Please enable JavaScript.
Coggle requires JavaScript to display documents.
Motors - Coggle Diagram
Motors
Operating Principles
DC motors
- Using commutators or electronic seitching to sustain the rotation
AC motors
- relying on rotating magnetic fields (synchronous locking or induction with slip)
-
Type of Motors
AC Motors
Synchronous
- Runs at synchronous speed (Ns = 120f/P).
- Requires an Extra DC source to energize its rotor winding
- No slipd ( Speed of motor (N) =Ns
- The device that operates on the principle of magnetic interlocking between the rotor and stator field
Rotor Type
- Permanent Magnet: As the rotating magnetic field rotate, it pull the magnet along causing it to rotate
Asynchronous (Induction)
- runs on speed less than the
synchronous speed
- Does not require any extra source
- Has Slip ( Speed of Motor (N) < Ns, N -Ns (1-S) )
- The device that operates on the principle of electromagnetic induction between the stator and rotor
Rotor Type
- Squirrel Cage: Harnesses electromagnetism from stator to create motion.
- Wound: Control torque and speed by using external resistor to improve its performance
DC Motors
Brushed DC
- Operate on Direct Current (DC)
- High torque at low speed
- Rotational speed can easily be controlled by varying the supply voltage (direct)
Brushless DC (BLDC)
- No commutators and brush
- Moderate torque at high speed
- No controller
Components
Brushed DC motor
- Commutator: Reverses current in the rotor
- Armature: Electromagnet coil
- Stator: Permanent magnet or electromagnet
- Brush: Maintains contact with commutator for current flow
- Shaft: Transfers Mechanical Power
Brushless DC Motor
- Rotor: Permanent Magnet
- Stator: Electromagnet coil winding
Inner Rotor Motor
- Heat dissipation: Coil winding positioned outside for easy heat dissipation.
- Design: Produces high torque.
Outer Rotor Motor
- Heat dissipation: Heat trapped within the permanent magnet.
- Design: Operates at lower current and low cogging torque.
Comparisons
AC vs. DC
- AC: Better for high-power and fixed speed
- DC: Speed control and higher maintenance (brushed)
Brushless DC vs Brushed DC
- Brushless DC: Longer life and complex control
- Brushed DC: Cheaper and simpler
-