JP2013118774A - Resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, although it is necessary to switch a winding direction between CCW and CW directions in order to output a sinusoidal wave, in a conventional winding method, a winding wire less than one turn is lacked and an output voltage is unbalanced between (+) side and (-) side and in a method for canceling unbalancing of the output voltage between the (+) side and the (-) side by alternately pulling the winding wire around teeth according to the conventional method, since the winding wire is wound around the teeth excessively, the winding wire is wound more than the number of winding in a sinusoidal wave shape, distortion of the output voltage is enlarged and an error in angle detection is enlarged.SOLUTION: A protrusion is provided in addition to a protrusion for pulling a winding wire around teeth, a winding wire for 1/4 turn is added in a CCW direction and pulled around the protrusion, without making the number of winding of sin cos output voltage more or less than the number of winding to provide a sinusoidal wave shape, unbalancing between the (+) side and the (-) side can be canceled, and an error in angle detection can be reduced.

Description

  The present invention relates to a winding structure of a resolver stator.

  As a conventional method of winding a resolver stator, for example, there is a method described in Patent Document 1. In each slot, an output winding wound in the CCW direction and an output winding wound in the CW direction are wound next to the output winding in the CCW direction and the output winding in the CW direction. The windings are alternately wound, and as a guide for windings between adjacent slots, the guides are alternately guided by winding the windings around the protruding guides formed on the upper and lower surfaces of the insulator between the slots. This is the configuration. Due to the difference in the winding direction between the CCW direction and the CW direction, a positive voltage and a negative voltage are output as output voltages.

  Further, the winding method described in Patent Document 2 does not require an additional part, and adjusts the length of the winding wire only by the winding method of the slot. Half of the crossover lines are opposite to each other along the circumferential direction of the stator core, and the total length is the same.

JP 2007-327869 A JP 2010-63309 A

  However, the conventional configuration has the following problems.

  For example, in the winding method described in Patent Document 1, this type of rotation detector, in principle, needs to change the amplitude value of the output signal in accordance with the rotation angle. It is necessary to change the number of turns in a sinusoidal shape and change the winding direction in the CW or CCW direction.

  In addition, in order to make the positive and negative amplitudes of the output signal coincide with each other, each tooth is wound with an extra ½ turn, and the winding is alternately drawn from the top and bottom surfaces of the insulator. Becomes larger than the number of turns in a sine wave shape, and the waveform of the output signal is distorted from the sine wave, which causes a large error in angle detection.

  Furthermore, for the ring-shaped stator core, since it is necessary to route the winding alternately from the top and bottom surfaces of the insulator, during the winding work, while making the stator core or the winding nozzle move in a complex manner, Since it is necessary to wind the winding, the number of winding steps also becomes a big problem.

  In the winding method described in Patent Document 2, in the case of an output winding in the CCW direction, the winding is wound until the last one turn has crossed the line on the upper surface of the insulator. In the case of a line, the last one turn cannot be wound until the line crosses, resulting in a shortage of 1/4 turn.

Therefore, in the output winding in the CCW direction and the output winding in the CW direction, even if the same number of turns is wound, a difference occurs as the output voltage, so the same amplitude value is not obtained on the + side and the − side of the output voltage. Since the sine wave shape collapses, it is difficult to improve the accuracy at the time of angle detection.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a resolver winding structure in which the number of turns of a sin output signal and a cos output signal can be wound without excess or deficiency with respect to a predetermined number of turns of a sine wave shape.

  In order to solve the above-described conventional problems, the winding method of the stator for a rotation detector according to the present invention is generally ring-shaped, and a plurality of windings are arranged at regular intervals in the circumferential direction and protrude to either the inner diameter side or the outer diameter side. The first output winding wound in the slot formed by the magnetic pole and the second output winding having a phase difference of 90 degrees with respect to the first output winding are wound around the stator core having the magnetic pole. . The number of turns N1 (s) of the first output winding and the number of turns N2 (s) of the second output winding are distributed sinusoidally with respect to the slots. To make the output signal sinusoidal, the output voltage on the + side and the output voltage on the-side are connected in series by changing the winding direction of the winding in the CW direction and CCW direction. ing.

  Thus, in order to make the output voltage on the + side and the output voltage on the − side the same, a winding having a quarter turn shortage in the last turn winding on the top surface of the insulator in the CW direction or the CCW direction is added, The + side and the − side of the output signals of sin and cos can be made the same shape.

The winding to which the 1/4 turn is added is configured to be routed so as to be folded back to the insulator projection provided separately from the insulator projection that is routed between the teeth.
Therefore, the output turns of the sin output signal and the cos output signal can be wound without excess or deficiency with respect to the predetermined number of turns of the sine wave, and the + side and the − side of the output signals of sin and cos are made the same shape. Therefore, variation in the angle signal generated by the sin output signal and the cos output signal can be reduced, and the accuracy of the detected angle can be improved.

  Since the resolver of the present invention can wind the output turns of the sin output signal and the cos output signal without excess or deficiency with respect to the predetermined number of turns of the sine wave shape, the resolver of the angle signal generated by the sin output signal and the cos output signal Variations can be reduced and the accuracy of the detection angle can be improved.

Configuration diagram of winding method of stator for rotation detector according to embodiment 1 of the present invention Configuration diagram of winding method of stator for rotation detector of conventional example 1 Configuration diagram of winding method of stator for rotation detector of conventional example 2

  Hereinafter, a method of winding a stator for a rotation detector according to the present invention will be described with reference to preferred embodiments.

(Embodiment 1)
FIG. 1 shows a winding diagram of the rotation detector stator according to the first embodiment of the present invention. As shown in FIG. 1, the rotation detector stator according to the first embodiment of the present invention includes a stator core 1, an insulator 2, a winding lead projection 3, and a winding 4.

The stator core 1 has a ring shape as a whole, and includes a plurality of magnetic poles arranged at regular intervals in the circumferential direction and protruding to either the inner diameter side or the outer diameter side. The winding 4 is wound around a slot formed by a magnetic pole. The insulator 2 is installed so as to cover the stator core 1 from both axial end surfaces, and electrically insulates the stator core 1 and the winding 4.

  Although details of the windings are omitted in FIG. 1, the windings generate an output winding 5 (sin output) and an output signal A that generate a sinusoidal output signal A (sin output signal) according to the rotation angle. The output winding 6 (cos output) generates a sinusoidal output signal B (cos output signal) that is 90 degrees out of phase. In the output winding 5 and the output winding 6, the number of turns is distributed in a sine wave form for each slot so that the output signal A and the output signal B are generated.

  In FIG. 1, in the final winding of the output winding 5 and the output winding 6, the winding is routed separately from the winding routing protrusion between the teeth so that the winding is arranged on the top surface of the insulator. The protrusion 3 is provided, and the winding is disposed so as to be folded back through the protrusion.

  That is, as in the winding diagram shown in FIG. 2, the windings are arranged on the top surface of the insulator, and the windings 4 in the CW direction are the same as the windings in the CCW direction without excess or deficiency, and the output signal A, output The amplitude value of the positive side voltage of the signal B and the amplitude value of the negative side voltage can be made the same, and an error during angle detection can be reduced.

  Therefore, the winding 4 is ¼ on the top surface of the insulator in the final winding 4 of the output winding 5 and the output winding 6 that caused an error in angle detection by the conventional winding method shown in FIG. It is possible to eliminate the amplitude difference between the amplitude of the + side voltage and the amplitude of the − side voltage of the output signal A and the output signal B due to the shortage of turns.

  As described above, the resolver according to the present invention can wind the sin and cos output voltage with the number of turns of a sinusoidal shape, and can eliminate the unbalance between the + side and the − side. The error at the time of detection can be reduced, and it can be applied to advanced position detection such as position detection of a servo motor used for industrial use.

DESCRIPTION OF SYMBOLS 1 Stator core 2 Insulator 3 Winding routing protrusion 4 Winding 5, 6 Output winding

Claims (1)

A plurality of teeth are arranged in a stator core laminated in the axial direction, and each of the teeth is a stator in which two output windings for sin signal output and cos signal output are wound, The sin signal and the cos signal have a winding method in which the number of turns and the winding direction are changed for each tooth so that a sinusoidal output is obtained, and the output winding is a 1/4 turn winding caused by a difference in winding direction. The resolver is characterized in that the additional winding and the 1/4 turn are routed through a projection different from the routing projection between the teeth.