EN
L 212/258
Official Journal of the European Union
12.8.2022
— Where the actual value of the grid point for the normalised torque is larger than zero:
ηðT norm;i ; ωnorm;j Þ ¼
T norm;i Ü ωnorm;j Ü 0,96 T norm;i Ü ωnorm;j þ Ploss;norm ðT norm;i ; ωnorm;j Þ
where: η
= efficiency [–]
Tnorm,i
= normalised torque for all gridpoints defined in accordance with subpoint (d)(ii) above [–]
ωnorm,j
= normalised speed for all gridpoints defined in accordance with subpoint (d)(i) above [–]
Ploss,norm = normalised loss power determined in accordance with subpoints (a) to (c) above [–] (e) From the efficiency map determined in accordance with subpoint (d) above, the actual power loss map of the electric machine system shall be calculated in accordance with the following provisions: (i) For each gridpoint of normalised speed defined in accordance with subpoint (d)(i) above the actual speed values nj shall be calculated in accordance with the following equation: nj = ωnorm,j × nrated where: nj
= actual speed [1/min]
ωnorm,j
= normalised speed for all gridpoints defined in accordance with subpoint (d)(i) above [–]
nrated
= rated speed of the electric machine system determined from the data generated in accordance with Step 2 above [1/min]
(ii) For each gridpoint of normalised torque defined in accordance with subpoint (d)(ii) above the actual torque values Ti shall be calculated in accordance with the following equation: Ti = Tnorm,i × Tmax where: Ti
= actual torque [Nm]
Tnorm,i
= normalised torque for all gridpoints defined in accordance with subpoint (d)(ii) above [–]
Tmax
= overall maximum torque of the electric machine system determined from the data generated in accordance with Step 2 above [Nm]
(iii) For each gridpoint defined in accordance with subpoints (e)(i) and (e)(ii) above the actual power loss shall be calculated in accordance with the following equation:
Ploss ðT i ; nj Þ ¼ ð1 Ä nð
nj Ti 2π ; ÞÞ Ü jT i j Ü nj Ü T max nrated 60
where: Ploss
= actual loss power [W]
Ti
= actual torque [Nm]
nj
= actual speed [1/min]
η
= efficiency dependent on normalised speed and torque determined in accordance with subpoint (d) above [–]
Tmax
= overall maximum torque of the electric machine system determined from the data generated in accordance with Step 2 above [Nm]
nrated
= rated speed of the electric machine system determined from the data generated in accordance with Step 2 above [1/min]