Performance Analysis of High Power Brushless DC Motor Drive
Brushless motors are replacing most of the conventional application that were driven by induction motors in recent times. This is majorly due to the advancement and the proliferation of control techniques for the operation of such machines. The critical c
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Abstract Brushless motors are replacing most of the conventional application that were driven by induction motors in recent times. This is majorly due to the advancement and the proliferation of control techniques for the operation of such machines. The critical choice in electric vehicle applications is on the capability of motoring and generative characteristics. These types of machines are viable candidate as with its extended constant power range operation replacing the conventional multi-gear transmission. However, the major challenges in such type of machines is twofold, one with the cogging force generated in the operation mainly due to the magnetic orientation of the machine and the second one due to the switching ripple significantly increase the ripple content in the machine. In this paper, the performance of the 5 kW BLDC machine used for electric vehicle operation is reported in terms of torque and current characteristics.
Keywords BLDC Dual magnetic circuit Motor constant square density
Generative Electric vehicle
1 Introduction Three phase Brushless DC machine (BLDC) is finding major applications in recent times for commercial and industrial applications. However, the presence of cogging torque heavily due to the rotational magnetic forces is a daunting challenging. Cogging is addressed in two ways one with the machine design structure and through the control aspects the harmonic could be controlled. The lower the cogging torque produced, the better the torque performance of the motor. Thus, R. Babu Ashok (&) B. Mahesh Kumar Electrical & Electronics Engineering, Pondicherry Engineering College, Pondicherry 605014, India e-mail: [email protected] B. Mahesh Kumar e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2018 A. Garg et al. (eds.), Advances in Power Systems and Energy Management, Lecture Notes in Electrical Engineering 436, https://doi.org/10.1007/978-981-10-4394-9_71
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reduction of cogging torque is critical for improved performance. BLDC motors work by exciting the 3 phase coil and when the magnet reaches the first phase, the second phase is excited and pulls the motor to the next phase. This process is repeated from phase 1 to other phase to produce a full revolution of the motor. The structure of brushless motors is quite similar to the permanent magnet synchronous motor. However, the sensor to detect the rotor position or magnetic poles to produce signals in order to control the electronic switches is required for its operation, commonly Hall sensor [1–8].
2 Design Challenges and Approach to Mitigate 2.1
Design Approaches
There are two ways to approach the reduction in cogging value and the ripple reduction. One way to mitigate the cogging is the structural approach in the magnetic circuit control design that can produce the reduced cogging value. The second approach is through the use of advanced control logic in the operational of the power electronic circuit that operates the machines. A number of parallel
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