Technical data

Manual – Gear Units and Gearmotors
97
7
Starting frequency (→ GM, → MM)
Project Planning for AC Motors
Example Motor: DT80N4/BMG (→ Sec. "Technical data of AC motors")
No-load starting frequency Z
0
= 14000 1/h
1. (J
X
+ J
Z
) / J
M
= 3.5 → K
J
= 0.2
2. T
L
/ T
H
= 0.6 → K
M
= 0.4
3. P
stat
/ P
N
= 0.6 and 60% cdf → K
P
= 0.65
Z = Z
0
• K
J
• K
M
• K
P
= 14000 c/h • 0.2 • 0.4 • 0.65 = 728 c/h
The cycle duration is 5 s, the operating time 3 s.
Permitted work
done by the brake
If you are using a brake motor, you have to check whether the brake is approved for use
with the required starting frequency Z. Refer to the information in Sec. "Permitted work
done by the brake" on page 105.