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    14.素養(4)
A 500Hz
B 1000Hz
C 1500Hz
D 250Hz

f = 1T

f = 10.004 =250 Hz


A 4極
B 6極
C 8極
D 12極

f = PN120

N = 30 × 60 =1800 rpm

60 = P×1800120

P = 4


A 50%
B 33%
C 20%
D 16%

T = 1f = 11000 = 1ms

工作週期= 200μ1m × 100% = 200×10–61×10–3 × 100% = 20%