# LINEAR ELECTRIC MOTOR CONCEPT

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Jun 1 • Engineering Notes • 1253 Views • 5 Comments on LINEAR ELECTRIC MOTOR CONCEPT

LINEAR ELECTRIC MOTOR CONCEPT:

To know the concept of linear electric motor concept first of all we will have some idea about linear electric motor.

LINEAR  ELECTRIC MOTOR:

A linear electric motor is the device which converts electrical energy to mechanical energy. There are mainly three types of linear electric motor:

• Synchronous linear motor
• Induction linear motor
• Reluctance linear motor

The main aim of manufacturing of linear electric motor are as follow

• For analyzing and determining the characteristic of the variants versus long track application
• For defining the optimization criteria and design process
• For determining the best linear motor solution and its spatial integration in the lift available space

CONCEPT OF LINEAR ELECTRIC MOTOR:

The concept of linear electric motor is that it generates a moving magnetic field in the stator in which a magnetic object and rotor can travel. Genrally there are two types of design of linear electric motor depending upon the stator and moving part of the motor. Having a fixed coil design the field coil in it are static  and magnets moves with coil. The advantage of moving  magnet linear motor is that it can supply cables for the field coils and the measuring system is not needed to be moved. The concept of linear electric motor has proved to be very versatile. The principle objective of linear electric motor is to find a best suited motor for different application.

SYNCHRONUS MOTOR DRIVE:

The synchronus electric motor is an ac motor in which the rotation of the shaft is synchronized with the frequency of current and the rotation period is equal to number of ac cycles. Such types of motor contains electromagnet on the stator which create a magnetic field which helps in rotation with the oscillation of line current. These motor produces torque at synchronizing speed. Number of magnetic poles and the line frequency determines the speed of synchronus  motor.

OPERATION:

To understand the operation of synchronus motor it is important to understand that why the field of these motor rotates at synchronizing speed. Each of the set of stator pole is matched with equivalent set of field poles ,as we know that unlike pole attracts and like pole repel each other the poles in rotating field align themselves with opposite poles of the stator. When motor is loaded lightly,angular displacement of centerline increases. There are two factors which determines the synchronus speed of the motor:

• Frequency of the applied voltage
• Number of poles in the motor

Speed=freq×120/poles

Genrally synchronus motor are started by using different reduced voltage method and the most common one is starting across the line with full ac voltage to the armature winding. After attaining synchronus speed  the starting resistor is switched out of the field circuit. The main purpose of the dc excitation is to apply current to the field winding.

IMPORTANT QUESTION:

1-Define linear electric motor?

2-State different types of linear electric motors?

3-Write down the aims for manufacturing of linear electric motor?

4-Write down the concept  of linear electric motor?

5-What are the factors which determines the synchronus speed of motor?

6-Write down the operation of synchronus motors?

### 5 Responses to LINEAR ELECTRIC MOTOR CONCEPT

1. A very helpful article for the Electrical engineers…really the concept is explained briefly and it also explains about operastion techniques of the synchronous motor

2. patlakshi says:

Motor is an electronic device which converts the one form of energy to other form. This is one of the most important topic for the electrical engineers .

3. eletrical engineeers- the article is quite simple and help a lot in briefing on motors

4. A very detailed article on electric motor.This is one of the very important topic of engineering.Electric motor are of different types.This article explains all the types in detail.some related questions are also added in the post.Going through the post can be helpful..!!!!!