JPS5822955B2 - Motor rotation speed adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor rotation speed adjusting device that can adjust the motor rotation speed in appropriate percentage steps with simple operation and configuration, and can digitally display the motor rotation speed.

1 and 2 are block diagrams showing an example of a conventional motor rotation speed adjusting device.

To explain this, first, in FIG. 1, reference numeral 1 denotes a frequency control type motor which obtains a rotary output proportional to the input frequency, and this includes a speed two-phase synchronized circuit.

A variable frequency oscillator 2 is composed of an unstable multi-by-break, an RC oscillator, etc., and is configured to change the number of revolutions (rotational speed) of the motor 1 by adjusting the oscillation frequency of the variable frequency oscillator 2.

In addition, in FIG. 2, 3 is a programmable frequency divider whose frequency division number can be controlled by external operation;
is a stable reference oscillator using a crystal oscillator or the like.

This is a system in which the oscillation frequency of a reference oscillator 4 is divided by a programmable frequency divider 3, and a frequency-controlled motor 1 is rotated in synchronization with the divided frequency. It is configured to adjust the rotation speed by changing the frequency division number of the frequency generator 3.

However, with the configuration shown in Figure 1, it is difficult to obtain a stable variable frequency oscillator, and since the frequency and therefore the motor rotation speed change in an analog manner, the correspondence between the adjusted rotation speed and its display becomes ambiguous. Easy.

The disadvantage was that the display lacked accuracy.

In addition, in the configuration shown in Figure 2, if a stable oscillator such as a crystal oscillator is used as the reference oscillator, the motor rotation speed can be controlled simply by changing the division number of the programmable frequency divider. Although it is possible to accurately match the division number setting display to the motor rotation speed, the division number and the resulting frequency are inversely proportional to each other. There was a problem that the display did not correspond linearly to the rotational speed of the motor, which did not suit the senses of the person handling the motor.

The present invention provides a rotating motor that eliminates the above-mentioned problems.

This device provides a speed adjustment device that can accurately increase or decrease the motor rotation speed in percent units with a simple configuration and operation, and can also be displayed digitally.

FIG. 3 shows a basic block diagram of the present invention.

To explain this, 5 is a rotation including a rotation speed display function.

6 is a programmable frequency dividing circuit that changes the frequency division number according to the output of the rotation speed adjusting means 5; γ has two input terminals 7a and 7b, and outputs a DC output corresponding to the phase difference between the respective inputs; A phase comparator circuit 8 is a voltage-controlled oscillator whose oscillation frequency is controlled according to the DC output of the phase comparator circuit I, and a part of its output is sent to the phase comparator circuit through a programmable frequency divider circuit 6. It is input to one input terminal 7a of I.

The voltage controlled oscillator 8 operates when the input frequencies of the two input terminals 7a and 7b of the two-phase comparison circuit 7 match and the phase error of the two inputs becomes a constant value. The output voltage of the circuit 7 is controlled to oscillate at a frequency corresponding to the output voltage of the circuit 7.

That is, the programmable frequency divider circuit 6.degree. phase comparator circuit 7. A phase control loop that multiplies the input frequency is configured using the voltage controlled oscillator 8, and if the frequency division number of the programmable frequency divider circuit 6 is M (integer) and the input frequency of the input terminal 7b is f, then this phase control The loop operates to output a frequency M-f that is M times the input frequency.

The frequency-controlled motor 1 is controlled in proportion to the output frequency of the phase control loop, that is, its rotation is controlled in proportion to the value of M.

FIG. 4 is a circuit diagram of a main part of a specific embodiment of the present invention in which the rotation speed of the motor can be adjusted in steps of 0.2%. In particular, the configuration and operation of the programmable frequency dividing circuit 6 are shown. The explanation will mainly be given.

In the same figure, 9, 10, and 11 are each four BcDs.
(binary coded decimal) input terminal a y b + Ct d, four BCD output terminals A, B, C, D, clock input terminal CK, carry or carry down terminal CB, and the above four inputs A binary coded decimal programmable up/down counter that has a load terminal LD for reading the value preset to the terminal av b sc + d and a UD terminal for switching up and down operation. (Progra-mable-Up-Do
wn-Countcr).

Further, 12 is a NAND gate circuit, 13 is a series of three interlocking switches, and 14 is a frequency divider that lowers the output frequency of the voltage-controlled oscillator 8 to a frequency suitable for controlling the motor 1.

In addition, the above-mentioned a, b, c, d and A, B, C.

D corresponds to 2° and 2' y 2'' p 2'', respectively, and the UD terminal is configured to operate as an up counter when it is at logic 1 and as a down counter when it is at logic 0.

Next, referring to FIG. 4, a case will be described in which the rotational speed of the motor 1 is adjusted by 6.4%.

Respective input terminals of counters 10 and 9 a y b +
32° (0011
, 0010) is preset and switch 13 is on the Y side, the UD terminal is at logic 1, so counters 9, 10, and 11 all operate as up counters, and the input pulse at the CK terminal entering counter 9 is initially 32
The count starts from 33, 34, 35, etc., and at the same time as the count reaches 500, a pulse is generated to reset the count by the logic of the NAND gate circuit 12, and the load terminal LD of each counter is output. To give commands, also the first 32 to 33.34.・・・
...and starts counting repeatedly.

Therefore, counters 9, 10, 11 are 468 in this case.
operates as a frequency divider.

And since this frequency divider is incorporated into the phase comparison loop.

The voltage controlled oscillator 8 oscillates at a frequency of 468f, where f is the reference frequency input to the phase comparison circuit 7, and the motor rotates at a rotational speed proportional to the frequency.

In this control, the frequency division number control input is set to 0° (0000,
0000), the counters 9, 10゜11 become -1-frequency divider 00 according to the same principle as mentioned above, so the motor rotates in proportion to the frequency of 500f, and the rotation at this time is If the deviation is O percent based on the number, it will be 468 in the above example. Ωθ” blade JX100=-6°4. That is, it shows that the rotation speed is set to -6.4% of the reference.

Next, a case will be described in which the rotational speed of the motor is adjusted to +6.4%.

The human power to control the frequency division number is still 32, (0011,0010
) and connect the switch 13 to the X side.

In this case, since the preset input terminals a and c of the counter 11 become logic 1, the counters 1, 10, and 9 are preset to 532° (010L0011,0010)'.

Also, since the UD terminal has been switched to logic 0, counters 9, 10, and 11 become down counters, and the input pulse input to the clock terminal CK of counter 9 initially changes from the state of 532 to 531, 530°, 529, . . . ...and the countdown starts, and when it reaches 0, the counter 1 C is opened.
A set pulse is generated from the B terminal, and the counter 1,
The contents of 10,9 are again 532, (0101,0011
, 0010), and then repeat the same operation.

Therefore, the counters 9, 10, and 11 operate as a frequency divider of 11, and when the input reference frequency is f, the voltage-controlled oscillator 8 oscillates at 532f due to the characteristics of the phase control loop.
The motor rotates at a number of revolutions corresponding to this frequency.

The deviation in the rotational speed at this time is as shown before, j
” (Kodan JX100 = +664, +6,
This means that the rotation speed is set to increase by 4%.

As mentioned above, by presetting 32, the rotation speed can be changed by 6.4% from the reference rotation speed, and from 〒i-0,2, it is possible to change the rotation speed by 6.4%. It can be seen that the rotation speed can be increased or decreased by

Further, in addition to this example, by slightly changing the way of presetting the counter and the logic configuration for generating the command signal to the load terminal LD, it is also possible to set the variable step width of the nine revolutions quite freely.

The following table shows an example of the relationship between the variable width of the motor rotation speed and the reference frequency division number when it is 0%.

Although an asynchronous up/down counter is used in the embodiment shown in FIG. 4, a synchronous counter can also be implemented with a similar configuration.

In addition, in the embodiment shown in FIG. 4, the up counter and down counter
Although counter switching and other functions are performed using switches, similar effects can be obtained by replacing these with logic gate circuits.

FIG. 5 shows logic 0 at the frequency division control input terminal of the embodiment shown in FIG.
and a switch 15 for providing a logical 1 level, and a switch 1 for changing the operation of the up counter and down counter.
6 is a circuit configuration diagram of another embodiment of the present invention in which the circuit shown in FIG. 6 is provided, and since the operation is basically the same as that in FIG.

FIG. 6 is a circuit diagram of another embodiment of the present invention in which an automatic scanner (5 scanner) and a display circuit are provided at the frequency division control input terminal in order to more easily adjust the rotation speed.

In the figure, 17 is a switch for setting the rotation speed of the motor 1, and 18 is a switch that generates pulses at regular intervals while the switch 17 is pressed, and when the switch 17 is released, the pulse generation stops. 19 and 20 are counters 9 and 10°1, respectively.
21 is a switch for switching up and down operations of the counters 19 and 20; 22 is a type suitable for displaying the set value to the programmable frequency dividing circuit 6; Decode to fix it (
decode ) circuit.

Note that the display circuit 22 may be constructed of a light emitting diode, a Nixie tube, or the like.

In this embodiment, the programmable frequency divider circuit 6 is composed of three binary coded decimal down counters, and when the preset input of the 2 frequency divider control is 0 or (0000,0000), it becomes a peak frequency divider, and the preset input is configured to be a frequency divider of 450+n when is n (n is a positive integer including 0).

In this example, the first. The contents of counters 20 and 19 are 50
, (0101°oooo), then n=5
0, the programmable frequency divider circuit 6 becomes a 1 frequency divider, and the motor rotates proportionally to the frequency of 500f.

Using the rotational speed at this time as a reference for the deviation O, a case in which the rotational speed is adjusted by +1 percent will be described below.

First, when the switch 21 is set to logic 1 (+5V) and the counters 20 and 21 are up counters, and the switch 17 is pressed, the pulse generator 18 generates a pulse, and the pulse is counted by the counters 19 and 20. Each time a pulse enters the counter 19, the contents of the counter 9.20 are incremented by 1, and since the contents of the counter are connected to the programmable frequency divider circuit 6, the contents of the counter 9.20 are incremented by 1. The number of revolutions increases, resulting in an increase in the number of rotations of the motor.

When the switch 17 is released, the pulse output of the pulse generator 18 disappears, so the contents of the counter 9.20 stop increasing, and as a result, the motor continues to rotate at the rotation speed set at the time when the increase stopped.

In the case of this embodiment, if the switch 17 is released when the pulse generator 18 has outputted five pulses, the contents of the counters 19 and 20 will increase by 5 from the reference state to 55, so the programmable frequency divider circuit 6 becomes the r-1 frequency divider, and the motor has a frequency of 505f.
It rotates in proportion to f-50Of.--1,,xlO0 =1. In other words, this indicates that the rotational speed has increased by +1%.

At this time, the number of revolutions is displayed on counters 19 and 20 A, B,
If the decoding circuit 22 and display circuit 23 are configured so that the logic of the C and D outputs matches the percentage value,
The rotation speed can be set accurately with very simple operation.

To decrease the rotation speed, set the switch 21 to logic 0 (ground) and perform the same operation. Counters 19 and 20 will become down counters, and their contents will decrease, so the motor can be controlled using the same principle as above. The rotation speed of will decrease.

Note that instead of the counters 19 and 20 having the up and down operation switching terminals UD described in the above embodiments, a counter having two clock inputs, an up-count clock input and a down-count clock input, is used. If used, a switch for up-counting and a switch for down-counting can be provided separately to increase or decrease the contents of the counter, and it is thought that the operation will be made easier.

Further, although the present embodiment has been described using a binary coded decimal programmable counter, the present invention is not limited to this, and a similar device can be constructed by combining a normal 1/2 frequency divider.

Furthermore, if the rotation speed adjustment means is not limited to the simple switches and up/down counters mentioned in this embodiment, but is constructed from logic circuits with nine various functions, it becomes possible to interface with a microprocessor, etc. A high degree of control can be performed.

In addition, as the frequency control type motor described in this example, a motor with phase control that is easy to obtain stable operation is suitable, but there are also other types of motors such as hysteresis synchronous motors that are supplied with the motor itself. Motors that rotate in synchronization with the frequency of the power supply can also be used.

As described above, the present invention allows the rotation speed of the motor to be varied in appropriate percentage steps with a simple configuration and operation, and can be displayed accurately. It can be applied as an adjustment device, and its effects are very large.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an example of a conventional motor rotation speed adjusting device, FIG. 3 is a basic block diagram of the present invention, and FIGS. 4, 5, and 6 are respectively in accordance with the present invention. FIG. 2 is a main circuit configuration diagram showing an embodiment of the present invention. 1... Frequency control type motor, 5...
Rotation speed adjusting means, 6... programmable frequency dividing circuit, 7... phase comparison circuit, 8... voltage controlled oscillator.

Claims (1)

[Claims] 1. A motor having a rotation speed adjusting means capable of adjusting the rotation speed of the motor, a programmable frequency dividing circuit controlled by the output of the rotation speed adjusting means, and two input terminals, each having two input terminals. A phase comparison circuit that generates a DC voltage corresponding to the phase difference of the input, a voltage controlled oscillator whose oscillation frequency is controlled according to the output voltage of the phase comparison circuit, and a frequency that produces a rotational output proportional to the input frequency. a controlled type motor, and a part of the output of the voltage controlled oscillator is applied to one input terminal of the phase comparison circuit through the frequency dividing circuit, thereby applying it to the other input terminal of the phase comparison circuit. The device comprises a phase control loop that multiplies the frequency of an input signal, and adjusts the rotational speed of the motor with the output of the voltage controlled oscillator, wherein the rotational speed adjusting means adjusts the rotational speed of the motor. The programmable frequency dividing circuit includes a display means for digitally displaying a number, and the frequency division number of the programmable frequency dividing circuit is changed by one step at a time with N (N being an integer) as a center in response to a command from the rotation speed adjusting means. When the rotational speed of the motor is changed at a predetermined rate around the rotational speed at N, the actual changed percentage value of the motor rotational speed matches the value displayed on the display means. The motor rotation speed adjustment device is characterized by its configuration. 2. In the description of claim 1, N-n,
2n, 4n, 5n (fold, n210°1.00
, 1,000.
. A motor rotation speed adjusting device characterized in that the rotation speed can be adjusted in percentage steps. 3% In the description of claim 2, n-100
0, respectively 0.1゜0.05 and 0
．． 025. A motor rotation speed adjusting device characterized in that the rotation speed can be adjusted in steps of 0.02%. 4% Allowance The motor rotation speed adjusting device according to claim 1, 2, or 3, characterized in that the frequency-controlled motor is a motor subjected to two-phase control. . 5. The motor rotation speed adjusting device according to claim 1, 2, or 3, characterized in that a hysteresis synchronous motor is used as the frequency control type motor.