KR960009804Y1 - Rotary frequency occuring apparatus for a motor - Google Patents

Abstract

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Description

Rotating frequency generator of small precision motor

FIG. 1 is a diagram illustrating a rotational speed neglect configuration using a photo-interrrupt.

(a) is the rotor section of the motor,

(b) is a cross-sectional view showing the assembled state of the motor,

(c) is a block diagram showing a photo interrupt.

2 is a configuration diagram of a conventional Hall-IC (rotational speed generator),

(a) is the rotor section of the motor,

(b) is a cross-sectional view showing the assembled state of the motor,

(c) is an output waveform diagram of a hall element.

3 is a configuration of the rotation speed generator by the conventional back electromotive force (Back E.M.F).

4 is a block diagram of the rotation frequency generator of the present invention small precision motor.

5 is an output waveform diagram of each part with respect to FIG.

* Explanation of symbols for main parts of the drawings

1: Motor 2: Joule wave generator

A1 to A6: comparators S1 to S3: signal line

The present invention relates to a rotation frequency generator of a small precision motor. Especially, the small precision motor is designed to be effective when a small size of the motor is so small that other rotation frequency generators cannot be used and require high rotation resolution. It relates to a rotation frequency generator.

In order to generate the rotation frequency for speed control and rotation speed control of conventional small precision motor, precision motor is used by using Photo-Interrrupt, Hall-IC Back-EMF method. It's driven, as shown below.

First, in case of using Photo-Interrrupt, (a) of FIG. 1 shows the rotor of the motor, the part ⓐ shows the main magnetic of the rotor, ⓑ shows the encoder, and the encoder shows ｂ-1. It is divided into ｂ-2 parts and is distinguished by distinct contrast. And (b) represents the assembly of the motor, where ⓐ is the main magnetic and rotor yoke ⓑ is the encoder, ⓒ is the porter-interrupt ⓓ is the motor coil ⓔ is the stator ⓕ is the shaft, and (c) is The photo-interrupt is shown, c 'is a light-receiving part c is comprised from a light emitting part.

The cause of the rotation speed generator using the porter interrupt configured as described above is that when the motor rotates, light is emitted from the light emitting part c of the photo-interrupt ⓒ installed at the end of the stator ⓔ in FIG. When projecting toward the encoder (ⓑ), the encoder (ⓑ) of the rotor has the same contrast as in (a), so it absorbs or reflects the light and reflects it back to the light receiving part (c ') of the porter interrupt (ⓒ). To generate the rotation frequency.

And when the Hall-IC (Hall-IC) is used, the configuration of Fig. 2 (a) is a rotor of the motor ⓐ is a main-magnetic ⓑ is a super-magnetized auxiliary magnetic (b) to generate a number of revolutions (b) ) Shows the assembled state of the motor, as shown in (a) of FIG. 1, except that ⓒ is different, in this case, hole IC. In addition, (c) shows the characteristics of the Hall element, g 'represents the sensing and g represents the output waveform of the Hall element.

The operating principle of the rotation speed generator using the hole IC configured as described above is shown in Fig. 2A, in which the amount of change in the flux of the N pole and the S pole of the auxiliary magnetic, which is composed of ultra-multipoles, is installed at one end of the stator. One hole IC (©) senses g 'in FIG. 2 (c) and generates a rotational frequency as g.

In addition, in the case of the rotational speed generator by the counter electromotive force, as shown in FIG. 3, the coil is placed on the stator (ⓐ) and a frequency generator (F) is planted on the side without the coil, that is, without the main pattern (ⓑ). To make a frequency generator.

The operation principle for this is that the electromotive force is induced in the stator FV pattern ⓑ formed on the stator ⓐ when the rotor rotates. That is, the F signal corresponding to half of the number of poles of the main rotor of the motor rotor is induced in the main pattern ⓑ of the stator ⓐ. Currently, the F signal of up to three high frequencies of the main magnetic is obtained.

However, in the conventional technology, if the rotor is very small in the prior art, the resolution of the encoder becomes a problem, the cost of the porter interrupt is expensive, and there is a problem in sensing at a low speed of 200 rpm. There is no.

In addition, in case of using Hall-Hi, in order to increase the sensing sensitivity of the hall, there is concern about damage of Hall-IC due to overcurrent, and in the case of a micromotor, there is no space for installing Hall-IC and the price of Hall-IC is expensive.

In addition, due to the back EMF, the price is low, but the noise of the F signal is very high at low speed, and the price is low as the price is increased by using the filter and the amplifier to amplify the F signal to reduce the noise of the F signal. To lose. And because the size of the stator is small in the small motor, there are many limitations in the formation of the FW pattern. Therefore, the FFT pattern is used in the motor using steel-PCB as in CD-ROM. There is a problem that can not be used because the frequency generator of the back EMF type can not be formed.

Therefore, the purpose of the present invention is that the size of the motor is very small, so that it is not possible to use other rotation frequency generators and requires a rotation frequency, and the rotation of a small precision motor that can obtain a much higher accurate frequency than the conventional rotation frequency method. It is to provide a frequency generator.

Another object of the present invention is to obtain a very accurate rotation frequency even at a low speed of 200rpm or less, so that the rotation frequency generator of a small precision motor that can be applied to small precision motors such as mini-disc headphone cassettes and audio video To provide.

An apparatus for achieving the present invention is a signal line (S1.S2.S3) and the signal line for obtaining a phase voltage signal from the motor (1) and the phase voltage of the motor (1) subject to drive control as shown in FIG. Comparator (A1, A3, A5) for comparing and detecting the positive and negative peak points of each phase from (S1, S2, S3) and generating a corresponding rotation frequency, and the signal lines (S1, S2, Comprising comparator (A2, A4, A6) for comparing and detecting the zero point (Zero) of each phase from S3) and generating the rotational frequency accordingly, and generating the frequency generating signal The part 2 is comprised.

Based on the purpose and configuration of the present invention as described in detail the operation and effects according to the following.

First, when power is applied to the motor 1, which is the driving control object, and the motor 1 is initially driven, the motor generates a phase voltage. Accordingly, the phase voltage signals V, V, V in the frequency generator 2 have a waveform as shown in Fig. 5A made through the signal lines S1, S2 and S3 and the resistors R1 to R3. (A1 to A6) are input respectively.

In order to obtain the phase voltage generated by the motor 1 as a signal, phase and signal lines S1 to S3 are inserted. The resistors R1 to R3 have power of the motor 1 and the signal lines S1 to S3. (R1, R2, R3) has a larger value than that of the motor phase resistance, which prevents the current from flowing from the motor 1 to the signal lines S1 through S3. Motor phase resistance) Normally, R1, R2 and R3 should be larger than 10Ｋ.

Among the comparators A1 to A6 in the frequency generator 2 which received the phase voltage signal of each phase from the preferred lines S1 to S3, the comparators A1, A3, A5 are positive-negative (±) peak points of each phase. The comparator A1 receives the V and V signals of the phase voltage signals V and V to detect the positive and negative peak points, and the comparator A3 is the V and V signals. When the comparator A5 receives the Ｖ and Ｗ signals and detects the positive-negative (±) peak points of the two signals, the comparator (A5) generates a Fulse (Fulse Generation) signal from the intersection of each phase voltage as shown in FIG. Get

It should be noted that when comparing two phases in consideration of switching frequency and FW signal interval, etc., they should be compared in order of Ｕ-Ｖ, Ｖ-Ｗ, Ｗ-Ｕ.

In the comparators A1 to A6 in the frequency generator 2, the comparators A2, A4 and A6 are used to find the zero point of each phase, and the comparators A2, A4 and A6 are the phase voltage signals of V, V, and V, respectively. Is used as the reference value, and ground is used as the reference value to the other side. That is, the comparators A2, A4, and A6 compare Ｕ-Ｇ, Ｖ-Ｇ, and Ｗ- 하여 with the zero voltage of each phase. Is detected, the FW signal is obtained from the zero point of each phase voltage as shown in FIG.

The Fw signal obtained as described above can be used for driving control as it is the signal of 5kW of the amplifier, and it is a very clean signal without noise, and it does not need a separate filter and very fast to the speed change in the accuracy of the Fw signal. Is wearing.

The F signal which is finally output from the pulse generator 2 through the resistors R4-R9 is the sum of the signals detected by the comparators A1, A3, A5 and A2, A4 A6. It is used to increase the frequency, so that the F signal is equally spaced at each speed as shown in (d) of FIG. Therefore, the F signal can obtain up to 12 very precise signals per revolution as shown in (d) of FIG. 5, and the 8-pole precision F signal can be obtained for three-phase to eight-pole motors. Motors with poles above (pole) can't obtain FW of three frequencies, but 12 FW signals can be obtained and can be used for precise drive control.

However, it is difficult to design more than 8 poles because the motor size is very small in the small motor. Therefore, the present invention can obtain a rotational frequency with high resolution of more than 3 high frequencies. .

The frequency generator 2 compares the two phases and separates the comparators A1, A3, A5 for finding the intersection point of positive-negative (±) and relatively (A2, A4, A6) for obtaining the zero voltage of each phase. You can also get the rotation frequency.

As described in detail above, the present invention enables the generation of rotational frequencies that can be used for small precision motors, as well as highly accurate rotational frequencies even at low speeds of 200 rpm or less, and thus the small size of mini-disc headphone cassettes, audio and video, etc. This has the effect of being useful where precision motors are used.

Claims (3)

A signal line for inputting a motor subject to drive control and a phase voltage generated according to the driving of the motor through a resistor (R1, R2, R3) and obtaining a phase voltage signal corresponding thereto, and a positive and negative signal of each phase from the signal line. Comparators (A1, A3, A5) for detecting peak points and generating corresponding rotation frequencies, and relatively (A2, A4, A6) for detecting the zero point (ZERO) of each phase from the signal lines and generating corresponding rotation frequencies. Rotation frequency generator of a small precision motor, characterized in that consisting of. The rotation frequency generator of a small precision motor according to claim 1, wherein the resistances (R1, R2, R3) are larger than 10 kW. The comparator (A1, A3, A5) for detecting the positive-negative (±) peak point of each phase voltage should be compared and detected in the order of V-phase, V-phase and V-phase. Rotation frequency generator of a small precision motor, characterized in that. 4. The method of item 1, wherein the comparators A1, A3 and A5 for comparing and detecting the positive-negative peak points of the phases and the comparators A2, A4 and A6 for comparing and detecting the zero voltages can be configured separately. Rotary frequency generator of small precision motor.