JP6406114B2 - Brushless motor - Google Patents

Description

  The present invention relates to a brushless motor, and more particularly to a brushless motor capable of detecting the rotational position of a rotor.

  2. Description of the Related Art In recent years, some gaming machines such as pachinko machines are equipped with a movable accessory for production that is movable in the gaming machine. Such control of the movable accessory is performed based on the position detection of the rotor of the accessory driving motor that moves the movable accessory.

  Conventionally, optical encoders and magnetic encoders are known as methods for detecting the position of a rotor in a motor.

  For example, in Patent Document 1, a Hall element is provided between the stators, and the position of the rotor is detected in accordance with a change in magnetic flux detected by the Hall element so that the electronic circuit on the circuit board has the maximum torque. A brushless motor that controls energization of a drive coil is disclosed.

JP 61-112563 A (published May 30, 1986)

  By the way, as a motor for driving an accessory in a gaming machine, a motor that can detect the position of the rotor in detail is desired. This is because the movable accessory is stopped at a predetermined position, the direction of rotation is switched at a predetermined position, or is moved slowly at a low speed without uneven speed.

  In order to detect the position of the rotor finely, it is conceivable to mount a magnetic encoder or optical encoder with high resolution. However, these are expensive and have a large number of parts, so they become large when incorporated in a motor.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a brushless motor that is small and inexpensive and has a high position detection resolution.

  The brushless motor according to the present invention detects a rotational position of a rotor provided with a magnet by a Hall element disposed between magnetic poles of a stator provided with a gap with respect to the rotor, and is wound around the magnetic pole. 1 is a brushless motor for controlling the current to the drive coil, and is arranged at N different electrical angles according to N (N is an integer of 2 or more) phase current applied to each drive coil. A hall element and a first signal generation unit that generates a second signal having an electrical angle phase different from that of the N first signals output from the N first hall elements.

  Furthermore, in the brushless motor according to the present invention, the first signal generator is located between the magnetic poles, at a position where the electrical angle is equal to the first Hall element and the mechanical angle is different from the first Hall element. It may be at least one second Hall element provided so that the magnetic sensing directions are different.

  Alternatively, in the brushless motor according to the present invention, the first signal generation unit may generate the second signal using the N first signals.

  According to the above configuration, N signals are output from the first Hall element, and the second signal is generated from the first signal generation unit, so that the first signal and the second signal are in phase with each other. Different signals can be obtained. Therefore, the resolution for detecting the position of the rotor is increased, and the position of the rotor can be detected finely.

  In addition, since the resolution of position detection is increased using the first signal and the second signal, it is not necessary to mount large parts with high resolution, and thus the brushless motor can be reduced in size. For example, when the second Hall element is used as the first signal generation unit, the second Hall element can be disposed between the magnetic poles of the stator, so that the brushless motor does not increase in size.

  Further, as the first signal generation unit required for increasing the resolution of detecting the position of the rotor, for example, a first signal generation for performing a process of generating a second signal using the Hall element or the first signal is used. The brushless motor can be provided at a low cost.

  Furthermore, in the brushless motor according to the present invention, N = 3, and three second Hall elements are provided, and the first Hall element is arranged such that a magnetic sensitive direction faces a radial direction of the rotor. The second Hall element may be arranged such that a magnetic sensitive direction faces a circumferential direction of the rotor.

  According to the above configuration, it is possible to output signals having a phase difference of 90 degrees between the first Hall element and the second Hall element. Therefore, six signals having different phases can be easily obtained from the first Hall element and the second Hall element.

  Furthermore, in the brushless motor according to the present invention, the N first signals and the second signals are different in electrical angle phase by using at least two signals of the N first signals and the second signals. You may provide the 2nd signal production | generation part which produces | generates a 3rd signal.

  According to the above configuration, the second signal generation unit generates the third signal using the N first signals output from the first Hall element and the second signal output from the second Hall element. By doing so, it is possible to provide a brushless motor with higher position detection resolution.

  The present invention can provide a brushless motor that is small and inexpensive and has high position detection resolution.

It is the schematic which shows the structure of the brushless motor which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between the output signal of a Hall element with which the brushless motor shown in FIG. 1 is provided, and an electrical angle. It is the schematic which shows the structure of the signal processing part with which the brushless motor shown in FIG. 1 is provided. In the brushless motor shown in FIG. 1, it is a figure which shows the relationship between the output signal of a Hall element, a position signal, a direction signal, and an electrical angle. It is the schematic which shows the structure of the brushless motor which concerns on the modification of Embodiment 1. (A) is the schematic which shows the structure of the brushless motor which concerns on Embodiment 2, (b) is the schematic which shows the structure of the signal processing part with which the brushless motor shown in (a) is provided. FIG. 7 is a diagram showing a relationship between an output signal, a position signal, a direction signal, and an electrical angle of a Hall element in the brushless motor shown in FIG. It is the schematic which shows the structure of the signal processing part with which the brushless motor which concerns on the modification of Embodiment 2 is provided. (A) is schematic which shows the structure of the brushless motor used conventionally, (b) is schematic which shows the structure of the signal processing part with which the brushless motor shown to (a) is provided. In the brushless motor shown in FIG. 9, it is a figure which shows the relationship between the output signal of a Hall element, a position signal, a direction signal, and an electrical angle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1
(Brushless motor configuration)
FIG. 1 is a schematic diagram illustrating a configuration of a brushless motor 100 according to the present embodiment. The brushless motor 100 according to the present embodiment is an outer rotor type brushless motor, and includes a rotor magnet (rotor) 1, a stator 2, a signal processing unit 10 (see FIG. 3), and a control unit 15 (see FIG. 3). With.

  The rotor magnet 1 is a ring-shaped permanent magnet having eight (four pairs) poles. The stator 2 includes six coils (drive coils) 3 wound around the stator magnetic poles and six hall elements 4. The rotor magnet 1 and the stator 2 are arranged on a concentric circle with the rotation axis of the brushless motor 100 as a center so as to be opposed to each other in the circumferential direction, and the rotor magnet 1 is arranged radially outside of the stator 2. The

  The six coils 3 are arranged at equal intervals in the circumferential direction. Therefore, the angle formed by adjacent coils is 60 degrees. Each of the six coils 3 is controlled so that the current flowing by the control unit 15 is controlled so that an equal current flows in the coil 3 that is in a point-symmetrical position with respect to the rotation axis.

  The six Hall elements 4 are respectively disposed at intermediate positions (between magnetic poles) of the six coils 3. The six Hall elements detect the magnetism, and the first to third radial Hall elements (first Hall elements) 4a to 4c, in which the magnetic detection direction (magnetic sensing direction) is arranged in the radial direction. The first to third circumferential Hall elements (first signal generation unit, second Hall element) 4d to 4f are arranged in a circumferential direction. In the brushless motor 100 according to the present embodiment, the first radial hall element 4a, the second radial hall element 4b, the third radial hall element 4c, the first circumferential hall element 4d, and the second circumferential hall element 4e. The third circumferential hall elements 4f are arranged at mechanical angle intervals of 60 degrees so that they are arranged in this order in the clockwise direction.

  Further, an output signal Hur (first signal) is output from the first radial hall element 4a, an output signal Hvr (first signal) is output from the second radial hall element 4b, and an output from the third radial hall element 4c. The signal is Hwr (first signal), the output signal from the first circumferential hall element 4d is Huc (second signal), the output signal from the second circumferential hall element 4e is Hvc (second signal), The third circumferential hall element 4f outputs an output signal Hwc (second signal).

  FIG. 2 is a diagram showing the relationship between the outputs of the six Hall elements 4 and the electrical angles. As can be seen from FIG. 2, the output signal Hur of the first radial Hall element 4a, the output signal Hvr of the second radial Hall element 4b, and the output signal Hwr of the third radial Hall element 4c have a phase of 120. Different waveforms are shown. Similarly, the output signal Huc of the first circumferential hall element 4d, the output signal Hvc of the second circumferential hall element 4e, and the output signal Hwc of the third circumferential hall element 4f are different in phase by 120 degrees. Indicates. In other words, in the brushless motor 100 according to the present embodiment, the Hall element 4 located at a position 60 degrees away from the mechanical angle outputs waveforms having a phase difference of 120 degrees at the electrical angle.

  Further, as shown in FIG. 2, the output signals Hur of the first radial Hall element 4a and the first circumferential Hall element 4d, which are in a point-symmetrical position with respect to the rotation axis, that is, an equivalent position in terms of electrical angle, are provided. And Huc indicate waveforms whose phases differ by 90 degrees in electrical angle. Similarly, the output signals of the second radial hall element 4b and the second circumferential hall element 4e, and the output signals of the third radial hall element 4c and the third circumferential hall element 4f are also waveforms whose phases are 90 degrees different from each other in electrical angle. Indicates.

  FIG. 3 is a schematic diagram illustrating a configuration of the signal processing unit 10 that processes output signals output from the six Hall elements 4. As shown in FIG. 3, the output signals output from the six Hall elements 4 are respectively input to the logic circuit 12 via the operational amplifier 11. The logic circuit 12 includes a direction discrimination circuit 13. The logic circuit 12 converts the output signals Hur, Hvr, Hwr, Huc, Hvc, and Hwc (hereinafter abbreviated as Hur to Hwc) of the Hall element 4 input from the operational amplifier 11 into rectangular waves. Then, the logic circuit 12 synthesizes the output signals Hur to Hwc converted into rectangular waves, and outputs a position signal PP1 indicating the rotational position of the rotor magnet 1 to the control unit 15. The direction discriminating circuit 13 outputs a direction signal DIR1 indicating the rotation direction of the rotor magnet 1 to the control unit 15 based on the output signals Hur to Hwc converted into rectangular waves.

  FIG. 4 is a schematic diagram illustrating an example of the output signals Hur to Hwc converted into rectangular waves by the logic circuit 12, and the position signal PP1 and the direction signal DIR1 output to the control unit 15. Shows the relationship. It should be noted that the rotational direction of the rotor magnet 1 is reversed at the position marked “reverse” in FIG.

  As shown in FIG. 4, the position signal PP1 is a signal having a rise or fall of a pulse at the same electrical angle as the rise and fall of the output signals Hur to Hwc. Further, the direction signal DIR1 is determined by comparing the permutation of the rise and fall of the pulses of the output signals Hur to Hwc. Therefore, the rotation direction of the rotor magnet 1 is reversed, and the direction signal DIR1 is changed at the position where the falling and falling of the pulses of the output signals Hur to Hwc are detected.

  The control unit 15 detects the rotational position and the rotational direction of the rotor magnet 1 based on the position signal PP and the direction signal DIR1 input from the logic circuit 12, and controls the operation of each unit of the brushless motor 100.

(Contrast with conventional technology)
Next, the effect of this embodiment will be described.

  9A is a schematic diagram showing the structure of a conventionally used brushless motor 200, and FIG. 9B is a schematic diagram showing the configuration of a signal processing unit 210 provided in the brushless motor 200. As shown in FIG. The brushless motor 200 is the implementation shown in FIG. 1 except that the brushless motor 200 does not include the first to third circumferential hall elements 4d to 4f and the signal processing unit 210 is different from the signal processing unit 10. The brushless motor 100 according to the first embodiment has substantially the same structure. Therefore, in the following, for convenience of explanation, members having the same functions as those described above are denoted by the same reference numerals and description thereof is omitted.

  The signal processing unit 210 includes three operational amplifiers 11 and a logic circuit 12 having a direction discrimination circuit 13. The logic circuit 12 receives output signals Hur, Hvr, and Hwr (hereinafter abbreviated as Hur to Hwr) output from the first to third radial Hall elements 4a to 4c, and the input output signals Hur to Hwr. Is converted to a square wave. Then, the logic circuit 12 generates a position signal PP2 indicating the rotation position of the rotor magnet 1 and a direction signal DIR2 indicating the rotation direction of the rotor magnet 1 based on the output signals Hur to Hwr converted into rectangular waves. The position signal PP2 and the direction signal DIR2 are output to the control unit 15.

  FIG. 10 is a diagram illustrating an example of output signals Hur to Hwr of the first to third radial hall elements 4a to 4c, a position signal PP2, and a direction signal DIR2 in a brushless motor 200 that has been conventionally used.

  As shown in FIG. 10, the position signal PP2 in the conventionally used brushless motor 200 is similar to the position signal PP1 (see FIG. 4) of the brushless motor 100 according to the first embodiment. It is a signal having the rise or fall of the pulse at the same electrical angle as the rise and fall of the Hwr pulse. Similarly to the direction signal DIR1 of the brushless motor 100 according to the present embodiment, the direction signal DIR2 is determined by comparing the rising and falling permutations of the pulses of the output signals Hur to Hwr.

  Here, comparing FIG. 4 with FIG. 10, the position signal PP2 in the brushless motor 200 used in the related art has six rises and falls of the pulse per 360 electrical degrees. This means that there are 24 pulse rises and falls per rotation of the rotor magnet 1 (mechanical angle 360 degrees). On the other hand, the position signal PP1 of the brushless motor 100 according to the present embodiment has 12 rising and falling pulses per electrical angle of 360 degrees. This means that there are 48 rising and falling pulses per rotation of the rotor magnet 1 (mechanical angle 360 degrees). That is, the brushless motor 100 according to the present embodiment has a higher resolution for detecting the rotational position of the rotor magnet 1 (twice the resolution) than the conventionally used brushless motor 200, and detects the position of the rotor magnet 1 in detail. Is possible. Therefore, in the brushless motor 100 according to the present embodiment, the rotor magnet 1 can be rotated at a low speed without speed unevenness.

  Further, as can be seen from a comparison between the direction signal DIR1 in the brushless motor 100 and the direction signal DIR2 in the brushless motor 200, the output signal Hur is output from the brushless motor 100 even if the timing of switching the rotation direction of the rotor magnet 1 is the same. Output signal Hvc rises, and it can be detected that the rotation direction of the rotor magnet 1 is reversed by the rise of the output signal Hvc. That is, it can be said that the brushless motor 100 according to the present embodiment has higher resolution for detecting the rotational direction of the rotor magnet 1 than the conventionally used brushless motor 200, as in the case of the position signal.

  Next, in the conventionally used brushless motor 200, a case where the Hall element 4 is added in order to increase the resolution of position detection of the rotor magnet 1 will be considered. In order not to increase the size of the brushless motor 200, it is necessary to dispose the Hall element 4 between dead coils, that is, between the six coils 3 in the stator 2. Therefore, the position where the hall element 4 can be arranged is limited to the position where the first to third circumferential hall elements 4 d to 4 f are arranged in the brushless motor 100. However, as described above, the point-symmetrical position with respect to the rotation axis is the position where the electrical angle is equal, and therefore the position where the first to third circumferential hall elements 4d to 4f are arranged in the brushless motor 100. When the radial hall element is added to the rotor magnet 1, the position detection of the rotor magnet 1 does not contribute to high resolution.

  On the other hand, in the brushless motor 100 according to the first embodiment, the Hall element 4 is disposed at a position where the electrical angle is equal in a state in which the Hall element 4 is rotated 90 degrees, and the angle for detecting magnetism is set in two directions, the circumferential direction and the radial direction. By doing so, output signals having different phases can be extracted even at the same electrical angle. Therefore, the brushless motor 100 according to the present embodiment can increase the resolution of the position detection and the rotation direction detection of the rotor magnet 1 without increasing the size of the brushless motor 200 used conventionally.

  Further, since the accuracy of increasing the resolution depends only on the mechanical position where the Hall element 4 is provided, it is possible to increase the resolution with high accuracy. Furthermore, only a simple logic circuit 12 is necessary for high resolution, and high resolution can be realized at low cost. Here, for example, when considering a case where signals having different phases are generated by an electrical method to increase the resolution, when noise is mixed in the output signal of the Hall element 4, the signal is generated based on the output signal. Noise is also mixed in the signal, and the noise is superimposed. On the other hand, the brushless motor 100 according to the present embodiment outputs signals with different phases from the Hall elements 4, and thus is less susceptible to noise and can perform accurate position detection.

  In the present embodiment, the first to third radial hall elements 4a to 4c and the first to third circumferential hall elements 4d to 4f are arranged at positions having the same electrical angle and different mechanical angles. Although the brushless motor 100 is described, the first to third radial hall elements 4a to 4c and the first to third circumferential hall elements 4d to 4f may be provided at the same electrical angle. That's fine. In other words, the first to third radial hall elements 4a to 4c and the first to third circumferential hall elements 4d to 4f may have the same electrical angle and the same mechanical angle. That is, a configuration in which a circumferential hall element and a radial hall element are provided at one place between the coils 3 may be employed.

(Modification)
Next, a modified example of the brushless motor 100 according to the present embodiment will be described.

  FIG. 5 is a schematic diagram showing the configuration of the brushless motor 101 according to this modification. A brushless motor 101 according to this modification includes a rotor magnet 1 ′ having 16 poles and a stator 2 ′ having 12 coils 3. In addition, Hall elements 4 are arranged at intermediate positions of the twelve coils 3, respectively.

  In FIG. 5, the magnetic sensitive direction of each Hall element 4 is indicated by an arrow. As shown in FIG. 5, the brushless motor 101 includes three radial Hall elements 4 a to 4 c that are arranged with the magnetic sensing direction facing the radial direction, and a magnetic sensing direction that is arranged with the circumferential direction 3. In addition to the four circumferential hall elements 4d to 4f, three hall elements 4g to 4i in which the radial hall elements are rotated 45 degrees clockwise, and the radial hall elements are rotated 45 degrees counterclockwise. And three Hall elements 4j to 4l arranged in the same manner. In addition, the Hall elements 4 arranged so that the magnetosensitive directions face the same direction are arranged at positions where the electrical angles are different by 120 degrees.

  Compared with the brushless motor 100 according to the first embodiment, the brushless motor 101 according to this modification further includes six Hall elements 4 in which the direction of magnetic sensitivity is changed. As a result, in the brushless motor 101, the position signal indicating the rotational position of the rotor magnet 1 'has 24 rise and fall pulses per electrical angle of 360 degrees. This means that the pulse rises and falls 192 times per rotation (mechanical angle 360 degrees) of the rotor magnet 1 '. As described above, when the number of poles of the stator, that is, when there are more than six slots between the coils 3, the Hall element 4 is arranged in the slot by changing the magnetic sensing direction of the Hall element 4. Further, the position detection and the rotation direction detection of the rotor magnet 1 can be further improved in resolution.

  In the present embodiment, the brushless motor 100 driven with a three-phase current has been described. However, the present invention is not limited to this, and the brushless motor 100 may be driven with an N-phase (N is an integer of 2 or more) current. When the brushless motor is driven with an N-phase current, N radial hall elements are provided, and the N radial hall elements generate an output signal having an electrical angle phase different from that of the N radial hall elements. It is only necessary to include N Hall elements that are arranged with the magnetic direction different from that of the radial Hall elements. With such a configuration, 2N output signals having different electrical angle phases can be generated, and the rotational position detection and the rotational direction detection of the rotor magnet 1 can be improved in resolution.

[Embodiment 2]
Another embodiment of the present invention will be described with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 6A is a schematic diagram illustrating the structure of the brushless motor 102 according to the present embodiment, and FIG. 6B is a schematic diagram illustrating the configuration of the signal processing unit 20 included in the brushless motor 102.

  The brushless motor 101 according to the present embodiment is not illustrated except that it does not include the first to third circumferential hall elements 4d to 4f and a signal processing unit 20 different from the signal processing unit 10. 1 has substantially the same structure as the brushless motor 100 according to the first embodiment shown in FIG.

  The signal processing unit 20 includes three operational amplifiers 21, first to third comparators (first signal generation units) 22 a to 22 c, and a logic circuit 12. Output signals Hur to Hwr of the first to third radial hall elements 4a to 4c are input to the three operational amplifiers 21, respectively. Output signals Hur to Hwr output from the operational amplifier 21 are input to the logic circuit 12 and the first to third comparators 22a to 22c.

  The first comparator 22a receives the output signal Hur at the + terminal and the output signal Hvr at the-terminal. Therefore, from the first comparator 22a, an output signal Hur-Hvr (second signal) having a rise and fall of a pulse at an electrical angle at which the magnitude of the output signal Hur and the output signal Hvr is switched is input to the logic circuit 12. Is done. Similarly, in the second comparator 22b, the output signal Hvr is input to the + terminal, the output signal Hwr is input to the − terminal, and the electrical angle at which the magnitude of the output signal Hvr and the output signal Hwr are switched has rise and fall of the pulse. The output signal Hvr-Hwr (second signal) is output. The third comparator 22c has a rise and fall of a pulse at an electrical angle at which the output signal Hwr is inputted to the + terminal and the output signal Hur is inputted to the − terminal, and the magnitude of the output signal Hwr and the output signal Hur is switched. Output signal Hwr-Hur (second signal) is output.

  The logic circuit 12 converts the output signals Hur to Hwr (sine waves) of the first to third radial Hall elements 4a to 4c into rectangular waves, the output signals Hur to Hwr converted into rectangular waves, and the output signal Hvr. A position signal PP3 indicating the rotation position of the rotor magnet 1 and a direction signal DIR3 indicating the rotation direction of the rotor magnet 1 are generated based on -Hwr and Hwr-Hur, and the generated position signal PP3 and direction signal DIR3 are controlled by the control unit. 15 is output.

  FIG. 7 is a diagram showing the relationship between the electrical angle and the output signals Hur to Hwr, the output signals Hur-Hvr, Hvr-Hwr, Hwr-Hur, the position signal PP3, and the direction signal DIR3.

  Here, as shown in FIG. 7, the output signal Hur-Hvr of the first comparator 22a has a waveform in phase with the output signal Hwc of the third circumferential hall element 4f shown in FIG. 4 of the first embodiment. Show. Similarly, the output signal Hvr-Hwr of the second comparator 22b shows a waveform in phase with the output signal Huc of the first circumferential Hall element 4d, and the output signal Hwr-Hur of the third comparator 22c is the second A waveform having the same phase as the output signal Hvc of the circumferential hall element 4d is shown.

  Therefore, the position signal PP3 and the direction signal DIR3 generated by the control unit 15 of the brushless motor 102 according to the present embodiment are the position signal PP1 and the direction signal DIR1 generated by the signal processing unit 10 of the brushless motor 100 according to the first embodiment. Are the same.

  As described above, the brushless motor 102 according to the present embodiment includes the signal processing unit 20 that performs a process of generating a signal electrically (hereinafter referred to as a multiplication process), and thus a conventionally used brushless motor. Compared to 200, it is possible to increase the resolution of the detection of the rotational position and the rotational direction of the rotor magnet 1 without increasing the number of Hall elements 4.

(Modification)
Next, a modified example of the brushless motor 102 according to the present embodiment will be described.

  Similarly to the brushless motor 100 according to the first embodiment, the brushless motor 103 according to the present modification includes first to third radial hall elements 4a to 4c and first to third circumferential hall elements 4d to 4f. Prepare.

  FIG. 8 is a schematic diagram illustrating a configuration of the signal processing unit 30 according to the present modification. The signal processing unit 30 includes the first to third radial hall elements 4a to 4c and the first to third circumferential directions. Multiplication processing of the output signals Hur to Hwc input from the Hall elements 4d to 4f is performed. As shown in FIG. 8, in addition to the logic circuit 12 having the direction discrimination circuit 13, the signal processing unit 30 includes six operational amplifiers 31, three inverting amplifiers 33, and six comparators (second signal generation unit). ) 32. Output signals Hur to Hwr are input to the three inverting amplifiers 33, and thereby, the three inverting amplifiers 33 output −Hur to −Hwr that are inverted signals of the output signals Hur to Hwr.

  The six comparators 32 include output signals Hur to Hwc from the six operational amplifiers 31 and inverted signals -Hur to -Hwr from the three inverting amplifiers 33, as shown in FIG. Each of them is inputted in a combination of things different by 90 degrees. As a result, output signals Huc-Hur, Huc + Hur, Hvc-Hvr, Hvc + Hvr, Hwc-Hwr, Hwc + Hwr (third signal) are output from the six comparators 32.

  The logic circuit 12 includes output signals Hur to Hwc output from the six operational amplifiers 31 and output signals Huc-Hur, Huc + Hur, Hvc-Hvr, Hvc + Hvr, Hwc-Hwr, Hwc + Hwr output from the six comparators 32. A total of 12 output signals are input. These output signals inputted to the logic circuit 12 have different phases, and therefore the logic circuit 12 can output a position signal PP4 having 24 rising and falling pulses per electrical angle of 360 degrees. As described above, this means that the pulse rises and falls 192 times per rotation (mechanical angle 360 degrees) of the rotor magnet 1.

  As described above, the brushless motor 103 according to the present modification includes the signal processing unit 30 that performs the electrical multiplication process, so that the rotor is more effective than the brushless motor 100 according to the first embodiment without adding the Hall element 4. The resolution for detecting the rotational position of the magnet 1 can be increased. Similarly, the direction signal DIR4 determined by comparing the permutations of the output signals input to the logic circuit can also have high resolution.

  In this modification, the brushless motor 103 in which the rotor magnet 1 has eight poles and the stator 2 has six coils 3 is described as in the brushless motor 100 according to the first embodiment. Similarly to the brushless motor 101 according to the modified example, the rotor magnet may have 16 poles and the stator may have 12 coils. In such a case, in the brushless motor 101 according to the first embodiment, the three Hall elements 4g to 4i in which the radial Hall elements are rotated 45 degrees clockwise and the radial Hall elements are rotated counterclockwise. The three Hall elements 4a to 4c, which are not provided with the three Hall elements 4j to 4l arranged by rotating 45 degrees and the magnetic sensitive direction is oriented in the radial direction, and the magnetic sensitive direction is the circumferential direction. What is necessary is just to set it as the structure provided only with the three circumferential direction Hall elements 4d-4f arrange | positioned facing, and also provided with the signal processing part 30 similar to the brushless motor 103 which concerns on this modification. With such a configuration, even if the number of hall elements 4 provided is half, the same position signal and direction signal as those of the brushless motor 101 according to the modification of the first embodiment can be provided and output.

  Further, in the present embodiment, the configuration in which the magnification of the multiplication process performed by the signal processing unit 20 is 2 times is described. However, the magnification of the multiplication process performed by the signal processing unit 20 is not limited to this, and the brushless motor What is necessary is just to determine suitably according to the resolution required for control of 101.

[Summary]
As described above, the brushless motor according to the present invention can increase the resolution of detecting the rotational position of the rotor magnet without increasing the size. For this reason, for example, a motor for driving an accessory of a gaming machine, which requires high resolution for rotational position detection, and requires a large driving torque, but is suitable for a brushless motor provided in a place where the size cannot be increased. Can be used.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be used for a brushless motor.

1 Rotor magnet (rotor)
2 Stator 3 Coil (drive coil)
4 Hall element 4a-4c 1st-3rd radial direction Hall element (1st Hall element)
4d to 4f First to third circumferential Hall elements (first signal generation unit, second Hall element)
10, 20, 30, 210 Signal processing units 22a to 22c First to third comparators (first signal generation unit)
32 comparator (second signal generator)
100, 101, 102, 103, 200 Brushless motor

Claims (4)

The rotational position of the rotor equipped with the magnet is detected by a Hall element arranged between the magnetic poles of the stator provided with a gap with respect to the rotor, and the current to the drive coil wound around the magnetic pole is controlled. A brushless motor that
First Hall elements disposed at N different electrical angles in accordance with N (N is an integer of 2 or more) phase current applied to each drive coil;
A first signal generation unit that generates a second signal having an electrical angle phase different from that of the N first signals output from the N first Hall elements;
The first signal generation unit is provided between the magnetic poles, at a position where the electrical angle is equal to the first Hall element and the mechanical angle is different from the first Hall element so that the direction of magnetic sensitivity is different from that of the first Hall element. A brushless motor comprising at least one second hall element . N = 3, and three second Hall elements are provided,
The first Hall element is disposed such that a magnetic sensitive direction faces a radial direction of the rotor,
2. The brushless motor according to claim 1 , wherein the second Hall element is arranged such that a magnetic sensing direction faces a circumferential direction of the rotor. A second signal that generates a third signal having an electrical angle phase different from that of the N first signals and the second signal by using at least two signals of the N first signals and the second signals. brushless motor according to claim 1 or 2, characterized in that it comprises a generator. The rotational position of the rotor equipped with the magnet is detected by a Hall element arranged between the magnetic poles of the stator provided with a gap with respect to the rotor, and the current to the drive coil wound around the magnetic pole is controlled. A brushless motor that
First Hall elements disposed at N different electrical angles in accordance with N (N is an integer of 2 or more) phase current applied to each drive coil;
A first signal generation unit that generates a second signal having an electrical angle phase different from that of the N first signals output from the N first Hall elements;
The first signal generator, the N by using the first signal, the second signal generating means generates the to lube Rashiresumota.

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