17.
14
Notice of Use
Special considerations
17.1 Signal command
The signal command is given by an external voltage of ± 5 Volts or by a potentiometer
connected directly to the servo amplifier. The total potentiometer resistance must be between
10 k
Ω
and 47 k
Ω
. Before connecting it is recommended to read this chapter to obtain a good
operation of the brushless DC-Servomotor.
17.2 Power supply
Any unstabilized DC power supply voltage within the servo amplifier range (14V
≤
Vm
≤
56V)
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.
17.3 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 in 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, there are some basic rules to follow:
• Use wires as short as possible;
• Avoid to run signal wires (logical and analog commands, Hall sensor and encoder signals)
in close proximity to power lead wires (power supply and servomotor phases);
• Connect shielded wires to ground at one end only to avoid ground loops.
Specifications subject to change without notice
V
m
[V]
≈
5 [V] + R [
Ω
] · I
max
[A] + k
E
[V/rpm] · n
max
[rpm]
Summary of Contents for BLD 5606 Series
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