| Patent Number |
Title Of Patent |
Date Issued |
| 7568274 |
Method for manufacturing magnetostrictive torque sensor device, and electric power steering appa |
August 4, 2009 |
| A method for manufacturing a magnetostrictive torque sensor device includes the steps of: providing a steering shaft or another such rotating shaft with two magnetostrictive parts endowed with magnetic anisotropy; disposing detection coils around the magnetostrictive parts to detect |
| 7478568 |
Magnetostrictive torque sensor system and electric power steering apparatus employing the same |
January 20, 2009 |
| A magnetostrictive torque sensor system stabilizes and detects steering torque applied to a steering shaft. The sensor system comprises magnetic-characteristic variation parts that are provided to the steering shaft, wherein magnetic characteristics of the magnetic-characteristic var |
| 7188702 |
Electric power steering apparatus |
March 13, 2007 |
| An electric power steering apparatus is provided, which has a first device for detection of steering torque, a motor, a motor drive unit, a second device for determining a target current based upon at least a signal of steering torque, a third device for detection of a motor current, and |
| 6973992 |
Electric power steering apparatus |
December 13, 2005 |
| An elect power steering apparatus includes a motor drive circuit for PWM-driving an electric motor to generate a steering assist torque corresponding to a steering torque. The motor drive circuit includes a bridge circuit formed by a plurality of FETs, and a predrive circuit for driv |
| 6926299 |
Electric steering apparatus |
August 9, 2005 |
| An electric steering apparatus includes a brushless motor 3 which applies torque to a steering system through a speed reduction mechanism 4, and a resolver 7 which detects a rotation angle of the output shaft 31 of the brushless motor 3. The resolver 7 is arranged between the brushless m |
| 6868936 |
Electric power steering apparatus |
March 22, 2005 |
| An improvement to an electric power steering apparatus which applies an assisting torque produced by an electric motor in correspondence with a steering torque to a rack shaft by way of a belt type transmission mechanism. A driving pulley of the belt type transmission mechanism is mo |
| 6864605 |
Brushless motor and electric power steering apparatus equipped with the brushless motor |
March 8, 2005 |
| Brushless motor is provided which includes an outer stator and an inner rotor having a plurality of permanent magnets. One or inner surface of the outer stator, opposed to the inner rotor, is covered with a cover formed of a magnetic material and in the shape of a cylinder of a small wal |
| 6838844 |
Electric power steering apparatus |
January 4, 2005 |
| An electric power steering apparatus includes a steering torque detector, a brushless motor PWM-driven with a three-phase alternating motor current, a target current setting section for setting a d-axis target current value and a q-axis target current value, motor current detectors for d |
| 6719089 |
Electric power steering apparatus |
April 13, 2004 |
| In en electric power steering apparatus, a motor controller unit controls PWM driving of a brushless motor for imparting a steering torque assist, on the basis of output signals of at least a steering torque detector section, motor current detector section and rotational angle detector |
| 6715578 |
Cable steering system |
April 6, 2004 |
| A cable steering system is provided in which first control means controls the operation of a power steering motor disposed between Bowden cables and wheels based on a steering torque detected by a steering torque detection means disposed between a steering wheel and the Bowden cables, an |
| 6679350 |
Electric power steering apparatus |
January 20, 2004 |
| An electric power steering apparatus capable of controlling a brushless motor accurately and providing excellent steering feeling as well as maintaining the reliability of a control means. The electric power steering apparatus includes a motor, a steering torque detection means (stee |
| 6543569 |
Electric power steering apparatus |
April 8, 2003 |
| An electric power steering apparatus comprising a rack shaft having two racks, a first rack-and-pinion mechanism for transferring a steering torque to the rack shaft, and a second rack-and-pinion mechanism for transferring an assist torque to the rack shaft. The second rack-and-pinio |
| 6422095 |
Magnetostrictive torque sensor and electric power steering apparatus including the same |
July 23, 2002 |
| A magnetostrictive torque sensor includes a magnetostrictive film of width W provided along a circumference of a rotational shaft. The film causes magnetostriction in correspondence to a torque applied to the rotational shaft. The torque sensor also includes excitation and detection core |
| 6390230 |
Electric power steering apparatus |
May 21, 2002 |
| An electric power steering apparatus having a motor for producing assist torque according to the steering torque, and a rack and pinion mechanism for transferring torque assistance to the rack shaft. The pinion and rack of the rack and pinion mechanism are both helical gears, and transfe |
