44 ELECTRICAL APPARATUS

The speed in this case is:

ci n /i "\ J

A>Q == VJ- — So)

n

(7)

31. If:

a = 1,

that is, two equal motors, as for instance two four-polar motors
n = nr = 4,

So = 0.5,

it is:

while at full synchronism:

2n 8

n 4

If:

it is:

a = 2,
n = 4,
n' = 8,

that is, corresponding to »a twelve-polar motor.
While:

8 =/=/,

a = 0.5,

n = 8,
ri = 4,

it is:

1.5n ^ 12