Faulhaber Series BLD 3502 Operating Instructions Manual - Notice of Use
11
Specifications subject to change without notice
Notice of use
8.
Notice of use
8.1
Power supply
Any unstabilized DC power supply voltage within the servo amplifier range
(12 V
≤ Vm ≤ 35 V) may be used, although it is advisable to keep this voltage
as low as possible in order to minimize the EMI noise.
Thus the optimum power supply is given by the following relation:
with: R, k
E
= Terminal resistance (phase to phase) and Back-EMF
constant of the motor.
I
max
, n
max
= Maximum current and speed reached by the motor in your
specific application.
8.2
Wiring
A well known disadvantage of Pulse Width Modulation (PWM) is the large amount of
interferences generated. This has two consequences, namely perturbations to the
environment and self-perturbations.
The EMI is generated by the motor power leads and induced in the Hall sensor wires.
The smooth running of the motor is therefore perturbated and even in some cases, the
motor will not run at all.
In order to reduce the effect of these perturbations, the following basic rules must be
followed:
• Use wires as short as possible;
• Avoid to run signal wires (logic and analog commands, Hall sensor and encoder signals)
in close proximity to power lead wires (power supply and motor phases);
• Connect shielded wires to ground at one end only to avoid ground loops.
Special care should be given to the motor connection. The following table shows the
different solutions:
V
m
[V]
≈ 5 [V] + R [Ω] · I
max
[A] + k
E
[V/rpm] · n
max
[rpm]