the depth control systems used in iranian tractors are mechanical and they produce variable tillage depth in uneven field surface. in this research a rotary type electronic control valve was designed and constructed. by using this valve, electro-hydraulic tillage depth control system was developed and installed on the tractor. the control system was composed of: a depth sensor, a programmable l...

This paper describes the design and implementation of microstepper motor drive and a control system for two-phase hybrid stepper motor. Based on LM3S6965 arm processor, this paper proposes an approach to subdivide the step to microstep with required number of steps for stepper motor to improve positioning accuracy. Sine/cosine microstepping method is used to adjust the current in each winding o...

Stepper motors are used for position control applications. The sensorless position control for a hybrid stepper motor without using mechanical sensors is presented in this paper. Extended Kalman filter is used to estimate the instantaneous speed and position required for the field oriented control of the stepper motor. Extended Kalman filter algorithm estimates the state of the system from the ...

This paper considers adaptive position control of a permanent magnet (PM) stepper motor using exact linearization via static state-feedback. Physical outputs are chosen in such a way that the resulting closed-loop system is linearized and decoupled. The objective of the adaptive controller for a PM stepper motor is to achieve output tracking between the motor outputs and prescribed reference si...

Due to the development of digital control systems, hybrid stepper motors became more attractive to be used in robotics and computer numerical control machines where they have to perform high-precision positioning operations without any feedback sensor. However, at open loop control (especially at higher stepping rate), the speed response of the stepper motor suffer from large overshoot, oscilla...

This paper describes the simulation of arm movements of a stepper motor controlled pickand-place robot using the mathematical model of a stepper motor. The model includes: a) a model of the stepper model driver board, b) a model of the hybrid stepper motor and load combination, and c) the interconnection of the two models which is used to simulate the motions of the base, shoulder, elbow, and w...

This paper presents the study on high – current PWM, unipolar stepper motor controller/driver, are remarkable for simplicity, high – reliability, multifunctional facilities for four phases hybrid stepper motor.

Wireless stepper motor controller designed using Very High Speed Integrated Circuit Hardware Description Language (VHDL) and is implemented on SPARATAN Field Programmable Gate Array (FPGA). The proposed motor controller is controlled by using Pulse Width Modulation Technique (PWM) thus giving the very high precision. Due to high torque of stepper motor it is capable of handling the big industri...

This communication presents the design concept of a new spherical stepper motor capable of three-degrees-of-freedom (DOF) motion in a single joint. The ball-joint-like motor has no singularities except at the boundary of the workspace and can perform isotropic manipulation in all three directions. Due to its relatively simple ball-like structure, undesired cross-coupling and centrifugal compone...