Automated copper loss calculation for switched reluctance machines

Abstract

Copper loss calculation in switched reluctance machines is important to predict efficiency and to predict temperature hotspots in the machine. Established calculation methods for alternating current (AC) copper losses are either inaccurate or time consuming. This paper presents a tool chain for copper loss calculation which enables fast and accurate model building and simulation procedure. Employment of the tool chain requires only a few minutes of attention by the design engineer, but provides high accuracy. The losses of each conductor are calculated seperately over time. This enables detailed analysis of the winding design and the identification of the cause of the losses. With this method, an improved winding design can be easily identified.

Direct instantaneous torque and force control: A novel control approach for switched reluctance machines

“…The simulation methodology from [8] and [9] has been applied. The copper losses P cu including current displacement have been taken into account as well as the iron loss P iron .…”

Direct instantaneous torque and force control: a control approach for switched reluctance machines

“…The simulation methodology from [23] is applied to the copper losses. The total copper losses occurring in the windings consist of ohmic losses and eddy current losses .…”

Comparison of Aluminum and Copper Winding Materials for Switched Reluctance Machines with Finite Element Analysis

“…The electrical conductivities of Al and Cu at 20 °C are Cu losses in a fixed area are calculated using the Ohmic DC (direct current) resistance ( DC R ) and current (I), as given in Equation ( 2) (Schenk and de Doncker, 2013). As seen in Table 1, the electrical resistances and densities of Cu and Al are different.…”

“…In general, the total losses are calculated with the specific resistance ( ρ ) and the current density ( j ) as given in Equation (3)(Schenk and de Doncker, 2013).…”