Abstract: Disclosed herein is a method for controlling an electric power steering system, wherein a motor is controlled by vector control and driven by a current command value calculated on the basis of a parameter such as a steering torque to provide a steering assist power to a vehicle steering system, and further wherein the current command value is limited on the basis of desired output characteristics and a desired angular speed during a field-weakening control and a non-field-weakening control of the vector control.

Abstract: Disclosed herein is a method for controlling an electric power steering system, wherein a motor is controlled by vector control and driven by a current command value calculated on the basis of a parameter such as a steering torque to provide a steering assist power to a vehicle steering system, and further wherein the current command value is limited on the basis of desired output characteristics and a desired angular speed during a field-weakening control and a non-field-weakening control of the vector control.

Abstract: A control apparatus of an electric power steering apparatus is provided in which a nonlinear element of a motor model of-the electric power steering apparatus is compensated beforehand to linearize the motor model and the back electromotive force of the motor is computed to compensate the back electromotive force for a control loop, and conduct back electromotive force compensation with no lag in order to realize a control apparatus of an electric power steering apparatus with less control error, stable controllability, small motor output torque ripple, good wheel steering feeling, and less motor noise.

Abstract: A control apparatus of an electric power steering apparatus is provided in which a nonlinear element of a motor model of-the electric power steering apparatus is compensated beforehand to linearize the motor model and the back electromotive force of the motor is computed to compensate the back electromotive force for a control loop, and conduct back electromotive force compensation with no lag in order to realize a control apparatus of an electric power steering apparatus with less control error, stable controllability, small motor output torque ripple, good wheel steering feeling, and less motor noise.

Abstract: A control device for an electric power steering apparatus includes a control unit which controls a motor giving steering assist force to a steering system according to a current command value computed based on steering toque and vehicle speed in a vector control manner and an advance angle map for compensating for a phase lag occurring in a motor current relative to the current command value. Advance angle compensation is made for the current command value based on the advance angle map.

Abstract: The present invention provides a motor control method and a motor controller. In the motor control method and the motor controller according to the present invention, even when production tolerance of a motor or a control unit (ECU) or the change of an environment arises, abnormal sound of the motor due to the saturation of a motor applied voltage (Duty 100%) is not generated and a maximum output of the motor can be obtained and they may be applied to an electric power steering device. In a motor control method for controlling a motor by a motor driving voltage command value of a PWM, the motor control method includes the steps of calculating a degree of saturation of a motor driving voltage, and correcting a motor current command limit value based on the degree of saturation of the driving voltage.

Abstract: This invention provides an electric power steering device in which a steering assist force is applied to a steering system of a vehicle using a motor. The electric power steering device includes a first calculating part for calculating a steering assist command value based on a steering torque and a vehicle speed, a drive control part that controls drive of the motor based on the steering assist command value, a second calculating part for calculating a steering assist command limit value based on a source voltage and a motor rotating speed, and a limiting part for limiting steering assist command value based on the steering assist command limit value.

Abstract: A motor drive control apparatus for controlling a motor has a main control part that performs a flux weakening control by a vector control of d-q axes and a rate-limit control part that controls a rate of change in a d axis current command value in the vector control. Further, there is provided a motor control apparatus for controlling a motor has a motor angular speed detection part that detects a motor angular speed of the motor and a motor control part having a current control system that controls the electric motor based on a motor current and a current command value. The motor control part calculate the current command value in which torque becomes constant by considering characteristics of the current control system based on a motor angular speed detected by the motor angular speed detection part.

Abstract: A control apparatus of an electric power steering apparatus is provided in which a nonlinear element of a motor model of-the electric power steering apparatus is compensated beforehand to linearize the motor model and the back electromotive force of the motor is computed to compensate the back electromotive force for a control loop, and conduct back electromotive force compensation with no lag in order to realize a control apparatus of an electric power steering apparatus with less control error, stable controllability, small motor output torque ripple, good wheel steering feeling, and less motor noise.

Abstract: In order to precisely control rotation of a motor, it is necessary to precisely detect a position of a rotor. Even if an inexpensive position detecting sensor having relatively low precision such as a Hall sensor is used, it is possible to provide a motor drive control apparatus capable of precisely detecting the position of the rotor by calculating an electrical angle of the rotor (rotor position) by calculating a back-EMF from a detected voltage, detected motor current, a motor winding resistance value and an inductance value, and by periodically correcting a calculation error of the calculated electrical angle. If such a motor drive control apparatus is used, it is possible to provide an inexpensive electric power steering apparatus having excellent steering feeling.

Abstract: The present invention provides a motor drive apparatus and an electric power steering apparatus using the same, in which the motor can be vector controlled even if a motor position detection sensor such as a hole sensor which cannot output a precise and detailed rotation angle signal when the motor rotates at low speed, field weakening control can reliably be carried out even if there exists detection error of a motor position detection sensor or the like, and motor output having small torque ripple can be expected.