background: construction work (building houses, roads, workplaces, and repairing and maintaining infrastructures) is a dangerous land-based job. this includes many hazardous tasks and conditions such as working at the following conditions: height, excavation, noise, dust, power tools and equipment. construction work has been increased in developed and underdeveloped countries over the past few ...

The safety of people and the environment is an important issue at any enterprise. One main threats in production occurrence fire failure electrical equipment. Fire alarm systems provide immediate evacuation fight source fire. article describes implementation circuit system based on a non-contact temperature sensor Hall effect current sensor, which necessary for prevention. experiment showed tha...

This paper introduces a BLDC fan motor driver system using modified sinusoidal PWM (SPWM). The driver board is assembled in the motor to minimize system size. Based on the signal from the hall position sensor on the board, the controller generates the SPWM to the power module to drive the BLDC motor. Because it's SPWM instead of square PWM, there is no pulsation torque. The simulation and exper...

To determine the planar motion of a 6-DOF precision stage, a measurement system based on three Hall sensors is adopted to obtain the X, Y, Rz motions of the stage. The machining and assembly errors in the actual mechanical system, which are difficult to measure directly, cause the parameters in the model of the Hall measurement system to deviate from their designed values. Additionally, the ver...

DC–DC buck converters have become prominent components for energy optimization in power systems, and how to improve control performances is a challenging issue be addressed. In this paper, we aim investigate the harmonic problem of sliding mode (SM) controlled imposed by often-ignored unmodeled dynamics Hall sensor. The unified mathematical model whole system established combining SM controller...