KR200156497Y1 - Rotation number detection device using hall sensor for position detection of motor - Google Patents

Abstract

The present invention relates to a rotation speed detection device, and more particularly, to a rotation speed detection device capable of generating a tripled signal using a hall sensor for detecting the rotational position of the rotor of the non-commutator motor. . The encoder speed detection device is expensive and difficult to install. Conventional simple Hall sensor rotation speed detection device has a problem that the degree is low. The rotation speed detection device of the present invention outputs a three times multiplied rotation speed detection signal using three Hall sensors. The device of the present invention is used to control the drive speed of the motor.

Description

Rotation speed detection device using Hall sensor for motor position detection

1 is a view for explaining the rotation speed detection device of the encoder method,

2 is a view for explaining a conventional speed detection device of a simple Hall sensor method,

3 is a view showing a rotation speed detection device using a Hall sensor according to the present invention,

4 is a view showing output signals from the third FIG. Device;

5 is a diagram for describing an output voltage of the input value processor of FIG. 3.

* Explanation of symbols for main parts of the drawings

116: rotor 140: micom

150: Hall sensor 160: first comparator

170: input value processor 172: first resistor

174: power supply 176: second resistor

180: second comparator

The present invention relates to a rotation speed detection device, and more particularly, to a rotation speed detection device capable of generating a tripled signal using a hall sensor for detecting the rotational position of the rotor of the non-commutator motor. .

Generally, various methods are used for the rotation speed detection of a motor rotor as needed. For example, when it is necessary to precisely control the driving speed of the motor, an encoder method is used. Otherwise, an encoder method that simply logics a signal of a hall sensor is used.

FIG. 1 is a diagram for explaining an encoder-type rotation speed detecting apparatus, in which an overall shape, a critical part, and an output signal are shown in FIGS. 1 (a) to 1 (d), respectively. The encoder plate 20 is provided in the motor shaft 12 of the motor 10 also in 1st (a). The encoder plate 20 is rotated in the same direction when the motor shaft 12 is rotated. The encoder plate 20 has a plurality of slits 22 arranged regularly at regular angular intervals as shown in FIG. 1 (b). This slit 22 is a portion through which light passes.

An encoder detector 30 is arranged near the encoder plate 20. The encoder detector 30 accommodates one side of the encoder plate 20 and outputs a predetermined pulse signal in accordance with the rotation of the encoder plate 20. The encoder detector 30 is provided with a light emitting element 32 and a light receiving element 34 as shown in FIG. 1 (c). The encoder plate 20 is positioned between the light emitting element 32 and the light receiving element 34. Light of the light emitting device 32 is transmitted to the light receiving device 34 through the slit 22 formed in the encoder plate 20. When the encoder plate 20 is rotated, light generated from the light emitting device 32 is transmitted to the light receiving device 34 at predetermined time intervals. That is, the light receiving element 34 outputs a binary signal according to the rotational speed of the encoder plate 20. An example of a binary signal output through the encoder detector 30 is shown in FIG. 1 (d).

The microcomputer 40 is connected to the encoder detector 30. The microcomputer 40 controls the driving speed of the motor 10 and obtains driving speed information of the motor 10 through the encoder detector 30.

In the encoder method as described with reference to FIG. 1, it is difficult to make an encoder plate, an encoder detector, etc., and it is expensive to handle and install.

2 is a view for explaining a conventional simple hall sensor rotation speed detection device, the overall shape and the output signal is shown in Figures 2 (a) and 2 (b), respectively. In figure 2 (a) a motor 10 with a stator 14 and a rotor 16 is shown. The hall sensor 50 is provided near one side of the rotor 16.

This hall sensor 50 is for detecting the rotational position of the rotor 16. The hall sensor 50 outputs a hall signal in accordance with the rotational speed of the rotor 16. The comparator 60 is connected to the hall sensor 50. This comparator 60 compares the hall signal with the reference level and outputs a standardized binary signal as shown in FIG. 2 (b). The microcomputer 40 is connected to this comparator 60. The microcomputer 40 is for controlling the rotational speed of the rotor 16 and obtains the position and rotational speed information of the rotor 16 from the binary signal from the comparator 60.

In the rotation speed detection device as described with reference to FIG. 2, since the signal detection cycle is slow, the driving speed of the motor cannot be precisely controlled.

An object of the present invention is a rotation speed detection device for detecting the rotational speed of the rotor of the motor having a stator and a rotor accommodated inside the stator is rotated when the power is applied, 120 degrees spaced around the rotor Hall sensors arranged to output hall signals of different phases according to the rotation angle of the rotor to provide rotation position information of the rotor, and each hall signal output from the hall sensors to a first reference level. Compared to the first comparators for outputting the first, second, third binary signals of different phases, respectively, the predetermined voltage according to the high, low state of the first, second, third binary signals And a second comparator configured to output a fourth binary signal multiplied by three times by comparing an input value processor consisting of a power supply voltage and resistors for output and an output voltage of the input value processor with a second reference level. Can be achieved by a rotation speed detection device.

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

3 is a view showing a rotation speed detection device using a Hall sensor according to the present invention, Figure 4 is a view showing the output signals from the third FIG.

3 shows a rotor 116 of a motor and a microcomputer 140 for controlling the rotational speed of the rotor 116. Three Hall sensors 150 are disposed around the rotor 140 at intervals of 120 degrees. The Hall sensors 150 output Hall signals of different phases according to the rotational position of the rotor 116, respectively. Hall sensors 150 are connected to the microcomputer 140, and each hall signal output from the microcomputer 140 is applied to the microcomputer 140 to provide rotation position information of the rotor 116.

In addition, the first comparators 160 are connected to the hall sensors 150 in the hall sensors 150. The first comparators 160 output the first, second, and third binary signals s1, s2, and s3 having different phases by comparing the respective hall signals with the first reference level. The first, second and third binary signals s1, s2 and s3 are shown in Figs. 4 (a), 4 (b) and 4 (c), respectively. These first, second and third binary signals s1, s2 and s3 have a phase difference of 120 degrees. If two of the first, second, and third binary signals s1, s2, and s3 are high, the other one remains low. If the two signals are low, the other one remains low. Will remain high. Here, the high state means that a voltage of a predetermined magnitude is applied, and the low state means that the voltage is zero.

The input comparator 170 is connected to the first comparators 160. The input value processor 170 includes first resistors 172 connected to the first comparators 160, respectively. The first resistors 172 all have the same resistance value. The first term 172 is connected to a power source 174 having a predetermined magnitude and a second resistor 176. The input value processor 170 outputs a predetermined voltage according to the high and low states of the first, second, and third binary signals output from the first comparator 160. That is, when two signals among the first, second, and third binary signals are high and the other signal is low, the high signal is output. At this time, the connection state between the first and second resistors 172 and 176 and the power source 174 is in a state as shown in FIG. 5 (a). On the contrary, when two signals are low and the other one is high, a low signal is output. At this time, the connection state between the first and second resistors 172 and 176 and the power source 174 is as shown in FIG. 5 (b). This state changes every time the rotor 116 is rotated 30 degrees. The output voltage of the input value processor 170 will be described in more detail with reference to FIG. 5.

The second comparator 180 is connected to the input value processor 170. The second comparator 180 outputs the fourth binary signal s4 multiplied by three times by comparing the voltage applied from the input value processor 170 with the second reference level. The fourth binary signal s4 is shown in FIG. 4 (d). The fourth binary signal s4 is applied to the microcomputer 140, and the microcomputer 140 obtains more accurate rotation speed information of the rotor 116.

FIG. 5 is a diagram for explaining the output voltage of the input value processor of FIG. 3, and is shown in FIG. 5 (a) and FIG. 5 (b) according to the state. FIG. 5 (a) shows a state when two phases are high and one phase is low, and FIG. 5 (b) shows a state when two phases are low and one phase is high.

In FIG. 5A, the first resistor 172 is R and the second resistor 176 is 3/4 · R.

here,

Becomes

In Figure 5 (b) is as follows.

These two output voltage values are compared with the second reference level in FIG. 3 and the second comparator, and the second comparator can output the third multiplied fourth binary signal as shown in FIG. As the second reference level, an average value of two output voltage values may be used.

As described above, the rotation speed detection device according to the present invention as described with reference to FIGS. 3 to 5 can detect the rotation speed of a relatively superior rotor using only a Hall sensor for detecting the position of the rotor. .

Claims (4)

A rotation speed detecting device for detecting a rotation speed of a rotor of a motor having a stator and a rotor accommodated inside the stator and rotating when power is applied, wherein the rotation speed detection device is disposed around the rotor at 120-degree intervals. Hall sensors for outputting the position information of the rotor by outputting a hall signal of a different phase respectively according to the rotation angle of the rotor; First to third comparators for outputting first, second, and third binary signals each having a different phase shaped by comparing the respective hall signals output from the hall sensors with a first reference level; It consists of a circuit having a predetermined power supply voltage and resistors R and R _x , wherein two binary signals among the first to third binary signals input from the first to third comparators are high and the rest are high. An input value processing unit for outputting a high level voltage value when one binary signal is low and outputting a low level voltage value when the two binary signals are low and the other binary signal is high; And a fourth comparator for outputting a fourth binary signal having a frequency multiplied by three times the frequencies of the first to third binary signals as a result of comparing the output voltage of the input value processor with a second reference level. Rotation speed detection device characterized in that. 2. The display device of claim 1, wherein the input value processor is connected to the first to third comparators, respectively, and includes first resistors R having a resistance value of the same size, and a second resistor disposed between the power supply voltage and the first resistor. A rotation speed detection device comprising a resistor (R _x ). The rotation speed detection device according to claim 1, wherein the output signal of the fourth comparator is supplied to a micom for adjusting the rotation speed of the rotor. 4. The rotation speed detection device according to claim 3, wherein the hall sensors are respectively connected to a microcomputer.