DEVIATION DETECTING APPARATUS

• US 3,771,085 A
• Filed: 08/02/1972
• Issued: 11/06/1973
• Est. Priority Date: 08/10/1971
• Status: Expired due to Term

• Current Assignee: Shin-Ichi Kawada, Takeshi Hojo
• Original Assignee: Shin-Ichi Kawada, Takeshi Hojo
• Inventors: Hojo, Takeshi, Kawada, Shin-Ichi
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US05/277,399
• Time in Patent Office: 461 Days
• Field of Search: 336/115,116,121,122,123,124,125,126,30,180,182
• US Class Current: 336/182
• CPC Class Codes: G01C 19/28 Pick-offs, i.e. devices for taking-off an indication of the displacement of the rotor axis
• CPC Class Codes: G01C 19/38 with north-seeking action by other than magnetic means, e.g. gyrocompasses using earth's rotation
• CPC Class Codes: G01D 5/225 by influencing the mutual induction between the two coils
• CPC Class Codes: H01F 2029/143 with control winding for generating magnetic bias
• CPC Class Codes: H01F 29/12 having movable coil, winding, or part thereof; having movable shield

Abstract

A deviation detecting apparatus having a primary coil for generating an alternating magnetic field, and a secondary voltage inducing device disposed to oppose said primary coil with a space therebetween and producing a secondary voltage in accordance with the alternating magnetic field caused by said primary coil. In this case, said secondary voltage inducing device consists of four secondary coils, said four secondary coils being arranged in square and made up by winding two electrically insulated wires in parallel, the two first wires of the adjacent two secondary coils being connected to deliver as an output a sum or difference of induced voltages therein and to form two pairs of winding groups each of said two pairs of winding groups being connected to deliver as an output a sum or difference of induced voltages therein, the two adjacent second wires being connected to deliver as an output a sum or difference of induced voltages therein and to form two pairs of winding groups in a different manner to that in said first wires, said pairs of winding groups being connected in such a manner that a sum or difference of induced voltages therein is delivered as an output.

Claims

1. A deviation detecting apparatus comprising a primary coil for generating an alternating magnetic field, and a secondary voltage inducting device disposed to oppose said primary coil with a space therebetween and producing an induced secondary voltage in accordance with the alternating magnetic field caused by said primary coil, characterized in that said secondary voltage inducing device consists of four secondary coils, said four secondary coils being arranged in a plane in the form of a square and each of said four secondary coils being made up by winding two electrically insulated wires in parallel, the two first wires of adjacent two secondary coils of said four secondary coils being connected to deliver an output which is the sum of voltages induced therein and to form two winding groups, said two winding groups being connected to deliver an output which is the difference of voltages induced therein, the two second wires of the other adjacent two secondary coils being connected to deliver an output which is the sum of voltages induced therein and to form two other winding groups, said last mentioned two winding groups being connected to deliver an output which is the difference of voltages induced therein.

2. A deviation detecting apparatus as claimed in claim 1, wherein another coil is provided which surrounds said four secondary coils.