1. A manufacturing method of a stator core of a rotating electrical machine comprising:
a pressing process that forms a core sheet that has slots punched out on one side in a width direction of a strip of steel sheet at a fixed interval to form teeth between the slots, and core-back parts on another side of the steel sheet;
a winding process that forms a helically stacked core by winding spirally and stacking cylindrically the core sheet so that the slots and teeth are positioned in an inner diameter side of the stacked core;
a joining process that joins between each layer of the helically stacked core; and
a finishing process that corrects inner and outer shapes to predetermined forms while correcting gaps of stacking of the helically stacked core; wherein,
the finishing process buckles the core-back part by a coining process that simultaneously moves a coining punch divided in a circumferential direction and arranged around the helically stacked core to a center side in a radial direction and presses an outer surface of each core-back part of the helically stacked core while pressing down an end side of the helically stacked core by a holding device, and
both the core-back part and the teeth are deformed until an end side of an inner circumferential surface of the teeth becomes coaxial with the coining punch and contacts an inner circumferential surface pole arranged inside the helically stacked core so as to correct inner and outer circumferential surfaces of the helically stacked core.
2. The manufacturing method of the stator core of the rotating electrical machine according to claim 1, wherein,
an amount of buckling deformation of each core-back part in a radial direction by the coining process is smaller at a slot position compared with a teeth position in a circumferential direction, and
an amount of movement of each core-back part in the radial directional is larger at the slot position compared with the teeth position in the circumferential direction.
3. The manufacturing method of the stator core of the rotating electrical machine according to claim 1, wherein,
a plate thickness after the buckling near a perimeter of each core sheet of the helically stacked core after the coining process is thinner than a plate thickness of the core sheet.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A wide tuning oscillator based local oscillator (LO) generator system, comprising:
a wide tuning range oscillator for generating a signal with a first initial frequency or a second initial frequency in response to a control voltage;
a first frequency controlling circuit for converting the first initial frequency of the signal into a final frequency, wherein the final frequency forwarded by the first frequency controlling circuit is separated from the first initial frequency by a factor of at least two and wherein the final frequency forwarded by the first frequency controlling circuit is not a harmonic of the first initial frequency; and
a second frequency controlling circuit for converting the second initial frequency of the signal into the final frequency, wherein the final frequency forwarded by the second frequency controlling circuit is separated from the second initial frequency by a factor of at least two and wherein the control voltage is associated with an output level of a power amplifier (PA) transmitter coupled to the first frequency controlling circuit or the second frequency controlling circuit.
2. The system of claim 1, further comprising a phase lock loop coupled to the wide tuning range oscillator for forwarding the control voltage.
3. The system of claim 1, further comprising a multiplexer coupled to the first frequency controlling circuit and the second frequency controlling circuit for forwarding the signal with the final frequency forwarded by the first frequency controlling circuit or the second frequency controlling circuit based on the output level of the PA transmitter.
4. The system of claim 3, wherein the multiplexer performs the forwarding the signal with the final frequency forwarded by the first frequency controlling circuit if the output level of the PA transmitter is greater than a threshold voltage and wherein the multiplexer performs the forwarding the signal with the final frequency forwarded by the second frequency controlling circuit if the output level of the PA transmitter is less than the threshold voltage.
5. The system of claim 4, wherein the signal comprises an in-phase signal or a quadrature signal.
6. The system of claim 4, wherein the multiplexer is coupled to at least one mixer which is further coupled to the PA transmitter.
7. The system of claim 1, wherein the first frequency controlling circuit comprises:
a first frequency divider for dividing the first initial frequency of the signal into a first frequency;
a second frequency divider for dividing the first frequency into a second frequency; and
a frequency combiner for adding the first frequency and the second frequency into the final frequency.
8. The system of claim 7, wherein the first initial frequency is 6.4 GHz, the first frequency is 1.6 GHz, the second frequency is 0.8 GHz, and the final frequency is 2.4 GHz.
9. The system of claim 7, wherein the frequency combiner comprises a mixer.
10. The system of claim 1, wherein the second frequency controlling circuit comprises a third frequency divider for dividing the second initial frequency of the signal into the final frequency.
11. The system of claim 10, wherein the second initial frequency of the signal is 4.8 GHz and the final frequency is 2.4 GHz.
12. The system of claim, 10, wherein the frequency divider is coupled to at least one mixer which is further coupled to a low noise amplifier (LNA) receiver.
13. A wide tuning oscillator based local oscillator (LO) generator, comprising:
a wide tuning range oscillator for generating a signal with a first initial frequency or a second initial frequency in response to a control voltage;
a first frequency controlling circuit for converting the first initial frequency of the signal into a final frequency, comprising:
a first frequency divider for dividing the first initial frequency of the signal into a first frequency;
a second frequency divider for dividing the first frequency into a second frequency;
a frequency combiner for adding the first frequency and the second frequency into the final frequency, wherein the final frequency forwarded by the first frequency controlling circuit is separated from the first initial frequency by a factor of at least two and wherein the final frequency forwarded by the first frequency controlling circuit is not a harmonic of the first initial frequency; and
a second frequency controlling circuit for converting the second initial frequency of the signal into the final frequency, comprising:
a third frequency divider for dividing the second initial frequency of the signal into the final frequency, wherein the final frequency forwarded by the second frequency controlling circuit is separated from the second initial frequency by a factor of at least two and wherein the control voltage is associated with an output level of a power amplifier (PA) transmitter coupled to the first frequency controlling circuit or the second frequency controlling circuit.
14. The generator of claim 13, further comprising a phase lock loop coupled to the wide tuning range oscillator for forwarding the control voltage.
15. The generator of claim 13, further comprising a multiplexer coupled to the first frequency controlling circuit and the second frequency controlling circuit for forwarding the signal with the final frequency forwarded by the first frequency controlling circuit or the second frequency controlling circuit based on the output level of the PA transmitter.
16. The generator of claim 15, wherein the multiplexer performs the forwarding the signal with the final frequency forwarded by the first frequency controlling circuit if the output level of the PA transmitter is greater than a threshold voltage and wherein the multiplexer performs the forwarding the signal with the final frequency forwarded by the second frequency controlling circuit if the output level of the PA transmitter is less than the threshold voltage.
17. The generator of claim 13, wherein the frequency combiner comprises a mixer.
18. The system of claim 13, wherein the first initial frequency is 6.4 GHz, the second initial frequency of the signal is 4.8 GHz, the first frequency is 1.6 GHz, the second frequency is 0.8 GHz, and the final frequency is 2.4 GHz.
19. A transceiver with a wide tuning oscillator based local oscillator (LO) generator, comprising:
a wide tuning oscillator based LO generator, comprising:
a phase lock loop for forwarding a control voltage;
a wide tuning range oscillator for generating a signal with a first initial frequency or a second initial frequency in response to the control voltage;
a first frequency controlling circuit for converting the first initial frequency of the signal into a final frequency, wherein the final frequency forwarded by the first frequency controlling circuit is separated from the first initial frequency by a factor of at least two and wherein the final frequency forwarded by the first frequency controlling circuit is not a harmonic of the first initial frequency; and
a second frequency controlling circuit for converting the second initial frequency of the signal into the final frequency, wherein the final frequency forwarded by the second frequency controlling circuit is separated from the second initial frequency by a factor of at least two;
a low noise amplifier (LNA) for forwarding a received signal with a channel specific radio frequency (RF) via an antenna;
at least one receiver mixer for mixing the received signal with the channel specific RF and the signal with the final frequency into a received signal with a constant intermediate frequency (IF);
at least one transmitter mixer for mixing a transmitted signal with the constant IF and the signal with the final frequency into a transmitted signal with the channel specific RF;
a power amplifier (PA) for forwarding the transmitted signal; and
a multiplexer coupled to the first frequency controlling circuit and the second frequency controlling circuit for forwarding the signal with the final frequency forwarded by the first frequency controlling circuit or the second frequency controlling circuit to the power amplifier based on an output level of the power amplifier, wherein the control voltage is associated with an output level of the power amplifier.
20. The transceiver of claim 19, wherein the multiplexer performs the forwarding the signal with the final frequency forwarded by the first frequency controlling circuit if the output level of the PA is greater than a threshold voltage and wherein the multiplexer performs the forwarding the signal with the final frequency forwarded by the second frequency controlling circuit if the output level of the PA is less than the threshold voltage.