English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The capability of new 9-slot 8-pole permanent magnet BLDC motor to start without position sensor is investigated in this paper. The permanent magnet rotor influences the stator windings inductance as the rotor position changes. It leads to variation of motor current. Sensorless control of BLDC motor usually uses back EMF method, but this method cannot be used from standstill, since there is no back EMF. To start this motor smoothly from standstill, the rotor position can be estimated using inductance variation method by injecting high frequency low current to the stator windings. The new 9-slot 8-pole PM BLDC motor has the advantage of its asymmetrical windings. It generates unique current responses when injected by sinusoidal high frequency current on different rotor positions. The current responses then can be separated by fuzzy logic algorithm to determine the rotor position. The experimental results of the estimated rotor position sector with the experimental system are shown in this paper. From these results, the sensorless starting using inductance variation method is applicable to the 9-slot 8-pole motor.

Experimental Investigation on Sensorless Starting Capability of New 9-Slot 8-Pole PM BLDC Motor