Table 1.
Assumed parameters for the calculations.
| Parameter | Description | Value | Unit |
|---|---|---|---|
| jm | Current density | 6 | i |
| kwz | Slot fill factor | 0.5 | - |
| Sz | Stator slot area | 495 | mm2 |
| pp | Number of pole pairs | 8 | - |
| lFe | Length of the stator core | 25 | mm2 |
| wt | Width of one stator tooth | 10 | mm2 |
| Btm | First-harmonic amplitude | 1.25 | T |
Figure 1.
Flux density distribution in the PMCM obtained from Ansys Maxwell simulations. The magnetic flux density (B-field) scale ranges from 0 T (blue) to 1.653 T (red). PMCM, permanent magnet cogging motor.
Figure 2.
Torque waveform and corresponding average value for a single PMCM segment derived from Ansys Maxwell simulations. The relationship between torque (Nm) and rotor position (mechanical degrees) is shown, with a mean value of approximately 13.7 Nm in the interval of 0–50 mechanical degrees. PMCM, permanent magnet cogging motor.
Figure 3.
(a) General concept of the rotor construction and (b) wound stator segments with separator elements prepared for assembly in the housing.
Figure 4.
(a) Stator geometry during the design process and (b) rotor geometry during the design process—all dimensions are in millimetres.
Table 2.
Magnetic parameters of this material.
| Parameter name | Value | Unit |
|---|---|---|
| Residual induction | 1.21–1.25 | T |
| Maximum energy product | 38 | MGOe |
| Magnetic coercivity | 907 | kA/m |
| Magnetic energy density | 286–302 | kJ/m3 |
| Maximal temperature | 150 | °C |
Figure 5.
Comparison of simulated and measured back-EMF.
Figure 6.
Motor torque (Nm) vs motor RMS current (A) with relative error and torque constant.
Figure 7.
Motor-run power losses (W) of the tested motor vs motor speed (rpm) during free run (idle losses).
Figure 8.
Efficiency vs output power (in range: 0–10 kW) vs speed (in range: 600–1875 rpm).
Figure 9.
Temperature change in the motor (core and winding) during operation.
Figure 10.
Amplitude spectrum of noise in the range of 0 kHz up to 20 kHz with zoomed frequency below 1.5 kHz.