1. A permanent magnet type rotating electrical machine comprising:
a housing;
a stator provided in the housing and having a stator core formed into a cylindrical shape and a stator coil provided on the stator core; and
a rotor provided at an inner circumferential side of the stator and having a rotor core formed into a cylindrical shape, permanent magnets provided in the rotor core and a rotating shaft member provided so as to be coaxial with the housing, wherein:
the rotor core has a plurality of groups of magnet holes which are circumferentially arranged at regular intervals thereby to form magnetic barriers respectively;
each group includes a pair of first magnet holes which are symmetric with respect to an imaginary line extending through a center of the rotor core radially outward and a pair of second magnet holes which are located on a radially inner side of the rotor core than the corresponding pair of the first magnet holes and are symmetric with respect to the imaginary line;
each pair of first magnet holes are disposed so that a distance from each pair of the first magnet holes to the imaginary line is rendered longer as each pair of the first magnet holes come close to an outer circumference of the rotor core;
each pair of the second magnet holes are located on an inner circumferential side than the corresponding pair of the first magnet holes with respect to a radial direction of the rotor core;
each pair of the second magnet holes are disposed so that a distance from each pair of the second magnet holes to the imaginary line is rendered longer as each pair of the second magnet holes come close to the outer circumference of the rotor core; and
a first magnet angle made by the permanent magnets provided in each pair of the first magnet holes is larger than a second magnet angle made by the permanent magnets provided in each pair of the second magnet holes.
2. The machine according to claim 1, wherein the first magnet angle ranges from 142\xb0 to 166\xb0 in a mechanical angle.
3. The machine according to claim 1, wherein:
each pair of the first magnet holes have respective ends that are located at an outer circumferential side of the rotor core and are formed along an outer circumferential edge of the rotor core, and first outer circumferential side bridge portions formed between the outer circumferential edge of the rotor core and the outer circumferential side ends of each pair of the first magnet holes respectively; and
a first pole angle ranges from 12.4\xb0 to 14.8\xb0 in an electrical angle where the first pole angle is made by lines between the center of the rotor core and first proximal points that are intersections of first circumferential imaginary lines obtained by circumferentially extending outer circumferential ends of each pair of the first magnet holes and first radial imaginary lines obtained by radially extending ends of each pair of the first magnet holes, respectively.
4. The machine according to claim 2, wherein:
each pair of the first magnet holes have respective ends that are located at an outer circumferential side of the rotor core and are formed along an outer circumferential edge of the rotor core, and first outer circumferential side bridge portions formed between the outer circumferential edge of the rotor core and the outer circumferential side ends of each pair of the first magnet holes respectively; and
a first pole angle ranges from 12.4\xb0 to 14.8\xb0 in an electrical angle where the first pole angle is made by lines between the center of the rotor core and first proximal points that are intersections of first circumferential imaginary lines obtained by circumferentially extending outer circumferential ends of each pair of the first magnet holes and first radial imaginary lines obtained by radially extending ends of each pair of the first magnet holes, respectively.
5. The machine according to claim 1, wherein:
each pair of the second magnet holes have ends that are located at an outer circumferential side of the rotor core and are formed substantially along an or the outer edge of the rotor core, and second outer circumferential side bridge portions formed between an or the outer edge of the rotor core and the outer circumferential side ends of each pair of the second magnet holes respectively; and
a second pole angle ranges from 29.2\xb0 to 30.8\xb0 in electrical angle where the second pole angle is made by lines between the center of the rotor core and second proximal points that are intersections of second circumferential imaginary lines obtained by circumferentially extending outer circumferential ends of each pair of the second magnet holes and second radial imaginary lines obtained by radially extending ends of each pair of the second magnet holes.
6. The machine according to claim 2, wherein:
each pair of the second magnet holes have ends that are located at an outer circumferential side of the rotor core and are formed substantially along an or the outer edge of the rotor core, and second outer circumferential side bridge portions formed between an or the outer edge of the rotor core and the outer circumferential side ends of each pair of the second magnet holes respectively; and
a second pole angle ranges from 29.2\xb0 to 30.8\xb0 in electrical angle where the second pole angle is made by lines between the center of the rotor core and second proximal points that are intersections of second circumferential imaginary lines obtained by circumferentially extending outer circumferential ends of each pair of the second magnet holes and second radial imaginary lines obtained by radially extending ends of each pair of the second magnet holes.
7. The machine according to claim 3, wherein:
each pair of the second magnet holes have ends that are located at an outer circumferential side of the rotor core and are formed substantially along an or the outer edge of the rotor core, and second outer circumferential side bridge portions formed between an or the outer edge of the rotor core and the outer circumferential side ends of each pair of the second magnet holes respectively; and
a second pole angle ranges from 29.2\xb0 to 30.8\xb0 in electrical angle where the second pole angle is made by lines between the center of the rotor core and second proximal points that are intersections of second circumferential imaginary lines obtained by circumferentially extending outer circumferential ends of each pair of the second magnet holes and second radial imaginary lines obtained by radially extending ends of each pair of the second magnet holes.
8. The machine according to 4, wherein:
each pair of the second magnet holes have ends that are located at an outer circumferential side of the rotor core and are formed substantially along an or the outer edge of the rotor core, and second outer circumferential side bridge portions formed between an or the outer edge of the rotor core and the outer circumferential side ends of each pair of the second magnet holes respectively; and
a second pole angle ranges from 29.2\xb0 to 30.8\xb0 in electrical angle where the second pole angle is made by lines between the center of the rotor core and second proximal points that are intersections of second circumferential imaginary lines obtained by circumferentially extending outer circumferential ends of each pair of the second magnet holes and second radial imaginary lines obtained by radially extending ends of each pair of the second magnet holes.
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. An apparatus comprising:
at least one processor; and
at least one memory including computer program code, in which the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to:
select between a first scanning mode and a second scanning mode using at least inputs of signal quality of a link with an access node and at least one of user equipment speed and network type of the access node;
determine a scanning rate using the selected scanning mode and the user equipment speed; and
detect and measure inter-frequency neighbor cells according to the determined scanning rate.
2. The apparatus according to claim 1, in which:
the first scanning mode provides an increased scanning rate for increased user equipment speeds until a first threshold speed Vt1 above which the scanning rate reduces to at or near zero regardless of user equipment speed.
3. The apparatus according to claim 2, in which:
the second scanning mode provides an increased scanning rate for increased user equipment speeds until a second threshold speed Vt2 above which the scanning rate is constant at a maximum scanning rate regardless of user equipment speed.
4. The apparatus according to claim 3, in which the at least one memory and the computer program code are configured with the at least one processor to cause the apparatus to select the second scanning mode at least when the user equipment speed is greater than the first threshold speed Vt1, and the signal quality of the link is less than a predetermined minimum signal quality.
5. The apparatus according to claim 1, in which at least the second scanning mode provides an increased scanning rate for increased user equipment speeds in dependence on network type, such that for a given increase in user equipment speed there is a greater increase in scanning rate for a small cell network type than for a large cell network type.
6. The apparatus according to claim 1, in which the inputs for selecting between the first and second scanning modes comprise the signal quality of the link, the user equipment speed, and the network type of the access node.
7. The apparatus according to claim 1, in which the at least one memory and the computer program code are configured with the at least one processor to cause the apparatus to:
select between the first scanning mode and the second scanning mode using at least inputs of the signal quality of the link and the network type;
in which the second scanning mode is selected when the network type is a small cell regardless of the signal quality of the link; and
the first scanning mode is selected when the network type is a large cell and the signal quality of the link is greater than a predetermined minimum signal quality.
8. The apparatus according to claim 1, in which the apparatus comprises the user equipment which is configured to determine the user equipment speed from at least one of:
an accelerometer disposed within the user equipment;
position and velocity data obtained from a GPS receiver disposed within the user equipment; and
variations in received signal strength between WiFi and cellular receivers disposed within the user equipment.
9. The apparatus according to claim 1, in which the user equipment speed is determined by averaging individual speed measurements over time, in which individual speed measurements characterized by a short duration and a negligible speed are excluded from the averaging.
10. A method comprising:
selecting between a first scanning mode and a second scanning mode using at least inputs of signal quality of a link with an access node and at least one of user equipment speed and network type of the access node;
determining a scanning rate using the selected scanning mode and the user equipment speed; and
detecting and measuring inter-frequency neighbor cells according to the determined scanning rate.
11. The method according to claim 10, in which:
the first scanning mode provides an increased scanning rate for increased user equipment speeds until a first threshold speed Vt1 above which the scanning rate reduces to at or near zero regardless of user equipment speed.
12. The method according to claim 11, in which:
the second scanning mode provides an increased scanning rate for increased user equipment speeds until a second threshold speed Vt2 above which the scanning rate is constant at a maximum scanning rate regardless of user equipment speed.
13. The method according to claim 12, in which the second scanning mode is selected at least when the user equipment speed is greater than the first threshold speed Vt1, and the signal quality of the link is less than a predetermined minimum signal quality.
14. The method according to claim 12, in which at least the second scanning mode provides an increased scanning rate for increased user equipment speeds in dependence on network type, such that for a given increase in user equipment speed there is a greater increase in scanning rate for a small cell network type than for a large cell network type.
15. The method according to claim 10, in which the inputs for selecting between the first and second scanning modes comprise the signal quality of the link with the access node, the user equipment speed, and the network type of the access node.
16. The method according to claim 10, in which the selecting between the first scanning mode and the second scanning mode use at least inputs of the signal quality of the link and the network type;
in which the second scanning mode is selected when the network type is a small cell regardless of the signal quality of the link; and
the first scanning mode is selected when the network type is a large cell and the signal quality of the link is greater than a predetermined minimum signal quality.
17. The method according to claim 10, in which the method is executed by the user equipment and the user equipment speed is determined from at least one of:
an accelerometer disposed within the user equipment;
position and velocity data obtained from a GPS receiver disposed within the user equipment; and
variations in received signal strength between WiFi and cellular receivers disposed within the user equipment.
18. The method according to claim 10, in which the method is executed by the user equipment and the user equipment speed is determined by averaging individual speed measurements over time, in which individual speed measurements characterized by a short duration and a zero speed are excluded from the averaging.
19. A computer readable memory storing a program of instructions comprising:
code for selecting between a first scanning mode and a second scanning mode using at least inputs of signal quality of a link with an access node and at least one of user equipment speed and network type of the access node;
code for determining a scanning rate using the selected scanning mode and the user equipment speed; and
code for detecting and measuring inter-frequency neighbor cells according to the determined scanning rate.
20. The computer readable memory according to claim 19, in which:
the first scanning mode provides an increased scanning rate for increased user equipment speeds until a first threshold speed Vt1 above which the scanning rate reduces to at or near zero regardless of user equipment speed; and
the second scanning mode provides an increased scanning rate for increased user equipment speeds until a second threshold speed Vt2 above which the scanning rate is constant at a maximum scanning rate regardless of user equipment speed.