US 4,047,084 A · Semiconductor motor controlled for energization by a single position sensing element

Abstract

A polyphase motor having a stator with an armature coil for each phase energized from a D. C. source by a semiconductor circuit. In addition to magnet means on the rotor which respond to the polarity caused by the D. C. current flowing across the armature coils, there is a rotating control band on the rotor with a written position indicator thereon. Disposed on the stator at a location where the written signals on the position indicator can be read are position sensing reading means. These reading means are coupled to the semiconductor stator circuit which in turn controls the flow of current from the D. C. source across the armature coils in accordance with the signals read on the control band.

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Claims13

Dependent claims

A semiconductor motor comprising:

a. first, second and third phase armature coils mounted on a stator;
b. a field arranged to face to said armature coils including a plurality of magnetic poles in N and S poles forming said field are arranged one after the other in an equal pitch;
c. a disc member providing at a circumferential portion thereof with first, second and third three-step electromagnetic anisotropic portions;
d. an electromagnetic coil arranged to face said disc member of sensing said electromagnetic anisotropic portions upon a rotation of the motor to cause the inductance of the coil to be varied;
e. an oscillator source connected to said electromagnetic coil for feeding an alternating current to said electromagnetic coil;
f. a dicrimminating circuit connected to said coil for obtaining first, second and third electric signals from said first, second and third electromagnetic anisotropic portions via a variation of the inductance of the electromagnetic coil;
and,
g. an energization control circuit connected to said discrimmination circuit for effecting an energization control via said first, second and third electric signals by conducting semiconductor switching elements seriesconnected to the respective first, second and third aramature coils whereby a rotation control for the motor is achieved by position sensing signals due to an induction.

5 more elements

A semiconductor motor having a rotor and a stator comprising:

a. three-phase armature coils mounted in stages on the stator and magnet poles on the rotor responsive to said coils;
b. control band means having first, second and thrid written position portions thereon, the angular space of the position written portions corresponding substantially to 2/3 of the angular width of a field pole;
c. a position sensing reading device on said stator arranged to face to said control band, in response to the relative rotation of said control band and sensing element, in synchronization with a rotation of the motor;
d. an energization control circuit coupled to and controlled by said reading device for energizing progressively and cyclically each armature coil of the respective phases corresponding to each of said first, second and third position portions of the control band including gating semiconductor switching elements each series-connected to armature coils;
and
e. a memory circuit coupled to said semiconductor switching element for holding a conductive state of a semicondutor switching element which may be conducted by a position sensing signal produced by facing of the sensing reading element to the third control portion when the motor is used for forward rotation or to the first control portion when the motor is used for reversing rotation to thereby suppress a counter rotation due to a position sensing signal produced when said sensing reading element is located at a boundary between the first and third control band portions.

3 more elements

A semiconductor motor having a rotor and a stator comprising:

a. two-phase armature coil mounted in stages on the stator and magnet poles on the rotor responsive to said coil;
b. control band means having first, second, third and fourth written position portions thereon, the angular space of the position written portions corresponding substantially to 1/2 of the angular width of a field pole;
c. a position sensing reading device on said stator arranged to face to said control band, in response to the relative rotation of said control band and sensing element, in synchronization with a rotation of the motor;
d. an energization control circuit coupled to and controlled by said reading device for energizing progressively and cyclically each armature coil of the respective phases corresponding to each of said first, second, third and fourth position portions of the control band including gating semiconductor switching elements each series-connected to armature coils;
and
e. a memory circuit coupled to said semiconductor switching element for holding a conductive state of a semi-conductor switching element which may be conducted by a position sensing signal produced by facing of the sensing reading element to the fourth control portion when the motor is used for forward rotation or to the first control portion when the motor is used for reversing rotation to thereby suppress a counter rotation due to a position sensing signal produced when said sensing reading element is located at a boundary between the first and fourth control band portions.

3 more elements

Dependencies are inferred from the claim text.

Description15,752 words

Summary854 words

#1. Field of the Invention

#This invention relates to a semiconductor motor controlled for energization by a single position sensing element, or reading means, and more particularly, to a semiconductor motor for generating the continuous driving torque by conducting progressively and cyclically the semiconductor switching elements connected in series with the armature coils, through the position sensing signals obtained by a single position sensing element.

#2. Prior Art

Brief description of the drawings19 figures

#FIG. 1 is a circuit diagram of an energization control circuit for energizing a three-phase armature coil motor according to this invention;

#FIG. 2 (a), (b), (c), (d), are explanatory views of a position sensing device employing a photoelectric element;

#FIG. 3 is an expansion view of a field rotor and armature coils of the motor;

Detailed description14,590 words

#The polyphase motor contemplated herein will be described as a three phase motor, the armature coils A, B and C which will be enabled from a D.C. source from terminals 1-1, 1-2, being shown in FIG. 1. The current flow across armature coils A, B, C will be controlled by an optical control band 15 shown in FIGS. 2 (a), (b), (c), (d). FIG. 3 shows a block schematic explanation of a motor embodying this invention having a most simple construction that includes three-pole armatures of salient-pole type and three-phase armature coils. The rotor construction is illustrated in for example FIG. 2 (c).

#Namely, on a support 17, a boss portion 17a is provided, on this boss portion. The armatures and windings having salient poles are shown in FIG. 1 and FIG. 3, i.e., on each of three salient-poles one of the three armature coils (shown as A, B and C in FIG. 1) is mounted respectively. Mounted for rotation within or outside of the armatures, there is a rotor 16 with a field comprising ferrite magnets in which the N and S poles are arranged 180.degree. apart and are turned by a rotating shaft 16-1. This rotating shaft 16-1 is supported on a bearing provided to the boss portion 17a.

#The magnets being a field rotor are fixed on the inside of the soft steel rotor 16. The field magnets 20 are also shown as reference numerals 20-1, 20-2 for N and S poles an expansion plan view of FIG. 3.

Facts

Application

05/547,507Filed 6 Feb 1975

Priority

JA 49-1995921 Feb 1974

Granted

6 Sep 1977

Term ended

6 Sep 1994

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification4 codes

H02P 6/16
Electronic commutators: circuit arrangements for detecting position
H02K 29/06
Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices: with position sensing devices
H02P
Control or regulation of electric motors, electric generators or dynamo-electric converters
H02K
Dynamo-electric machines

Semiconductor motor controlled for energization by a single position sensing element

Life of this patent

Semiconductor motor controlled for energization by a single position sensing element

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims13

Description15,752 words

Drawings

Classification4 codes

Life of this patent

Description15,752 words