1 Introduction
2 Principle of the Radial Excitation Actuator
2.1 Balancing Principle
2.2 Radial Excitation Principle
2.2.1 Design of the Magnetic Circuit
2.2.2 Self-locking of the Counterweight Disc by Permanent Magnets
Parameter | Value |
---|---|
Magnetic conductivity μ0 (H/m) | 4π×10−7 |
Permanent magnet type | N35 |
Remanence intensity Br (T) | 1.2 |
Magnet radius Rg (mm) | 3 |
Effective pole area Ag (mm2) | 28.3 |
Installation radius of the magnets R (mm) | 54.75 |
Air gap δ2 (mm) | 0.2–2.0 |
Number of permanent magnets K | 4/8/12 |
2.2.3 Principle of Driving by Magnets and Soft-Iron Blocks
2.2.4 Comparison with Traditional Excitation
2.3 Basic Structure
3 Optimized Design
Item | Design Parameters | Value Range |
---|---|---|
Balancing ability | Density of the counterweight block | 8.5 g/cm3 |
Geometry of the counterweight block | ||
Balancing accuracy | Teeth of the excitation ring | 24 |
Step angle | 7.5° | |
Self-locking torque | Air gap δ2 | 0–1.5 mm |
Number of magnets | 4,6,8,10,12 | |
Shape of magnets | ||
Material of magnets | ||
Driving torque | Air gap δ1 | 0–1 mm |
Air gap δ2 | ||
Number of soft-iron blocks | 0,8,16,24 | |
Shape of soft-iron blocks | ||
Material of soft-iron blocks |
3.1 Self-locking Torque
Item | Material properties |
---|---|
Counterweight disc | Aluminum |
Inner excitation ring | Soft iron-DT4C |
Outer excitation ring | Soft iron-DT4C |
Soft-iron blocks | Soft iron-DT4C |
Permanent magnets | N35 |