| Abstract |
The paper deals with a new electronic method and device for detecting the rotor angular position of the stepping motors with toothed structure of their air gap. The method refers to fitting special capacitors inside the stater slots, whose capacitance varies with the rotor angle. The device contains two capacitive bridges that provide amplitude-modulated output signals, which can be used for yielding either analogical, or incremental information about the rotor movement. Two types of capacitors are studied by an approximate calculus and their performances are indicated. Then the electronic part of the transducer is described and an application to the closed-loop control of a variable-reluctance stepping motor is given. Finally, the advantages and a few practical considerations over capacitive transducer are presented. |
