In this paper, speed control of Permanent Magnet Synchronous Motor (PMSM), also known as sinusoidal BLDC motor, using Hall effect sensors is described. Normally, sensors like optical encoders or resolvers are necessary for applying sinusoidal commutation to such type of motor as they have more resolution. However, these sensors are costly and cannot be employed for low cost operations. The proposed approach for sinusoidal commutation uses rotor position information available from Hall sensors to apply sine PWM pulses for the inverter switching. The modulation index in this method is changed using PI controller for speed control of PMSM. The method has been tested successfully on a setup of 400W PMSM motor using Texas Instrument (TI) DSP controller TMS320F2812. Experimental results indicate that the motor drive developed in this paper exhibits satisfactory performance.
This paper presents a novel hall sensor fault detection and fault tolerant control system for Hall Effect position sensors failure of permanent magnet synchronous motor. The proposed system is capable to accurately detect and promptly identify exactly which of the Hall Effect sensors has undergone breakdown when the fault occurs. A simple method to generate the commutation signal even with faulty Hall Effect sensor to maintain the proper operation of PMSM after fault occurrence is discussed in this paper. The proposed fault tolerant control system does not need massive computational efforts and can be implemented as a subroutine in the main control program of the PMSM. In addition, the transitions between healthy and fault-tolerant control conditions are smooth without any additional noise and jerk. Experimental results have been presented to prove the validity of the proposed algorithm.
In this paper an Innovative scheme for reduction of Power Requirement of Electromechanical Servo Drive used in heavy load weapon system articulation is presented. An electromechanical servo drive system is used for raising and lowering of heavy load weapon system for positioning it at predefined angle. Power requirement of this Servo Drive is very large due to heavy load. To reduce the power and torque requirement an innovative scheme with torsion bar is used. Torsion bar stores energy during lowering of load and releases it during raising the load. In this paper, application and design of torsion bar scheme is discussed which is used in a prestigious weapon system program.
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