Rotation angle detector, rotary electrical machine and elevator hoisting machine

A rotation angle detector, comprising:

• a detecting stator including a detecting stator core, a plurality of excitation coils, a plurality of first output coils, and a plurality of second output coils, which are provided respectively on the detecting stator core;
• and
• a detecting rotor including a plurality of salient poles arranged in a circumferential direction of the rotor and configured to rotate with respect to the detecting stator while the salient poles face the detecting stator in a radial direction of the rotor;
• wherein
• the first output coils and the second output coils are output coils of mutually different phases;
• the detecting stator core includes a plurality of teeth arranged in the circumferential direction;
• the excitation coils are respectively wound about the teeth;
• the first output coils and the second output coils are wound about mutually different teeth so that winding of output coils of the same phase is avoided in two teeth that are mutually adjacent in the circumferential direction;
• a number of pole pairs of the excitation coils is set to M, which is an integer no less than 1;
• a number of salient poles is set to N, which is an integer no less than 1;
• and
• when a reference state is a state wherein the plurality of first output coils include at least a first output coil having the number of windings of Ai, which is an integer no less than 1, and a first output coil having the number of windings of Aj, which is an integer no less than 0 that is smaller than Ai, and wherein the plurality of second output coils include at least a second output coil having the number of windings of Bk, which is an integer no less than 1, and a second output coil having the number of windings of Bm, which is an integer no less than 0 that is smaller than Bk, and moreover wherein a spatial distribution of the numbers of windings of the first output coils and the second output coils is obtained by a sum of a function expressed by a sine wave of spatial order |M±N| and a function expressed by a sine wave of spatial order |M−|M±N∥ having an amplitude equal to an amplitude of the sine wave of spatial order |M±N|, and when a is the integer no less than 1 and b is the integer no less than 1, then
• at least one configuration is provided from among:
• a configuration in which the numbers of windings of the first and second output coils are respectively the same numbers of windings as in the reference state, with the exception that the first output coils are wound by increasing or decreasing the number of windings by a such that the number of windings is not set to a number less than or equal to 0 without changing relative magnitudes of the number of windings on the teeth wherein the number of windings is Ai and the number of windings on the teeth wherein the number of windings is Aj, in the teeth wherein the first output coils having the number of windings of Ai or Aj are wound in the reference state;
• and
• a configuration in which the numbers of windings of the first and second output coils are respectively the same numbers of windings as in the reference state, with the exception that the second output coils are wound by increasing or decreasing the number of windings by b such that the number of windings is not set to a number less than or equal to 0 without changing relative magnitudes of the number of windings on the teeth wherein the number of windings is Bk and the number of windings on the teeth wherein the number of windings is Bm in the teeth wherein the second output coils having the number of windings of Bk or Bm are wound in the reference state.

A rotation angle detector, comprising:

• a detecting stator including a detecting stator core, a plurality of excitation coils, a plurality of first output coils, and a plurality of second output coils, which are provided respectively on the detecting stator core;
• and
• a detecting rotor including a plurality of salient poles arranged in a circumferential direction of the rotor and configured to rotate with respect to the detecting stator while the salient poles face the detecting stator in a radial direction of the rotor;
• wherein
• the first output coils and the second output coils are output coils of mutually different phases;
• the detecting stator core includes a plurality of teeth arranged in the circumferential direction;
• the excitation coils are respectively wound about the teeth;
• the first output coils and the second output coils are wound about mutually different teeth so that winding of output coils of the same phase is avoided in two teeth that are in the circumferential direction;
• a number of pole pairs of the excitation coils is set to M, which is an integer no less than 1;
• a number of salient poles is set to N, which is an integer no less than 1;
• and
• when a reference state is a state wherein the plurality of first output coils include at least a first output coil having the number of windings of Ai, which is an integer no less than 1, and a first output coil having the number of windings of Aj, which is an integer no less than 1 that is smaller than Ai, and wherein the plurality of second output coils include at least a second output coil having the number of windings of Bk, which is an integer no less than 1, and a second output coil having the number of windings of Bm, which is an integer no less than 1 that is smaller than Bk, and moreover wherein a spatial distribution of the numbers of windings of the first output coils and the second output coils is obtained by a sum of a function expressed by a sine wave of spatial order |M±N| and a function expressed by a sine wave of spatial order |M−|M±N∥ having an amplitude equal to an amplitude of the sine wave of spatial order |M±N|, and when a is an integer no less than 1 that is smaller than Aj and b is an integer no less than 1 that is smaller than Bm;
• then
• at least one configuration is provided with from among:
• a configuration in which the numbers of windings of the first and second output coils are respectively the same numbers of windings as in the reference state, with the exception that a first output coil having the number of windings of Ai±a which is greater than Aj is wound about at least any of the teeth wherein a first output coil having the number of windings of Ai is wound in the reference state, or a first output coil having the number of windings of Aj±a which is smaller than Ai is wound about at least any of the teeth wherein a first output coil having the number of windings of Aj is wound in the reference state;
• and
• a configuration in which the numbers of windings of the first and second output coils are respectively the same numbers of windings as in the reference state, with the exception that a second output coil having the number of windings of Bk±b which is greater than Bm is wound about at least any of the teeth wherein a second output coil having the number of windings of Bk is wound in the reference state, or a second output coil having the number of windings of Bm±b which is smaller than Bk is wound about at least any of the teeth wherein a second output coil having the number of windings of Bm is wound in the reference state.

A rotation angle detector, comprising:

• a detecting stator including a detecting stator core, a plurality of excitation coils, a plurality of first output coils, and a plurality second output coils, which are provided respectively on the detecting stator core;
• and
• a detecting rotor including a plurality of salient poles arranged in a circumferential direction of the rotor and configured to rotate with respect to the detecting stator while the salient poles face the detecting stator in a radial direction of the rotor;
• wherein
• the first output coils and the second output coils are output coils of mutually different phases;
• the detecting stator core includes a plurality of teeth arranged in the circumferential direction;
• the excitation coils are respectively wound about the teeth;
• the first output coils and the second output coils are wound about mutually different teeth so that winding of output coils of the same phase is avoided in two teeth that are mutually adjacent in the circumferential direction;
• a number of pole pairs of the excitation coils is M, which is an integer no less than 1;
• a number of salient poles is set to N, which is an integer no less than 1;
• and
• when a reference state is a state wherein the plurality of first output coils include at least a first output coil having the number of windings of Ai, which is an integer no less than 1, and a first output coil having the number of windings of Aj, which is an integer that is smaller than Ai, and wherein the plurality of second output coils include at least a second output coil having the number of windings of Bk, which is an integer no less than 1, and a second output coil having the number of windings of Bm, which is an integer that is smaller than Bk, and moreover wherein a spatial distribution of the numbers of windings of the first output coils and the second output coils is obtained by a sum of a function expressed by a sine wave of spatial order |M±N| and a function expressed by a sine wave of spatial order |M−|M±N∥ having an amplitude equal to an amplitude of the sine wave of spatial order |M±N|;
• then
• at least one configuration is provided from among:
• a configuration in which the numbers of windings of the first and second output coils are respectively the same numbers of windings as in the reference state, with the exception that a first output coil having the number of windings of a, which is an integer no less than 1, is wound about at least any of the teeth wherein a first output coil having the number of windings of Aj=0 is wound in the reference state;
• and
• a configuration in which the numbers of windings of the first and second output coils are respectively the same numbers of windings as in the reference state, with the exception that a second output coil having the number of windings of b, which is an integer no less than 1, is wound about at least any of the teeth wherein a second output coil having the number of windings of Bm=0 is wound in the reference state.