an appropriate selection for variable speed operation of wind turbines [166,167].

Synchronous motors requires dc excitation which must be supplied from external sources. Synchronous motors are inherently not self starting motors and needs some arrangement for its starting and synchronizing. The cost per kW output is generally higher than that of induction motors.

## What is the main disadvantage of synchronous motors?

The disadvantages of Synchronous motor includes: 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.

## What is the most efficient motor?

Most efficient vehicle in the world uses brushless motor in drivetrain. One little hydrogen fuel-cell vehicle holds the Guinness world record for the most efficient vehicle … and uses a slotless brushless 60L-H-175-A from Koford Motors to drive its rear power wheel.

## What is difference between induction motor and synchronous motor?

A three-phase Synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine. The armature winding of the Synchronous motor is energized from an AC source and its field winding from a DC source. The stator winding of Induction Motor is energized from an AC source.

## Are synchronous motors AC or DC?

A synchronous electric motor is an AC motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles. The synchronous motor and induction motor are the most widely used types of AC motor.

## What is the principle of synchronous motor?

Working of synchronous motors depends on the interaction of the magnetic field of the stator with the magnetic field of the rotor. The stator contains 3 phase windings and is supplied with 3 phase power. Thus, stator winding produces a 3 phased rotating Magnetic- Field.