This Paper presents compact regenerative braking scheme for a PM BLDC motor driven electric two wheeler. Electric vehicles have been attracting unprecedented attention in light of the volatile market prices and prospect of diminishing supplies of fuel. Advances in battery technology and significant improvements in electrical motor efficiency have made electric vehicles an attractive alternative, especially for short distance commuting. This paper describes the application of Brushless DC (BLDC) motor technology in an electric vehicle with special operation on regenerative braking. BLDC motors are frequently used for electric vehicle due to its high efficiency & robustness. In an electric vehicle, regenerative breaking helps to conserve energy by charging the battery, thus extending the driving range of the vehicle.
- Regenerative braking
- BLDC Motor
- Electric vehicle
Fig. 1 Equivalent circuit of an inverter driven 3- phase PM BLDC motor
EXPECTED SIMULATION RESULTS:
Fig. 2. Drive cycle with maximum vehicle speed of 25 kmph (corresponding motor speed 330 rpm)
Fig. 3. Battery power and current during combination of regenerative braking and mechanical braking.
Fig.4. Acceleration signal, brake signal, vehicle speed and distance travelled.
Fig.5. Comparision of SOC for different braking methods
In this paper, the line back –EMF based regeneration Technique is used. The performance presented in this paper gives better than conventional mechanical braking in two wheeler EVs.Ultra capacitor is used as secondary energy storage, with regards to its remarkable properties, has used to improve the acceleration performance and regenerative braking efficiency. Further, the presented method is the simplest one among the known regenerative methods in terms of the simplicity of the system, ease of implementation. This control system developed higher braking torque than conventional mechanical braking. The proposed control strategy also gives a higher electric regenerative braking efficiency and better control performance. In an electric vehicle, regenerative breaking helps to conserve energy by charging the battery, thus extending the driving range of the vehicle.
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