Noise Radiation of Switched Reluctance Drives

To simulate noise emissions of switched reluctance machines (SRMs), the entire signal transmission chain has to be modeled, starting with the radial force and ending with the radiated sound. Especially the last element of this transmission chain, the radiation characteristic of an SRM, is very rarely addressed in literature. This paper gives a brief introduction to noise development in SRMs and then presents the first phase-exact measurement of the radiation characteristic of an SRM that is known to the authors. Furthermore, methods to simulate the sound radiation are introduced.