Abstract: A motor includes a rotary shaft, an armature part, a frame including a tubular portion surrounding the armature part, and a plurality of magnets. The tubular portion is formed of a magnetic body. The tubular portion includes a plurality of flat parts and a plurality of curved parts. Each of the plurality of flat parts and each of the plurality of curved parts being alternately arranged in a peripheral direction. On an inner surface of the tubular portion in each of the plurality of curved parts, a plurality of magnetic poles are provided. A magnetic gap is provided in a radial direction, the magnetic gap being formed by the inner surface of the tubular portion in each of the plurality of flat parts and the armature part.

Abstract: An electric power tool includes a motor with a rotor having a permanent magnet; a control unit that sets a control amount of the motor in accordance with operation of an operation portion and that drive-controls the motor based on the control amount; and a number-of-rotations detection unit that detects the number of rotations of the motor. During driving of the motor, when the number of rotations detected by the number-of-rotations detection unit has reached an upper limit number of rotations set in advance, the control unit shifts drive control of the motor to rotation control, in which the control amount is made to be increased or decreased so that the number of rotations of the motor becomes a predetermined target number of rotations.

Abstract: A DC motor comprises: a tubular metal case; a magnet that is provided along the inner surface of the metal case and has four or more of magnet poles in the circumferential direction; an armature that is arranged to face the magnet and composed of a core and a coil; and a shaft. The magnet is formed of a material with a maximum energy product BHmax of 3 to 6 MGOe. When the thickness of the magnet in the radial direction of the armature is indicated by T [mm] and the outer diameter of the core is indicated by d [mm], the ratio T/d of the thickness T of the magnet to the outer diameter d of the core is 0.16 or more.

Abstract: In an electric motor, permanent magnets are disposed on flat sections of a peripheral wall of the yoke, which is formed to be polygonal seen in plan view in the axial direction, a first bearing section which rotatably supports one end of the rotary shaft is integrally formed on a bottom part of the yoke, and a brush holder accommodating section capable of accommodating a brush holder unit that holds the brushes is integrally formed at an opening of the yoke.

Abstract: The side wall of a motor casing is formed into a quadrangular shape such that four flat side portions, and arcuate corner portions located at respective corners are continuously joined together. A field magnet having a quadrangular external shape is formed such that four flat side portions, and four arcuate corner portions located at respective corners are continuously joined together. The arcuate corner portions of the motor casing and the arcuate corner portions of the field magnet extend along respective circles having a center located at the center of a motor shaft, and the central angles of the arcuate corner portions fall within a range of 15° to 35° inclusive. The field magnet is press-fitted or bonded into the motor casing such that the corner portions of the field magnet come into close contact with the corner portions of the motor casing.

Abstract: A motor comprises a stator and a rotor (20) disposed within the stator. The stator comprises a shell comprising a plurality of sidewalls (10a-10d) and arcuate connection parts (11a-11d) connecting neighboring sidewalls. The cross section of the shell is a polygon with fillets. The stator also comprises a plurality of magnets (12a-12d) installed inside the arcuate connection parts. The magnets (12a-12d) are mutual arranged at intervals. The outer surface of each magnet (12a-12d) is attached to inner surfaces of the two neighboring sidewalls (10a-10b) and a gap is formed between the magnet and the inner surface of the corresponding arcuate connection part. Air gaps are formed between the inner surface of the magnets (12a-12d) and the outer surface of the rotor. Disposing the magnets inside the arcuate connection parts improves the space utilization ratio.

Abstract: A flux-focused, shaped permanent magnet includes a body of magnetic material having multiple surface contouring to form a reduced flux side with convex surfaces and an increased flux side with concave surfaces. The surfaces develop high and low resistance external flux paths creating focused asymmetric flux fields. A magnetic unit having the shaped permanent magnet and a magnetic flux attracter or two shaped permanent magnets interconnected by two segmented permanent magnets and a kinetic device having a stationary stator ring, a rotor disc rotating within the stator ring and a multiplicity of the magnetic units on the stator ring and the rotor disc, are also provided.

Abstract: The side wall of a motor casing is formed into a quadrangular shape such that four flat side portions, and arcuate corner portions located at respective corners are continuously joined together. A field magnet having a quadrangular external shape is formed such that four flat side portions, and four arcuate corner portions located at respective corners are continuously joined together. The arcuate corner portions of the motor casing and the arcuate corner portions of the field magnet extend along respective circles having a center located at the center of a motor shaft, and the central angles of the arcuate corner portions fall within a range of 15° to 35° inclusive. The field magnet is press-fitted or bonded into the motor casing such that the corner portions of the field magnet come into close contact with the corner portions of the motor casing.

Abstract: A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.

Abstract: This abstract section is written to explain this patent application. A magnetic motion has been found utilizing the sides and corners of permanent magnets. This motion has been taught at public schools by myself and the magnetic motion at certain angles continues to perform without fail. The intent of this inventor is to continue to develop and teach this magnetic motion and the set-up to achieve this motion. An engine/motor capable of picking up a load, while under a load is the final goal of this effort. This patent is for a magnetic motion, a magnetic motion demonstrator, and a teaching tool itself. Any future engines/motors using this method of magnetic motion will fall under this patent in the fundamental's area only not in the individual improvements of future patents. If allowed, an itemized list of non-patent-able fundamentals/techniques will be included.

Abstract: A rotation detector includes a rotor having a shaft. Projections are located at predetermined intervals on the periphery of the rotor and extend in an axial direction. Magnets are located between the projections and the shaft. The flux of each magnet is detected by a corresponding magnetism detection element. Each magnetism detection element has magnetic resistors. Movement of the projections changes the direction of flux of the magnets. Each resistor is switched between a first state, in which its magnetic resistance is great, and a second state, in which its magnetic resistance is small, in accordance with the change of the flux direction. The resistors are divided into two groups. The groups are substantially symmetrical relative to a centerline of the groups such that, when the direction of the flux changes, the resistors in one group are in the opposite state from the resistors in the other group. The centerline of changes in the direction of the flux matches the centerline of the resistor groups.