KR102628771B1 - Motor rotation direction determination device using a single magnetic hall sensor that detects gear tooth - Google Patents

Abstract

The present invention relates to a motor rotation direction determination device that has been improved to have higher resolution than the prior art while always maintaining the phase difference between the two signals output when the motor rotates at 90°, more specifically, A magnet is installed inside, and the 1st, 2nd, and 3rd hall sensors are sequentially placed on the magnet in the circumferential direction of the gear mounted on the rotation axis of the motor, and the space between the 1st, 2nd, and 3rd hall sensors is the gear teeth of the gear. Magnetic Hall sensors are each formed at regular intervals that can be divided into two in the circumferential direction of the gear teeth, and when the motor rotates, the first, second, and third Hall sensors detect the gear teeth by changes in the magnetic field of the magnet; When the motor rotates, first and second amplification units generate and amplify first and second signals with different phases, respectively, based on detection signals input from the first and second Hall sensors and the second and third Hall sensors, respectively; A comparison unit that compares the first and second signals to select a signal with a faster phase; From the comparator, only information about the signal with a faster phase among the first and second signals and signals corresponding to the information are input, and the signal with a faster phase among the first and second signals is output to the display, and a signal with a phase that is 90° slower than the signal. A signal setting unit that outputs to a display; It relates to a motor rotation direction determination device using a single magnetic Hall sensor that detects the gear teeth of a gear, including a frequency multiplier that multiplies the signal with a faster phase among the first and second signals and outputs it to a signal setting unit.

Description

Motor rotation direction determination device using a single magnetic hall sensor that detects gear tooth}

The present invention relates to a motor rotation direction determination device, and in particular, to a motor rotation direction determination device that detects the gear teeth of a gear with a single magnetic Hall sensor and determines the rotation direction of the motor when the motor rotates.

Generally, the rotation direction determination device of the motor is driven using a motor, such as a seat control device and sunroof control device applied to automobiles, and a lift control device applied to forklifts, and is used in devices that control the forward and reverse rotation directions of the motor. It was mainly used.

In other words, it notifies the control device of the direction of rotation of the motor and allows it to know the rotation angle, speed, and position of the motor.

Therefore, conventionally, the rotation direction and speed of the motor were measured using an optical rotary encoder that detects the light of the light emitting element in the light receiving element through the slit of the rotating disk rotated by the motor.

There are two types of measurement methods: the absolute method and the incremental method. The absolute method is used to measure angles, and the incremental method is used to measure speed or rotation speed.

In other words, rotary encoders were used in control devices that required precise motors.

However, when used in a control device that requires driving a motor in a rough outdoor environment, dust or corrosion occurred in the slit, preventing the passage of light.

In addition, light-receiving elements and light-emitting elements are weak in strength and cannot respond to environmental changes caused by rain, snow, wind, etc., and are easily damaged.

Because of this, the resolution was lowered and replacement of the rotating disk, light receiving element, and light emitting element was necessary.

Additionally, rotary encoders had the problem of being expensive.

Therefore, instead of a rotary encoder, a method was used where a gear was mounted on the rotating shaft of the motor and the gear teeth of the gear were detected using two Hall sensors.

In other words, two Hall sensors were placed in different phases of the gear, so that when the motor rotates, two signals with 90° different phases are output.

However, in this method, due to the imbalanced spacing of the gear teeth and the poor assembly position of the two Hall sensors, the 90° phase of the two signals was shifted even if the rpm of the motor increased slightly, making it difficult to output signals accurately.

Additionally, compared to rotary encoders, this method had a fundamental problem in that the resolution was very low due to the limited number of gear teeth.

In other words, it was difficult to expect high resolution, so it had no choice but to be used only in the low rpm range of moderate motors.

In relation to this, Patent Document 1, which detects gear teeth with two Hall sensors, also had the risk of causing the same problem as above.

Patent Document 1: Registered Patent No. 10-1483826 (registered on January 12, 2015)

Accordingly, the present invention integrates three Hall sensors, which are cheaper than rotary encoders and strong enough to respond to environmental changes, into one, and when the motor rotates, the phase difference between the two output signals is always maintained at a constant 90°, The purpose is to improve the phase variation of two signals due to the imbalance of gear teeth spacing and poor assembly position of the Hall sensor compared to before.

In addition, the purpose is to improve the shortcomings of the conventional Hall sensor, which has low resolution due to the limited number of gear teeth, by increasing resolution by modulating the signal output from the Hall sensor to be output at a high frequency.

In order to achieve the above object, the present invention has a magnet installed inside, and first, second, and third Hall sensors are sequentially arranged on the magnet in the circumferential direction of the gear mounted on the rotation axis of the motor. The space between the 3-hole sensors is formed at regular intervals that can divide the gear teeth of the gear into two in the circumferential direction of the gear teeth. When the motor rotates, the 1st, 2nd, and 3rd hall sensors change the gear's magnetic field by changing the magnet's magnetic field. Magnetic Hall sensor to detect teeth; When the motor rotates, first and second amplification units generate and amplify first and second signals with different phases, respectively, based on detection signals input from the first and second Hall sensors and the second and third Hall sensors, respectively; A comparison unit that compares the first and second signals to select a signal with a faster phase; From the comparator, only information about the signal with a faster phase among the first and second signals and signals corresponding to the information are input, and the signal with a faster phase among the first and second signals is output to the display, and a signal with a phase that is 90° slower than the signal. Provided is a motor rotation direction determination device using a single magnetic Hall sensor that detects gear teeth of a gear, including a signal setting unit that outputs to a display.

In addition, the present invention is a motor rotation direction determination device using a single magnetic Hall sensor to detect gear teeth of a gear, including a frequency multiplier that multiplies the signal with a faster phase among the first and second signals and outputs it to a signal setting unit. provides.

In the present invention, when the motor rotates, a signal with a faster phase among the first and second signals output from the magnetic Hall sensor and a signal 90° slower than the signal are output from the signal setting unit, so the phase difference between the two output signals is always It has the effect of maintaining a constant angle of 90°.

In addition, because three Hall sensors are integrated into the magnetic Hall sensor, the first and second signals with a phase difference of 90° are output at the same location at the same time.

In other words, it has the effect of preventing phase fluctuations of the two signals due to the imbalanced spacing of the conventional gear teeth and poor assembly position of the Hall sensor.

Additionally, because the phase difference between the two signals output from the signal setting unit is always maintained at a constant 90°, there is an effect of accurately indicating the rotation direction of the motor, regardless of the speed of the motor.

Because of this, the rotation angle, speed, and position of the motor can be known, which has the effect of precisely controlling control devices used in automobiles, forklifts, etc.

Since the present invention uses a magnetic Hall sensor that is stronger than the conventional rotary encoder, it has the effect of preventing the sensor from being easily damaged by failing to respond to environmental changes due to rain, snow, wind, etc.

Additionally, since the unit price is lower than that of a rotary encoder, it has the effect of reducing costs.

In the present invention, since the signal with a faster phase among the first and second signals is multiplied by a frequency multiplier, the two signals output from the signal setting unit are modulated to a high frequency, which has the effect of increasing resolution.

In other words, it has the effect of improving the disadvantages of the conventional Hall sensor, which has low resolution due to the limited number of gear teeth.

Additionally, there is an effect of being able to adjust the resolution through the multiplication setting unit.

The present invention has the effect of stably outputting two signals with 90° different phases output from the signal setting unit to the display through a buffer.

In other words, two signals that are 90° out of phase are displayed seamlessly on the display by the buffer.

1 is a configuration diagram of a motor rotation direction determination device according to an embodiment of the present invention;
2 and 3 are detailed views of a motor rotation direction determination device according to an embodiment of the present invention;
4 to 7 are diagrams showing a state of use of a motor rotation direction determination device according to an embodiment of the present invention.

Accordingly, the embodiment of the present invention as described above will be described in detail based on the accompanying drawings as follows.

As shown in Figures 1 to 7, the motor rotation direction determination device 1000 according to an embodiment of the present invention is installed around the gear 2 mounted on the rotation shaft 1a of the motor 1, and , It is connected to the display (3) of the control device used in forklifts, etc.

In addition, the motor rotation direction determination device 1000 is equipped with a magnet 110 inside, and sequentially attaches the magnet 110 to the magnet 110 in the circumferential direction of the gear 2 mounted on the rotation axis 1a of the motor 1. The first, second, and third hall sensors (120) (130) (140) are disposed, and the space between the first, second, and third hall sensors (120) (130) (140) is the gear teeth of the gear (2). (2a) are each formed at regular intervals that can divide the gear teeth (2a) into two in the circumferential direction, and when the motor (1) rotates, the first, second, and third hall sensors (120) (130) (140) ) includes a magnetic Hall sensor 100 that detects the gear teeth 2a by changes in the magnetic field of the magnet 110.

Here, the first, second, and third Hall sensors 120, 130, and 140 detect when the gear teeth 2a approach the magnet 110 and the strength of the magnetic field becomes stronger when the motor 1 rotates. As a result, a High signal is output, and when the groove formed between the gear teeth 2a approaches the magnet 110 and the strength of the magnetic field weakens, it is not detected and a Low signal is output.

Additionally, the magnet 110 is made of a permanent magnet.

In addition, the motor rotation direction determination device 1000 detects input from the first and second Hall sensors 120 and 130 and the second and third Hall sensors 130 and 140, respectively, when the motor 1 rotates. First and second amplification units 200 and 210 respectively generate and amplify first and second signals with different phases based on the signal; A comparison unit 300 is included to compare the first and second signals to select a signal with a faster phase.

Here, the first amplifier 200 compares the detection signals input from the first and second Hall sensors 120 and 130 and continuously outputs amplified high and low signals.

That is, the first amplifier 200 outputs an amplified first signal in the form of a pulse.

In addition, the second amplifier 210 compares the detection signals input from the second and third Hall sensors 130 and 140 and continuously outputs amplified high and low signals.

That is, the second amplifier 210 outputs an amplified second signal in the form of a pulse that is different in phase from the first signal.

In addition, the comparison unit 300 provides information about the signal with a faster phase among the first and second signals and only signals corresponding to the information to the signal setting unit 400.

In addition, the motor rotation direction determination device 1000 receives only information about the signal with a faster phase among the first and second signals and a signal corresponding to the information from the comparison unit 300, and receives the phase information among the first and second signals from the comparison unit 300. A signal setting unit 400 is included that outputs this fast signal to the display 3 while outputting a signal 90° slower in phase than the signal to the display 3.

Here, the signal setting unit 400 generates and outputs a signal whose phase is 90 degrees slower than that of the first and second signals, based on the signal with a faster phase.

In addition, the motor rotation direction determination device 1000 includes a frequency multiplier 500 that multiplies the signal with a faster phase among the first and second signals and outputs the signal to the signal setting unit 400.

Here, the frequency multiplier 500 multiplies the signal with a faster phase among the first and second signals by an integer multiple, modulates the signal to a high frequency, and outputs the multiplied signal to the signal setting unit 400.

In addition, the frequency multiplier 500 includes a phase detector that compares the frequency of the signal with a faster phase among the first and second signals and the frequency of the signal output from Vco and passing through the frequency divider, and the frequency of the signal input from the phase detector. A low pass filter that removes noise while converting the voltage input to Vco, Vco that outputs the frequency of the signal generated by the voltage input from the low pass filter to the signal setting unit 400, and an output from Vco It includes a frequency divider that changes the frequency of the signal output from the Vco by dividing the frequency of the signal by an integer n and providing it to the phase detector.

That is, the frequency multiplier 500 multiplies the signal with a faster phase among the first and second signals using the PLL method.

In addition, the motor rotation direction determination device 1000 includes a multiplication setting unit 510 that sets the multiplication of the frequency multiplier 500.

Here, the multiplication setting unit 510 is connected to the frequency divider of the frequency multiplier 500 and sets the integer n, thereby multiplying the signal with a faster phase among the first and second signals by an integer multiple, that is, two times, three times, etc. It determines whether to do so, and is installed outside the motor rotation direction determination device 1000.

In addition, the motor rotation direction determination device 1000 receives a signal with a fast phase and a signal with a 90° slow phase among the first and second signals output from the signal setting unit 400 and outputs them to the display 3. A buffer 600 is included.

Here, the buffer 600 has the effect of storing a signal with a faster phase among the first and second signals and a signal that is 90° slower in phase, and outputting them to the display 3 at once.

The operation of the motor rotation direction determination device 1000 according to the embodiment of the present invention configured as described above will be described as follows.

As shown in Figures 1 to 5, when the motor 1 is rotated clockwise, that is, in the forward direction, the first, second, and third hall sensors 120, 130, and 140 of the magnetic hall sensor 100 detects the gear teeth 2a due to changes in the magnetic field of the magnet 110, and outputs detection signals to the first and second amplifiers 200 and 210, respectively.

Then, the first amplifier 200 generates and amplifies the first signal in the form of a pulse based on the detection signals input from the first and second Hall sensors 120 and 130, respectively, and the second amplifier 210 ) is amplified by generating a second signal in the form of a pulse whose phase is 90° slower than the first signal based on the detection signal input from the second and third Hall sensors 130 and 140.

In addition, the comparator 300 compares the first and second signals input from the first and second amplification units 200 and 210 to obtain a signal with a faster phase, that is, a first signal with a phase that is 90° faster than the second signal. The signal is selected.

Here, the comparison unit 300 outputs information about the first signal, which is faster in phase than the second signal, to the signal setting unit 400.

And, the first signal, which is faster in phase than the second signal, is multiplied by the frequency multiplier 500 and input to the signal setting unit 400.

Here, the first signal is multiplied by an integer multiple set in the multiplication setting unit 510.

Then, the signal setting unit 400 receives only information about the first signal whose phase is faster than the second signal and the multiplied first signal.

In addition, the signal setting unit 400 outputs the multiplied first signal as a forward signal to the display 3 through the buffer 600, generating a reverse signal whose phase is 90° slower than the first signal. It is output to the display 3 through the buffer 600.

That is, the display 3 displays a forward signal with high resolution and a reverse signal whose phase is 90 degrees slower than the forward signal, indicating that the motor 1 has rotated in the forward direction.

Additionally, the display 3 displays the rotation angle, speed, and position of the motor 1.

Meanwhile, as shown in FIGS. 1 to 3, 6, and 7, when the motor 1 is rotated counterclockwise, that is, in the reverse direction, the first, second, and third Hall sensors of the magnetic Hall sensor 100 (120) (130) (140) detects the gear teeth (2a) due to a change in the magnetic field of the magnet 110, and outputs a detection signal to the first and second amplifiers (200) and (210), respectively.

Then, the first amplifier 200 generates and amplifies the first signal in the form of a pulse based on the detection signals input from the first and second Hall sensors 120 and 130, respectively, and the second amplifier 210 ) is amplified by generating a second signal in the form of a pulse that is 90° faster in phase than the first signal based on the detection signal input from the second and third Hall sensors 130 and 140.

In addition, the comparison unit 300 compares the first and second signals input from the first and second amplification units 200 and 210 to generate a signal with a faster phase, that is, a second signal with a phase that is 90° earlier than the first signal. The signal is selected.

Here, the comparison unit 300 outputs information about the second signal, which is faster in phase than the first signal, to the signal setting unit 400.

And, the second signal, which is faster in phase than the first signal, is multiplied by the frequency multiplier 500 and input to the signal setting unit 400.

Here, the second signal is multiplied by an integer multiple set in the multiplication setting unit 510.

Then, the signal setting unit 400 receives only information about the second signal whose phase is faster than that of the first signal and the multiplied second signal.

In addition, the signal setting unit 400 outputs the multiplied second signal as a reverse signal to the display 3 through the buffer 600, generating a forward signal whose phase is 90° slower than the second signal. It is output to the display 3 through the buffer 600.

That is, the display 3 displays a reverse signal with high resolution and a forward signal whose phase is 90 degrees slower than the reverse signal, indicating that the motor 1 has rotated in the reverse direction.

Additionally, the display 3 displays the rotation angle, speed, and position of the motor 1.

In the above, the present invention has been shown and described by taking specific preferred embodiments as examples, but the present invention is not limited to the above-described embodiments and is within the scope of the spirit of the present invention and is within the scope of common knowledge in the technical field to which the invention pertains. Various changes and modifications will be possible by those who have it.

100: magnetic hall sensor 110: magnet
120: 1st Hall sensor 130: 2nd Hall sensor
140: 3rd Hall sensor 200: 1st amplification unit
210: second amplification unit 300: comparison unit
400: signal setting unit 500: frequency multiplier
510: Multiplication setting unit 600: Buffer
1000: Motor rotation direction determination device

Claims (4)

A magnet 110 is mounted inside, and the first, second, and third Hall sensors 120 ( 130) (140) are arranged, and the gear teeth (2a) of the gear (2) are positioned between the first, second, and third hall sensors (120, 130, and 140) along the circumference of the gear teeth (2a). They are each formed at regular intervals that can be divided into two directions, and when the motor 1 rotates, the first, second, and third Hall sensors 120, 130, and 140 are geared by changes in the magnetic field of the magnet 110. A magnetic Hall sensor (100) that detects the teeth (2a);
When the motor 1 rotates, the first and second signals with different phases are generated based on the detection signals input from the first and second Hall sensors 120 and 130 and the second and third Hall sensors 130 and 140, respectively. First and second amplification units 200 and 210 respectively generate and amplify;
a comparison unit 300 that compares the first and second signals to select a signal with a faster phase;
From the comparator 300, information on the signal with a faster phase among the first and second signals and only signals corresponding to the information are input, and the signal with a faster phase among the first and second signals is output to the display 3. A motor rotation direction determination device using a single magnetic Hall sensor for detecting gear teeth of a gear, comprising a signal setting unit (400) that outputs a signal whose phase is 90° slower than the signal to the display (3). According to paragraph 1,
Motor rotation using a single magnetic Hall sensor that detects the gear teeth of the gear, comprising a frequency multiplier 500 that multiplies the signal with a faster phase among the first and second signals and outputs it to the signal setting unit 400. Direction discrimination device. According to paragraph 2,
A motor rotation direction determination device using a single magnetic Hall sensor for detecting gear teeth of a gear, comprising a multiplication setting unit 510 that sets the multiplication of the frequency multiplier 500. According to paragraph 1,
A gear of a gear, characterized in that it includes a buffer 600 that receives a signal with a faster phase and a signal that is 90° slower in phase among the first and second signals output from the signal setting unit 400 and outputs them to the display 3. A motor rotation direction determination device using a single magnetic Hall sensor that detects cogs.

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