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US 6,541,887 B2Granted
Permanent-magnet motor-generator with voltage stabilizer
OwnerHideo Kawamurainventor
Life of this patent
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OwnerHideo Kawamurainventor
Estimating the term…
A motor-generator is disclosed, in which electromagnet coils are arranged at axially opposite ends of the stator, each to each end, while connections among winding sets are changed in response to the rpm of the rotor. This makes it possible to control the voltage, either at high speed or at low speed, thereby increasing the torque at low speed, or the torque on the rotor shaft at low speed and rendering the voltage stable. A rotor is comprised of a cylindrical magnetic path axially elongating to extent confronting the electromagnet coils, and a permanent-magnet member of more than one permanent-magnet piece extending axially over the magnetic path. The cylindrical magnetic path includes an N-pole annular portion confronting any one of the electromagnet coils, N-pole electromagnet magnetic paths stemming from the N-pole annular portion in opposition to N-poles of the permanent-magnet pieces, an S-pole annular portion arranged confronting another of the electromagnet coils, and S-pole electromagnet magnetic paths stemming from the S-pole annular portion in opposition to S-poles of the permanent-magnet pieces.
A motor-generator with a voltage stabilizer, comprising a multipolar permanent-magnet rotor mounted on a rotor shaft supported for rotation in a stator housing, a stator fixed to the housing with arranged around the rotor, and electromagnet coils fixed to axially opposing ends of the housing, each to each end, in opposition to axially opposing ends of the rotor, wherein the rotor is composed of a cylindrical magnetic path arranged around the rotor shaft and extended axially to areas confronting the electromagnet coils, a permeable member surrounding around the cylindrical magnetic path, and a permanent-magnet member of more than one permanent-magnet piece extended axially and arranged circumferentially around an outside periphery of the permeable member with N- and S-poles on either piece alternating in polarity circularly around the rotor, and wherein the cylindrical magnetic path includes an N-pole annular portion arranged confronting any one of the electromagnet coils, N-pole electromagnet magnetic paths stemming from the N-pole annular portion in opposition to the N-poles of the permanent-magnet pieces, an S-pole annular portion arranged confronting another of the electromagnet coils, and S-pole electromagnet magnetic paths stemming from the S-pole annular portion in opposition to the S-poles of the permanent-magnet pieces, the N-pole and S-pole electromagnet magnetic paths alternating in polarity circularly around the permanent-magnet member with nonmagnetic pieces being each interposed between any two adjacent electromagnet magnetic paths.
A motor-generator comprising a rotor shaft supported for rotation in stator housing, a rotor mounted on the rotor shaft, a stator arranged confronting an outside periphery of the rotor and fixed to the housing, and electromagnets arranged on the rotor shaft at axially opposing ends of the rotor, each to each end, wherein the rotor is composed of an electromagnet core of permeable pieces extended axially to electromagnets and arranged circumferentially around the rotor shaft with nonmagnetic pieces being each interposed between any two adjacent permeable pieces, a cylindrical yoke of permeable material arranged over the electromagnet core, and a permanent-magnet member of more than one permanent-magnet piece arranged around an outside periphery of the cylindrical yoke, with nonmagnetic pieces being each interposed between any two adjacent permanent-magnet pieces, in the form of cylinder in such an array that the poles on either permanent-magnet piece alternate in polarity circularly around the rotor, and wherein the electromagnets are each composed of any one of axially opposing ends of the electromagnet core surrounding the rotor shaft, and, an electromagnet coil arranged on a magnetic path case in the housing in opposition to the associated end, the electromagnet core being notches at angular intervals so as to provide magnetic circuits spaced circumferentially to flow the magnetic flux in axially but alternately opposite directions.
A motor-generator comprising a rotor shaft supported for rotation in stator housing, a rotor mounted on the.rotor shaft, a stator arranged confronting an outside periphery of the rotor and fixed to the housing, and electromagnets composed of annular electromagnet cores arranged on the rotor shaft at axially opposing ends of the rotor, each to each end, electromagnet coils arranged on magnetic path cases in the housing in opposition to the electromagnet cores, each to each core, wherein the rotor is composed of permeable member of permeable pieces arranged circumferentially around the rotor shaft in the form of cylinder with nonmagnetic pieces being each interposed between any two adjacent permeable pieces, a cylindrical magnetic path core of permeable pieces arranged circumferentially over the permeable member with nonmagnetic pieces being each interposed between any two adjacent permeable pieces, and a permanent-magnet member of more than one permanent-magnet piece arranged around an outside periphery of the magnetic path core, with nonmagnetic pieces being each interposed between any two adjacent permanent-magnet pieces, in the form of cylinder in such an array that the poles on either permanent-magnet piece alternate in polarity circularly around the rotor, and wherein the electromagnet cores are each composed of radial extensions coming in close contact with the permeable member of the rotor to ensure axial flows of magnetic flux, and an annular portion notched at angular intervals to separate axially the radial extensions apart from the rotor.
Dependencies are inferred from the claim text.