Bearingless permanent magnet slice motor(BPMSM)adopts Hall sensors with a 鈥渄ual-use鈥?function

simultaneously identifying rotor position and displacement

which helps reduce motor volume. However

Hall asymmetry adversely affects the suspension performance of the motor. To address this issue

a mathematical model was improved that accounts for Hall asymmetry

resolving the insufficient description of its effects in traditional models. On this basis

the system transfer function was reconstructed

and through pole placement analysis

the stability boundary of PID parameters under different disturbance levels was investigated. When the asymmetry exceeds the critical threshold

a single set of PID parameters can no longer guarantee system

stability. Experimental results demonstrate that when the asymmetry degree

A

5

the optimized PID parameters reduce the peak-to-peak radial displacement fluctuation from 80 渭m to 40 渭m

significantly improving suspension performance. When

A

鈮?

even with optimized PID parameters

the system still exhibits sustained oscillation

with displacement fluctuation deteriorating from 50 渭m to 180 渭m

which fully confirms the accuracy and effectiveness of the proposed research.