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GPC Y ASOCIADOS S.A.

Veléz Sarsfield 201640 Martinez

Buenos Aires

Tel.: +54 (9) 11 5993 8719

info@gpcasoc.com.ar

https://gpcasoc.com.ar/

Horne Technologies cc

PO Box 536

Betty's Bay, 7141

Tel.: +27 (0)76 563 2084

info@hornet.cc

www.hornetechnologies.co.za

Building of FAULHABER MINIMOTOR SA, Croglio, Switzerland

FAULHABER MINIMOTOR SA

Zona Artigianale 8, Madonna del Piano

6980 Croglio

Tel.: +41 (0)91 611 31 00

info@faulhaber.ch

Building of FAULHABER MICROMO LLC, Wien, Austria

FAULHABER MICROMO LLC

14881 Evergreen Avenue

Clearwater, FL 33762-3008

Tel.: +1 (727) 572 0131

marketing@micromo.com

www.faulhaberUSA.com

NRC Engineering & Precision Drives Co., Ltd.

17F., No. 890, Jingguo Rd., Luzhu Dist.

Taoyuan City 33858, Taiwan, R.O.C.

Tel.: +886 (0) 3-316-1838

info@nrc.com.tw

www.nrc-precidrives.com

EDEL Teknoloji Sistemleri Sanayi ve Ticaret Ltd.Şti

Folkart TowersAdalet Mah.Manas Blv. No:47B/2809

35530 Bayraklı/İzmir

Tel.: + 90 232 215 08 91

info@edelteknoloji.com

www.edelteknoloji.com

Building of FAULHABER Asia Pacific Pte Ltd., Singapore

FAULHABER Asia Pacific Pte Ltd.

Blk 67 Ubi Road 1, #06-07 Oxley Bizhub

Singapore 408730

Tel.: +65 6562 8270

info@faulhaber.com.sg

Compotech Provider AP

Gustavslundsvägen 145, 4 tr

167 51 Bromma

Tel.: +46 (0) 8 441 58 00

info@compotech.se

www.compotech.se

MICROPRIVOD Ltd.

56 (bldg. 32), Shosse Enthusiastov

111123 Moscow

Tel.: +7 495 2214 052

info@microprivod.ru

www.microprivod.ru

Building of FAULHABER Polska sp. z o.o., Poznan, Poland

FAULHABER Polska sp. z o.o.

Ul. Górki 7

60-204 Poznan

Tel.: +48 61 278 72 53

info@faulhaber.pl

FAULHABER Malaysia Sdn Bhd

1A-2-01 & 02 · One Precinct · Lengkok Mayang Pasir

11950 Bayan Baru · Penang · Malaysia

Tel.: +60 4 619 2570

info@faulhaber.my

Swiss Amiet Co., Ltd.

W-903, SK V1 Center, 11 Dangsan-ro 41-g

Yeongdeungpo-gu,07217, Seoul

Tel.: +82 (0) 2 783 4774

info@swissamiet.com

www.swissamiet.com

Shinkoh Electronics Co., Ltd.

Tokyo Sales Office, Motor Sales Division8F, REID-C OMORI building, 6-20-8

Minami-oi, Shinagawa-ku, Tokyo 140-0013

Tel.: +81 (0) 3 6404 1003

motor-info@shinkoh-elecs.co.jp

www.shinkoh-faulhaber.jp

Building of FAULHABER Italia S.r.l., Lomazzo, Italy

FAULHABER Italia S.r.l.

Via Cavour 2

22074 Lomazzo CO

Tel.: +39 0236714708

info@faulhaber-italia.it

Inteltek Automation JV

S.No. 100/5, Ambegaon

Pune - 411046

Tel.: +91 (0) 20 39392150

info@inteltekindia.com

www.inteltekindia.com

Lewenstein Technologies Ltd.

1 Ha'arava St. Givat Shmuel

5400804 Israel

Tel.: +972 3 9780 800

info@l-tech.co.il

www.l-tech.co.il

Electro Mechanical Systems Ltd.

Eros House, Calleva Industrial Park, Aldermaston

Reading, RG7 8LN

Tel.: +44 (0) 118 9817 391

info@ems-ltd.com

www.ems-limited.co.uk

Building of FAULHABER France SAS, Montigny-le-Bretonneux, France

FAULHABER France SAS

Parc d’activités du Pas du Lac2, Rue Michaël Faraday

78180 Montigny-le-Bretonneux

Tel.: +33 (0) 1 30 80 45 00

info@faulhaber-france.fr

www.faulhaber.com

ELMEQ Motor

Passeig Ferrocarrils Catalans 178

Cornellà de Llobregat 08940 (Barcelona)

Tel.: +34 93 422 70 33

marketing@elmeq.es

www.elmeq.es

MOVETEC OY

Suokalliontie 9

01740 Vantaa

Tel.: +358 (0) 9 5259 230

info@movetec.fi

www.movetec.fi

Routech s.r.o.

Dr. Milady Horákové 185/66

460 06 Liberec

Tel.: +420 489 202 971

info@routech.cz

www.routech.cz

Compower ApS

Marielundvej 29

2730 Herlev

Tel.: +45 (0) 44 92 66 20

info@compower.dk

www.compower.dk

Marte Científica e Instrumentação Industrial Ltda

Av Fco Andrade Ribeiro 430

37540-000 Santa Rita do Sapucai, MG

Tel.: +55 (11) 3411 4500

motores@marte.com.br

www.marte.com.br

Building of FAULHABER Drive System Technology (Taicang) Co., Ltd.,Taicang, China

FAULHABER Drive System Technology (Taicang) Co., Ltd.

Eastern Block, Incubator Building, No. 6 Beijing Road West

Taicang 215400, Jiangsu Province

Tel.: +86 (0) 512 5337 2626

info@faulhaber.cn

Building of FAULHABER Benelux B.V., Eindhoven, Netherlands

FAULHABER Benelux B.V.

High Tech Campus 9

5656 AE Eindhoven

Tel.: +31 (0) 40 85155-40

info@faulhaber.nl

Building of FAULHABER Austria GmbH, Wien, Austria

FAULHABER Austria GmbH

Modecenterstraße 22/C89

1030 Wien

Tel.: +43 1 7963149-0

info@faulhaber-austria.at

ERNTEC Pty. Ltd.

15 Koornang Road

Scoresby, VIC 3179

Tel.: +61 3 9756 4000

Fax: +61 3 9753 4000

sales@erntec.net

www.erntec.net

Building of Dr. Fritz Faulhaber GmbH & Co. KG, Schönaich, Germany

Headquarter

DR. FRITZ FAULHABER GMBH & CO. KG

Faulhaberstraße 1

71101 Schönaich

Tel.: +49 7031 638 0

Fax: +49 7031 638 100

info@faulhaber.de

www.faulhaber.com

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Please contact us with your request at

Info@faulhaber.com

Jan-Christopher Mohr

Area Sales Manager

Tel.: +49 (7031) 638 158

jan-christopher.mohr@faulhaber.de

Michael Schütte

Area Sales Manager

Tel.: +49 (7031) 638 456

michael.schuette@faulhaber.de

Daniel Brönnimann

Area Sales Manager

Tel.: +41 (0) 79 570 0814

daniel.broennimann@faulhaber.ch

Rolf Leitner

Regional Sales Manager

Tel.: +41 (0) 79 422 3348

rolf.leitner@faulhaber.ch

Rafael Steinemann

Area Sales Manager

Tel.: +41 (0) 79 932 1645

rafael.steinemann@faulhaber.ch

Implementation of Redundancy in a Miniature Stepper Motor

Some of the recent research activities in the area of electric motor drives for critical applications (such as aerospace and nuclear power plants) are focused on looking at various fault tolerant motor and drive topologies.

After discussing different solutions, this paper focuses on a miniature PM stepper motor design which falls in this fault tolerant category by providing an increased redundancy.

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Safety critical systems are taking on increasing importance in the industrial world. Some examples of such systems are aerospace, transportation, medical and military applications, and nuclear power plants. These all accommodate a number of electric motor drives installed to a point where the plants rely heavily upon them. Any failure in these drives may cause catastrophic failures in the plants, which may be very costly in term of human resources and capital cost, and clearly undesirable. Techniques behind most of the electric drives on the market today are not adequate for safety-critical applications. Therefore, there is a need to improve the survivability of critical systems given the increasing dependence on them, and the serious consequences of their failure. One of the common tools used in the design of safety critical systems is redundancy. Ideally, many fault-tolerant systems should mirror all operations; that is, every operation should be performed on two or more duplicate systems, so if one fails the other can take over. Therefore, redundancy within the system is an essential aspect.

What is a fault-tolerant motor?

The specifications of a fault tolerant motor include:

  • Higher redundancy, by using identical motor segments on the same shaft.
  • Electrically isolated phases to prevent phase to phase short-circuit.
  • Magnetically uncoupled windings to avoid reduction of performance in the case of a failure of the other phases.
  • Physically isolated phases to prevent propagation of the fault into the neighboring phases and to increase the thermal insulation.

What solutions are offered?

Coupling two motors on the same shaft (Figure 1) is what comes normally to one’s mind first. Although its implementation is straightforward, this solution presents several limitations to be considered:

  • This solution costs roughly twice as much as the nonfault- tolerant system.
  • The driving motor has to overcome the friction torque and cogging of the idle motor while it induces in addition iron losses in the later, reducing the overall efficiency of the system.
  • It brings in unpredictable resonance frequencies which may severely impact the proper running of the system.
  • It does not fulfill at all the requirements of small size and light weight requested by the aero-space industry
FAULHABER Tutorial Stepper motor
Figure 1: Two motors coupled on the same shaft

The existence of FAULHABER Disc Magnet motors simplifies the quest for redundancy capability. By default, this patented motor design features 4 windings which are normally connected by pair to form a Two-Phase stepper motor. A customised solution letting the 4 windings independent from each other creates two Two-Phase PM stepper motors with physically and electrically isolated phases which are the key to achieve a failure free system (Figure 2). The windings are only partially magnetically coupled and the redundant configuration leads to only a torque reduction of 30% when compared to the standard motor configuration at equivalent dissipated power. With proper heat sink and phase current increase, the same output torque can be reached.

Conclusion

The specific and patented design of some existing small miniature motor (down to Ø6mm) meets, with very little adaptation, the specifications for a fault-tolerant, robust, reliable motor with the degree of redundancy which is crucial in safety-critical applications that rely on the failurefree operation of electric motor drives.

FAULHABER Tutorial Stepper motor
Figure 2: FAULHABER Disc Magnet motor with redundant windings

Reference: Fault Tolerant Motor Drive System with Redundancy for Critical Applications N. Ertugrul, W. Soong, G. Dostal and D. Saxon. The University of Adelaide

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