Device for Measuring Strength of Permanent Magnet Stepper Motor Rotor
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
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.