Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
  • H02K23/56—Motors or generators having iron cores separated from armature winding
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine

Definitions

• the subject of the invention is a spherical, direct current, cage rotor electric motor.
• a very wide scale of direct current electric motors is known.
• the direct current electric motors of the electric motor driven vehicles constitute one large group of them.
• the US-PS No. 4 948 998 describes a twin-commutator, highly reliable direct current electric motor, provided with two independent, parallel windings, arranged in the rotor core. Through the bush systems located on both sides of the motor and through the commutator, the windings can be used separately or together.
• the rotor is cylindrical, non-self carrying and the stator contains field windings.
• the field magnets of the direct current electric motor with cylindrical, ironless, self-carrying rotor according to the solution of US-PS No. 4 1 10 645 are located outside of the rotor, while the flux conducting yoke is located within the rotor.
• a cylindrical, direct current, electric motor is described also in HU-PS No. 189 040, where the rotor of the implementation according to Fig. 2 thereof is a disk shaped wire coil, with significant parasite coil-head wire lengths and masses.
• the double rotor and the commutators on the rotors of the solution according to Fig. 3 thereof are also disk shaped and made of printed circuits, while the bushes are directed radially.
• a solution for the optimal design of the exciting circuit is the use of high energy, double-sided permanent magnets, preferably made of alloys, the magnetic line of force of which is radial over a relatively large angular range, a direct consequence of which is that the (B) induction lines are perpendicular to the direction of the current (I), and further, to the generated force (F).
• the second question i.e. the design of the rotor is a more complex problem.
• a meaningful increase of efficiency can only be achieved by reducing the amount of energy transformed into heat according to the I R power formula. It can be regarded solved by using a spherical shell shaped rotor, made of copper profiles of relatively large cross section and strength which, at the same time, is suitable for transmitting torque.
• the objective of the invention was achieved by designing a spherical, direct current, cage rotor electric motor, the stator of which is composed of an inner part, made of a spherical, hollow, flux conducting, soft magnetic yoke, and a surrounding outer part of spherical shell shape, consisting of segmental parts or cast over the inner part, and made of permanent magnet, the output axle is a splined tubular shaft, protruding through the hole of the inner part.
• the cage rotor is a spherical surface of revolution surrounding and enclosing the ferromagnetic stator of sandwich structure angular- symmetrically, which is composed of copper profiles, arched along the planes parallel to the geometric axis of the splined tubular shaft, the insulated hub-parts of which are fixed to the splined tubular shaft by means of screw type clamping bushes, the ends of the copper profiles are machined into planes perpendicular to the geometric axis of the splined tubular shaft, and which form disk shape commutators, to the commutators bushes, preferably made of bronze-graphite or mercury, are resiliently coupled, whose terminals are formed as plug- socket holders or clamping screws.
• the inner part of the stator can be of meridian lattice structure.
• the caged rotor can have a form different from spherical, e.g. ellipsoid of rotation, eventually a discus form, nevertheless, it must be a body of rotation.
• the equatorial of the cage rotor has the shape of a torus, and it is provided with a fiber glass reinforced heat resistant plastic stiffener ring, which is concentrically surrounded by segmented permanent magnetic main poles, which in turn are surrounded by the shell structure of soft magnetic yokes made of two hemispherical-like parts that are pressed to one another at their edges, which in turn are surrounded by a light metal alloy, for example aluminum, hollow casing containing openings, and between the stator and the splined tubular shaft, and between the casing and the splined tubular shaft bearings, preferably roller bearings, and sealing elements are arranged.
• a light metal alloy for example aluminum
• the casing can be made of two hemispherical parts provided with ventilating openings, and they can be fixed together by, for example, bolts, however, a spherical plastic net or lattice work of appropriate strength can also be used.
• air-outlet channels having a tangential outlet end sections are formed in the permanent magnetic main poles, in the soft magnetic yoke shell structure, as well as in the casing parts. Tangential baffles are arranged at the outlet part of said end section.
• the motor thus has a splined tubular shaft 1 , which has, at its larger diameter middle section, a stator, which comprises a spherical, hollow inner part 2 made of a flux conducting soft magnetic yoke, and a permanent magnetic outer part 3 surrounding said inner part 2, which consists of segmental parts or which is cast onto the inner part 2.
• a stator which comprises a spherical, hollow inner part 2 made of a flux conducting soft magnetic yoke, and a permanent magnetic outer part 3 surrounding said inner part 2, which consists of segmental parts or which is cast onto the inner part 2.
• the stator is surrounded by an angular- symmetric, spherical shell surface of revolution shaped cage rotor 6, which is made of copper profiles, preferably profiled plates or rods, that are arched in planes parallel to the geometric axis 13 of the splined tubular shaft 1, the ends of the profiles constitute, at the splined tubular shaft 1 , the commutators 10A, 10B, ... of disk segment shape, which are machined into a plane perpendicular to the geometric axis 13 of the splined tubular shaft 1.
• the caged rotor 6 is strengthened by a ring 7 made of insulating material, preferably fiber glass reinforced heat resistant plastic, which is press molded - by forming air channel(s) therein simultaneously - onto the cage rotor 6, already mounted on the stator.
• the cage rotor 6 is surrounded by permanent magnetic main poles 8 shaped as spherical shell segments, bordered by planes parallel to the geometric axis 13 of the splined tubular shaft 1, the permanent magnetic main poles 8 in turn are surrounded, also in the shape of a spherical shell, by the shell structure of soft magnetic yokes 9, split along the biggest diameter ('equator').
• the direction of the developing magnetic field in the space between the permanent magnetic main poles 8 of the assembled motor is radial.
• the outer part of the spherical, direct current, cage rotor electric motor is composed of by the casing parts 12A and 12B, which, too, are spherical, fixed together by bolts at their biggest diameter, provided with gill-openings and preferably are webbed on their outside, and made of light metal alloy, for example aluminum.
• a spherical plastic web or lattice work can also be used.
• roller bearings 16A and 16B and bearing boxes 18A, 18B are arranged between the hollow inner part 2 and outer part 3 of the stator and the splined tubular shaft 1 .
• roller bearings 16A and 16B and bearing boxes 18A, 18B are arranged between the casing parts 12A, 12B and the splined tubular shaft 1 roller bearings 17A, 17B and sealing elements 19A, 19B.
• large openings are formed.
• the bores of the bearing boxes 18 A, 18B connect the openings 15 with the space of the cage rotor 6.
• compressed air which coming from one (or both) end(s) of the splined tubular shaft 1 , traveling within it, enters the interior of the motor by passing through the openings 15 of the splined tubular shaft 1 in the range of its geometric center, as well as through the smaller openings 20A, 20B, provided in the splined tubular shaft 1 at the planes of the commutators 10A, 10B, then it leaves the motor through the bores of the bearing boxes 18A, 18B and through the (not shown) gill-openings of the casing parts 12A, 12B.
• the moment of inertia of the self-carrying 6 cage rotor is small and, further, there is no wattless component arising from the coil-heads, therefore the motor is especially suitable for fast (for example servo) drives;
• the ironless caged rotor also acts as a centrifugal blower or turbine of double-side inlet, provided with meridian baffles;
• the splined tubular shaft makes it possible to use the motor as a single-flow propeller turbine, for example in case of sport aircraft.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Dc Machiner (AREA)
• Motor Or Generator Frames (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Permanent Field Magnets Of Synchronous Machinery (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=89995277

Family Applications (1)

Country Status (9)

Cited By (4)

Families Citing this family (1)

Citations (8)

• 1997
  • 1997-06-23 HU HU9701088A patent/HU222458B1/hu not_active IP Right Cessation
• 1998
  • 1998-06-12 PL PL98337718A patent/PL337718A1/xx unknown
  • 1998-06-12 WO PCT/HU1998/000058 patent/WO1998059411A1/en not_active Application Discontinuation
  • 1998-06-12 JP JP50401899A patent/JP2002516060A/ja active Pending
  • 1998-06-12 KR KR19997012171A patent/KR20010014115A/ko not_active Application Discontinuation
  • 1998-06-12 CN CN98808457A patent/CN1268259A/zh active Pending
  • 1998-06-12 CA CA002294161A patent/CA2294161A1/en not_active Abandoned
  • 1998-06-12 AU AU77836/98A patent/AU7783698A/en not_active Abandoned
  • 1998-06-12 BR BR9810332-6A patent/BR9810332A/pt not_active Application Discontinuation

Patent Citations (8)

Non-Patent Citations (1)

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