Modeling of noises from EPS motor and noise reduction filter design

Noises from Electric Power Steering (EPS) motor will be considered in this paper. We will discuss noises from EPS motor and noise reduction structure design. Technologies for designing power electronic circuits which are used in everything from industrial and communications equipment to household electrical appliances are an important factor that determines the quality and cost of such products. In recent years regulations concerning electromagnetic noise (emissions) have been tightened. It has become necessary to obtain the CE marking based on the recommendations of CISPR (Comite international Special des Pturbations Radioelectriques) and other institutions in Europe as well as certification from the FCC (Federal Communications Commission) in North America in order to export products to those regions. Regulations are also being tightened in the Japanese domestic market. Under these circumstances, technologies for determining filter configurations and the like at the design stage by simulating the noise generated by power electronic circuitry have been growing in importance in order to raise the reliability of products yet reduce their cost. Regarding noise reduction rubber (mechanical measurement) and noise filtering technologies(electrical measurement) and, progress is being made in studies of active filters, which are configured to generate voltage of opposite phase to cancel out noise, in addition to conventional passive type filters.