BLDC Motor Speed Control Using Co-Simulation Of Multisim and Labview

Abstract

Brushless dc motor is finding various applications in the present day scenario. They have improved efficiency, higher speed, better torque speed characteristics and faster dynamic response when compared with the traditional motors. In this paper, a controller is developed based on co-simulation of multi sim and lab view and is presented for low cost brushless dc motor drive with low-resolution hall sensors. The driver circuit is made using a low cost MOSFET gate driver IC in multi sim and the controller is developed in lab view. A hall sensor is usually used to commutate the BLDC motor and the hall sensor output is used as the gate pulse for the six pulse inverter. The effectiveness of the design was verified through co-simulation.Keywords: BLDC, gate driver circuit, control circuit multi sim, lab view, co-simulation. I.INTRODUCTION Brushless dc motor (BLDC)are also known as synchronous motors, in which the rotor is a permanent magnet and the stator is the steel lamination stacked inside the stator slots [1]. In order to control the positioning of the rotor and the speed of the BLDC motor hall effect sensors are used.For obtaining a reliable speed, from the hall sensor signals control for time difference inverse is found. At lower speed the sampling time for speed regulation is still more. The sampling time is dependent to the motor speed and this makes it difficult to design the speed regulator for the model. For obtaining accurate speed control and to reduce any difficulty in designing speed regulator a low resolution encoders that works in low speed is used with the BLDC motor . A simple and easy implementation based on the reduced order disturbance torque at an instantaneous speed was explained by N.J Kim [2]. In [3] a new method was proposed to obtain the rotor speed and position with an out time delay known as dual observer. A low speed model with free enhancement differentiator was proposed for improving the velocity [4] [5.]. While considering the BLDC motor commonly used speed recognization method is using the back emf estimation. When the rotor speed is very less this method cannot be used to find the speed and position due to the inverter design and variation in parameters used. This paper presents study of controlling the speed of a brushless dc motor with the hall effect sensor using multisim and labview.

Hardware and Software Solution Developed in Arm Mbed Environment for Driving and Controlling DC Brushless Motors Based on ST X-Nucleo Development Boards

“…The lead between rotor and rotating field must be controlled to produce torque and this synchronization implies accurate knowledge of rotor position. For this reason, three Hall sensors are used to detect rotor orientation and speed very precisely by measuring variations in the magnetic field [12][13][14][15][16][17]. The BLDC motor control can be done in sensor or sensor-less mode; the advantage of sensor-less BLDC motor control is that the sensing part can be omitted and thus overall costs can be reduced, on the contrary the disadvantages are higher requirements for control algorithms and more complicated electronics.…”