Hysterisis Motor

GROUP
 M.UMER KHAYYAM
 ADIL TAHIR
 HAMZA IFTIKHAR

CONTENTS
 Definition
 Construction of stator
 Construction of rotor
 Operation /Working
 Torque characteristics
 Mathematical analysis
 Applications
 Advantages and Disadvantages

HYSTERESIS MOTOR
 Definition:
A Hysteresis Motor is a synchronous motor with a uniform
air gap and without DC excitation. It operates both in
single and three phase supply. The Torque in a Hysteresis
Motor is produced due to hysteresis and eddy current
induced in the rotor by the action of the rotating flux of the
stator windings.

CONSTRUCTION
Construction of Stator:
The stator of the hysteresis motor produces a rotating magnetic field
and is almost similar to the stator of the induction motor. Thus, the
stator of the motor is connected either to single supply or to the three
phase supply.

Construction of Rotor:
The rotor of the hysteresis motor consists of the core of aluminium.
The figure below shows the rotor of the hysteresis motor. The rotor
of the motor is a smooth cylinder.

Operation of a Hysteresis Motor
When supply is given applied to the stator, a rotating magnetic field is
produced. This magnetic field magnetizes the rotor ring and induces
pole within it. Due to the hysteresis loss in the rotor, the induced rotor
flux lags behind the rotating stator flux. The angle δ between the stator
magnetic field BS and the rotor magnetic field BR is responsible for the
production of the torque.

MATHEMATICAL ANALYSIS
 The stator magnetic field produces Eddy currents in the
rotor. The eddy current loss is given by the equation shown
below.
 Where,
 ke is a constant
 f2 is the eddy current frequency
 B is the flux density

Continue:
Hysteresis power loss in the rotor of the hysteresis motor is given by
Where,
* fr is the frequency in the rotor (Hz)
*Bmax is the maximum value of flux density in the air gap (T)
*Ph is the heat-power loss due to hysteresis (W)
*kh is the hysteresis constant

ADVANTAGES
 As rotor has no teeth there are no mechanical
vibrations.
 Due to the absence of the vibrations the operation is
quiet and noiseless.
 Possibility of multispeed operation by employing gear
train

DISADVANTAGES/LIMITATIONS
 Costlier.
 Low efficiency.
 Available in very small sizes.

APPLICATIONS
 Air conditioners.
 Due to the noiseless operation it is used in sound
recording instruments , sound producing equipments
high quality record players.

REFERENCE
 Bertinov, A. I., and M. A. Ermilov. Gisterezisnye elektr
odvigateli. Moscow, 1967.
 Armenskii, E. V., and G. B. Falk. Elektricheskie mikro
mashiny. Moscow, 1968
 V. A. PROKUDIN

Hysterisis Motor

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Hysterisis Motor