US 4,302,692 A · Rotational speed signal sensor

Abstract

A rotational speed signal sensor for a motor having a rotating permanent magnet as a rotor. One cylindrical surface of a hollow cylindrical rotating magnet has a series of magnetic poles which coact with the stator windings so as to produce the torque while the other cylindrical surface of the rotating magnet has a series of magnetic poles which coact with a sensor coil so as to derive the rotational speed signal.

Claims13

Dependent claims

A rotational speed signal sensor, comprising:

(a) an annular rotating magnet whose one cylindrical surface has a first series of a number of n magnetic poles equiangularly spaced apart in the circumferential direction and whose other cylindrical surface has a second series of a number of m magnetic poles equiangularly spaced apart from each other in the circumferential direction, where m>n,
(b) a stator having stator windings which are securely held in position in opposed relationship with said first magnetic pole series of said rotating magnet so as to deliver a rotating force thereto,
(c) a sensor coil having sensing windings which are located at angular positions corresponding to the pitch of said second magnetic pole series and which are interconnected in a zig-zag form, and
(d) a supporting member for supporting said sensor coil in the form of a ring in such a way that said sensor coil may be in opposed relationship with said second magnetic pole series of said rotating magnet and radially spaced apart by a predetermined distance therefrom,
whereby said first magnet pole series may coact with said stator so as to generate the rotating force while said second magnetic pole series may coact with said sensor coil, which is maintained in the form of a ring, so as to derive the rotational speed signal.

2 more elements

A rotational speed signal sensor characterized by comprising

(a) a cylindrical rotating magnet whose one cylindrical surface has a first series of a number of n magnetic poles spaced apart equiangularly from each other in the circumferential direction and whose the other cylindrical peripheral surface has a second series of a number of m magnetic poles, where m>n, which are equiangularly spaced apart from each other in the circumferential direction,
(b) a stator having windings which are disposed in opposed relationship with said first magnetic pole series of said rotating magnet so as to deliver the rotating force to it,
(c) a sensor coil having sensor windings which are located at angular positions corresponding to the pitch of said second magnetic pole series of said rotating magnet and are electrically interconnected in a zig-zag form,
(d) a magnetic member which is disposed close to said sensor coil so as to surround said sensor coil from the exterior, and a supporting member for supporting said sensor ring in the form of a ring in such a way that said sensor coil may be in opposed relationship with said second magnetic pole series of said rotating magnet and radially spaced apart therefrom by a predetermined distance.

1 more element

A rotational speed signal sensor characterized by comprising

(a) an annular rotating magnet whose one cylindrical surface has a first series of a number of n magnet poles which are equiangularly spaced apart from each other in the circumferential direction and whose other cylindrical surface has a second series of a number of m (where m>n) magnetic poles which are equiangularly spaced apart from each other in a circumferential direction,
(b) a stator having windings which are disposed in opposed relationship with said first magnetic pole series of said rotating magnet so as to coact with said first magnetic pole series to deliver the rotating force to said rotating magnet,
(c) a sensor coil having sensor winding elements which are located at angular positions corresponding to the pitch of said second magnetic pole series,
(d) a supporting member for supporting said sensor coil in such a way that said sensor coil may be maintained in the form of a ring which is in opposed relationship with said second magnetic pole series of said rotating magnet and radially spaced apart therefrom by a predetermined distance,
(e) said first magnetic pole series of said rotating magnet coacting with said stator so as to cause the rotation of said rotating magnet and said second magnetic pole series of said rotating magnet coacting with said sensor coil so as to generate a signal corresponding to the rotational speed of said rotating magnet,
(f) said supporting member consisting of an inner ring and an outer ring both of which are made of nonmagnetic materials,
(g) said sensor coil being in the form of a strip and being wrapped around the outer peripheral surface of said inner ring of said supporting member, and
(h) the ends of said strip-shaped sensor coil being extended radially outwardly through slits formed through the wall of said outer ring, maintained in opposed relationship with the side walls of a projection extended out of said outer ring adjacent said slits and soldered to connection pins extended from said outer ring adjacent to said projection thereof.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

06/041,823Filed 23 May 1979

Priority

JP 53-670356 Feb 1978

Granted

24 Nov 1981

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02K 29/14
Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices: with speed sensing devices
H02K 11/0141
Shields associated with stationary parts, e.g. stator cores: shields associated with casings, enclosures or brackets
H02K 11/21
For measuring, monitoring, testing, protecting or switching: devices for sensing speed or position, or actuated thereby
H02K 11/225
Devices for sensing speed or position, or actuated thereby: detecting coils

Abstract

Claims13

Dependent claims

A rotational speed signal sensor, comprising:

(a) an annular rotating magnet whose one cylindrical surface has a first series of a number of n magnetic poles equiangularly spaced apart in the circumferential direction and whose other cylindrical surface has a second series of a number of m magnetic poles equiangularly spaced apart from each other in the circumferential direction, where m>n,
(b) a stator having stator windings which are securely held in position in opposed relationship with said first magnetic pole series of said rotating magnet so as to deliver a rotating force thereto,
(c) a sensor coil having sensing windings which are located at angular positions corresponding to the pitch of said second magnetic pole series and which are interconnected in a zig-zag form, and
(d) a supporting member for supporting said sensor coil in the form of a ring in such a way that said sensor coil may be in opposed relationship with said second magnetic pole series of said rotating magnet and radially spaced apart by a predetermined distance therefrom,
whereby said first magnet pole series may coact with said stator so as to generate the rotating force while said second magnetic pole series may coact with said sensor coil, which is maintained in the form of a ring, so as to derive the rotational speed signal.

2 more elements

A rotational speed signal sensor characterized by comprising

(a) a cylindrical rotating magnet whose one cylindrical surface has a first series of a number of n magnetic poles spaced apart equiangularly from each other in the circumferential direction and whose the other cylindrical peripheral surface has a second series of a number of m magnetic poles, where m>n, which are equiangularly spaced apart from each other in the circumferential direction,
(b) a stator having windings which are disposed in opposed relationship with said first magnetic pole series of said rotating magnet so as to deliver the rotating force to it,
(c) a sensor coil having sensor windings which are located at angular positions corresponding to the pitch of said second magnetic pole series of said rotating magnet and are electrically interconnected in a zig-zag form,
(d) a magnetic member which is disposed close to said sensor coil so as to surround said sensor coil from the exterior, and a supporting member for supporting said sensor ring in the form of a ring in such a way that said sensor coil may be in opposed relationship with said second magnetic pole series of said rotating magnet and radially spaced apart therefrom by a predetermined distance.

1 more element

A rotational speed signal sensor characterized by comprising

(a) an annular rotating magnet whose one cylindrical surface has a first series of a number of n magnet poles which are equiangularly spaced apart from each other in the circumferential direction and whose other cylindrical surface has a second series of a number of m (where m>n) magnetic poles which are equiangularly spaced apart from each other in a circumferential direction,
(b) a stator having windings which are disposed in opposed relationship with said first magnetic pole series of said rotating magnet so as to coact with said first magnetic pole series to deliver the rotating force to said rotating magnet,
(c) a sensor coil having sensor winding elements which are located at angular positions corresponding to the pitch of said second magnetic pole series,
(d) a supporting member for supporting said sensor coil in such a way that said sensor coil may be maintained in the form of a ring which is in opposed relationship with said second magnetic pole series of said rotating magnet and radially spaced apart therefrom by a predetermined distance,
(e) said first magnetic pole series of said rotating magnet coacting with said stator so as to cause the rotation of said rotating magnet and said second magnetic pole series of said rotating magnet coacting with said sensor coil so as to generate a signal corresponding to the rotational speed of said rotating magnet,
(f) said supporting member consisting of an inner ring and an outer ring both of which are made of nonmagnetic materials,
(g) said sensor coil being in the form of a strip and being wrapped around the outer peripheral surface of said inner ring of said supporting member, and
(h) the ends of said strip-shaped sensor coil being extended radially outwardly through slits formed through the wall of said outer ring, maintained in opposed relationship with the side walls of a projection extended out of said outer ring adjacent said slits and soldered to connection pins extended from said outer ring adjacent to said projection thereof.

5 more elements

Dependencies are inferred from the claim text.

Rotational speed signal sensor

Life of this patent

Abstract

Claims13

Rotational speed signal sensor

Life of this patent

Abstract

Claims13