tim said:
could any one explain the differences between wave and lap windings used to
form the armature many thanks
Wave and lap wound motors for DC motors differ in that a wave wound machine
will have 2 parallel current paths- the winding progresses from one
commutator bar, through several coil sides, around the armature until it
reaches the next commutator bar. In a lap machine, the number of paths = the
number of poles. Each coil is connected between adjacent commutator bars.
Except for two pole machines, for a given power, the lap wound machine will
be a lower voltage,higher current machine than the wave wound machine.
N S N S
|-------------| |-------------|
| | |
| Wave goes around machine
/ |____________| \
Next part of winding from bar2 to bar 3
bar1
Bar2
N S N
S
|-------------| |--------------|
| | |
| Lap -next coil from bar 2 to bar 3, etc
\ / \
/
Bar 1 Bar 2 Bar n Bar
n+1
You indicate a/c in the header- do you mean AC? Universal motors are
essentially DC series motors which will run on AC. Most
AC motors are
induction or synchronous machines where the "armature" is stationary and a
commutator is not used so "wave" or "lap" really lose their meaning. An AC
winding will have a group of coils which are connected in series and may
have several such groups in parallel. The coils are distributed to get an
(stepwise) approximate sinusoidal distribution to eliminate or reduce
harmonics.
