Technical data

Manual – Gear Units and Gearmotors
93
7
Thermal characteristics (→ GM, → MM)
Project Planning for AC Motors
7.5 Thermal characteristics (→ GM, → MM)
Thermal classes
according to IEC
60034-1 (EN
60034-1)
AC motors, AC brake motors and MOVIMOT
®
drives are available in the following
thermal classes:
• The standard design for all single-speed AC motors/AC brake motors and Dahlander
motors is thermal class B. Thermal classes F or H are available on request.
• The standard design for all multi-speed AC motors/AC brake motors with separate
winding is thermal class F. Thermal class H is available on request.
• Standard design for all MOVIMOT
®
drives is thermal class F. Other thermal classes
are not possible for MOVIMOT
®
drives.
The table below lists the overtemperatures to IEC 60034-1 (EN 60034-1).
Power reduction The rated power P
N
of a motor depends on the ambient temperature and the altitude.
The rated power stated on the nameplate applies to an ambient temperature of 40 °C
(104 °F) and a maximum altitude of 1,000 m (3300 ft) above sea level. The rated power
must be reduced according to the following formula in the case of higher ambient tem-
peratures or altitudes:
AC motors For AC motors, the factors f
T
and f
H
are listed in the following diagram:
GM
MM
Thermal class
Overtemperature limit [K]
Old New
B 130 °C 80 K
F 155 °C 105 K
H 180 °C 125 K
P
Nred
= P
N
• f
T
• f
H
00627BUS
Figure 39: Power reduction dependent on ambient temperature and altitude
ϑ = Ambient temperature
H = Altitude above sea level
86 104 122 140 ϑ [˚F]
3300 6600 9900 13200 H [ft]
f
T
f
H
0.7
0.8
0.9
1.0
0.7
0.8
0.9
1.0