LINEAR MOTOR principle , contraction, working type
- 2. Linear Motors can be considered as a conventional rotary motor which produce motion in a straight line. WHAT IS LINEAR MOTOR?
- 3. • How does it work? I. Take a squirrel cage induction motor II. Cut it down and open it out III. Smooth the rotor bars into conductor sheet IV. Apply AC power and you have Linear Induction Motor CONSTRUCTION
- 5. CONSTRUCTION
- 6. • The stator produce magnetic poles through electromagnetic process • The stator poles always changes due to AC supply • The magnetizing of stator is controlled via external electronic circuit (Liner Motor Driver) • The rotor used superconducting magnets which are cooled to low temperatures to reduce power consumption • The interaction of magnetic poles (attract/repel) caused the rotor to move in a straight line WORKING PRINCIPLE
- 7. Advantages Disadvantages Movement can be controlled Not suitable for use in a vertical axis. Energy losses due to friction or vibration is eliminated Limited power and force densities Fast respond and high acceleration Lower efficiency Much quieter than ordinary motor High cost ADVANTAGES & DISADVANTAGES
- 8. • SMALL LINEAR MOTORS • Conveyor system. • Airport baggage handling. • Pumping of Liquid Metal. • Accelerators and Launchers. LARGER LINEAR MOTOR • Transportation ( Low & Medium Speed Trains) • Automatics sliding doors in electric trains. • Material handling equipment such as propulsion of a train of tubs along as certain route. APPLICATIONS
- 9. • LIM can be considered as conventional rotatory motor with both the stator and the rotor split and rolled out flat to produce motion in a straight line • It produce high respond with high acceleration motor • The air-gap needs to be as small as possible to have a better thrust and efficiency • The speed of linear motor can be determine by the frequency of alternating current and the magnetic field directions • The cost is high due to complicated construction and control circuitry CONCLUSION