Research Article
Design and Analysis of a Novel Speed-Changing Wheel Hub with an Integrated Electric Motor for Electric Bicycles
Table 3
Rated conditions, magnet’s material properties, and design results for an exterior-rotor BLDC hub motor.
| | Items | Symbol | Values |
| | Rated conditions | | Rated power (W) | | 350 | | Rated speed (rpm) | | 300 |
| | Magnet’s material properties (NdFeB BNP12) | | Remanence (T) | | 0.76 | | Relative permeability | | 1.26 | | Coercivity (A/m) | | −480000 | | Direction of magnetization | — | Parallel | | Magnet thickness (mm) | | 2 | | Magnet arc (degree) | | 27 |
| | Design results | | Number of phases | | 3 | | Number of magnet poles | P | 12 | | Number of armature slots | S | 18 | | Air-gap length (mm) | g | 0.5 | | Slot opening (mm) | | 2.6 | | Inner radius of rotor (mm) | Rri | 50.5 | | Outer radius of rotor (mm) | | 60 | | Inner radius of stator (mm) | | 20 | | Outer radius of stator (mm) | | 50 | | Tooth width of stator (mm) | | 7 | | Shoe depth (mm) | | 2 | | Shoe ramp (degree) | | 0 | | Number of coils per armature tooth (turn) | | 54 | | Stack length (mm) | L | 80 | | Rated phase current (A) | | 8.3 |
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