JP5298466B2 - Motor speed display method - Google Patents

Description

  The present invention relates to a motor speed display method, and more particularly to a motor speed display method in which a motor speed is digitally displayed by a plurality of display elements.

  The motor speed control device is equipped with switching setting means for making various settings according to the operation and display means for identifying various states such as normal operation and occurrence of an abnormality. Conventional display means such as a light emitting diode (LED) and a 7-segment display capable of single digit display are widely used. However, in order to display the status of the motor speed control device, a plurality of display means can be used with as few display means as possible. It has been desired to display the status.

  For example, according to the operation state display method of the variable speed drive device of Patent Document 1, a 7-segment display is adopted as means for displaying the operation state such as speed and frequency. However, the 7-segment display has a problem that it has a large shape, is easily subject to restrictions on the arrangement of the motor speed control device, and is expensive.

  Therefore, a two-color light emitting element (LED) is used for the display of the motor speed control device, and the motor and the motor speed control device are provided with a number of state display patterns obtained by the color of the light emitting element, lighting, extinguishing, and blinking. It is considered to display each state and the contents thereof (for example, see Patent Document 2). However, when displaying the status at the blinking speed of a light emitting element, etc., there is a disadvantage that the actual speed cannot be known even if the feeling of the approximate speed can be grasped because the accurate speed display is not performed. .

  Thus, in a small motor control device in which the output of the motor is several hundred watts or less, it is required that the motor speed control device itself has a small size and a low price. On the other hand, depending on the use of the motor, there are many demands for reading the actual motor speed more accurately.

  As a motor speed control device based on the desire to easily display numerical information of a large number of digits without using a 7-segment display or the like, a device provided with the following setting switch and status display is considered. (For example, refer to Patent Document 3).

  FIG. 10 is a diagram illustrating an example of a motor speed control device including a conventional setting switch and a status indicator. In the figure, the status indicator 101 includes one two-color light emitting LED labeled “REF” and three single-color light emitting LEDs labeled “AL1,” “AL2,” and “AL3.” Consists of two 16-point setting rotary switches labeled “RSW1” and “RSW2”, which together constitute a motor speed control device.

  In “REF” of the status indicator 101, in addition to two colors “green” and “orange”, one color “yellow” which is turned on simultaneously is used, and three colors are used. By doing so, a maximum of seven types of status display can be performed. In addition, “AL1”, “AL2”, and “AL3” use a single “red” color, and can turn on, turn off, and blink each to display a maximum of 24 types of status.

  “RSW1” of the setting switch 102 is a constant setting switch for setting a control constant for the position control system and the speed control system, and “RSW2” is a condition setting switch for setting an operation command condition input from the host device. .

FIG. 11 is a display example of numerical information in the status display mode of the status indicator 101 of FIG. In FIG. 11, “AL1”, “AL2”, and “AL3” indicate that “●” is lit, “◯” is unlit, and “☆” is blinking. With these combinations, a maximum of 24 types of display can be performed, and more information can be displayed by assigning not only numerical information but also meanings such as symbols and characters. In this example, numerical information from “0” to “9” is assigned.
Japanese Patent Laid-Open No. 63-114589 (from page 2, upper right orchid second line to right lower orchid first line, FIG. 2) JP 09-114413 A (paragraph numbers [0011] to [0016]) JP 2006-296041 A (paragraph numbers [0014] to [0028], FIG. 2 and the like)

  However, in the conventional status display, one character is displayed by a combination of turning on / off / flashing of several display elements (LEDs, etc.) as means for displaying numerical or character information, and the display is sequentially updated to update the speed. Was to be displayed. For this reason, there is a drawback that the speed is not easily understood at first glance. Further, it is necessary to selectively switch between the speed display and the display in another state, and there is a drawback that the operation becomes complicated.

The present invention has been made in view of these points, and an object of the present invention is to provide a motor speed display method that requires only a small installation space for equipment and is inexpensive.
Another object of the present invention is to provide a motor speed display method capable of grasping an accurate motor speed at first glance.

In the present invention, in order to solve the above problem, in the motor speed display method for displaying the motor speed, a display comprising speed control means for setting and controlling the motor speed and a display element for a plurality of digits for displaying the motor speed. And when the motor speed is displayed, the display means is controlled to blink for each display element for the number of times corresponding to each digit value, and after the display lighting of the digit with the largest number is finished. It provided non-lighting period of a constant length, and a variable unit period for performing off control for each display cycle of repeating the display device, and displaying the motor speed to vary the motor A speed display method is provided.

  In the motor speed display method of the present invention, the display means is constituted by the same number of display elements as the number of digits of the speed display value N digits (N is an integer of 2 or more) of the motor speed, or the speed display. It is composed of (N−a) display elements (a is an integer of 1 or more) smaller than the number of digits of the value N, and among the N digits of the speed display value, all or (N−a) Each display element is assigned and displayed.

According to the motor speed display method of the present invention , the speed display is easy to see and accurate, for example, with a small and inexpensive device , the waiting time between display cycles is reduced, and the change state of the motor speed can be determined more accurately. Speed display is possible.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a motor speed control apparatus according to Embodiment 1 of the present invention.

  The motor speed control device 1 is supplied with power from a power source 2 and controls the operation of the motor 3 at a predetermined speed. The speed control circuit 11, the control microcomputer 12, the speed setting circuit 13, and the speed display unit 14 are used. It is composed of Here, four display elements LED1 to LED4 are provided in the speed display unit 14, and each of the display elements LED1 to LED4 has a display speed [r / m] of 1,000, 100, 10 The first place is assigned.

  The speed setting circuit 13 receives a setting signal input from a start button or a speed setting switch (not shown) and outputs a set speed value of the motor speed to the control microcomputer 12. The actual speed value of the motor 3 is fed back from the speed detection circuit 31 to the control microcomputer 12, and a control command corresponding to the difference from the set speed value is instructed to the speed control circuit 11 from here.

  The control microcomputer 12 has a speed control program as speed control means for setting and controlling the motor speed, and a display control program for controlling the speed display unit 14. The four display elements LED1 to LED4 are controlled to blink by the number of times corresponding to each digit value within a predetermined time by this display control program, and the actual speed value of the motor 3 is digitally displayed.

FIG. 2 is a timing chart showing a blinking control signal supplied to each display element of the first embodiment.
Here, each of the four display elements LED1 to LED4 is instructed by the control microcomputer 12 by repeating a blinking operation of turning on (ON) for 0.5 seconds and turning off for 0.5 seconds at a constant cycle. Each digit of motor speed is digitally displayed. If each of the display elements LED1 to LED4 is made to correspond to a 4-digit number display, the maximum value of the number of flashes thereof is “9”, and therefore, it is only necessary to flash 12 seconds as one cycle.

  For example, when the actual speed value of the motor 3 is 1423 [r / m], the LED 1 at the 1000's place is 1 corresponding to each digit value “1”, “4”, “2”, “3”. The second LED is lit once, the second LED2 is repeated four times, the tenth LED3 is repeated twice, and the first LED4 is repeated three times. Four seconds after the start of lighting, the LED 2 blinks four times, and then all the display elements LED1 to LED4 are turned off for 8 seconds. In the meantime, when a display value of a new motor speed is instructed from the control microcomputer 12, another digital value is displayed in the next display cycle.

  By controlling the display elements LED1 to LED4 to blink as described above, a four-digit speed display can be performed with only four display elements. Therefore, a motor speed display device can be realized at a lower space and at a lower cost than a conventional 7-segment display. In the display method according to the above-described embodiment, the speed value can be determined by simply counting how many times the display elements LED1 to LED4 of each digit blink. Therefore, the speed value can be easily read as compared with the conventional state display by the combination of lighting, extinguishing, and blinking. Furthermore, since each display element LED1-LED4 corresponding to each digit value displays the motor speed according to the number of blinks, an accurate speed value can be displayed.

  In the motor speed control device 1 of FIG. 1, the speed display device that digitally displays the actual speed value of the motor 3 has been described. However, the set speed value from the control microcomputer 12 can also be displayed. Further, the set speed value and the actual speed value may be switched and displayed.

(Embodiment 2)
FIG. 3 is a block diagram showing the configuration of the motor speed control apparatus according to the second embodiment of the present invention. Portions corresponding to those shown in FIG. 1 are denoted by the same reference numerals.

  Here, the difference from the motor speed control device 1 of FIG. 1 is that only three display elements LED1 to LED3 are arranged in the speed display unit 14. When the motor speed control device 1 is used for driving a fan motor or the like, it is not necessary to have a place of 1 as the resolution of speed display, and it may be sufficient to display only the upper 3 digits. In this case, the display elements LED1 to LED3 are assigned 1000, 100, and 10 positions of the display speed [r / m] indicating the actual speed value or the set speed value.

FIG. 4 is a timing chart showing a blinking control signal supplied to each display element of the second embodiment.
The three display elements LED1 to LED3 are controlled to blink by the number of times corresponding to each digit value within a predetermined time by the display control program of the control microcomputer 12. In FIG. 4, when the actual speed value of the motor 3 is 1423 [r / m], the LED 1 at the 1000's place is 1 corresponding to the upper three digits “1”, “4”, “2”. The LED is turned on only once, and the LED 2 at the 100th place repeats blinking 4 times, and the LED 3 at the 10th place is blinked twice.

  As in the motor speed control device 1 of FIG. 3, the speed display unit 14 is provided with the three display elements LED1 to LED3 to display the motor speed value. Space saving and low cost can be configured. Further, since it is only necessary to read the digital values for the upper three digits, reading of the speed display becomes easy.

(Embodiment 3)
FIG. 5 is a block diagram showing the configuration of the motor speed control apparatus according to the third embodiment of the present invention.

  Here, like the motor speed control device 1 of FIG. 3, three display elements LED <b> 2 to LED <b> 4 are arranged in the speed display unit 14. The difference from the display device according to the second embodiment is that each LED is assigned the 100th, 10th, and 1st place of the display speed [r / m] indicating the actual speed value or the set speed value. It is a point.

  In such a motor speed control device 1, since a digit corresponding to 1000 [r / m] is not displayed, whether or not the motor is rotating at 1000 [r / m] or more only from the speed display unit 14. I do n’t know. However, the motor speed control device 1 is used for driving a fan motor and the like, and by actually observing the movement of the fan or the strength of the wind, even if the display by the speed display unit 14 is not displayed, 1000 [ r / m] or more can be determined.

FIG. 6 is a timing chart showing a blinking control signal supplied to each display element of the third embodiment.
Assume that it is determined that the motor is rotating at about 1000 [r / m] due to the movement of the fan. At this time, if it can be assumed that the display of the hundreds place is about 6 to 9 and the motor speed is slightly lower than 1000 [r / m], then the place of 1000 is displayed as 0. Not too long.

  On the contrary, as shown in FIG. 6, if the display of the hundreds place is 4 and the motor speed can be estimated to be slightly higher than 1000 [r / m], the actual speed value is 1423 [r / m]. It can be judged that. In other words, in that case, it is not necessary to display 1 in the thousands on the speed display unit 14.

  As described above, in the motor speed control device 1 according to the third embodiment, since the three display elements LED2 to LED4 are provided in the speed display unit 14 and the motor speed value is displayed, it is compared with the first embodiment. In addition, it is possible to configure further space saving and low cost. Further, since it is only necessary to read the digital value for three digits, it is easy to read the speed display.

(Embodiment 4)
FIG. 7 is a timing chart showing a blinking control signal supplied to each display element according to the fourth embodiment.

  In the display method of the first embodiment, the display cycle is set to a certain time, for example, 12 seconds. However, if the number of blinks of the display elements LED1 to LED4 is small, the waiting time until the next display cycle becomes long. In the fourth embodiment, therefore, the extinguishing time (t3 to t2) until the start of the next cycle after the display lighting of the display element LED2 of the digit with the highest number (100's place) is finished is a certain time ( For example, 3 seconds).

  For example, when the actual speed value of the motor 3 is 1423 [r / m], the LED 1 at the 1000's place is 1 corresponding to each digit value “1”, “4”, “2”, “3”. The second LED is lit once, the second LED2 is repeated four times, the tenth LED3 is repeated twice, and the first LED4 is repeated three times. That is, after time t3 when the LED 2 that displays the maximum numerical value finishes blinking display for 3.5 seconds, all the display elements LED1 to LED4 are turned off for 3 seconds, and the next display cycle is started. Therefore, the display cycle (t1 to t2) is shortened by 5.5 seconds as compared with the display method of the first embodiment.

  With such a display method, when the number of each digit is small, the motor speed can be repeatedly displayed in a shorter time compared to the motor speed display in which the fixed period is one cycle. Therefore, the waiting time between display cycles is reduced, and a display that is easy to see, such as a more accurate determination of the state of change in the motor speed, is possible.

(Embodiment 5)
FIG. 8 is a timing chart showing a blinking control signal supplied to each display element of the fifth embodiment.

  In the display method of the first embodiment, the display cycle is set to a certain time, for example, 12 seconds. However, when the motor speed itself is low, the number of blinking display elements LED1 to LED4 is reduced and the number of blinking times is also reduced.

  Therefore, in the display method of the fifth embodiment, all digits are not blinked at the same time, but the timing is shifted from the display element LED1 that displays the number of upper digits to the lower display elements LED2 to LED4 in order, and blinks one digit at a time. it's shown.

  For example, when the actual speed value of the motor 3 is 1423 [r / m], the LED 1 at the 1000's place is 1 corresponding to each digit value “1”, “4”, “2”, “3”. Then, the 100th LED2 blinks four times, then the tenth LED3 blinks twice, and the first LED4 blinks three times. When time t2 at which the speed display for one cycle is finished in this way, the next one cycle is immediately started and lighting is started from the LED 1 at the 1000th place. Therefore, the display time of 1423 [r / m] is 10 seconds (= 1 + 4 + 2 + 3).

  In such a display method, if the motor speed is low, the display cycle itself can be shortened. Even when the display digit of the motor speed is increased to increase the display accuracy, only one display element always flashes, so that the speed display is easy to see.

(Embodiment 6)
FIG. 9 is a timing chart showing a blinking control signal supplied to each display element of the sixth embodiment.

  When the motor speed control device is in a normal operating state, the display element is controlled to blink as described in the above embodiments. If an abnormality occurs in the motor speed control device at time t4, all the display elements LED1 to LED4 are continuously lit to display that fact.

  In such a motor speed display method, it can be determined at a glance whether the motor is operating normally by the motor speed control device or whether the motor is stopped due to the occurrence of an abnormality. In addition, the display elements LED1 to LED4 are not lit all at the time of continuous lighting in the event of an abnormality, but it is also possible to display only one of the LEDs to distinguish the abnormal contents when the motor is stopped. is there.

It is a block diagram which shows the structure of the motor speed control apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a timing diagram showing a blinking control signal supplied to each display element in the first embodiment. It is a block diagram which shows the structure of the motor speed control apparatus which concerns on Embodiment 2 of this invention. FIG. 10 is a timing diagram illustrating a blinking control signal supplied to each display element according to the second embodiment. It is a block diagram which shows the structure of the motor speed control apparatus which concerns on Embodiment 3 of this invention. FIG. 10 is a timing diagram showing a blinking control signal supplied to each display element in the third embodiment. FIG. 10 is a timing diagram illustrating a blinking control signal supplied to each display element according to the fourth embodiment. FIG. 10 is a timing diagram illustrating a blinking control signal supplied to each display element according to the fifth embodiment. FIG. 29 is a timing diagram illustrating a blinking control signal supplied to each display element according to the sixth embodiment. It is a figure which shows an example of the motor speed control apparatus provided with the conventional setting switch and the status indicator. It is a display example of the numerical information in the status display mode of the status indicator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor speed control apparatus 2 Power supply 3 Motor 11 Speed control circuit 12 Control microcomputer 13 Speed setting circuit 14 Speed display part LED1-LED4 Display element

Claims (6)

In the motor speed display method for displaying the motor speed,
Speed control means for setting and controlling the motor speed;
Display means comprising a display element for a plurality of digits for displaying the motor speed;
The provided, when displaying the motor speed, with only off control for each of the display device a number of times corresponding to the display means to the respective digit number, one fixed length after the end of the most number of high digit display lighting provided non-lighting period is, as a variable unit period for performing off control for each display cycle of repeating the display device, the motor speed display method characterized by displaying the motor speed to vary .   2. The motor speed display method according to claim 1, wherein the display elements are controlled to blink according to a set speed value set by the speed control means.   2. The motor speed display method according to claim 1, wherein the display elements are controlled to blink according to an actual speed value controlled by the speed control means. The display means is constituted by (N−a) display elements (a is an integer of 1 or more) less than N digits (N is an integer of 2 or more) of the speed display value of the motor speed,
The motor speed display method according to claim 1, wherein (N−a) of N digits of the speed display value are assigned to the respective display elements for display.   5. The motor speed display method according to claim 4, wherein (N−a) digits are assigned to each of the display elements in order from the most significant digit among the N digits of the speed display value.   5. The motor speed display method according to claim 4, wherein (N−a) digits are assigned to each of the display elements in order from the lowest digit among the N digits of the speed display value.

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