JP2012039865A - Motor controller of pointer-type indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor controller used for a mechanical analog-type indicator, capable of realizing a pointer-type indicator that is visually comfortable by allowing a pointer to move smoothly.SOLUTION: When a data reception unit 10 receives plural pieces of data Da that are sequentially inputted at predetermined intervals, a motor drive control unit 11 calculates a rotation amount of a pointer from at least the initially-received data Da and the lastly-received data Da among the received plural pieces of data Da, and sets a period from reception of the initial data Da to reception of the last data Da as a movement period of the pointer. The motor drive control unit 11 calculates a rotation speed that allows the pointer to continuously rotate for the above movement period by the above rotation amount, and that lowers its speed during start and end periods of the movement period as compared with an intermediate period of the movement period, and controls a motor drive unit 12 so that the pointer rotates at the above rotation speed.

Description

  The present invention relates to a motor control device used for a pointer-type display that displays a ship speed or the like.

  Conventionally, there has been an analog display device that calculates pointer position data based on input data and displays a pointer image at a position corresponding to the pointer position data on a display screen (see, for example, Patent Document 1). The analog display device includes an A / D conversion unit that converts an input analog signal into a digital signal, and a control unit that calculates pointer position data based on the digital signal converted by the A / D conversion unit. On the screen, a pointer image is displayed at a position corresponding to the pointer position data calculated by the control unit. In this analog display device, the pointer position data is calculated so as to show the response of the first-order lag system or the second-order lag system with respect to the input data, so that even if the input data changes suddenly, it is displayed on the screen. However, this display device displays the pointer image on the screen and is not a mechanical analog display device (so-called analog meter).

  On the other hand, as a mechanical analog display device, there has been proposed a digital / analog display device that displays a measured quantity such as a vehicle speed of a vehicle by digital display using numbers and analog display using hands (for example, see Patent Document 2). . This digital / analog display device is a digital display that displays numbers using a three-digit 7-segment device composed of a fluorescent display tube, LCD, etc., and an analog that indicates the scale by rotating the pointer with a pulse motor. And a display. The digital display updates the numeric display according to the measurement data, and the analog display calculates and displays the scale corresponding to the digital display's numeric display by processing the same measurement data as the digital display. Therefore, the indication display of the pointer on the analog display can be made to coincide with the numerical display on the digital display.

JP 2004-271343 A (paragraph [0011] -paragraph [0022] and FIGS. 1 to 2) JP-A-6-129877 (paragraph [0012] -paragraph [0014], paragraph [0037] -paragraph [0042], and FIGS. 1 to 2)

  The analog display device disclosed in the above-mentioned Patent Document 1 can smoothly move the pointer image displayed on the screen even when the input data changes abruptly, but the input data is captured. Since the pointer image is not moved over a predetermined period, there is a problem in that the pointer image repeats movement and stop, and the pointer does not appear to move smoothly.

  In the latter digital / analog display device shown in Patent Document 2, measurement data is taken every display update time, and the pointer is rotated based on the measurement data. Since the next measurement data is unknown, when the pointer is rotated at the maximum speed of the motor, the target instruction position is reached before the next measurement data is captured. As a result, there has been a problem that the pointer becomes a movement that repeats rotation and stop, and the pointer does not appear to move smoothly.

  The present invention has been made in view of the above-mentioned problems, and its object is to provide a pointer-type display that is used for a mechanical analog display and that does not feel strange by moving the pointer smoothly. It is providing the motor control apparatus which implement | achieves a device.

  A motor control device for a pointer-type display of the present invention includes a motor for moving a pointer, a motor driving unit for driving the motor, a data receiving unit for receiving data for determining a pointer position every predetermined time, and data A motor drive control unit that controls the motor drive unit based on the data received by the reception unit. When the data receiving unit receives a plurality of data sequentially input every predetermined time, the motor drive control unit calculates the movement amount of the pointer from at least the first received data and the last received data among the received data. At the same time, the time from when the first data is received until the last data is received is set as the movement time of the pointer. The motor drive control unit is a moving speed for continuously moving the pointer by the moving amount in the moving time, and the start period and the end period of the moving time are lower than the intermediate period of the moving time. The moving speed is calculated, and the motor driving unit is controlled so that the pointer moves at the moving speed.

  There is an effect that it is possible to provide a motor control device that is used in a mechanical analog display and that realizes a pointer-type display that does not feel strange by visually moving the pointer.

It is a block diagram of the motor control apparatus of this embodiment. (A), (b) is an external view of a pointer type display using the same. It is explanatory drawing explaining operation | movement same as the above. It is another explanatory drawing explaining operation | movement same as the above. (A), (b) is another explanatory drawing explaining operation | movement same as the above.

  An embodiment of a motor control device will be described with reference to the drawings. The motor control device 1 of the present embodiment is a pointer-type display for a ship that performs analog display using a pointer based on detection data input from a sensor that detects information such as wind direction, wind speed, ship speed, water depth, or heading. Used in a vessel. The application is not limited to ships.

  As shown in FIG. 1, the motor control device 1 includes a motor 13 for normal rotation or reverse rotation of a pointer 4 (see FIG. 2) attached to an output shaft (not shown), and a motor drive for driving the motor 13. Unit 12, data receiving unit 10 that receives data Da output from sensor 3 every predetermined time (hereinafter referred to as a cycle), and motor driving unit 12 based on data Da received by data receiving unit 10. And a motor drive control unit 11 for performing the operation. In this embodiment, one period is set to 100 ms (see FIG. 4).

  The data receiving unit 10 is an interface circuit for taking in the data Da output from the sensor 3 to the motor drive control unit 11. In this embodiment, the data receiving unit 10 uses, for example, an NMEA2000 interface conforming to the CAN communication standard. Here, the CAN communication standard is an international standard for vehicle communication and can perform data communication between a plurality of electronic control units on the same communication line. NMEA2000 conforms to this CAN communication standard. It is a network standard for marine electronic devices. Therefore, any sensor compatible with NMEA2000 can be connected to the pointer-type display of this embodiment.

  The motor drive control unit 11 is configured by a microcomputer, for example, and each time the data reception unit 10 receives a plurality (two in this embodiment) of data Da, the pointer 4 is based on the received two data Da. And the time from receiving the first (first) data Da to receiving the second (last) data Da is set as the movement time of the pointer 4. Further, a rotation speed for rotating the pointer 4 by the rotation amount during this movement time is calculated, and a pulse signal is output according to the movement time, the rotation amount, and the rotation speed. For example, in one cycle from 0 ms to 100 ms in FIG. 4, the rotation amount and the rotation speed are calculated based on the current data Da of the position a of the pointer 4 and the data Da of the target position b of the pointer 4. In this embodiment, the travel time is set to 100 ms.

  The motor drive unit 12 is, for example, a driver circuit, and supplies pulsed power to a motor 13 made of, for example, a stepping motor, according to the pulse signal output from the motor drive control unit 11.

  The data receiving unit 10, the motor drive control unit 11, the motor drive unit 12, and the motor 13 described above are housed in the case 2. The case 2 is formed in a substantially rectangular box shape as shown in FIG. 2A, and has a scale 5 on the front side of the case 2 and is attached to the output shaft of the motor 13 by an appropriate attachment means. A substantially circular analog display unit 20 is provided for instructing and displaying detection data from the sensor 3 by rotating 4. A plurality (four in this embodiment) of function switches 6 are provided below the analog display unit 20.

  Here, the motor control device 1 of the present embodiment is proportional to the rotational speed of the pointer 4 from 0 to V1 in the section from time 0 ms to time t5 (0 ms <t5 <100 ms) as the start period as shown in FIG. (I.e., low speed start), and is set to a constant speed V1 (i.e., high speed) in the interval from time t5 to time t6 (0 ms <t5 <t6 <100 ms), which is an intermediate period, and further from time t6, which is the end period In the section of time 100 ms, it is decreased proportionally from V1 to 0 (that is, deceleration stop).

  FIG. 4 shows the position of the pointer 4 in one cycle from time 0 ms to time 100 ms, the solid line D shows this embodiment, and the alternate long and short dash line E shows the case where the pointer 4 is rotated at a constant rotational speed. Yes. A two-dot chain line F indicates the maximum rotation speed of the motor 13. When the pointer 4 is rotated at a constant rotation speed, the rotation amount increases linearly, whereas in the motor control device 1 of the present embodiment, the start period of the movement time (100 ms in the present embodiment). Since the rotation speed of the end period is low, the amount of rotation changes in a curved manner as shown in FIG. 4, and no out-of-step occurs in the rotor portion of the motor 13 having inertia in the start period. Further, since the needle 4 can be prevented from overshooting (overshoot) in the end period, the pointer 4 can always be indicated accurately, and therefore the pointer-type display motor control device 1 with improved indication accuracy of the pointer 4 can be provided. Can be provided. Further, by increasing the rotation speed in the intermediate period of the movement time, the pointer 4 can be smoothly rotated over the movement time in the same manner as when the pointer 4 is rotated at a constant rotation speed. Therefore, it is possible to provide the motor control device 1 of the pointer type display that does not feel uncomfortable. In the motor control device 1 of the present embodiment, the rotational speed of the motor 13 is decelerated during the end period of the movement time, and the pointer 4 stops at the deceleration end. Compared with, it is a very short period.

  Next, another example of the present embodiment will be described with reference to FIG. FIG. 5A shows the rotation speed of the pointer 4 for two cycles. In one cycle from 0 ms to 100 ms, the rotation speed is from 0 to V1 in a section from time 0 ms to time t5 (0 ms <t5 <100 ms). Rises proportionally, reaches a constant speed V1 in the interval from time t5 to time t6 (0 ms <t5 <t6 <100 ms), and further decreases proportionally from V1 to 0 in the interval from time t6 to time 100 ms. In one cycle from 100 ms to 200 ms, the rotation speed increases proportionally from 0 to V2 in the section from time 100 ms to time t7 (100 ms <t7 <200 ms), and from time t7 to time t8 (100 ms <t7 <t8). <200 ms) has a constant speed V2, and further decreases proportionally from V2 to 0 in the interval from time t8 to time 200 ms. Thus, when the rotational speed of the pointer 4 is calculated for each period in this way, the pointer 4 temporarily stops at the time of 100 ms as shown in FIG.

  Therefore, every time the data receiving unit 10 receives the three data Da (that is, every time two cycles elapses), the first (first) and third ( When the rotation speed of the pointer 4 is calculated based on the last data Da, as shown in FIG. 5 (b), it increases proportionally from 0 to V2 in the section from time 0 ms to time t9 (0 ms <t9 <100 ms). Then, the speed is constant V2 in the section from time t9 to time t10 (0 ms <t9 <100 ms <t10 <200 ms), and can be controlled to decrease proportionally from V2 to 0 in the section from time t10 to time 200 ms. Therefore, as shown in FIG. 5A, since the pointer 4 is not stopped at the time of 100 ms, the pointer 4 can be rotated more smoothly. In the present embodiment, the rotation speed of the pointer 4 is calculated using the first and last data Da, but the three data including the data Da (that is, the second data Da) received in between are calculated. The rotation speed of the pointer 4 may be calculated based on the data Da.

  As described above, in the pointer-type display of the present embodiment, every time the data receiving unit 10 receives a plurality of data Da, the rotation speed is obtained based on the received plurality of data Da, and the above movement is performed at the obtained rotation speed. Since the pointer 4 is rotated over time, the movement of the pointer 4 does not repeat the rotation and stop as in the conventional example, and the pointer 4 can be smoothly rotated. It is possible to provide a motor control device 1 for a pointer-type display that is not provided. In addition, the rotational speed of the start period and end period of the moving time is set to be lower than that of the intermediate period of the moving time, and in the start period, the rotor portion of the motor 13 having inertia can be stepped out. In addition, since it is possible to prevent the needle 4 from being excessively passed during the end period, it is possible to always indicate the pointer 4 accurately, and thus to provide a motor control device 1 for a pointer-type display with improved indication accuracy of the pointer 4. be able to.

  In the present embodiment, the timing at which the motor drive control unit 11 performs the arithmetic processing is synchronized with the timing at which the data receiving unit 10 receives the data Da, but the timing at which the arithmetic processing is performed is limited to the present embodiment. Instead of this, it may be performed after the last data Da used for the arithmetic processing is received until the next data Da is received. Further, the number of data Da used for the arithmetic processing by the motor drive control unit 11 is not limited to two or three as in the present embodiment, and may be four or more.

  Furthermore, in the present embodiment, the case where a stepping motor is used as the motor 13 has been described as an example. However, for example, a cross coil motor may be used.

  Further, in the present embodiment, the pointer type display (see FIG. 2A) including only the mechanical analog display unit 20 has been described as an example. As shown in FIG. 2B, a pointer-type display provided with both an analog display unit 20 using hands and a digital display unit 7 using numbers may be used. Further, the pointer type display is not limited to the rotary type, and may be a pointer type display that reciprocally moves the pointer linearly, for example.

  Further, in the present embodiment, the movement amount of the pointer 4 is calculated from the first and last data Da among the plurality of received data Da and from the reception of the first data Da to the reception of the last data Da. The movement time of the pointer 4 is calculated from the above time. For example, characteristic values such as a maximum value, a minimum value, and a maximum amount of change are extracted from a plurality of data Da, and based on this extracted value. The movement amount and movement time of the pointer 4 may be calculated.

10 Data receiving unit 11 Motor drive control unit 12 Motor drive unit Da Data

Claims (1)

A motor for moving the pointer, a motor driving unit for driving the motor, a data receiving unit for receiving data for determining the pointer position every predetermined time, and the data receiving unit based on the data received A motor drive control unit for controlling the motor drive unit,
When the data receiving unit receives a plurality of the data sequentially input every predetermined time, the motor drive control unit receives at least the first received data and the last received data among the plurality of received data. The movement amount of the pointer is calculated, and the time from reception of the first data to reception of the last data is set as the movement time of the pointer, and the pointer is moved by the movement amount in the movement time. The movement speed is a continuous movement speed, and the movement speed is calculated such that the start period and the end period of the movement time are lower than the intermediate period of the movement time so that the pointer moves at the movement speed. A motor control device for a pointer-type display, wherein the motor drive unit is controlled.

Images