Frequent question: Which motor is used in recording instruments?

5. Which of the following motor is used in recording instruments? Explanation: Reluctance motor is used in recording instruments. It is used for many constant speed applications.

Which motor is used in industry?

3-phase AC induction motors are the most widely used motors in industrial and commercial applications.

What is switched reluctance motor?

The switched reluctance motor (SRM) is an electric motor that runs by reluctance torque. Unlike common brushed DC motor types, power is delivered to windings in the stator (case) rather than the rotor. … Its main drawback is torque ripple.

What are the different types of electric drives?

Types of Electrical Drives

  • AC Motor drives. …
  • DC Motor drives. …
  • Individual. …
  • Multi Motor. …
  • Group Drive. …
  • Constant Speed drive. …
  • Variable Speed drive. …
  • Vector Control Drive.

Which of the following is true for switched reluctance motor?

Switched reluctance motor (SRM):

The rotor has no windings; magnet or cage windings but is built up from stacks of salient pole laminations. It is a stepper motor with closed loop control and with rotor position sensor. It is designed for high speed and the closed loop system is necessary.

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Which motor is used for elevators?

DC cumulative compound motor having high starting torque up to 450% depending upon the degree of compounding. The speed regulation is varying up to 25 ~ 30%. That’s why these motors are used in elevators.

What type of motor used in ships?

Most modern larger merchant ships use either slow speed, two stroke, crosshead engines, or medium speed, four stroke, trunk engines. Some smaller vessels may use high speed diesel engines. The size of the different types of engines is an important factor in selecting what will be installed in a new ship.

What is torque ripple in motor?

Torque ripple is an effect seen in many electric motor designs, referring to a periodic increase or decrease in output torque as the motor shaft rotates. It is measured as the difference in maximum and minimum torque over one complete revolution, generally expressed as a percentage.

How does SRM motor work?

The working principle of the switched reluctance motor is, it works on the principle of variable reluctance that means, the rotor of this motor constantly tries to align through the lowest reluctance lane. The formation of the rotary magnetic field can be done using the circuit of power electronics switching.

Is SRM DC or AC motor?

A Switched Reluctance Motor (SRM) are considered as DC motors that emulate the behaviour of an AC motor by switching the DC current between the stator windings.

What is AC motor drives?

AC Motor Drives Information. AC motor drives are defined as amplifiers or frequency inverters that interface between a controller and an AC motor. They convert step and direction input from the controller to currents and voltages compatible with the motor.

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What is a DC motor drive?

DC motor drives are defined as amplifiers or power modules that interface between a controller and a DC motor. … DC motors tend to be less complex than AC motors and are normally less expensive for most horsepower ratings. They are capable of providing large startup torques exceeding 400% of the rated continuous torque.

Which motor is used in AC drive?

The AC electric motor used in a VFD system is usually a three-phase induction motor. Some types of single-phase motors or synchronous motors can be advantageous in some situations, but generally three-phase induction motors are preferred as the most economical.

Which motor is generally used in electric shaver?

(D) Permanent split capacitor motor. 35. Which motor is generally used for electric shavers ? (D) Universal motor.

What is hysteresis motor?

Hysteresis motor is defined as a synchronous motor that is having cylindrical rotor and works on hysteresis losses induced in the rotor of hardened steel with high retentivity. It is a single phase motor and its rotor is made of ferromagnetic material with non magnetic support over the shaft.

What is the difference between reluctance motor and induction motor?

Induction motors develop torque because of a slip between the speed of the rotor and the speed of the magnetic flux rotating around the stator winding. … In the switched-reluctance design, however, the magnetic field in the rotor is time varying.