Angular position sensor and angular position determination means

Details Angular position sensor and angular position determination means Angular position sensor and angular position determination means

1987-06-26

1989-09-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

310168, 318653, 34087031, 901 46, G01B 730, G08C 1906, B25J 1902

Patent

active

048703583

ABSTRACT:
An angular position sensor for determining the relative angular position of two relatively rotatable ferromagnetic coaxial components, such as a rotor and stator. The components have the same number of regularly distributed teeth and the teeth in one component are separated by an air gap from the teeth in the other component. A plurality of coils are connected in series with each other and are disposed around the teeth in one of the components and correspond in number to the number of associated teeth. An electric excitation signal having a measurable constant electrical characteristic is fed to the plurality of coils from a source. The characteristic is modulatable in response to variations in the magnetic reluctance of the air gap effected by changes in the relative angular position between the two components. Electronic circuitry is connected to coils for measuring the modulation of the characteristics to determine the relative angular position of the components. In angular position determination apparatus comprising a plurality of angular position sensors, mechanical connections are provided between the rotors on the one hand and the stators on the other. The angular displacement between the rotor and stator teeth differs for each sensor, the difference generally being a multiple of the quotient of 2.pi. by the number of teeth and the number of sensors. The sensor is well adapted for use in the robotics field.

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