1. A component comprising:
a longitudinal axle, having a plurality of keybars extending outward from a surface of the longitudinal axle, wherein each of the plurality of keybars are disposed axially along and circumferentially around the longitudinal axle, further wherein an axis of the plurality of keybars is parallel to the longitudinal axle.
2. The component of claim 1, wherein a profile of all midpoints of the plurality of keybars is helicoidal around the longitudinal axle.
3. The component of claim 1, wherein each of the plurality of keybars are straight.
4. The component of claim 1, wherein each of the plurality of keybars are configured to receive a corresponding key on a corresponding rotor section of a plurality of rotor sections, thereby defining a stacked rotor assembly having a step-skewed configuration.
5. The component of claim 4, wherein each of the plurality of rotor sections comprises a plurality of rotor laminations.
6. The component of claim 4, wherein each of the plurality of rotor sections comprises a solid core section.
7. The component of claim 1, wherein each of the plurality of keybars are helicoidal.
8. The component of claim 1, wherein each of the plurality of keybars are configured to receive a corresponding key on a corresponding rotor section of a plurality of rotor sections, thereby defining a stacked rotor assembly having a continuously skewed configuration, wherein the stacked rotor assembly is configured for use in one of an interior permanent magnet (IPM) machine and a Synchronous Reluctance motor.
9. The component of claim 3, the longitudinal axle comprising a plurality of sequential longitudinal sections, wherein each of the plurality of keybars correspond to a longitudinal section of the longitudinal axle.
10. The component of claim 9, wherein each of the plurality of keybars extend partially longitudinally from its corresponding longitudinal section to an adjacent longitudinal section.
11. The component of claim 4, wherein the plurality of keybars are disposed circumferentially around the longitudinal axis, wherein a skew angle, \u03b8sect, is an angle between adjacent rotor sections.
12. The component of claim 11, wherein the skew angle, \u03b8sect, is selected to provide a shift in a torque vs. rotor position profile of the plurality of rotor sections, thereby reducing torque ripple.
13. The component of claim 11, wherein an offset \u03b8key between adjacent keybars comprises \u03b8sect+\u03b80, wherein \u03b80 comprises an additional mechanical offset for clearance for adjacent rotor sections.
14. The component of claim 1, wherein the plurality of keybars comprises a first set of keybars, the component further comprising a second set of keybars, wherein each of the keybars of the second set of keybars is located circumferentially opposite a keybar of the first set of keybars.
15. An assembly comprising:
a plurality of motor rotor sections; and
a rotor bar extending through the plurality of motor rotor sections, wherein the rotor bar and the plurality of motor rotor sections are configured to step-skew the plurality of motor rotor sections from each other.
16. The assembly of claim 15, further comprising a plurality of end plates having the plurality of motor rotor sections located therebetween.
17. The assembly of claim 15, further comprising a plurality of magnets located within the motor rotor sections.
18. The assembly of claim 17, wherein the plurality of magnets comprise a material of at least one of ferrite, alnico, and a rare earth metal.
19. The assembly of claim 15, wherein each of the plurality of motor rotor sections comprise a solid rotor core section.
20. The assembly of claim 15, wherein each of the plurality of motor rotor sections comprise a plurality of rotor laminations.
21. An interior permanent magnet (IPM) machine comprising the assembly of claim 17; and, a stator surrounding the assembly.
22. The IPM machine of claim 21, wherein the assembly is configured to reduce torque ripple in the IPM machine.
23. A Synchronous Reluctance motor comprising the assembly of claim 15; and, a stator surrounding the assembly.
24. The Synchronous Reluctance motor of claim 23, wherein the assembly is configured to reduce torque ripple in the Synchronous Reluctance motor.
25. A method comprising:
providing a longitudinal axle shaft; and
removing material from the longitudinal shaft to define one of:
a plurality of recesses configured to receive a plurality of keybar protrusions; and
a plurality of keybar protrusions, wherein the plurality of keybar protrusions are disposed circumferentially around the longitudinal axis.
26. An Interior Permanent Magnet (IPM) machine rotor comprising:
a plurality of motor rotor sections, wherein the plurality of motor rotor sections are step-skewed.
27. The IPM machine rotor of claim 25, wherein the plurality of motor rotor sections are laminated.
28. The IPM machine rotor of claim 25, wherein the plurality of motor rotor sections are solid core.
29. A Synchronous Reluctance motor rotor comprising:
a plurality of motor rotor sections, wherein the plurality of motor rotor sections are step-skewed.
30. The Synchronous Reluctance motor rotor of claim 29, wherein the plurality of motor rotor sections are laminated.
31. The Synchronous Reluctance motor rotor of claim 29, wherein the plurality of motor rotor sections are solid core.
32. A method of assembly comprising:
providing a plurality of rotor core sections; and
assembling each of the plurality of rotor core sections on a keyed axle shaft, said keyed axle shaft includes at least one key thereon, wherein the at least one key accommodates the plurality of rotor core sections, thereby defining a skewed rotor core stack assembly.
33. The method of claim 32, further comprising applying a compressive force to the skewed rotor core stack assembly.
34. The method of claim 33, further comprising, before applying the compressive force, adjoining at least one compression plate to at least one end of the skewed rotor core stack.
35. The method of claim 32, further comprising:
inserting a plurality of magnets through the plurality of rotor core sections; and
affixing the plurality of magnets to the plurality of rotor core sections.
36. The method of claim 32, the keyed axle shaft including a plurality of keys there, thereby defining a step-skewed rotor core stack.
37. The method of claim 34, the affixing comprising one of:
infusing a resin on the plurality of rotor core sections;
clamping the plurality of magnets with a filler or wedge material; and
shrinking the plurality of magnets into the rotor core sections.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed:
1. A digital signal processor comprising:
first means for selecting a transport stream corresponding to any channel from a transport stream containing a plurality of multiplexed channels,
second means for separating video data and audio data in any desired program from said transport stream by referring to supplementary data in said selected transport stream,
third means for decoding said separated video and audio data,
fourth means for sending video data, audio data and supplementary data from external devices to said second means, and detecting data indicating a program discontinuity, and
fifth means for initializing said third means when said fourth means detects data indicating said program discontinuity.
2. A digital signal processor as defined in claim 1, wherein supplementary data in said second means is updated when said fourth means detects data indicating a program discontinuity.
3. A digital signal processing method, in a digital signal processor comprising first means for selecting a transport stream corresponding to any channel from a transport stream containing a plurality of multiplexed channels, second means for separating video data and audio data in any desired program from said transport stream by referring to supplementary data in said selected transport stream, third means for decoding said separated video and audio data, and fourth means for sending video data, audio data and supplementary data from external devices to said second means, and detecting data indicating a program discontinuity,
said third means is initialized when said fourth means detects data indicating a program discontinuity.
4. A digital signal recordingplayback device comprising:
first means for inputtingoutputting a digital signal coded by a predetermined coding scheme,
second means for recording said digital signal transmitted by said first means in a recording medium,
third means for reproducing said digital signal recorded on said recording medium, and
fourth means for detecting a program change in said digital signal played back by said third means,
wherein said fourth means adds a first identifying data to the digital signal output by said first means when a program change is detected.
5. A digital signal recordingplayback device as defined in claim 1, further comprising fifth means for inputting an operating mode, and adding a second identifying data to the digital signal output by said first means when a speed change playback mode is specified.
6. A digital signal playback method, wherein first identifying data is added to said digital signal when a program in said playback digital signal has changed, when a digital signal coded by a predetermined coding scheme is played back from a recording medium and output to an external device.
7. A digital signal playback method as defined in claim 3 wherein a second identifying data is further added to said digital signal when speed change playback is performed.