Abstract:
A brushless DC motor minimizes a chance of dislocation of or damage to an insulator used in the brushless DC motor. Slant portions are provided at end portions of the insulator; therefore, even if a nozzle of a machine for installing a winding should hit the insulator while moving between teeth, the insulator moves in a direction for coming in close contact with a slot aperture, i.e., in a direction substantially at right angles to a direction in which the nozzle moves. This arrangement prevents the insulator from moving by being pushed by the nozzle, making it possible to minimize a chance of occurrence of an insulation failure caused by a damaged or dislocated insulator.
Abstract:
A laminated core of a motor in which vibrations of core plates causing motor noise is restrained at a low cost; a method of manufacturing such a laminated core; a motor having such a laminated core; and an ink-jet recording apparatus having such a motor. In a laminated core (1) of a motor in which a plurality of core pieces (10) are laminated on each other and which has magnetic poles (13) each having a roughed surface of mountain portions (13a) and groove portions (13b) formed alternately in the direction of rotation of the motor, welded portions (31) for firmly fixing the core pieces (10) to each other are provided in the surface of one of the groove portions (13b) formed in the vicinities of the central portion of each magnetic pole (13) in the direction of rotation. Each welded portion (31) is formed continuously in the direction of lamination of the core pieces (10). Each welded portion (31) is formed by welding the surface of the groove portion (13b). By these welded portions (31), the core pieces (10) are firmly fixed to each other in the surface portions of the magnetic pole portions (13).
Abstract:
A method for core lamination in a motor and a lamination structure thereof are constructed such that a plurality of lamination sheets which is made by thin plate of a predetermined shape are laminated as a predetermined thickness to form a laminated body, that is, a unit lamination core, and the unit lamination core comprising the plurality of lamination sheets is fixedly coupled by a caulking portion or a coupling portion formed on the respective lamination sheet and connected with the adjacent lamination sheets to be in a row, whereby an fabricating process of the unit lamination core is made to be easy and simple to reduce time for fabricating, and a curvature for a curved surface portion of the unit lamination core can be changed so that the present invention can be applied to various motors according to the capacity or the size of the motor.
Abstract:
A brushless DC motor minimizes a chance of dislocation of or damage to an insulator used in the brushless DC motor. Slant portions are provided at end portions of the insulator; therefore, even if a nozzle of a machine for installing a winding should hit the insulator while moving between teeth, the insulator moves in a direction for coming in close contact with a slot aperture, i.e., in a direction substantially at right angles to a direction in which the nozzle moves. This arrangement prevents the insulator from moving by being pushed by the nozzle, making it possible to minimize a chance of occurrence of an insulation failure caused by a damaged or dislocated insulator.
Abstract:
Rotor for electric motors, in which the laminations of two types and arranged alternately, are made in a manner that a first type is provided with a plurality of protrusions formed by respective protruding tabs, a plurality of perforations being punched in the lamination near the edge of a respective tab with the same orientation pattern thereof so as to create an alternate sequence of tabs and respective perforations, wherein a respective cavity is provided in the respective lamination in correspondence of the tabs of said first type, whereas the second type of laminations is provided with a plurality of different tabs adapted to engage the cavities formed by the association of said recesses corresponding to said first tabs with said respective perforations, wherein the tabs of the second type are produced without any removal of material.
Abstract:
The present invention involves a method and apparatus for forming a centrally interlocked stack of laminations for rotors. A centrally located, circular indentation is formed in each lamination. The indentation provides corresponding projections and depressions in the laminas which may be interlocked by engaging adjacent depressions and projections. Using a progressive die assembly, laminas are blanked from stock sheet material and punched to form the projection/depression. The machine for manufacturing the laminations includes a blanking station including a punch for forming the projections/depressions, and a rotating and stacking station. The projection/depression forming station includes a counterforce which is applied when punching the projection/depression so that the stock material is relatively flat. The laminations are blanked, then rotated, and finally stacked together to form a lamination stack.
Abstract:
A method of manufacturing an elongate stack of interlocked laminae in a die assembly. The method includes the steps of stamping a first lamina having generally opposed first and second edges in the strip stock material, stamping at least one first interlock means for engaging another lamina in the first lamina, separating the first lamina from the strip stock material, placing the first lamina into the choke passageway, the first and second edges of the first lamina frictionally engaging the choke passageway, stamping a second lamina having first and second elongate edges in the strip stock material, stamping at least one second interlock means for engaging another lamina in the second lamina, at least partially engaging the first and second interlocking means, separating the second lamina from the strip stock material, placing the second lamina into the choke passageway, and frictionally engaging the choke passageway along the first and second elongate edges of only one of the first and second laminae.
Abstract:
A motor structure having an armature yoke 1 including a cylindrical portion and a plurality of salient poles 20 formed in the radial direction on the circumference of one end of the cylindrical portion, characterized by having a stator coil 5 formed by a concentrated winding provided around a salient pole portion 20', which is formed by joining the salient poles 20 of two armature yokes 1 together, and a motor structure characterized by having the above described structure and further having a salient pole piece 11 disposed on the front end of the salient pole portion in confronting relationship with a rotor magnet 2.
Abstract:
A rotor (10) includes a plurality of permanent magnets (14) disposed around a shaft (12) at generally equal intervals, and a plurality of laminated core members (16) disposed between the permanent magnets (14) so as to form magnetic poles. The laminated core members (16) are formed by stacking a plurality of core-laminations (26) made of magnetic materials and an integral core-lamination, and joining them to each other. The integral core-lamination includes a plurality of core-lamination sections each having a shape the same as that of the core-lamination (26), and connecting portions (46) for connecting adjacent core-lamination sections with each other. When the large number of core-laminations (26) and the integral core-lamination are integrally joined by a press-fitting process, the laminated core members (16) are connected with each other in such a relative arrangement of a finished assembly that a space for locating the permanent magnet (14) is defined between the adjacent laminated core members (16), and thus an integral laminated rotor core (48) is formed.
Abstract:
An apparatus and method for manufacturing laminated parts from a plurality of laminas, in which the laminas for forming the laminated parts are blanked from strip stock material. The laminas and are then cut and stacked to form the laminated part. The apparatus includes a measuring device, such as a linear variable differential transducer, for measuring the thickness of successive sections of the strip stock. A controller, such as a computer or a programmable logic controller, receives the thickness value of the strip stock sections from the measuring device. The desired stack height is inputted into the controller, as well as a protuberance or dimple height. A punching device, such as one or more front and rear slide operated punches, is also included which is activated by the controller to provide a protuberance at selected locations upon the strip stock sections. Respective air valves and cylinders may operatively connect to each punch to cause the punch to impart a protuberance upon receipt of an appropriate signal from the controller. The location and number of the protuberances within the stack is determined as a function of the desired stack height, the thickness of the strip stock material and the predetermined protuberance height.