Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
  • H02K17/02—Asynchronous induction motors
  • H02K17/12—Asynchronous induction motors for multi-phase current
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
  • H02K17/02—Asynchronous induction motors
  • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
  • H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
  • H02K17/42—Asynchronous induction generators

Definitions

• the present invention relates generally to motors, and more particularly to polyphase induction motors.
• A.C. electrical motors are widely used in commercial, industrial, domestic and other applications where rotating power is required.
• a typical type of this motor is the an A.C. induction motor known commonly as a squirrel cage motor.
• One drawback of the squirrel cage motor however is the size of the motor.
• Another known type of induction motor is the shaded pole motor.
• the shaded pole motor overcomes the size problem by utilizing an aluminum or copper disk as a rotor. More specifically, an electromagnet is powered by alternating current from a generator. The magnet produces a varying flux through the aluminum disk rotor. On e half of the magnet pole is covered with an aluminum plate which causes the disk to rotate
• a problem with the shaded pole motor is that design is not suitable for a practical high efficiency motor. Another problem with the shaded pole motor is that it does not provide necessary high forces.
• a significant object of the present invention is to provide an induction motor having a rotor disk.
• Another object of the present invention is to provide an induction motor that is efficient and provides high forces.
• Another object of the present invention is to provide an induction motor that is easily manufactured.
• a polyphase induction motor has two electromagnet arrangements, each of the electromagnet arrangements having pole pieces with corresponding polar faces.
• the two electromagnet arrangements are arranged such that the polar faces of the two electromagnet arrangements are in a mirrored facing relationship each other.
• a gap is therefore defined between the facing polar faces of the electromagnet arrangements.
• a substantially planar ferromagnetic conductor plate is disposed within the gap, and rotates about the central axis of the motor.
• a feature of the present invention is to provide an induction motor that is brushless and does not use permanent magnets.
• Another feature of the present invention is to provide an. induction motor that is easily manufactured.
• Another feature of the present invention is that the motor provides high forces. Another object of the present invention is that the motor design may be used as a generator or alternator by simply changing the electrical system driver.
• Figure 1 is a side cross-sectional view of one embodiment of the induction motor of the present invention.
• Figure 2 is a top cross-sectional view of an embodiment of the induction motor shown in Figure 1 ;
• Figure 3 is a side view of one of the electromagnets of the induction motor of the present invention.
• Figure 4 is an electromagnet configuration for an alternative embodiment of the induction motor.
• Figure 5 is an electromagnet configuration for a second alternative embodiment of the induction motor.
• the motor includes an upper electromagnet arrangements 12, a lower electromagnet arrangement 14, and a conductor rotor 16 made of ferromagnetic material.
• the upper electromagnet arrangement and the lower electromagnet arrangement are disposed in a mirrored, symmetrical relationship to each other, with the conductor rotor disposed intermediate the two arrangements.
• each of the arrangements include eight electromagnets 18. Other quantities of electromagnets may be used however, for certain applications, it is preferable to use electromagnets in integral multiples of four.
• the electromagnets are comprised of cores 20 and coils 28.
• One of the electromagnet cores 20 is best shown in Figure 3.
• the electromagnet 20 preferably includes an aperture 22 in the center of the core and is preferably laminated.
• Each of the electromagnets has a first pole piece 24 and a second pole piece 26.
• the electromagnets further define polar faces 27. The polar faces may have a trapezoidal, rectangular or square cross-section.
• the coils 28 used in the electromagnet arrangements of the induction motor will vary according to the desired application of the motor.
• a first coil 28 surrounds the first and second pole pieces of each electromagnet core.
• the electromagnet assembly may further includes a plurality of second coils (not shown). Assuming there are n electromagnets in the electromagnet assembly, each of the second coils may surround the first pole piece of an nth electromagnet and the second pole piece of an nth-1 electromagnet.
• an electromagnet configuration for an alternative embodiment of the induction motor uses at least three electromagnets, each having a first and a second pole piece.
• a first coil 30 surrounds the first electromagnet first 38 and second 40 pole pieces and a second coil 32 surrounds the second electromagnet first 42 and second 44 pole pieces. Opposite currents are applied to the first and second coils.
• a third coil 34 surrounds the the first electromagnet second pole piece 40 and the second electromagnet first pole piece 42.
• a fourth coil 36 surrounds the second electromagnet second pole s piece 44 and the third electromagnet first pole piece 46. Opposite currents are applied to the third and fourth coils. This pattern is repeated for the number of desired electromagnets for any particular application.
• the electromagnet arrangement includes at least three electromagnets, each having a first and a second pole piece.
• a first coil 50 surrounds the first electromagnet first 56 and i5 second 58 pole pieces and the second electromagnet first pole piece 60
• a second coil 52 surrounds the first electromagnet second pole piece 58 and the second electromagnet first 60 and second 62 pole pieces
• a third coil 54 surrounds the second electromagnet first 60 and second 62 pole pieces and
• the current applied to the first coil 50 is preferably at 240 degrees, the current applied to the second coil 52 is at 0 degrees, and the current applied to the third coil 54 is at 120 degrees. This pattern is also repeated for the number of desired
• first electromagnet assembly and the second electromagnet assembly are assembled in symmetrical relationship to each other.
• the 3o first (or upper) and second (or lower) electromagnet assemblies are positioned such that the polar faces of the first electromagnet assembly are in a mirrored facing relationship with the pole faces of the second electromagnet assembly, defining a gap 66 therebetween.
• the ferromagnetic conductor rotor disk 16 is disposed in the gap 66 between the pole faces of the first and second electromagnetic assemblies 12, 14 and rotates about a central axis 68 of the motor.
• the motor includes a first electromagnet assembly frame 70 and a second electromagnet assembly frame 72, corresponding to the respective first and second electromagnet assemblies.
• the electromagnetic assembly frames are each substantially planar disks with n number of chambers 74 in the disk corresponding to the n number of electromagnets in the corresponding electromagnet assembly.
• the chambers are arranged symmetrically around the central axis 68 of the motor such that when assembled, the electromagnets will be disposed symmetrically around the central axis.
• Each of the electromagnets is placed in a chamber during assembly.
• Each of the electromagnets of the first electromagnet assembly 12 are disposed in the chamber such that the electromagnet is suspended below the first electromagnet assembly frame.
• Each of the electromagnets of the second electromagnet assembly 14 are assembled such that the electromagnet is supported above the second electromagnet frame.
• the electromagnet frames include a positioning holes 76 aligned with each chamber. Pins are placed through the positioning holes after the electromagnets are disposed in the chamber in order to hold the electromagnets in position.
• the first and second electromagnet frames 70, 72 are axially spaced from one another by a spacer member 76.
• the spacer is dimensioned to maintain the upper and lower electromagnet assemblies at a proper distance from each other.
• the electromagnet assemblies are disposed intermediate a first end plate 78 and a second end plate 80. The two end plates fastened together by a plurality of endplate fasteners 82.
• the rotor disk 16 is disposed in the gap 66 between the pole faces of the first and second electromagnet assemblies.
• the disk is assembled so as to rotate about the central axis of the motor. More specifically, the rotor disk 16 is press fit onto a rotor hub 84.
• a shaft 86 extends though the center of the rotor disk and through the center of the end plates and aligned with the central axis of the motor. Bearings 88 surround the shaft at the point where the shaft extends through the end plates.
• the induction motor can be linear or rotary and can be made reversible to function as an actuator.
• the motor may also be used as an induction generator or as an induction alternator.
• the use of the motor as a generator or alternator requires only the modification of the electrical system driver such that the power generated or recovered is channeled to a battery or power grid.
• the operation of the motor as a motor requires that the magnetic wave speed is greater than the tangential speed of the rotor.
• the operation of the motor as an alternator requires that the magnetic wave speed is less than the tangential speed of the rotor.
• the magnetic wave speed is the same as the tangential speed of the rotor there is no transfer between electrical energy and mechanical energy.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Induction Machinery (AREA)
• Control Of Ac Motors In General (AREA)
• Linear Motors (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=23764652

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (1)

Family Cites Families (5)

• 1996
  • 1996-03-29 EP EP96911497A patent/EP0797861A4/de not_active Withdrawn
  • 1996-03-29 AU AU54371/96A patent/AU5437196A/en not_active Abandoned
  • 1996-03-29 CA CA002203239A patent/CA2203239A1/en not_active Abandoned
  • 1996-03-29 WO PCT/US1996/004378 patent/WO1996037036A1/en not_active Ceased
  • 1996-05-16 PE PE1996000339A patent/PE3098A1/es not_active Application Discontinuation
  • 1996-05-17 AR AR33655196A patent/AR001972A1/es unknown

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