KR100239472B1 - Detecting apparatus and method of motor rotation - Google Patents

Abstract

An apparatus and method for detecting a rotational speed of a motor, the apparatus comprising a power supply unit for applying a first power to rotate the motor, a rotation detection unit for detecting the rotational speed corresponding to the discontinuous current of the motor, the motor It is possible to solve the economic burden by detecting the rotational speed by N (2≤N) discontinuous current according to the rotation of the motor by applying power to the motor.In the case of a motor with 2N commutator pieces, 2N discontinuous current can be obtained. High speed control can be realized.

Description

Motor rotation speed detection device and method

The present invention relates to an apparatus and a method for detecting the rotational speed of a motor.

In general, the detection of the rotational speed of the slide motor in the optical disk drive, which is widely used, has been used using an optical sensor or a magnetic sensor, and is a basic factor for calculating the moving distance of the drive slide.

In addition, a DC motor is usually used as the slide motor.

Hereinafter, a motor speed detection apparatus according to the prior art will be described with reference to the accompanying drawings.

1 is a cross-sectional view showing a motor speed detection device as an embodiment of the prior art, Figure 2 is a perspective view showing a motor speed detection device as another embodiment of the prior art.

According to an embodiment of the prior art, as shown in Figure 1, a motor 1 that rotates at a specific speed, a rotating disk (2) attached to the rotating shaft of the motor (1) having a sensing hole in a predetermined region, It consists of an optical sensor (3) for sensing the rotation state by passing the light beam through the sensing hole of the rotating disk (2) and outputs a pulse.

In the operation of the above configuration, first, when the rotating disk 2 through the motor 1 rotates at a certain speed, the optical sensor 3 outputs a light beam to the rotating disk 2.

The optical sensor 3 penetrates a light beam through a sensing hole formed in a predetermined region of the rotating disk 2, and receives the penetrating light beam again to generate a pulse for a time when the light beam is received.

Such pulses are counted by the signal processing means and represented by the number of revolutions.

Meanwhile, according to another embodiment of the prior art, as shown in FIG. 2, a motor 1 rotating at a specific speed, and having magnetic poles S poles and N poles, which are connected to a rotating shaft of the motor 1 and formed at regular intervals, are provided. The magnetization disc 4 and the magnetization sensor 5 for sensing the change in the magnetic field of the magnetization disc 4 and outputting the pulse.

In the operation of the above configuration, first, when the magnetic disk 4 through the motor 1 rotates at a constant speed, the magnetic sensor 5 senses the magnetic field from the magnetic disk 4.

At this time, the magnetic sensor 5 outputs a pulse corresponding to the change of the magnetic field S pole, N pole generated in the magnetic disk (4).

Such pulses are counted by the signal processing means and represented by the number of revolutions.

The rotation speed calculated in the prior art as described above can be converted into a gear ratio for power transmission to obtain the optical pickup and slide transfer distance of the optical disk.

Motor rotation speed detection device according to the prior art has a high economic burden on the cost and maintenance of the magnetic disk, the slit disk, the magnetic sensor and the optical sensor, and when applied to the optical disk, the characteristics vary depending on the type of motor The high speed accessor of the optical pickup is difficult because the drive feed control is difficult.

The present invention has been made to solve the above problems, in particular, the motor speed detection device and method for detecting the rotation speed by converting the back electromotive force generated in the motor into a pulse as well as the high speed accessor of the optical pickup to solve the difficulty The purpose is to provide.

1 is a cross-sectional view showing a motor speed detection device as an embodiment of the prior art.

2 is a perspective view showing a motor speed detection device as another embodiment of the prior art.

3 is a configuration diagram showing a motor speed detection device according to the present invention.

Figure 4 is a detailed view showing in detail the rotor, the brush and the commutator of the motor according to the present invention.

5 is a voltage waveform diagram of a discontinuous point of current generated by a brush and a commutator of a motor according to the present invention.

<Explanation of symbols for main parts of drawing>

10: DC motor 15: power supply

20: voltage detector 25: amplifier

30: waveform shaping part 35: brush

40: commutator 45: winding

Motor rotation speed detection device of the present invention for achieving the above object is a power supply for applying a first power source to rotate the motor, a voltage detector for detecting a voltage corresponding to the discontinuous current of the motor, the voltage of the voltage detector And an amplifying unit for amplifying the waveform and a waveform shaping unit receiving the amplified voltage and converting the amplified voltage into pulses. According to the present invention, power is supplied to the motor, and N (2≤N) according to the rotation of the motor. By detecting the voltage with two discontinuous currents, the economic burden is eliminated, and in the case of a motor with 2N commutator pieces, 2N discontinuous currents can be obtained, thereby achieving high speed control.

Hereinafter, an apparatus and method for detecting a motor speed according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram showing a motor speed detection device according to the invention, Figure 4 is a detailed view showing the rotor, the brush and the commutator in detail of the motor according to the invention, Figure 5 is a motor of the present invention A voltage waveform plot of the discontinuities in the current generated by the brush and commutator.

The present invention consists of a power supply unit 15, a motor 10, and a rotation detection unit 100, wherein the motor 10 rotated by the power supply unit 15 is discontinuous two times each time one revolution is rotated. Appears.

The discontinuous current is detected by the rotation detecting unit 100 to convert the rotation speed.

In more detail, as shown in FIG. 3, the present invention provides a power supply unit 10 for supplying a DC voltage, a DC motor 10 driven by a DC power supply of the power supply unit 15, and the DC. The voltage detector 20 detects the voltage at the current discontinuity of the motor 10, the amplifier 25 differentially amplifies the voltage of the voltage detector 20, and the voltage amplified by the amplifier 25. It consists of a waveform shaping part 30 which converts into a pulse and outputs it.

As shown in FIG. 4, the DC motor 10 includes a brush 35 and a commutator 40 and a brush 35 and a commutator (40) to generate a discontinuous point of the power supplied from the power supply unit 15. It consists of a winding 45 to rotate the rotor (not shown) in response to the discontinuous power of 40.

Here, the power of the power supply unit 15 is supplied in series to the voltage detector 20 and the DC motor 10.

In addition, the voltage detector 20 is formed of a resistance element, and detects the discontinuous current of the motor 10 and outputs it in the form of voltage.

In the operation and method according to the present invention configured as described above, power is first supplied to the motor 10 via the voltage detector 20 when power is applied from the power supply unit 15.

At this time, the motor 10 rotates with the supplied power, and as shown in FIG. 4, the power is converted into a discontinuous current by the brush 35 and the commutator 40, and the current is supplied to the winding ( 45) to rotate the rotors (not shown).

In general, the motor 10 generates two discontinuous currents for each revolution of the brush 35 and the commutator 40.

Then, it is detected by the discontinuous voltage detector 20 and output in the form of a voltage waveform as shown in FIG.

Subsequently, the voltage detected by the voltage detector 20 is amplified to a voltage as high as possible in the amplifier 25, and subsequently input to the waveform shaping unit 30 to generate two pulses per rotation of the motor 10. You lose.

Pulses corresponding to the rotation of the motor 10 as described above may be converted into the number of revolutions by a predetermined signal processing means.

The large-capacity motor 10 includes a plurality of pairs of commutator pieces (brushes and commutators). For example, in the case of a motor in which the brush 35 and the commutator 40 have N, 2N times due to 2N discontinuous currents Since pulses can be obtained, N-times improved precision can be obtained.

The apparatus and method for detecting the motor speed according to the present invention can be easily implemented by using the discontinuous current of the motor, thereby reducing the economic burden, and in the case of a motor having 2N commutator pieces, 2N discontinuous current can be obtained. There is an effect that high speed control can be realized.

Claims (5)

An apparatus for detecting the rotation speed of a motor; A power supply for applying a first power to rotate the motor; A voltage detector detecting a voltage corresponding to the discontinuous current of the motor; An amplifier for amplifying the voltage of the voltage detector; And a waveform shaping unit for receiving the amplified voltage and converting the amplified voltage into pulses. The apparatus of claim 1, wherein the voltage detector is a resistance element. A method for detecting a rotational speed of a motor; Applying power to the motor; And detecting the number of revolutions of the N (2≤N) discontinuous currents in accordance with the rotation of the motor. A method for detecting a rotational speed of a motor; Applying power to the motor; Detecting N discrete currents from the motor; Outputting pulses corresponding to the N discrete currents; Motor rotation speed detection method comprising the step of converting the rotation speed with the pulse. CLAIMS 1. A method for detecting a rotational speed of a motor having N commutator pieces, comprising: applying power to the motor; Applying power to the motor; Detecting 2N discrete currents from the motor; Outputting pulses corresponding to the 2N discontinuous currents; Motor rotation speed detection method comprising the step of converting the rotation speed with the pulse.