## General

#### How to evaluate signal norms only for a portion of the time range calculated in a transient analysis in Ansys Maxwell when the frequency is defined as a parameter? For example, evaluate the mean core losses for the last electric period simulated.

• Solution
Participant

Since the â€śrange functionsâ€ť do not accept parameter values as limits, a different approach has to be used. The total number of periods of the simulation should be known. Assuming the following parameters N_periods â€¦ Total number of electric periods of the transient simulation ElectricPeriodâ€¦.. Electric period of the signal (i.e., 1/(electric frequency)) To calculate the average core loss during the last period, following expression can be used: integ((time>(N_periods-1)*ElectricPeriod)*CoreLoss)/(ElectricPeriod) The comparison expression, (time>(N_periods-1), returns 1 or 0 depending on if it is true or false and works as a â€śmaskâ€ť for the integral. This expression returns a transient signal which is constant. Its value is the average value required. To obtain a single scalar number the everage function can be applied to it. This leads to: avg( integ((time>(N_periods-1)*ElectricPeriod)*CoreLoss)/(ElectricPeriod) ) This reasoning can be adapted to different situations, for example: â€“ Different quantities (e.g. mean torque, replacing CoreLoss above by Moving1.Torque) â€“ Calculation along a different window (e.g., multiple electric periods at the end of the simulation, by replacing â€śN_periods-1â€ť by some other criterion) â€“ Calculation of different signal norms (e.g., average, rms, pkavg), since these norms are often mathematically expressed as one or multiple integrals (with varying integrands) divided by the â€świndowâ€ť of the integral. A calculaiton of the RMS value of the induced voltage of a winding with a name PhaseA would require the following expression: avg(sqrt(integ((time>=(N_Periods-1)*ElectricPeriod)*(InducedVoltage(PhaseA))^2)/ElectricPeriod)) Attached to this solution there is a project example clarifying the approach to calculate the average core loss for the last electric period and the rms value of the induced voltage across a winding. These expressions can also be used when defining calculation quantities for an Optimetrics analysis. This is also demonstrated in the example attached. Please review the Optimetrics Tab.

Attachments:
1. 2065332.zip