User manual
Drive unit DAE-01 CL
12
5.5.2 Drive dynamics
The drive unit is equipped with a very powerful motor, which easily accele-
rates or decelerates even a 60 kg-platter to its nominal speed.
The power transmission between the drive unit and platter is of particular
importance in this context.
By changing the drive dynamics of the drive unit (acceleration and dece-
leration behavior), specific properties of the components involved in the
power transmission can be taken into account:
• Drive Belt
Design, elasticity, surface and friction coefficients (material used)
• Platter
Weight, surface and friction coefficients (material used)
• Pulley
Diameter, surface and friction coefficients (material used)
Thus a heavy platter can be accelerated or decelerated comparatively
gently, whereas a light platter can be accelerated or decelerated very fast
to nominal speed.
The values for „Brake“ and „Acceleration“ are parameters for linear func-
tions, while „Gain“ is a first-order nonlinear function. Linear and nonlinear
functions together form the drive characteristic.
Channel
Function
Variable
Range of
values
110
Gain
yes
1 - 200
111
Acceleration
yes
10 - 999
112
Brake
yes
10 - 999
We differentiate between „Brake“ and „Acceleration“, although the com-
ponents involved will behave the same in both situations.
This, however, allows the user, for instance for aesthetic reasons, to acce-
lerate the platter differently from deceleration.
5.5.3 Gain
„Gain“ describes the non-linear behaviour of 1st order during acceleration
or deceleration. The set value describes the gradient of the drive characte-
ristic curve with which the nominal speed is achieved.
Channel
Function
Variable
Range of
values
110
Gain
yes
1 - 200
The higher this value is set, the „steeper“ the drive characteristic curve is
and the faster the nominal speed is achieved.
In the above diagram examples of „Acceleration“ are shown in blue and
„Brake“ in red.
5.5.4 Brake, Acceleration
The values for „Brake“ and „Acceleration“ describe the maximum accele-
ration and braking effect respectively.
The higher these values are adjusted, the stronger the acceleration.
Channel
Function
Variable
Range of
values
111
Acceleration
yes
10 - 999
112
Brake
yes
10 - 999
However, the set value for „Gain“ is decisive for the course of the drive
characteristic curve. The selected acceleration or braking values can only
limit the drive behaviour.
If, for example, the drive characteristic curve is to be steep but the
acceleration only low, „Gain“ is set to a high value, while „Brake“ and
„Acceleration“ are set to low values.
For the course of the drive characteristic curve, the „Brake“ or „Accel-
eration“ curves are compared with the „gain“ curve.
At each time point of the acceleration process, the respective lower value
is evaluated to control the motor.
In the above example, the drive dynamics during the first 3 s is determined
by the linear course of „Acceleration“. After that, „Gain“ provides smaller
values and therefore is taken as the result.
The same applies analogously to the braking process shown in red.
