1.6
Design of the motors
Synchronous servomotors in the AKM series are brushless DC motors for demanding servo appli-
cations. When combined with our digital servo amplifiers 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 dyna-
mic fashion. A three-phase winding which is driven by the servo amplifier is integrated into the sta-
tor. The motor does not have any brushes since commutation is performed electronically by the
servo amplifier
The temperature of the winding is monitored by temperature sensors in the stator windings and is
signalled via an electrically isolated thermistor (PTC,
£
550
W
/
³
1330
W
).
A
resolver
is built into the motors as standard feedback element. The servo amplifiers in the
SERVOSTAR series evaluate the resolver position and supply sinusoidal currents to the motors.
The alternatively offered feedback systems partly cause a change of the motor length and cannot
be retrofitted.
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).
1.7
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
95% rel. humidity, no condensation
(at rated values)
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
Ball-bearing life
³
20.000 operating hours
Technical data
Þ
Storage data
Þ
8
Servomotors AKM
General
05/2006
Kollmorgen
