Browse Prior Art Database

Device for Measuring Strength of Permanent Magnet Stepper Motor Rotor

IP.com Disclosure Number: IPCOM000043017D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Krimm, DL: AUTHOR

Abstract

A permanent magnet stepper motor rotor 1 is formed of pairs of poles of opposite polarity. A multiturn transducer 2, which comprises a plastic support 3 having a peripheral groove in its edge within which is disposed a plurality of turns of a thin wire 4, is disposed with one end at a selected distance from the rotor 1 to form an air gap 5 therebetween. One end of the wire 4 is connected by a wire 6 to a voltmeter 7, and the other end of the wire 4 is connected by a wire 8 to the voltmeter 7. It is essential that the back end of the transducer 2 (opposite the air gap 5) is located outside the field of the rotor 1 to prevent attenuation of the desired signal which is generated at the front end of the transducer 2. The voltmeter 7 is an AC voltmeter measuring the RMS voltage.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Device for Measuring Strength of Permanent Magnet Stepper Motor Rotor

A permanent magnet stepper motor rotor 1 is formed of pairs of poles of opposite polarity. A multiturn transducer 2, which comprises a plastic support 3 having a peripheral groove in its edge within which is disposed a plurality of turns of a thin wire 4, is disposed with one end at a selected distance from the rotor 1 to form an air gap 5 therebetween. One end of the wire 4 is connected by a wire 6 to a voltmeter 7, and the other end of the wire 4 is connected by a wire 8 to the voltmeter 7. It is essential that the back end of the transducer 2 (opposite the air gap 5) is located outside the field of the rotor 1 to prevent attenuation of the desired signal which is generated at the front end of the transducer 2. The voltmeter 7 is an AC voltmeter measuring the RMS voltage. By rotating the rotor 1 at a selected velocity, the measurement of the RMS voltage will indicate if the rotor 1 is satisfactory because the RMS voltage is directly proportional to the RMS flux density around the rotor 1 when the velocity is fixed and the number of turns of the wire 4 and its length are known.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]