| Symbol | Parameters | Number |
| nin | Number of pole pairs of internal permanent magnet piece | 4 |
| ns | Number of pole plates of adjustable magnetic ring | 27 |
| nout | Number of pole pairs of external permanent magnet piece | 23 |
| ryin1 | Inner diameter of the inner yoke/mm | 45 |
| rpin1 | Inner diameter of permanent magnet piece of inner ring/mm | 54 |
| rpin2 | External diameter of permanent magnet piece of inner ring/mm | 68 |
| rm1 | Inner diameter of adjustable magnetic ring/mm | 69 |
| rm2 | External diameter of adjustable magnetic ring/mm | 75 |
| rpout1 | Inner diameter of permanent magnet piece of external ring/mm | 76 |
| rpout2 | External diameter of permanent magnet piece of external ring/mm | 82 |
| ryout2 | External diameter of the external yoke/mm | 85 |
| l | Axial size/mm | 40 |