# Which synchronous motor will be smallest in size?

Contents

Which synchronous motor will be smallest in size ? (D) 10 HP, 375 rpm. Explanation: Q15.

## What is floating synchronous motor?

A synchronous motor is said to be ‘floating’ when it operates on no load and without loss. When a synchronous machine operates at no load, armature current will be zero; Therefore MMF due to armature current is zero.

## Which of the following losses in a synchronous motor does not vary with load?

Friction and windage losses do not depend upon the load condition of the machine; They are the function of the speed only, thus for the most synchronous machine they are constant.

## What are the two types of synchronous motor?

There are two major types of synchronous motors depending on how the rotor is magnetized: non-excited and direct-current excited.

• Non-excited motors.
• DC-excited motors.
• Examples.
• Use as synchronous condenser.
• Other.

## When a synchronous motor is on no load the torque angle is?

At full-load, the rotor poles of a synchronous motor are displaced by a mechanical angle of 1° from their no load position.

## Which motor is used in compressor?

The most common electric motor is a three-phase squirrel cage induction motor. This type of motor is used in all types of industries. It is silent and reliable, and is therefore a part of most systems, including compressors.

## What is the V curve of synchronous motor show relationship between?

Detailed Solution. Synchronous motor: V curves for synchronous motor give the relation between armature current and DC field current.

## Which of the following loss in synchronous machine is higher?

Iron losses have a high proportion of losses occurring in the synchronous machine.

## What are the losses occur in synchronous motor?

In the synchronous motor, there are two types of mechanical losses viz. friction losses and windage losses. The friction losses occur due to the friction in the moving parts such as bearings etc.

## What is the speed of synchronous motor?

The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is the speed at which the electromotive force is produced by the alternating machine.

Synchronous Speed.

Number of Poles Synchronous Speed NS in r.p.m
10 600
12 500

## What are the types of 3 phase synchronous motor?

This type of synchronous motor is divided into three categories and is available in three designs, each of which has unique features:

• Hysteresis Synchronous Motors.
• Reluctance Synchronous Motors.
• Permanent Magnet Synchronous Motors.
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## What is synchronous motor?

A synchronous motor is one in which the rotor normally rotates at the same speed as the revolving field in the machine. The stator is similar to that of an induction machine consisting of a cylindrical iron frame with windings, usually three-phase, located in slots around the inner periphery.

## Which type of motor is used in synchronous motor?

Principle of Operation Synchronous Motor

Synchronous motors are a doubly excited machine, i.e., two electrical inputs are provided to it. Its stator winding which consists of a We provide three-phase supply to three-phase stator winding, and DC to the rotor winding.

## What is the starting torque of synchronous motor?

A synchronous motor has no starting torque but when started it always runs at a fixed speed. 2. A single-phase reluctance motor is not self-starting even if path for eddy currents are provided in the rotor.

## Why a synchronous motor is named so?

Definition: The motor which runs at synchronous speed is known as the synchronous motor. The synchronous speed is the constant speed at which the motor generates the electromotive force. The synchronous motor is used for converting the electrical energy into mechanical energy.

## What is torque angle in synchronous motor?

Torque angle δ is the angle between Rotor flux and Stator fluxes, both are rotating at synchronous speed. When the synchronous machine is connected to an infinite bus, its speed and terminal voltage are fixed and unalterable.