3rd generation power steering controller

With the Advanced Power Steering (APS) controller, meticulously engineered to fulfill the requirements set forth by the European standards for functional safety, Inmotion consolidates its market leadership for steer-by-wire systems.
The APS directly interfaces a variety of steering input devices and motor types. It can function and operate in a stand-alone steering system, or as a part of an overall CANopen based vehicle system. The product range covers a wide variety of vehicle applications including Class 1, 2, and 3 lift trucks.

While the APS is of course easily integrated with Inmotions own PSM steering actuator, it will function well with a wide variety of steering motors to ensure optimal fit into all vehicle types.

  • Best in class quality and reliability, achieved through superior design and outstanding manufacturing processes
  • Rugged design suitable for the demanding environment of electric vehicles. Protected against ingress of dust and water to IP65
  • Software quality by software development according to Automotive Spice ©
  • Software platform allows extensive functional customizations for optimal integration in target vehicle, without compromising safety supervision functionality
  • Powerful primary ARM processor and operating system allows parallel execution of customized vehicle control tasks and motor control tasks
  • Second ARM processor for redundant supervision according to ISO13849-1, category 3
  • Extensive and powerful event handling and data logging simplifies troubleshooting and minimizes vehicle down time
  • Supports AC induction, AC synchronous and brushless DC motors
  • Small physical size with flat heat sink for flexible integration
  • High side output with dual switches controlled by main and supervision functions for redundant execution of safety function
  • Integrated CAN bus with support for diagnostics and software download
  • Industry standard CANopen protocol for reliable communication in the vehicle
  • Dual redundant CAN nodes for distributed system architectures
Motor type Induction AC, synchronous AC, brushless DC
Communication CANopen 125, 250, 400, 500, 800 & 1000 kbps
Switching frequency 8 kHz (optional 12 & 16 kHz)
Operating stator frequency 0-250 Hz
Control mode Steering wheel/tiller steering modes (pos. speed or current motor control)
I/O Connector AMP SEAL 35-pin
Inputs 3 digital inputs pull-down, 1 digital input pull-up, 2 analog inputs,
1 high side input
Outputs 3 open drain outputs 2A, 1 open drain outputs 0.1A, 1 high side output
Supported motor feedback devices Dual incremental encoder, analog sin-cos, UWV (6-step)
Supported steering input devices Dual incremental encoder, analog sin-cos or PWM steering wheel sensors. Stepper motor.
Power Connector M5 screw
Operating temperature -40°C to + 55°C (-40°F to +131°F)
Storage temperature -40°C to +70°C (-40°F to +158°F), ambient humidity of 95%
Protection class IP65
Standards UL 583 and EC declaration of incorporation of partly completed machinery according to EN1175-1.


APS Model Nominal DC supply voltage Rated RMS current (S2, 2min)* Rated RMS current (S2, 1h)** Rated power (S2, 2min)* Rated power (S2, 1h)**
APS24M 24 V 70 A 30 A 2.1 kVA 0.88 kVA
APS24L 24 V 80 A (90 A peak***) 40 A 2.6 kVA 1.2 kVA
APS36M 36 V 70 A 30 A 3.1 kVA 1.3 kVA
APS36L 36 V 80 A (90 A peak***) 40 A 4.0 kVA 1.8 kVA
APS48M 48 V 70 A 30 A 4.1 kVA 1.8 kVA
APS80M 80 V 40 A 20 A 3.9 kVA 2.0 kVA

*2 minute rating at 8 kHz switching frequency and 25ºC ambient temperature
**1h rating at 8 kHz switching frequency and 40ºC ambient temperature
***24L and 36L peak current only for short time i.e. boost in 30 sec