Shaft End, A-Side; Protective Device; Vibration Class; Holding Brake - Kollmorgen AKM Serie Manual Del Producto

Technical Description
16.2.6

Shaft end, A-side

Power transmission is made through the cylindrical shaft end A, fit k6 (AKM1: h7) to DIN 748, with a
locking thread but without a fitted-keyway.
Bearing life is calculated with 20.000 operating hours.
Radial force
If the motors drive via pinions or toothed belts, then high radial forces will occur. The permissible
values at the end of the shaft may be read from the diagrams in chapter "Drawings" from p.87. The
maximum values at rated speed you will find at the technical data. Power take-off from the middle of
the free end of the shaft allows a 10% increase in F
Axial force
When assembling pinions or wheels to the axis and use of e.g. angular gearheads axial forces
arise. The maximum values at rated speed you will find at the technical data.
Coupling
Double-coned collets have proved to be ideal zero-backlash coupling devices, combined, if requi-
red, with metal bellows couplings.
16.2.7

Protective device

The standard version of each motor is fitted with an electrically isolated PTC (rated temperature
155°C ± 5%). The PTC does not provide any protection against short, heavy overloading. Provided
that our preassembled resolver cable is used, the PTC is integrated into the monitoring system of
the digital servo amplifiers.
16.2.8

Vibration class

The motors are made to vibration class A according to EN 60034-14. For a speed range of
600-3600 rpm and a shaft centre between 56-132mm, this means that the actual value of the per-
mitted vibration severity is 1.6mm/s.
Velocity [rpm]
<= 1800
> 1800
16.2.9

Holding brake

The AKM2-AKM8 motors are optionally available with a holding brake.
A spring applied brake (24V DC) is integrated into the motors. When this brake is de-energized it
blocks the rotor.
Personal safety in case of hanging loads (vertical axes) can be ensured only by using an ad-
ditional, external, mechanical brake.
If the brake is released then the rotor can be moved without a remanent torque.
The holding brakes are designed as standstill brakes and are not suited for repeated opera-
tional braking. In the case of frequent, operational braking, premature wear and failure of the
holding brake is to be expected.
The motor length increases when a holding brake is mounted.
The holding brake can be controlled directly by the servo amplifier (no personal safety !), the win-
ding is suppressed in the servo amplifier — additional circuitry is not required (see instructions
manual of the servo amplifier).
If the holding brake is not controlled directly by the servo amplifier, an additional wiring (e.g. varis-
tor) is required. Consult our support department.
English - 34
06/2010
.
R
max. rel. Vibration Displacement[µm]
90
65
Kollmorgen
max. Run-out [µm]
23
16
Servomotors AKM