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  Transport system and dynamo-electric machineUSPTO Application #: 20060033402Title: Transport system and dynamo-electric machine Abstract: A dynamo-electric machine has a stator with a primary winding and a rotor with a field magnet and a shaft. the field magnet includes a first field magnet having different polarity magnetic poles sequentially arranged in a rotation direction and a second field magnet having different polarity magnetic poles sequentially arranged in a rotation direction. The machine further has a mechanism for shifting the first and the second field magnets in axial and rotation directions. (end of abstract) Agent: Crowell & Moring LLP Intellectual Property Group - Washington, DC, US Inventors: Houng Joon Kim, Shigeta Ueda USPTO Applicaton #: 20060033402 - Class: 310261000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20060033402. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a dynamo-electric machine which uses a permanent magnet for field system, and particularly to a method and a dynamo-electric machine for performing the drive and regeneration in a carrier system or transport system. [0002] In a permanent magnet field type dynamo-electric machine of the prior art, an induced electromotive force E is determined by a constant magnetic flux .PHI. generated by a permanent magnet arranged in a rotor and a rotating angular speed .omega. of the dynamo-electric machine. That is, when the rotating angular speed .omega. (rotating speed) of the dynamo-electric machine is increased, the induced electromotive force is proportionally increased. [0003] Accordingly, high torque can be obtained in a low-speed range, but operation in a high-speed range is difficult because the variable range of rotating speed is narrow. Therefore, it may be considered that the high-speed operation range is widened using a field weakening control technology. [0004] Further, the mechanism which uses the centrifugal force by the spring and the governor is disclosed in the Japanese Patent application Laid-open No. 2000-155262 as a method of weakening the field by the magnetic flux generated by permanent magnets. [0005] The method of widening the high speed operation range using the field weakening control technology described above has limitations of heat generation and efficiency decrease due to weakening field current. [0006] Further, the structure of the spring and the governor becomes complex in the method disclosed in the Japanese Patent Application No. 2000-155262. SUMMARY OF THE INVENTION [0007] An object of the present invention is to provide a dynamo-electric machine, in which the field weakening of magnetic flux generated by permanent magnets becomes possible by an simple structure. [0008] Further, another object of the present invention is to provide a transport system which comprises the permanent magnet type dynamo-electric machine which can obtain the high torque characteristic in the low rotating speed region or at the start of the transport system and the high power characteristic in the high rotating speed region. [0009] According to one aspect of the present invention, a dynamo-electric machine includes a stator having a primary winding and a rotor having a field magnet and a shaft. Wherein said field magnet comprises a first field magnet having different polarity magnetic poles sequentially arranged in a rotation direction and a second field magnet having different polarity magnetic poles sequentially arranged in a rotation direction. The dynamo-electric machine further comprises a mechanism for shifting the first and the second field magnets in axial and rotation directions. [0010] According to another aspect of the present invention, a dynamo-electric machine includes a stator having a primary winding and a rotor having a field magnet and a shaft. Wherein said field magnet comprises a first field magnet having different polarity magnetic poles sequentially arranged in a rotation direction and a second field magnet having different polarity magnetic poles sequentially arranged in a rotation direction. The dynamo-electric machine further comprises a mechanism for shifting one field magnet in axial and rotation directions with respect to the other field magnet. Wherein a resultant magnetic field of the first field magnet and the second field magnet is changed. [0011] According to further aspect of the present invention, a transport system comprises a dynamo-electric machine in which a resultant magnetic field of the first field magnet and the second field magnet is changed, comprising a stator with a primary winding and a rotor with a field magnet and a shaft. Said field magnet includes a first field magnet having different polarity magnetic poles sequentially arranged in a rotation direction and a second field magnet having different polarity magnetic poles sequentially arranged in a rotation direction. Said dynamo-electric machine further comprises a mechanism for shifting one field magnet in axial and rotation directions with respect to the other field magnet; a truck of which a power source is said dynamo-electric machine; a current collector which takes the electric power from the outside to said truck; and a power converter for controlling the electric power of said dynamo-electric machine. BRIEF DESCRIPTION OF THE DRAWINGS [0012] FIG. 1 is a view showing the layout of the dynamo-electric machine and the rolling stock according to an embodiment of the present invention. [0013] FIG. 2 is a whole schematic view of dynamo-electric machine shown in FIG. 1. [0014] FIG. 3 is a schematic view showing a case where the magnetic pole centers of equal-polarity of the rotor of the dynamo-electric machine in FIG. 1 is in phase. [0015] FIG. 4 is a schematic view showing a case where magnetic pole centers of equal-polarity of the rotor of the dynamo-electric machine in FIG. 1 are out of phase. [0016] FIG. 5 is graphs showing various kinds of characteristics versus rotating speed of the dynamo-electric machine in FIG. 1. [0017] FIG. 6 is a control block diagram of the dynamo-electric machine in FIG. 1. [0018] FIG. 7 is a view showing another embodiment of a dynamo-electric machine in accordance with the present invention (an actuator in OFF state). [0019] FIG. 8 is a view showing another embodiment of a dynamo-electric machine in accordance with the present invention (an actuator in ON state). [0020] FIG. 9 is a view showing the inside of the rotor of another embodiment of a dynamo-electric machine in accordance with the present invention. [0021] FIG. 10 is a view showing the inside of a rotor of another embodiment of a dynamo-electric machine in accordance with the present invention. Continue reading... Full patent description for Transport system and dynamo-electric machine Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Transport system and dynamo-electric machine patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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