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t i o n o f T h r e e n h a s e I n d u c t i o n M o
- Æ t h e eT he o bje c t iv e o f t h is e x p e r i m e n t i s t o :
D e m o n s t r a t e a n d e x p l a in th e o pe r a t io n o f 3q ha s e in d u c t io n m o t o r s
D r a w t he c h- te r i s t ic c u r v e s o f 3q ha s e in d u c t io n m o t o r s
D r a w t he c ha r a c te r is t ic c u r v e s o f 3 pha s e in d u c t i o n m o t o r s w he n o n e p ha s e i s
o pe n e d
- t s a n d c F i xe d (220 v) dc su p p l y
* V a r ia b le (0 3 80 v ) a c s u p p ly
- p h a s e i nd u c t i on mo t or
E l ect nomagnet i c dy na mo m e t er .
* A m m e t e r s a n d v o lt m e t e r s
* Sw i t c h s
3 C o n - -
4 0 a c A
0 3 8 0
v a r i a b l e
a c S u pp l y
h ha s e
5 0 in d1 t t io 1 - e t =
四6 0 -
- 8
220 1 ; DC
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4 n d - r i m e n t
1) C o n n m t t he c i r c u i t a s s ho w n,
c lo s e s w i t c h S
O n th e Po w e r Su pp ly , m a k e s u r e t he m a in po w e r s w i t c h is s e t t o t he 0 (o f ï)
p o s i t io n,
a n d t he v o l ta ge c o n t r o l kn o b is t ur ned f u l ly c o u n te r c lo c k w i s e E n s u r e
th e Po w e r Su pp l y is c o n n e c t e d
Se t t he lo a d t o r clu e t o z e r o,
t u m o n the p o w e r s u pp ly a n d s e t t he v o l ta ge c o n t r o lkn o b s o t ha t t he l in e v o l t a ge e q u a l t o t he n o m i n a l l in e v o lt a ge o f t he in d u c t io n
m o t o r
W h a t i s t he d i r e c t i o n o f r o t a t i o n o f t he i n du c t io n m o t o r ?
R e c o r d i n the fo l lo w in g b la n k s pa c e t he m o t o r s pe e d n - r p m
I s t h e n o l o a d s pe e d a l m o s t e q u a l t o t he s pe e d o f the r o t a t in g m a g n e t i c f ie ld(s y n c h r o n o u s s pe e d )?
4 ) I n c r e a s e t he dy n a m o m e t e r lo a d to r cl u e gr a d u a l ly a n d ñ l l i n the fo l lo w in g t a b le
N o t e T h e n o m in a l Bin e c u r r e n t o f the Bn d u c t io n M o to r m y b e e x c e e d e d w h ile p e r fo r m in gth is m a n ip u la t io n It is
, t her ef or e
, s u gg e s te d to c o m p le te t he m a n ip u la t io n w ith in a t im e
in t e r v a l o f 5 m in u te s o r le s s
5) D r a w t he fo l lo w in s c u r v e s
* TOr quspeed c u r v e
A r ma t ur e cu r r en t - u t pu t pow e r cu r ve .
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6 ) D i r e c t i o n o f R o t a t io n
O n t he I n d u c t io n M o t o r,
in t e r c ha n ge a n y t w o o f t he th r æ le a d s c o n n e c t e d t o t h e
s t a t o r w in d i n gs
T u m o n t he Po w e r Su pp ly a n d s e t t he v o lt a ge c o n t r o l k n o b s o t ha t t he l in e v o l t a ge i s
e q u a l to t he n o m in a l l in e v o l t a ge o f the in d u c t io n m o t o r W n a t is th e d i r e c t io n o f
r o t a t io n o f t he m o t o r ?
D o e s t he in du c t io n m o t o r r o t a t e o ppo s i te to the d i r e c t io n n o t e d p r e v io u s ly in t h i s
e x e t c i s e ?
7 ) O pe n s w i t c h s w he n th e m o t o r i s - i n g a t n o lo a d
8) R e p e a t s te p s 3,
4,
5 w i th s w i t c h s o p e n
T o r q u e M o t o r s p e e d A r m a t u r e c u r r e n t O u t p u t p o w e r
N m Rp m m A m T W a t t
3
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13 5 û Æ a ; . N 1
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