Motherboard Design Guide
Requirements for Components of Third-party Suppliers
maxon motor control
EPOS4 Positioning Controller
Document ID: rel5977
4-75
EPOS4 Module/Compact 50/8 Hardware Reference
Edition: February 2016
© 2016 maxon motor. Subject to change without prior notice.
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 electro-
magnetic interference.
An additional choke must feature electromagnetic shielding, an adequate saturation current, minimal
losses, and a nominal current greater than the continuous current of the motor. The below wiring exam-
ple refers to an additional inductance of 2.2
μ
H or 22
μ
H. If a different additional inductance is required,
also the filter components must be adapted accordingly. Should you need further help with the filter
design, contact maxon Support at
http://support.maxonmotor.com.
Example 1
Example 2
Figure 4-52
Wiring of motor winding 1 (analogously valid also for motor windings 2 & 3)
Additional external inductance per phase
Operating vV
CC
Switching frequency of the power stage = 50’000 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
H
[ ]
V
CC
V
[ ]
f
PWM
Hz
[
]
I
N
A
[ ]
L
Motor
H
[ ]
