Development of Torque Sensor with Nickel-Iron Alloy Plating for Pedal-Equipped Electric Vehicles

Paper #:
  • 2013-32-9045

Published:
  • 2013-10-15
Author(s):
Affiliated:
Pages:
10
Abstract:
This paper describes the development of non-contacting detection type torque sensor that realizes a small lost motion with light weight and low cost.Pedal-equipped electric vehicles are becoming popular in recent years. In those vehicles, torque sensors are usually necessary for measuring the pedaling force to determine the motor torque.We applied an integrated sensing structure and a non-contacting scheme utilizing inverse-magnetostrictive material to minimize the lost motions. As for the sensing material, nickel-iron alloy plating was used to obtain a wide dynamic range.In the tests using the actual structure, the output linearity deterioration occurred because of the strain distribution dispersion produced by the ratchet drive structure. Therefore, the effect of this strain distribution was examined.The inverse-magnetostrictive sensing material of nickel-iron alloy plating has an extremum on its output curve. The linearity deterioration occurs when the distribution of the strain ranges over this extremum because this coupled situation causes the errors on the sensor output yielded by the mean value over the range.This fact was verified by the Computer-Aided Engineering (CAE) and the linearity deterioration mechanism was made clear.Based on these, the sensing structure was modified to optimize the bias-torque directions and our objectives were achieved.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$28.00
Mail
$28.00
Members save up to 42% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Technical Paper / Journal Article
1990-02-01
Standard
2014-01-06
Technical Paper / Journal Article
1990-02-01
Technical Paper / Journal Article
1990-02-01
Technical Paper / Journal Article
1990-02-01
Technical Paper / Journal Article
1990-02-01
Book
2013-07-01
Training / Education
2013-04-09
Technical Paper / Journal Article
1990-02-01