SELF-COMPENSATING TACHOMETER GENERATOR

• US 3,564,313 A
• Filed: 08/08/1969
• Issued: 02/16/1971
• Est. Priority Date: 08/08/1969
• Status: Expired due to Term

• Current Assignee: Goor Dan
• Original Assignee: Goor Dan
• Inventors: GOOR DAN
• Application Number:
  US04/848,465
• Time in Patent Office: 557 Days
• US Class Current: 310/168
• CPC Class Codes: G01P 3/488 delivered by variable reluctance detectors

Abstract

A tachometer generator has rotor and stator pole pieces which interfit as they move relative to one another so as to provide at least a pair of relatively low reluctance stator-rotor flux paths parallel to the axis of rotation of the rotor.

Claims

1. A tachometer generator comprising:

A. a rotor;

1. made of material having a high magnetic permeability;

2. mounted for rotation about an axis; and

3. a plurality of pole pieces arranged about said axis; and

B. a stator including;

1. a permanent magnet;

2. a stator pole piece positioned opposite the rotor radially outward from the axis thereof, either the rotor pole pieces or the stator pole piece having radial passages for receiving the opposite member so that the rotor and stator pole pieces interfit as they move relative to one another, thereby providing relatively short rotor-stator flux paths generally parallel to the axis so that relatively large changes in the rotor-stator flux from said magnet occur in response to rotation of the rotor; and

3. a winding associated with the stator pole piece and arranged to develop a voltage in response to said flux changes.

2. A tachometer generator as defined in claim 1 wherein each stator pole piece has a notch at its end through which the rotor pole pieces pass as the rotor turns.

3. a plurality of pole pieces arranged about said axis;

and B. a stator including;