1. A communication device comprising:
a reception unit that receives a signal transmitted from another communication device via a transmission path;
a transmission unit that transmits a signal to the another communication device via the transmission path;
an error rate measurement unit that measures an error rate representing a probability of occurrence of errors in a signal received by the reception unit in a case where a bi-directional communication with the another communication device is performed; and
a phase adjustment unit that adjusts a phase of a signal transmitted from the transmission unit to the another communication device based on an error rate measured by the error rate measurement unit.
2. The communication device according to claim 1, wherein the error rate measurement unit measures error rates in the signal received by the reception unit with respect to phases adjusted by the phase adjustment unit, and
the phase adjustment unit selects a first phase that makes the error rates equal to or smaller than a given value among phases, and adjusts the phase of the signal transmitted from the transmission unit to the another communication device to the first phase.
3. The communication device according to claim 1, wherein the reception unit receives an error rate in a signal received by the another communication device from the another communication device, and
the phase adjustment unit adjusts the phase of the signal transmitted from the transmission unit to the another communication device based on the error rate measured by the error rate measurement unit and the error rate in the signal received by the another communication device.
4. The communication device according to claim 1, wherein the transmission unit includes a clock signal generating unit that generates a clock signal which functions as a standard of a timing at which the transmission unit transmits a signal, and
the phase adjustment unit adjusts the phase of the signal transmitted from the transmission unit to the another communication device by adjusting a phase of the clock signal.
5. The communication device according to claim 1, wherein the reception unit includes a plurality of reception portions,
the transmission unit includes a plurality of transmission portions, and
the error rate measurement unit includes:
an error rate comparison unit that measures respective error rates in the plurality of reception portions, and compares the error rates; and
a link establishment sequence determination unit that determines a sequence to establish a link between the plurality of reception portions and the plurality of transmission portions and the another communication device based on a result of a comparison by the error rate comparison unit.
6. The communication device according to claim 1, further comprising:
a signal level measurement unit;
a signal level comparison unit; and
a link establishment sequence determination unit, wherein
the reception unit includes a plurality of reception portions,
the transmission unit includes a plurality of transmission portions,
the signal level measurement unit measures levels of signals received by the plurality of reception portions,
the signal level comparison unit compares the levels of the signals, and
the link establishment sequence determination unit determines a sequence of establishing a link between the plurality of reception portions and the plurality of transmission portions and the another transmission device based on a result of a comparison by the signal level comparison unit.
7. A communication system comprising:
a transmission path that couples a first communication device with a second communication device, and through which the first communication device and the second communication device transmit signals bi-directionally;
a first reception unit that receives a signal transmitted from the second communication device via the transmission path;
a first transmission unit that transmits a signal to the second communication device via the transmission path; and
a first error rate measurement unit that measures a first error rate representing a probability of occurrence of errors in a signal received by the first reception unit in a case where a bi-direction communication with the second communication device is performed, wherein
the first transmission unit includes:
the first communication device that transmits the first error rate to the second communication device; and
the second communication device, and
the second communication device includes:
a second reception unit that receives a signal and the first error rate transmitted from the first communication device via the transmission path;
a second transmission unit that transmits a signal to the first communication device via the transmission path;
a second error rate measurement unit that measures a second error rate representing a probability of occurrence of errors in a signal received by the second reception unit in a case where a bi-directional communication with the first communication device is performed; and
a phase adjustment unit that adjusts a phase of a signal transmitted from the second transmission unit to the first communication device based on the first error rate and the second error rate.
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 fluid pump comprising:
a stator core having a stator core inner circumferential periphery;
a plurality of coils that are respectively wound around the stator core, the plurality of coils circumferentially generating magnetic poles in the stator core inner circumferential periphery when being supplied with electricity, the magnetic poles being switched by controlling electricity supplied to the plurality of coils;
a rotator that is rotatable within the stator core inner circumferential periphery, the rotator having a rotator outer circumferential periphery opposed to the stator core inner circumferential periphery, the rotator outer circumferential periphery defining magnetic poles different from each other with respect to a rotative direction of the rotator;
a pump portion that has a rotor member, the rotator being adapted to rotate the rotor member for pumping fuel;
a housing that has a housing inner circumferential periphery having an integral protrusion defining a recession, which accommodates the stator core;
a plurality of terminals that electrically respectively connect with the plurality of coils,
wherein the stator core, the plurality of coils, and the plurality of terminals are insert-molded with an electrically insulative resin material,
the plurality of terminals are partially exposed outside of the electrically insulative resin material, and
the stator core has a stator core first axial end defining a stator core outer circumferential end that is at least partially not exposed to the electrically insulative resin material,
wherein the stator core first axial end is located on the stator core on a stator core first side that is proximate to the pump portion,
the electrically insulative resin material defines a cover member that covers the stator core on a stator core second side that is axially opposite to the stator core first side,
the cover member has a cover outer circumferential periphery that defines a fuel seal by making contact with the housing inner circumferential periphery, and
wherein the stator core outer circumferential periphery, the housing inner circumferential periphery, and the cover outer circumferential periphery define a contact portion, and
the contact portion and a portion of the stator core outer circumferential end abutted against a recession axial end define a space.
2. The fluid pump according to claim 1, wherein the pump portion includes a pump case that accommodates the rotor member, and the pump case is abutted axially against the integral protrusion.
3. The fluid pump according to claim 1,
wherein the housing has a thick portion that radially protrudes inwardly in the housing, and
the recession is defined by locating the thick portion between the stator core and the pump portion.
4. The fluid pump according to claim 3,
wherein the housing is formed of metal, and
the recession is defined by applying machining work to the housing inner circumferential periphery including the thick portion.
5. The fluid pump according to claim 1,
wherein the stator core outer circumferential end is entirely not exposed to the electrically insulative resin material, and
the stator core outer circumferential end is abutted against a recession axial end.
6. The fluid pump according to claim 1, wherein the housing is formed of metal.
7. A fluid pump as in claim 1, wherein:
said housing includes a pump housing portion, an intermediate housing portion, and a motor housing portion,
wherein the pump housing portion circumferentially surrounds a pump portion outer circumferential periphery,
the motor housing portion circumferentially surrounds a stator core outer circumferential periphery,
the intermediate housing portion is interposed axially between the pump housing portion and the motor housing portion,
wherein an intermediate housing portion inner diameter is less than a pump housing portion inner diameter, and
the intermediate housing portion inner diameter is less than a motor housing portion inner diameter.
8. A fluid pump comprising:
a stator core having a stator core inner circumferential periphery;
a plurality of coils that are respectively wound around the stator core, the plurality of coils circumferentially generating magnetic poles in the stator core inner circumferential periphery when being supplied with electricity, the magnetic poles being switched by controlling electricity supplied to the plurality of coils;
a rotator that is rotatable within the stator core inner circumferential periphery, the rotator having a rotator outer circumferential periphery opposed to the stator core inner circumferential periphery, the rotator outer circumferential periphery defining magnetic poles different from each other with respect to a rotative direction of the rotator;
a pump portion that has a rotor member, the rotator being adapted to rotate the rotor member for pumping fuel;
a housing that has a housing inner circumferential periphery having an integral protrusion defining a recession, which accommodates the stator core;
a plurality of terminals that electrically respectively connect with the plurality of coils,
wherein the stator core, the plurality of coils, and the plurality of terminals are insert-molded with an electrically insulative resin material,
the plurality of terminals are partially exposed outside of the electrically insulative resin material, and
the stator core has a stator core first axial end defining a stator core outer circumferential end that is at least partially not exposed to the electrically insulative resin material,
wherein the stator core includes a plurality of teeth that are separate from each other,
the plurality of teeth are circumferentially arranged,
the plurality of coils are respectively wound around the plurality of teeth,
each of the plurality of teeth has an outer circumferential periphery that defines a groove, which extends axially, and
the electrically insulative resin material is charged into the groove.
9. The fluid pump according to claim 8, wherein the pump portion includes a pump case that accommodates the rotor member, and the pump case is abutted axially against the integral protrusion.
10. The fluid pump according to claim 8,
wherein the housing has a thick portion that radially protrudes inwardly in the housing, and
the recession is defined by locating the thick portion between the stator core and the pump portion.
11. The fluid pump according to claim 10,
wherein the housing is formed of metal, and
the recession is defined by applying machining work to the housing inner circumferential periphery including the thick portion.
12. The fluid pump according to claim 8,
wherein the stator core outer circumferential end is entirely not exposed to the electrically insulative resin material, and
the stator core outer circumferential end is abutted against a recession axial end.
13. The fluid pump according to claim 8, wherein the housing is formed of metal.
14. A fluid pump as in claim 8, wherein:
said housing includes a pump housing portion, an intermediate housing portion, and a motor housing portion,
wherein the pump housing portion circumferentially surrounds a pump portion outer circumferential periphery,
the motor housing portion circumferentially surrounds a stator core outer circumferential periphery,
the intermediate housing portion is interposed axially between the pump housing portion and the motor housing portion,
wherein an intermediate housing portion inner diameter is less than a pump housing portion inner diameter, and
the intermediate housing portion inner diameter is less than a motor housing portion inner diameter.
15. A fluid pump comprising:
a stator core having a stator core inner circumferential periphery;
a plurality of coils that are respectively wound around the stator core, the plurality of coils circumferentially generating magnetic poles in the stator core inner circumferential periphery when being supplied with electricity, the magnetic poles being switched by controlling electricity supplied to the plurality of coils;
a rotator that is rotatable within the stator core inner circumferential periphery, the rotator having a rotator outer circumferential periphery opposed to the stator core inner circumferential periphery, the rotator outer circumferential periphery defining magnetic poles different from each other with respect to a rotative direction of the rotator;
a pump portion that has a rotor member, the rotator being adapted to rotate the rotor member for pumping fuel;
a housing that has a housing inner circumferential periphery defining a recession, which accommodates the stator core;
a plurality of terminals that electrically respectively connect with the plurality of coils,
wherein the stator core, the plurality of coils, and the plurality of terminals are insert-molded with an electrically insulative resin material,
the plurality of terminals are partially exposed outside of the electrically insulative resin material, and
the stator core has a stator core first axial end defining a stator core outer circumferential end that is at least partially not exposed to the electrically insulative resin material;
wherein the stator core first axial end is located on the stator core on a stator core first side that is proximate to the pump portion,
the electrically insulative resin material defines a cover member that covers a stator core second side that is axially opposite to the stator core first side,
the cover member has a cover outer circumferential periphery that defines a fuel seal by making contact with the housing inner circumferential periphery, and
wherein the stator core outer circumferential periphery, the housing inner circumferential periphery, and the cover outer circumferential periphery define a contact portion, and
the contact portion and a portion of the stator core outer circumferential end abutted against a recession axial end define a space.
16. A fluid pump comprising:
a stator core having a stator core inner circumferential periphery;
a plurality of coils that are respectively wound around the stator core, the plurality of coils circumferentially generating magnetic poles in the stator core inner circumferential periphery when being supplied with electricity, the magnetic poles being switched by controlling electricity supplied to the plurality of coils;
a rotator that is rotatable within the stator core inner circumferential periphery, the rotator having a rotator outer circumferential periphery opposed to the stator core inner circumferential periphery, the rotator outer circumferential periphery defining magnetic poles different from each other with respect to a rotative direction of the rotator;
a pump portion that has a rotor member, the rotator being adapted to rotate the rotor member for pumping fuel;
a housing that has a housing inner circumferential periphery defining a recession, which accommodates the stator core;
a plurality of terminals that electrically respectively connect with the plurality of coils,
wherein the stator core, the plurality of coils, and the plurality of terminals are insert-molded with an electrically insulative resin material,
the plurality of terminals are partially exposed outside of the electrically insulative resin material, and
the stator core has a stator core first axial end defining a stator core outer circumferential end that is at least partially not exposed to the electrically insulative resin material;
wherein the stator core includes a plurality of teeth that are separate from each other,
the plurality of teeth are circumferentially arranged,
the plurality of coils are respectively wound around the plurality of teeth,
each of the plurality of teeth has an outer circumferential periphery that defines a groove, which extends axially, and
the electrically insulative resin material is charged into the groove.