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Linear Motor Effects & Applications

1. Linear motors experience two effects not present in conventional induction motors: transverse edge effect and end effect. These effects increase motor losses. 2. The transverse edge effect occurs because current paths parallel to the direction of motion in the secondary do not contribute to useful thrust but only increase losses. 3. The end effect happens in linear motors with a short primary, as current paths beyond the field structure at the ends of the conducting plate do not create thrust and only increase losses.

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SK VISHNU
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130 views2 pages

Linear Motor Effects & Applications

1. Linear motors experience two effects not present in conventional induction motors: transverse edge effect and end effect. These effects increase motor losses. 2. The transverse edge effect occurs because current paths parallel to the direction of motion in the secondary do not contribute to useful thrust but only increase losses. 3. The end effect happens in linear motors with a short primary, as current paths beyond the field structure at the ends of the conducting plate do not create thrust and only increase losses.

Uploaded by

SK VISHNU
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Transverse edge effect and end effect

Linear motors are associated with 2 effects which are absent in conventional induction motor.
These effect will increase loss in motors

1. Transverse edge effect


Paths of induced current in secondary is not well defined because secondary of lincar

motor is a solid conducting plate


The portion of current paths parallel to direction of motion of secondary does not make

any contribution towards production of useful thrust but contribute towards losses
This effectreduces effective thrust and increases losses and is known as transverse edge
efect because current
paths parallel to the direction of motion are more towards
direction of conducting
plates

2 End cffect
In case of linear induction motor with
short primary the current path towards end of field
structure on the
conducting plate go beyond the field structure and such
Current path do not contribute portions of
to useful thrust but only towards
end effect motor losses.This is called
nd Qu mHutna
Advantages of LIM G magnhe Hus
L
paJ
Low initial cost Cuend
pok n deftit
Low maintenance cost(absence
Simplicity of rotating parts) mohon
No limitation on tractive effort due
No to adhesion
limitation on maximum between wheel and rail Seco
No
overheating of rotor as speed
the motor moves
TARn Srus edqr el
leaving the heated continuously over the cool
stationary part
Better power to portion behind.
weight ratio
Disadvantages
Poor utilization
of LIM
of motor due to transverse
Larger air gap and non edge effect and end effect
magnetic reaction rail(rotor
resulting in poor efficiency and low plate) need more
Very high capital
cost of
p.f. magnetizing current
reaction rail fixed
Complications and high cost along the centre line
Difficulty encountered in for providing 3 pahse collector of the track.
APPLICATIONS maintaining adequate clearances at system along the track.
A linear
points andcrossings.
induction motor is not that
widespread
aspects and versatility of compared a conventional motor,
taking its economic to
a few usage into consideration.
instances where the LIM is But there are
indeed quite
Few of such necessary for some
applications are listed below. specialized operations.
Automatic sliding doors in clectric trains.

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