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Many designs have been put forward for linear motors, falling into two major categories, low-acceleration and high-acceleration linear motors. In a linear motor. The rotor with permanent magnets becomes the stationary part of the linear motor (also called the secondary, or magnet plate), and the stator, which contains the coil windings, becomes the moving part (also called the primary, or coil unit). to direct and improve the magnetic flux interaction between the primary and secondary components ,Magnetic Tracks will be sued .
Different linear motors can be constructed for wide applications , these liner motors are :
– Low Acceleration Linear Motors
– High Acceleration Linear Motors
– Synchronous linear motors
– Induction linear motors
– Homopolar linear motors
– Tubular linear motors.
– Piezoelectric linear motors

In PMDC motors, the armature rotates due to a mechanical force induced by the magnetic field when current flows through its windings, according to Fleming’s left-hand rule.
The PMDC motor features a simple design with a stator that houses permanent magnets and an armature with windings and a commutator.
PMDC motors are efficient and cost-effective as they require no external power for field excitation and have fewer parts, making them compact.
These motors are ideal for low-power applications where complex speed controls are unnecessary, such as in toys ,commonly used as a starter motor in automobiles, windshield wipers, washers, blowers used in heaters and air conditioners ,computer disc drives and in many more.

The armature winding is powered by DC voltage V via a commutator and brushes, which causes the flow of current I. As a result of the magnetic field and the current, a force is acting on the armature, which starts rotating. The purpose of the commutator is to ensure the current flow through the relevant parts of the armature windings, so that the force acting on the armature is maximum.

Separately Excited Dc Motors have a broad range of output voltage and can function in stable conditions with any field excitation.

Characteristics of Series Wound DC Motors are high starting torque , simple in construction , cost effective and high power density .
Applications of Series Wound DC Model Motors:

• Electric Vehicles: Electric scooters, golf carts, and light rail vehicles due to their high starting torque.
• Construction Equipment: Due to their ability to handle, Cranes, hoists, and winches utilizes series wound motors.
• Trains: Series wound motors make them a common choice for powering model train locomotives due to their cost effective and simplicity.
• Power Tools: Grinders or uses series DC motor which provides high starting torque.
• Elevators: Series wound DC motor also plays a role in elevators.

Synchronous motors are used in many different applications because of their special qualities and accurate control. The following are a few typical uses for synchronous motors:

• Electric generators often utilize synchronous motors in power plants to convert mechanical energy into electrical energy.
• Synchronous motors are used in many industrial machinery because of their efficiency and capacity to operate at constant speeds.
• Synchronous motors are often utilized to power pumps in chemical processing facilities, where the production procedure requires a constant speed.
• As synchronous motors operate at a constant speed; they are a reliable and efficient choice for large-scale air conditioning systems.
• Synchronous motors are used in communication networks to synchronize timing mechanisms, among other uses for them.

Most of the universal motors are meant to operate at speeds as high as 3500 RPM. These motors run at a higher speed on DC supply than they run on AC supply of the same voltage.

Following are the distinctive properties of the universal motor:

• They run at high speed.
• They have high starting torque.
• Compact size and are lightweight.
• They are noisy because of the commutator and brushes.