Design Improvement of a Small, Outer Rotor, Permanent Magnet Vernier Generator for Supplying Traffic Enforcement Camera

Road speed cameras are usually used in photovoltaic power plants, especially in the areas with limited or no access to grid power. However, there are many areas in Iran where wind power is more accessible than solar energy. So, in this study, a small permanent magnet vernier generator is designed to meet power concussion requirements of traffic enforcement camera. The designed generator is optimized to achieve lower harmonic content of no-load induced voltage and lower cogging torque. In this regard, the effect of geometrical dimensions and the configuration of permanent magnets are investigated using three-dimensional time stepping finite element method. Both no-load and full-load performances of the generator are discussed, and finally, a prototype of the optimal generator is built and tested. A close agreement is obtained between simulation and experimental results, validating the success of the design and optimizations.