phytron TM StepDrive 1x24..48V/5A, Руководство пользователя

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phytron
31 MA 1303-A007 EN
Motor time constant

R
L
=

applies to the motor´s electrical time constant

The total inductance L
total
is equal to the winding inductance in a parallel circuit, be-
cause of shared inductances.
L
total
= 4 x L applies to a series circuit.
The result is an equal motor time constant

for a serial and a parallel circuit:
Circuit series parallel
Resistance R
total
2 x R
2
R
Inductance L
total
4 x L L
Motor time constant

R
L x 2
R x 2
L x 4
series
  
R
L x 2
R/2
L
=
parallel
 
The values for L and R can be found in the technical data sheet of the connected stepper
motor.
Operation with very low-inductance motor
i
Due to the design of the power stage, operation of the TM StepDrive technology
module with a very low-inductance motor (<2 mH) may not be possible.
In this case, the use of external series inductors can provide a remedy. The inductors
must be suitable for the planned current and for frequencies of several 100 kHz.