Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-06-22
1999-11-30
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310114, 310115, 310212, 310103, 318154, 318156, 318254, H02K 4718
Patent
active
059948116
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to electric motors.
A problem in connection with ordinary electric motors is that they are not particularly efficient when the drive shaft operates at a low rpm. E.g. in lifting cranes it would be a great advantage having motors with the characteristic of operating efficiently at low speeds, and which easily and efficiently might provide a change of the rotation direction while maintaining a strong torque through the neutral position.
From German Offenlegungsschrift nos. 2237099 and 2928770 are known torque converters which make use of a self-induced voltage created by having the shaft connected to a drive motor and one part of the converter operating as a generator, while another part operates as a motor. By regulating the voltages between the two parts, one achieves to be able to control the rpm as well as the torque of the output shaft, independent of the drive motor rpm. However, in these cases one depends entirely on a drive motor connected to the generator part of the torque converter. The converter units are in reality designed as a replacement for hydraulics solutions.
U.S. Pat. No. 4,532,447 also discloses a torque converter or a speed variator. This converter consists of an outer fixed armature (stator), an intermediate rotor and a rotor arranged centrally therein. The intermediate rotor is equipped with two sets of windings, the outer winding interacting with the outer, fixed armature and the inner winding influencing the inner rotor.
It appears from the patent that the converter operates as a torque variator by connecting the inner rotor to a drive unit (e.g. a car engine) and connecting the intermediate rotor to a gearbox. Control of rpm and torque is effected in a very complicated manner, by controlling continuously that opposite poles are in correct mutual position during operation. Further, there seems to be a limitation on the power magnitudes to be transferred without making the construction relative voluminous, since the power to be transferred, is dependent on the size of the windings on the intermediate rotor.
British patent application, publication no. GB-A-2,271,025 discloses an electric motor having characteristics somewhat related to the characteristics of the present invention. The prior art motor is constructed from two stators (armatures) fixedly mounted in a motor housing, with an annular rotor arranged between the two fixed stators. The rotor consists of several small permanent magnets or magnetizable units (i.e. coils) fastened to the main shaft by means of arms or "spokes".
The British patent application further describes that every coil or magnet is rotatable about its respective axis and absorbs a torque which is created when a voltage is supplied to the outer stator, so that the shaft does not rotate. By supplying a voltage to the inner stator and/or the rotating units, the rotation of each rotating unit will be braked and cause the shaft to start rotating.
The prior art motor utilizes variations of frequency or voltage to the two armatures in order to control the speed.
However, the rotor is fixedly mounted in the shaft, and is composed from several detached small rotors rotating between the armatures and being peripherally (radially) placed in relation to the shaft. A voltage can be supplied to the small rotors via slip rings or similar. The design with several coils or magnets rotating about respective axes between the armatures and radially in relation to the shaft, and being fastened on arms fixed to the shaft, makes the construction relatively complicated, and it seems that the motor size will be relatively voluminous if large power magnitudes are to be transferred.
German Offenlegungsschrift DE 4341128 discloses a cylindrically shaped motor having a free-running rotor, so that the motor is a "double motor" where the output shaft rpm may appear as a difference between the rpm's of two part motors. However, the motor is restricted to a cylindrical embodiment, and is obviously not intended manufactured for utilization in an rpm range arou
REFERENCES:
patent: 4532447 (1985-07-01), Cibie
patent: 5144180 (1992-09-01), Satake
patent: 5525851 (1996-06-01), Kumamoto
Electret AS
Ramirez Nestor
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