Patent Number: 6,253,885

Title: Eddy current brake for automotive vehicles

Abstract: An eddy current brake having an electromagnetic pole and a rotor journalled for rotation in a torque delivery shaft of an automotive vehicle driveline, the rotor being rotatably positioned in close proximity to the stator with an air gap between them. The stator comprises steel pole pieces with hollow cores that establish a magnetic circuit for a magnetic flux field. The pole pieces have machine-wound electrical windings. The windings are fastened with pole caps. The hollow core reduces the weight and material of the stator without significantly adversely affecting the braking capacity of the retarder brake for any given speed of rotation of the rotor and for any given number of ampere-turns for the stator windings. The pole caps reduce the magnetic saturation and increases the overall brake torque output.

Inventors: Tsai; Hong (Farmington Hills, MI), Xiang; Youqing (Canton, MI)

Assignee: Visteon Global Technologies, Inc.

International Classification: B60L 7/28 (20060101); B60L 7/00 (20060101); H02K 49/04 (20060101); H02K 49/00 (20060101); B60L 007/00 ()

Expiration Date: 07/03/2018