BECKHOFF AM2000 - Manual (Page 8)

I.3 Design of the motors
Synchronous servomotors in the AM227..297 series are brushless DC motors for
demanding servo applications. When combined with our digital servoamplifiers they are
especially suited for positioning tasks in industrial robots, machine tools, transfer lines
etc. With high requirements for dynamics and stability.
The servomotors have permanent magnets in the rotor. The rare earth neodymium
-iron-boron magnetic material is an important factor in making it possible to drive these
motors in a highly dynamic fashion. A three-phase winding which is driven by the
servoamplifier is integrated into the stator. The motor does not have any brushes since
commutation is performed electronically by the servoamplifier.
The temperature of the winding is monitored by temperature sensors in the stator wind-
ings and is signalled via an electrically isolated contact (normally closed).
A resolver is built into the motors as standard feedback element. The servoamplifiers in
the AX2000 series evaluate the resolver (hence rotor) position and supply sinusoidal cur-
rents to the motors.
The motors can be delivered with or without a built-in holding brake. Retrofitting of the
brake is not possible.
The motors are enamelled in matt black (RAL 9005). This finish is not resistant against
solvents (e.g. trichlorethylene, nitro-thinners, or similar).
I.4 General technical data
Climate category 3K3 to EN 50178
Ambient temperature 5...+40°C for site altitude up to 1000m amsl
(at rated values) It is vital to consult our applications department
for ambient temperatures above 40°C and
encapsulated mounting of the motors.
Permissible humidity (at rated values) 85% rel. humidity, no condensation
Power derating
1% / K in range 40°C...50°C up to 1000m amsl
(currents and torques) for site altitude above 1000m amsl and 40°C
6%
up to 2000m amsl
17% up to 3000m amsl
30% up to 4000m amsl
55% up to 5000m amsl
No derating for site altitudes above 1000m amsl
with temperature reduction of 10K / 1000m
Max. permissible flange temperature 65°C at rated values
Ball-bearing life
³ 20.000 operating hours
Technical data ÞI.8
Storage data ÞIV.1
8 Motor series AM227..297
General
12/2001
BECKHOFF