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Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
Introduction to motors
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Introduction to motors

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Transcript

  • 1. Motor construction • Rotor • Stator • Air gap • Windings
  • 2. Parts of DC Motor
  • 3. Series Motor Advantages of DC series motors: • Huge starting torque • Simple Construction • Designing is easy • Maintenance is easy • Cost effective
  • 4. Permanent Magnet DC Motor • Higher efficiency since no electrical energy is used or losses incurred for developing or maintaining the motor’s magnetic field. • Higher torque and power density. • Linear torque speed charcteristics. that are more predictable. • Better dynamic performance due to higher magnetic flux density in air gap. • Simplified construction and essentially maintenance-free. • More compact size. http://www.ohioelectricmotors.com/permanent-magnet-dc-motors-649#ixzz2sttph8bA
  • 5. Advantages simple torque and speed control without sophisticated electronics
  • 6. General Torque Equation Translational (linear) motion: dt d JT   Rotational motion: dt dv MF  F : Force (Nm) M : Mass (Kg ) v : velocity (m/s) T : Torque (Nm) J : Moment of Inertia (Kgm2 )  : angular velocity ( rad/s )
  • 7. Synchronous Machines
  • 8. • Above a certain size, synchronous motors are not self-starting motors. This property is due to the inertia of the rotor; it cannot instantly follow the rotation of the magnetic field of the stator.
  • 9. • synchronous motor produces no inherent average torque at standstill, it cannot accelerate to synchronous speed without some supplemental mechanism.
  • 10. Applications • Synchronous motors are especially useful in applications requiring precise speed and/or position control. • Speed is independent of the load over the operating range of the motor. • Speed and position may be accurately controlled using open loop controls, e.g. stepper motors. • Low-power applications include positioning machines, where high precision is required, and robot actuators. • They will hold their position when a DC current is applied to both the stator and the rotor windings. • Increased efficiency in low-speed applications (e.g. ball mills).
  • 11. Induction Motor • Asynchronous motor • AC electric motor
  • 12. Introduction • Three-phase induction motors are the most common and frequently encountered machines in industry
  • 13. Induction Motor • The electric current in the rotor needed to produce torque is induced by electromagnetic induction from the magnetic field of the stator winding. • Does not require mechanical commutation
  • 14. – simple design, rugged, low-price, easy maintenance – wide range of power ratings: fractional horsepower to 10 MW – run essentially as constant speed from no-load to full load – Its speed depends on the frequency of the power source • not easy to have variable speed control • requires a variable-frequency power-electronic drive for optimal speed control

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