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In this paper, a current-error-based iterative learning controller (ILC) with nonlinear is proposed to improve the position-tracking performance in permanent-magnet (PM) stepper motors. Our method comprises ILC for mechanical dynamics and current dynamics. A using variable structure designed obtain field-oriented control. This can cause PM motor become single-input single-output linear system a...

Article history: Received 25 October 2012 Accepted 14 April 2013 Available online 2 June 2013

November 2003 The L297 Stepper Motor Controller is primarily intended for use with an L298N or L293E bridge driver in stepper motor driving applications. It receives control signals from the system’s controller, usually a microcomputer chip, and provides all the necessary drive signals for the power stage. Additionally, it includes two PWM chopper circuits to regulate the current in the motor w...

Multi-axis stepper motors offer a compact solution to actuate multiple degrees of freedom in mechanical system by single device. This research presents an electric motor with three coaxial shafts driven stator. The dimensions are 42 × 44 mm$^3$ (excluding output shafts), its mass is 0.326 kg and it includes rotors height 7 mm different number teeth. maximum torque for one rotor at low speed 1 A...

We present the design, fabrication and characterization of a novel microvalve realized by combining micro and fine machining techniques. The design is for high flow rates at high pressure difference between inlet and outlet, burst pressure of up to 15 bars, there is no power consumption required for the valve to maintain its position during operation in any intermediate state and the process ga...

Vibration torque are existence obviously during operation of stepping motor, it is a periodic structure vibration problem. In this paper, the actual vibration torque testing of stepper motor is executed through a selfmade vibration torque sensor, the experimental results show that the stepping motor vibration torque of single three shot operation is more bigger than the six shot, and obvious re...

This paper presents the detailed mathematical and Simulink® model of a two-phase stepper BLDC motor in the machine variables, proving the rotor's position role in supplying the motor. Then an extended Kalman filter (EKF) is designed to estimate the motor state variables: stator currents, and the rotor position and velocity, on the basis of noisy measurements of stator currents, since it has a n...

This technical note highlights the system requirements and operating conditions of automatic air recirculation valves and reviews compatibility of existing actuator types with these requirements. When comparing the available technologies, it becomes clear that air recirculation flap actuators containing a bipolar stepper motor offer key advantages over actuators with other motor types. It is sh...

We present three novel mechanical laser shutter designs based, respectively, on a stepper motor, a relay, and a piezoelectric actuator. Each shutter type is ideally suited to a specific shuttering application. The stepper motor is well suited for applications requiring low vibrations, the relay is compact and capable of rapid bursts, and the piezoelectric is 2 orders of magnitude faster than ot...