Innovative Low-Cost Sub-Fractional HP BLDC Claw-Pole Machine Design for Fan Applications

Research output: Contribution to journalArticleResearchpeer-review

Abstract

As for mass-produced sub-fractional horsepower drives, non-optimal motor behavior (e.g., high cogging torque, output torque ripple, and noise) is often accepted when cost can be reduced, provided reliability is not compromised. This paper proposes an innovative claw-pole motor design for a low-cost single-phase brushless direct current fan drive, improving motor behavior with no increase to the manufacturing cost: 1) reducing cogging torque by proposing unconventional claw-pole skewing and 2) ensuring self-starting capability by implementing air-gap asymmetry. Both measures help reduce the total output torque ripple. The goal is to reduce fan drive noise, especially at low-speed operation, where cogging torque is often the dominating noise source. The design of stator claw skewing and air-gap asymmetry is presented; their effects on motor quantities are studied via simulations and experiments. With the exception of a small reduction of about 1.8% in the back electromotive force fundamental, skewing the stator claws by 30^{\circ } can reduce the cogging torque by 23% in the simulations and by 28% in the experiments.

Original languageEnglish
Article number8606100
Pages (from-to)2558-2568
Number of pages11
JournalIEEE Transactions on Industry Applications
Volume55
Issue number3
DOIs
Publication statusPublished - 9 Jan 2019

Fingerprint

Machine design
Fans
Poles
Torque
Costs
Stators
Electromotive force
Air
Experiments

Keywords

  • Air-gap asymmetry
  • bifilar winding
  • brushless direct current (BLDC)
  • claw-pole
  • cogging torque
  • fan drives, low-cost
  • skewing
  • sub-fractional horsepower (hp)
  • torque measurement
  • torque ripple

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Fields of Expertise

  • Mobility & Production

Cite this

Innovative Low-Cost Sub-Fractional HP BLDC Claw-Pole Machine Design for Fan Applications. / Leitner, Stefan; Grübler, Hannes; Muetze, Annette.

In: IEEE Transactions on Industry Applications, Vol. 55, No. 3, 8606100, 09.01.2019, p. 2558-2568.

Research output: Contribution to journalArticleResearchpeer-review

@article{20531ca577d349e59bd9687691de9bee,
title = "Innovative Low-Cost Sub-Fractional HP BLDC Claw-Pole Machine Design for Fan Applications",
abstract = "As for mass-produced sub-fractional horsepower drives, non-optimal motor behavior (e.g., high cogging torque, output torque ripple, and noise) is often accepted when cost can be reduced, provided reliability is not compromised. This paper proposes an innovative claw-pole motor design for a low-cost single-phase brushless direct current fan drive, improving motor behavior with no increase to the manufacturing cost: 1) reducing cogging torque by proposing unconventional claw-pole skewing and 2) ensuring self-starting capability by implementing air-gap asymmetry. Both measures help reduce the total output torque ripple. The goal is to reduce fan drive noise, especially at low-speed operation, where cogging torque is often the dominating noise source. The design of stator claw skewing and air-gap asymmetry is presented; their effects on motor quantities are studied via simulations and experiments. With the exception of a small reduction of about 1.8{\%} in the back electromotive force fundamental, skewing the stator claws by 30^{\circ } can reduce the cogging torque by 23{\%} in the simulations and by 28{\%} in the experiments.",
keywords = "Air-gap asymmetry, bifilar winding, brushless direct current (BLDC), claw-pole, cogging torque, fan drives, low-cost, skewing, sub-fractional horsepower (hp), torque measurement, torque ripple",
author = "Stefan Leitner and Hannes Gr{\"u}bler and Annette Muetze",
year = "2019",
month = "1",
day = "9",
doi = "10.1109/TIA.2019.2892023",
language = "English",
volume = "55",
pages = "2558--2568",
journal = "IEEE Transactions on Industry Applications",
issn = "0093-9994",
publisher = "Institute of Electrical and Electronics Engineers",
number = "3",

}

TY - JOUR

T1 - Innovative Low-Cost Sub-Fractional HP BLDC Claw-Pole Machine Design for Fan Applications

AU - Leitner, Stefan

AU - Grübler, Hannes

AU - Muetze, Annette

PY - 2019/1/9

Y1 - 2019/1/9

N2 - As for mass-produced sub-fractional horsepower drives, non-optimal motor behavior (e.g., high cogging torque, output torque ripple, and noise) is often accepted when cost can be reduced, provided reliability is not compromised. This paper proposes an innovative claw-pole motor design for a low-cost single-phase brushless direct current fan drive, improving motor behavior with no increase to the manufacturing cost: 1) reducing cogging torque by proposing unconventional claw-pole skewing and 2) ensuring self-starting capability by implementing air-gap asymmetry. Both measures help reduce the total output torque ripple. The goal is to reduce fan drive noise, especially at low-speed operation, where cogging torque is often the dominating noise source. The design of stator claw skewing and air-gap asymmetry is presented; their effects on motor quantities are studied via simulations and experiments. With the exception of a small reduction of about 1.8% in the back electromotive force fundamental, skewing the stator claws by 30^{\circ } can reduce the cogging torque by 23% in the simulations and by 28% in the experiments.

AB - As for mass-produced sub-fractional horsepower drives, non-optimal motor behavior (e.g., high cogging torque, output torque ripple, and noise) is often accepted when cost can be reduced, provided reliability is not compromised. This paper proposes an innovative claw-pole motor design for a low-cost single-phase brushless direct current fan drive, improving motor behavior with no increase to the manufacturing cost: 1) reducing cogging torque by proposing unconventional claw-pole skewing and 2) ensuring self-starting capability by implementing air-gap asymmetry. Both measures help reduce the total output torque ripple. The goal is to reduce fan drive noise, especially at low-speed operation, where cogging torque is often the dominating noise source. The design of stator claw skewing and air-gap asymmetry is presented; their effects on motor quantities are studied via simulations and experiments. With the exception of a small reduction of about 1.8% in the back electromotive force fundamental, skewing the stator claws by 30^{\circ } can reduce the cogging torque by 23% in the simulations and by 28% in the experiments.

KW - Air-gap asymmetry

KW - bifilar winding

KW - brushless direct current (BLDC)

KW - claw-pole

KW - cogging torque

KW - fan drives, low-cost

KW - skewing

KW - sub-fractional horsepower (hp)

KW - torque measurement

KW - torque ripple

UR - http://www.scopus.com/inward/record.url?scp=85064987608&partnerID=8YFLogxK

U2 - 10.1109/TIA.2019.2892023

DO - 10.1109/TIA.2019.2892023

M3 - Article

VL - 55

SP - 2558

EP - 2568

JO - IEEE Transactions on Industry Applications

JF - IEEE Transactions on Industry Applications

SN - 0093-9994

IS - 3

M1 - 8606100

ER -