Zapi EPS-AC0, User Manual, Page: 14 / 95

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4.4 Sensor in the steering handle
Two configurations are foreseen:
1) No limit, multiturn steering wheel.
2) Tiller, handlebar or joystick arrangement with a limited angle.
Depending by the above choice, there are two different handling:
1) In case of multiturn steering wheel, a stepper motor is used.
2) In case of a handlebar with limited angle, a twin pot is used.
4.4.1 Stepper motor
The stepper motor is used as a tachogenerator. The following part numbers resulted
suited to work with eps-ac0:
1) MINEBEA Type code AA23KM-K227-T20V.
2) JAPAN SERVO Type Code KH56JM2X 1269 DC12V 30 ohm.
They have the same mechanical dimensions (see Figure 4.2 below).
Obviously, the above information states only these parts are suited for the eps-ac0;
no reliability evaluation is given here.
Other sources are possible on request, but must be tested for approval.
Figure 4–2
4.4.2 Twin pot
The Twin pot is a double potentiometer in the same frame. The two potentiometers
inside must have complementary action (i.e. one wiper grows up from zero to Vcc
meanwhile the second wiper reduces from Vcc to zero - see Figure 4-3 below).