DC brushless motor

Claim 2

A DC brushless motor comprising: a rotor having magnetic poles of opposite polarities thereof; a stator member having one pair of flux-producing windings positioned in torque-producing relation with said rotor, each of said windings having a conductor extended in parallel with a direction of the rotation axis of said rotor, and respective windings being arranged in a spaced relation to one another by substantially 90*; a pair of magnetic conversion means positioned in flux-sensing relationship to said magnetic poles; and driving control means having a single pair of driving circuits for applying a flux-producing current to respective ones of said windings, each of said driving circuits including two symmetrically disposed transistor circuits, each comprising a first transistor having its input terminal coupled tO a different one of the output terminals of one of said magnetic conversion means and a second transistor having its output terminal coupled to a terminal of one of said windings, and means for interconnecting an output terminal of said first transistor in one of said transistor circuits with an input terminal of said second transistor in the other one of said transistor circuits, so that said flux-producing current selectively flows through one of the two windings every 90* as said rotor rotates and the direction of said current is reversed every 180* as said rotor rotates, thereby torque is produced to continuously rotate said rotor unidirectionally.

Claim 3

A DC brushless motor according to claim 1, said driving control means further comprising speed control means, said means including means for detecting the speed of revolution of said rotor, means for producing a reference signal, and comparator means for comparing outputs from said detecting means and reference signal producing means.

Claim 4

A DC brushless motor according to claim 1, wherein said magnetic conversion means comprising; a pair of Hall generators positioned in fixed relation to said rotor with an angular displacement from each other corresponding to an electrical displacement between said rotor magnetic poles of 90*.

Claim 5

A DC motor according to claim 3, wherein said Hall generators are connected to a power supply source through rotor speed controlling means so as to control the magnitude of the output signal from the respective Hall generators.

Claim 6

A DC motor according to claim 3, wherein said Hall generators are connected to a power supply source through speed control means so as to control the magnitude of the output signal from the respective Hall generators.

Claim 7

An electric motor energizable from a source of uni-direction potential, comprising; a rotor having magnetic poles of mutually opposite polarities thereon; a single pair of flux-producing windings positioned in torque-producing relation with said rotor; a pair of signal generators positioned in flux-sensing relationship to said magnetic poles; means for controlling the speed of said rotor including a controlling circuit arranged to apply output signal magnitude control power to said signal generators which are energized thereby; and driving control means having a single pair of bridge-type driving circuits for applying an exciting current to respective said windings, each of said bridge-type driving circuits each including two symmetrically disposed transistor circuits, each comprising a first transistor having its input terminal coupled to a different one of the output terminals of one of said magnetic conversion means and a second transistor having its output terminal coupled to a terminal of one of said windings, and means for interconnecting an output terminal of said first transistor in one of said transistor circuits with an input terminal of said second transistor in the other one of said transistor circuits, so that said flux-producing current selectively flows through one of the two windings every 90* as said rotor rotates and the direction of said current being reversed every 180* as said rotor rotates, whereby torque is produced to continuously rotate said rotor unidirectionally.

Claim 8

An electric motor energizable from a source of uni-direction potential, comprising; a rotor having magnetic poles of mutually opposite polarities thereon; a single pair of flux-producing windings positioned in torque-producing relation with said rotor; a pair of signal generators positioned in flux-sensing relationship to said magnetic poles; means for controlling the speed of said rotor including a controlling circuit arranged to apply output signal magnitude control power to said signal generators which are energized thereby; and driving control means having a single pair of bridge-type driving circuits for applying an exciting current to respective said windings, each of said bridge-type driving circuits each including two symmetrically disposed transistor circuits, each comprising a first transistor having its input terminal coupled to a different one of the output terminals of one of said magnetic conversion means and a second transistor having its output terminal coupled to a terminal of one of said windings, and means for interconnecting an output terminal of said first transistor in one of said transistor circuits with an input terminal of said second transistor in the other one of said transistor circuits, so that said flux-producing current selectively flows through one of the two windings every 90* as said rotor rotates and the direction of said current being reversed every 180* as said rotor rotates, whereby torque is produced to continuously rotate said rotor unidirectionally.

Claim 9

An electric motor according to claim 6, wherein said speed control means includes a tacho-generator connected to detect the speed of revolution of said rotor, means for producing a reference signal, and comparator means for comparing outputs from said tacho-generator and said reference signal producing means.