×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Electric hydraulic PAS pumps

Electric hydraulic PAS pumps

Electric hydraulic PAS pumps

(OP)
A lot of cars now use electric pumps to power conventional hydraulic PAS systems. Feel can be made speed sensitive, less parasitic losses on the engine, etc.

Is there a good primer anywhere on the details of the technology?

Questions that spring to mind are:

Who are the usual suppliers?
What kind of motors, brushed or brushless DC?
Is there a separate PAS control module?
Or a separate power module (control in the engine ECU)?
What new sensors are in use (pump pressure, pump speed, rack pressure etc.)?

Thanks, Ian

RE: Electric hydraulic PAS pumps

Hi Ian,

I'm involved in this area because we supply a motor positon sensor for an EPAS motor application. I hope I can provide you some assistance.  For any specific questions please PM me.

Who are the usual suppliers?
Globe Motors, EBM Papst, Denso, Brose, AMK, Mitsubishi Electric, Mark IV, ASMO, NIDEC, IXETIC and AISIN.

What kind of motors, brushed or brushless DC?
In the majority of cases BLDC motors are used.

Is there a separate PAS control module?
Typically there is a steering ECU which is provided the signal from the BLDC motor position sensor.

What new sensors are in use (pump pressure, pump speed, rack pressure etc.)?
Sensors are essentially used for motor commutation. In the past three-phase hall effect arrays were used. These arrays have the problem that at high speeds they miss phases which effects the commutation of the motor.  Our AMR based sensor is used to measure speed, direction of rotation and position.  Another possibility is to use a resolver to measure the same characterisitics of the motor. The signal is sent to the ECU and contrasted with the signal from the steering angle and torque sensor to confirm functionality.

Do you mind if I ask what your interest is in this area?

Best Regards
 

RE: Electric hydraulic PAS pumps

(OP)
Our interest is in replacing an engine driven hydraulic pump with an electric powered pump. Not for power steering but for a transmission application.

We've spec'd an industrial motor with a separate controller for the prototype. But in the longer term we'd need a supplier of an automotive motor with integrated controller that can survive in the engine compartment.

Electric power steering pump motors look ideal, although the pump would not be the same.

Thanks, Ian

RE: Electric hydraulic PAS pumps

Hi Ian, I don't represent any of these companies so this should not be considered as a promotion. However the following companies should be able to help you Ixetic, Nidec
and Brose. PM me if you want specific contacts at these companies. Best Regards

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources