Motor construction
• Rotor
• Stator
• Air gap
• Windings
Parts of DC Motor
Series Motor
Advantages of DC series
motors:
• Huge starting torque
• Simple Construction
• Designing is easy
• Maintenanc...
Permanent Magnet DC Motor
• Higher efficiency since no electrical energy is used or losses
incurred for developing or main...
Advantages
simple torque and speed control without
sophisticated electronics
General Torque Equation
Translational (linear) motion:
dt
d
JT


Rotational motion:
dt
dv
MF 
F : Force (Nm)
M : Mass (...
Synchronous Machines
• Above a certain size, synchronous motors are
not self-starting motors. This property is due
to the inertia of the rotor;...
• synchronous motor produces no inherent
average torque at standstill, it cannot
accelerate to synchronous speed without
s...
Applications
• Synchronous motors are especially useful in applications
requiring precise speed and/or position control.
•...
Induction Motor
• Asynchronous motor
• AC electric motor
Introduction
• Three-phase induction motors are the most
common and frequently encountered
machines in industry
Induction Motor
• The electric current in the rotor needed to
produce torque is induced by electromagnetic
induction from ...
– simple design, rugged, low-price, easy maintenance
– wide range of power ratings: fractional horsepower to
10 MW
– run e...
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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Introduction to motors

  1. 1. Motor construction • Rotor • Stator • Air gap • Windings
  2. 2. Parts of DC Motor
  3. 3. Series Motor Advantages of DC series motors: • Huge starting torque • Simple Construction • Designing is easy • Maintenance is easy • Cost effective
  4. 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. 5. Advantages simple torque and speed control without sophisticated electronics
  6. 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. 7. Synchronous Machines
  8. 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. 9. • synchronous motor produces no inherent average torque at standstill, it cannot accelerate to synchronous speed without some supplemental mechanism.
  10. 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. 11. Induction Motor • Asynchronous motor • AC electric motor
  12. 12. Introduction • Three-phase induction motors are the most common and frequently encountered machines in industry
  13. 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. 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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