System Components; Steering Motor; Gear Box And Total Reduction Ratio; Epsacw Controller - Zapi EPS-ACW User Manual

9 SYSTEM COMPONENTS

The integrated steering system needs the following components in order to work.
The following list describes the complete equipment.

9.1 Steering Motor

The integrated steering system includes a three phase AC induction motor
(Pn=400W @ 3000rpm) with a low resolution encoder (4pulses/rev) in the motor
shaft.

9.2 Gear Box and total reduction ratio

The steering motor is coupled to a planetary three stages IMS SP81 low noise
gear box with a 1:51 gears ratio. Standard arrangement typically uses a total
gears ratio in the range 1:200 to 1:300. So two external gears are expected to
increase the total gears ratio with a 1:4 or 1:5 factor.

9.3 EpsacW controller

It consists of a control unit working with Vbatt in the range 36 to 48V and a
maximum current limitation to 70Arms.
As the maximum torque @ Imax=70Arms is oversized for a standard application
(like a reach truck), it is possible to reduce the maximum current limitation to a
lower value (see parameter MAXIMUM CURRENT) preserving the motor from
overheating in case a fault (e.g. locking the gear box), turns the controller in its
maximum current limitation.
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Figure 9.3–1
AF9ZP0BA - EPS-ACW REACH TRUCK - User Manual