Inductive pulse generator

• US 4,721,864 A
• Filed: 12/05/1986
• Issued: 01/26/1988
• Est. Priority Date: 12/05/1985
• Status: Expired due to Term

• Current Assignee: Alfred Teves GmbH (ITT Automotive GmbH)
• Original Assignee: Alfred Teves GmbH (ITT Automotive GmbH)
• Inventors: Goossens, Andre
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Ip, Shik Luen Paul
• Application Number:
  US06/938,501
• Time in Patent Office: 417 Days
• Field of Search: 307/106, 307/105, 310/160, 310/152, 310/155, 310/169, 310/170, 310/113, 310/112, 324/160, 324/173, 324/174, 324/179, 324/166, 324/162, 324/163, 324/164, 324/171, 360/110, 360/111, 360/119, 360/112, 360/113, 360/125, 360/122, 360/126, 360/123, 318/138, 318/254, 318/439
• US Class Current: 307/106
• CPC Class Codes: G01P 3/488 delivered by variable reluctance detectors

Abstract

An inductive pulse generator for converting a rotary movement into a frequency proportional therewith. The pulse generator includes a measuring wheel (1) provided with poles (3) of magnetic material evenly distributed over the circumference of the measuring wheel. The pulse generator further includes a stator (4) provided with a magnetic core (6) with plate-shaped pole shoes (10) in a coil carrier (8) out of which end portions (12) of the pole shoes (10) project. The end portions (12) face the measuring wheel (1). A coil (7) surrounds the magnet core (6), at which coil (7) a pulsating voltage can be picked off with a frequency proportional to the number of revolutions of the measuring wheel (1), outside the area of the pole shoe (10) end portions (12) facing the measuring wheel (1). The thickness of the pole shoes (10) is increased by additional magnetic material (11) so as to increase the pulsating voltage which can be picked off at the coil (7).

Claims

1. An inductive pulse generator for converting a rotary movement into a frequency proportional therewith, said pulse generator having a measuring wheel provided with poles of magnetic material evenly distributed over the circumference of said measuring wheel, and said pulse generator having a stator provided with a magnet core with plate-shaped pole shoes in a coil carrier out of which end portions of the pole shoes project, said end portions facing the measuring wheel, and with a coil surrounding the magnet core, at which coil a pulsating voltage can be picked off with a frequency proportional to the number of revolutions of the measuring wheel, wherein outside the area of the pole shoe (10) end portions (12) facing the measuring wheel (1), the thickness of the pole shoes (10) is increased by a predetermined amount of additional magnetic material.

2. A pulse generator as claimed in claim 1, wherein the additional magnetic material is provided in the form of strips (11).

3. A pulse generator as claimed in claim 2, wherein the strips (11) rest against the respective adjoining pole shoe (10).

4. A pulse generator as claimed in claim 3, wherein a covering plate (14) of non-magnetic material is arranged between the measuring wheel (1) and the pole shoe (10) ends facing the measuring wheel(1).