Title:
D.C.GENERATOR TYPE NON-CONTACT SPEED SENSING DEVICE
Document Type and Number:
WIPO Patent Application WO/1982/001074
Kind Code:
A1
Abstract:
In a D.C. generator type non-contact speed sensing device including a cylindrical permanent magnet rotor (1) with N and S poles alternating around its periphery, a stator (2) with output windings (4) wound thereon confronting the rotor (1), a position-sensing permanent magnet (3) rotating coaxially with the rotor (1), magnetic sensing switches (5) arranged in the vicinity of the periphery of the position-sensing magnet, and the flat portion of a multi-phase A.C. trapezoidal wave form being sampled by the switching operation of the switches (5) in response to the rotating position of the position-sensing magnet (3) so as to produce a D.C. voltage proportional to the rotating speed, the S-pole region and the N-pole region in the position-sensing magnet (3) are continuously formed such that the resultant magnetic field is sharply inverted from one polarity to the other polarity and the ratio of the width of the S-pole region to that of the N-pole region is determined by other than (1) such that the switches (5) samples only the flat-portion of the multi-phase A.C. trapezoidal waveform induced in the output windings, without being influenced by changes in the operational level of the switches, so as to obtain a D.C. voltage with no ripple.
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Inventors:
AMEMIYA YOICHI (JP)
KOZAI YOSHINORI (JP)
IWAMATSU NOBORU (JP)
KOZAI YOSHINORI (JP)
IWAMATSU NOBORU (JP)
Application Number:
PCT/JP1981/000234
Publication Date:
April 01, 1982
Filing Date:
September 17, 1981
Export Citation:
Assignee:
FUJITSU FANUC LTD (JP)
AMEMIYA YOICHI (JP)
KOZAI YOSHINORI (JP)
IWAMATSU NOBORU (JP)
AMEMIYA YOICHI (JP)
KOZAI YOSHINORI (JP)
IWAMATSU NOBORU (JP)
International Classes:
G01P3/46; G01P3/487; H02K29/06; H02K29/14; H02K29/08; (IPC1-7): G01P3/44; G01P3/46; G01P3/48; H02K29/02
Foreign References:
| JPS50115073A | 1975-09-09 | |||
| JPS53106179A | 1978-09-14 | |||
| US3903462A | 1975-09-02 | |||
| GB913170A | 1962-12-19 | |||
| JPS5614951A | 1981-02-13 | |||
| JPS5124844U | 1976-02-24 | |||
| JPS5046154U | 1975-05-08 | |||
| JPS51130809A | 1976-11-13 | |||
| JPS55122465A | 1980-09-20 | |||
| JPS4945882B1 | 1974-12-06 |
Other References:
See also references of EP 0059763A4
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