
Motherboard Design Guide
Requirements for Components of Third-party Suppliers
ESCON Module 50/8 Hardware Reference
5-38
CCMC | 2021-08 | rel10243
TVS DIODE (D1)
To protect against overvoltage resulting from voltage transients or brake energy feedback, we recommend
connecting a TVS (transient voltage suppressor) diode (D1) to the voltage supply cable.
CAPACITOR (C1)
The function of the ESCON Module 50/8 does not necessarily require the use of an external capacitor (C1).
To further reduce voltage ripple and feedback currents, an electrolytic capacitor can be connected to the
voltage supply cable.
5.1.3
Motor Cables/Motor Chokes
The ESCON Module 50/8 is not equipped with internal motor chokes.
The majority of motors and applications do not require additional chokes. However, in the case of high
supply voltage with very low terminal inductance, the ripple of the motor current can reach an unacceptably
high value. This causes the motor to heat up unnecessarily and causes instable control behavior. The
minimum terminal inductance required per phase can be calculated using the following formula:
If the result of the calculation is negative, no additional chokes are necessary. Nevertheless, the use of
chokes in combination with additional filter components can be useful to reduce the emission of electromag-
netic interference.
Additional external inductance per phase
Operating vV
CC
Switching frequency of the power stage = 53 600 Hz
Nominal current of the motor (
line 6 in the maxon catalog)
Terminal inductance of the motor (
line 11 in the maxon catalog)
L
phase
1
2
---
V
cc
6
f
PWM
I
N
⋅
⋅
-----------------------------
0.3
L
motor
⋅
(
)
–
⋅
≥
L
phase
H
[ ]
V
cc
V
[ ]
f
PWM
Hz
[
]
I
N
A
[ ]
L
motor
H
[ ]