5 Optional modules
Operating manual mzr-2521 and mzr-2921
24
Technical data subject to change without prior notice!
Last update: June 2019
5.5
Stepper motor drive (optional)
The micro annular gear pump mzr-2521 and mzr-2921 can alternatively be driven
by a stepper motor. This motor is characterized not only by small dimensions but
also by a large speed range, which perfectly covers the operating speed range of
the pumps.
Stepper motor
Operation
Current mode
Motor type
AM1524 A 0.25
Speed range
1 --- 3000 rpm
Phase resistance (at 20°C)
12.5 k
Ω
Inductance per phase (1 kHz)
5.5 mH
Nominal current per phase (2 current phases) 0.25 A
Back -EMF amplitude
3.5 V/k steps/s
Holding torque (2 current phases)
6 mNm
Step angle (full step)
15°
Max. allowed winding temperature
130 °C
Thermal time constant
220 s
Operating temperature range
-40 … + 70 °C
Weight
12 g
table 12
Technical data of the stepper motor
figure 18
Measurements of the micro annular gear pump mzr-2521 and mzr-2921 with the stepper motor
The stepper motor can be operated with an adapted control unit. For this
purpose the motor should be connected with a ribbon cable to the solder joint of
the control unit.
Pin 4 phase B
Pin 3 phase B
Pin 2 phase A
Pin 1 phase A
figure 19
PCB of the round stepper motor version