KR19990050509A - Brushless motor - Google Patents

Abstract

The present invention provides a brushless motor that detects the sebum signal, which is an index signal, by deforming the magnetizing portion of the fG signal generated by the fG signal, and causes a rotational movement to the rotor. In the brushless motor comprising a stator provided with a f f pattern portion for detecting the magnetic flux generated from the f f rotator part, the magnet is less magnetized at least at one place of the f f f spr part where the magnet is magnetized. The magnetizer and the signal output from the deformed magnetizer are detected by a hall sensor, and the detection circuit outputs the detected signal.

Description

Brushless motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor, and more particularly, to a brushless motor in which an index signal is detected by demagnetizing a magnet.

In general, the brushless motor generates one pulse in one rotation of the rotor to detect the rotational position of the motor and is used as an index signal. The index signal is used to detect one rotation. It is used as a Phase Generation (FG) signal, and an FG (Frequency Generation) signal is used to control the speed of the motor.

1 is a schematic view showing a brushless motor according to the prior art.

The brushless motor according to the related art is generated in the magnet 12 in proximity to the rotor 10, the magnet 12 provided on one side of the rotor 10, and the rotor 10. The sensor 14 is configured to detect the magnetic flux.

In the brushless motor according to the related art, which is configured as described above, the magnetic flux generated by the magnet 12 provided on one side of the rotor 10 is rotated by the rotor 10. It is detected by the sensor 14 near to and used as an index signal.

However, there is a problem in that the manufacturing process is complicated by the magnet provided in the rotor and the sensor in which the magnetic flux generated in the magnet is detected, thereby increasing the production cost.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, the main object of the invention is a brushless motor that detects the sebum signal, which is an index signal, by deforming and magnetizing the fudge magnetizing portion in which the fudge signal is generated. To provide.

1 is a schematic view showing a brushless motor according to the prior art,

2 is a waveform diagram of a deformation magnet according to the present invention,

3 is a detection circuit diagram in which a signal generated from a strain magnet is detected;

4 is a waveform diagram of each part of FIG. 3.

<Description of the symbols for the main parts of the drawings>

10: rotor 12: magnet

14 sensor 31 first amplifier

32: second amplifying element 33: first inverting element

34: second inverting element 300: first amplifying unit

320: second amplifier 340: detector

A feature of the present invention for achieving the above object is a rotor having a f-fastener part, a stator having a f-pattern part which causes a rotational movement in the rotor and the magnetic flux generated from the f-fastener part is detected. In the brushless motor configured, the deformed magnetized portion in which the amount of magnet is small and the signal output from the deformed magnetized portion is detected by a Hall sensor in at least one portion of the f-magnetized magnet portion in which the magnet is magnetized, and the detection is performed by the Hall sensor. The circuit is composed of a detection circuit for outputting a signal.

Hereinafter, a preferred embodiment of a brushless motor according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a waveform diagram of a strain magnet according to the present invention, FIG. 3 is a detection circuit diagram of detecting a signal generated from the strain magnet, and FIG. 4 is a waveform diagram of each part of FIG. 3.

The brushless motor according to the present invention includes a rotor including an after-stage attachment portion, a pattern pattern portion causing a rotational movement to the rotor, and a magnetic flux generated from the after-stage attachment portion detected. In a brushless motor comprising a stator, a deformed magnetized part in which the amount of magnet is magnetized in at least one portion of the f-positioned magnet part in which the magnet is magnetized, and a signal output from the deformed magnetized part is transmitted to the hall sensor. Is detected, and the detected signal is output.

The detection circuit includes a first amplifier 300 to amplify the output of the hall sensor as an input, and a second amplifier to amplify the signal amplified by the first amplifier 300 by comparing with a set voltage Vref. The unit 320 is an exclusive OR gate that detects an index signal by inputting the clock CLK generated by the F-attachment unit and the F-pattern and the output of the second amplifier 320. The detector 340 is configured.

The first amplifying unit 300 is a first amplifying device, the output of the Hall sensor is a non-inverting input, connected to the ground through a capacitor (C) and a fourth resistor (R4) connected in series to the inverting input And between the output of the first amplifying element 31 and the capacitor C, the first diode and the second diode D1 and D2 which are connected in parallel with each other with the anode and the cathode. It is composed.

The second amplifier 320 is a reference voltage (Vref) is divided into a first resistor (R1) and a second resistor (R2) to be an inverting input, the output of the first amplifier 300 is a non-inverting input The second amplifying device 32 and the output of the second amplifying device 32 are inverted, and the third resistor R3 is disposed between the output and the non-inverting input of the second amplifying device 32. The first inverting element 33 connected thereto and the second inverting element 34 which inverts the output of the first inverting element 33 as an input.

The following describes the operating state of the present invention configured as described above.

A magnet of a certain size is magnetized in the rotor part of the rotor, and the rotation of the rotor is controlled by a detection signal which is a hall signal generated from the rotor part of the stator pattern in the stator pattern. Since the amount of magnetic flux generated in at least one magnet among the magnets is different, that is, the amount of the magnetic flux is smaller than that of the other magnets, the waveform is generated as shown in FIG. 2.

The signal generated as described above is applied to the detection circuit through the Hall sensor, and the output (Hall) of the Hall sensor becomes a non-inverting input and connects the first diode and the second diode (D1) and D2 connected to the output. By comparing the signal stored in the condenser C and amplifying the same, if a voltage difference is generated in the input signal, the signal is detected by the first amplifier 31 which is an op amp and a Vx signal is generated. Since two maximum magnetic flux points are generated by the F magnetized magnetized parts, the two waveforms, that is, the Hall signal by the deformed magnetized body, are generated by two switching.

In addition, the signal output from the first amplifier 31 is input to the non-inverting input of the second amplifier 32 of the second amplifier 320, is compared by the reference voltage (Vref) and amplified and output (Vy), which is used as a phase signal that is an index signal.

The output Vy is input to the detector 340 which is an exclusive OR gate through the first and second inverting elements 33 and 34. Since the signal caused by the deformed magnetizer is removed by the hole clock, the output of the detector 340 is used as an fG signal, that is, an FG signal for controlling the rotation of the motor.

As described in detail above, the brushless motor according to the present invention has the effect that the sebum signal, which is an index signal, and the fG signal are simultaneously detected by deforming and magnetizing the fG magnet part in which the fG signal is generated.

The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

Claims (5)

In a brushless motor comprising a rotor having a f-seated portion, and a stator having a f-pattern portion for causing a rotational movement to the rotor and detecting magnetic flux generated from the f-seeded portion, the magnet is magnetized. A deformed magnetizer portion in which the amount of magnet is magnetized at least at one place of the F-position magnetizer portion; And a detection circuit for detecting a signal output from the deformed magnetizing unit by a hall sensor and outputting the detected signal. The display apparatus of claim 1, wherein the detection circuit comprises: a first amplifier configured to amplify the output of the hall sensor as an input; A second amplifier for amplifying the signal amplified by the first amplifier by comparing with a set voltage; And a detector configured to detect an index signal by inputting a clock generated by the F-squared part, the F-pattern, and an output of the second amplifier part. The brushless motor of claim 2, wherein the detection unit is an exclusive ora gate. 2. The apparatus of claim 1, wherein the first amplifier comprises: a first amplifier having an output of the hall sensor as a non-inverting input, connected to ground through a capacitor connected in series and a fourth resistor to be inverted input; And a first diode and a second diode configured to be connected in parallel with each other between the output of the first amplifying device and the condenser. 2. The power amplifier of claim 1, wherein the second amplifier comprises: a second amplifier having a reference voltage divided by a first resistor and a second resistor to be an inverting input, and an output of the first amplifier is a non-inverting input; A first inverting element which inverts the output of the second amplifying element as an input and has a third resistor connected between the output and the non-inverting input of the second amplifying element; And a second inversion element for inverting the output of the first inversion element as an input.