JP5089297B2 - Elevator equipment - Google Patents

Description

The present invention relates to an elevator apparatus , and more specifically, a motor that drives a hoist to raise and lower a car, and detects the rotational state of the rotating shaft of the motor and outputs the detection output to the motor electronically. The present invention relates to an elevator apparatus that includes a rotary encoder that outputs to an electronic control device that includes a control CPU.

  For example, in an electronic control system that electronically controls an elevator apparatus, a rotary encoder is attached to a motor shaft of a drive motor that drives a car up and down, and a detection signal of the rotary encoder is input to the electronic control apparatus. The electronic control device drives and controls the driving motor by a detection signal from the rotary encoder to control the raising / lowering of the car (for example, see Patent Document 1). In this electronic control system, the safety of the electronic control system is mainly achieved by the control operation of the control CPU incorporated in the electronic control device. The control CPU controls various loads in response to control programs, various control constants, and operating states of various input sensors.

In the above configuration, it is conceivable that the electronic control device side additionally includes a determination program for performing a certain determination on the control CPU based on the presence / absence of a detection signal, the signal waveform, etc. in the various states on the rotary encoder side. The additional installation of the determination program and the execution of the determination program increase the burden on the control CPU and cause a delay in electronic control speed and an increase in cost.
Japanese Patent Application Laid-Open No. 09-077412

  Therefore, the present applicant has developed a rotary encoder that can self-diagnose the state of the rotary encoder itself. In this case, if the rotary encoder is in an abnormal state when the self-diagnosis signal is input from the rotary encoder to the electronic control device, the electronic control device side needs to take time to take necessary measures for system operation. Easy to lose. Therefore, if a self-diagnosis signal indicating a sign of abnormality of the rotary encoder is notified from the rotary encoder side to the control CPU of the electronic control device by communication or the like, and further the degree of the abnormality level can be notified to the electronic control device side by communication. Although it is desirable, there is a case where there is no margin in the communication port on the control CPU side.

The present invention has been made in view of the above, and it is an object of the present invention to provide an elevator apparatus capable of inputting a self-diagnosis signal indicating the state of a rotary encoder to a general-purpose port on the control CPU side of the electronic control apparatus.

An elevator apparatus according to the present invention includes a motor that drives a hoisting machine to raise and lower a car, and a control CPU that detects the rotation state of the rotating shaft of the motor and electronically controls the detection output of the motor. The rotary encoder includes a rotary encoder that outputs to the electronic control device, and the rotary encoder includes a self-diagnosis CPU that self-diagnose the state of the rotary encoder for each predetermined self-diagnosis item, and a self-diagnosis CPU. A fail-safe signal output unit that can be connected to the general-purpose port with a single signal line by outputting the self-diagnosis result from the control port to the general-purpose port of the control CPU as a fail-safe signal with variable duty It is characterized by this.

In the elevator apparatus of the present invention, even if there is no available communication port of the control CPU of the electronic control device, the duty is varied in accordance with the self-diagnosis result and the fail-safe signal output unit outputs the fail-safe signal as the fail-safe signal. In addition to being able to output to the general-purpose port of the control CPU and transmitting the self-diagnosis information to the electronic control device side, the fail-safe signal output unit and the control CPU of the electronic control device are connected by a single signal line Therefore, a simple and inexpensive configuration with only one signal line for transmitting a plurality of self-diagnosis information from the rotary encoder side to the electronic control unit is sufficient.

In the elevator apparatus of the present invention, a plurality of self-diagnosis information indicating the state of the rotary encoder with a simple and inexpensive configuration with only one signal line, even if there is no available communication port of the control CPU of the electronic control unit Can be transmitted to the control CPU side of the electronic control unit.

Hereinafter, an electronic control system for controlling an elevator apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings .

  Referring to FIG. 1, an elevator apparatus 1 drives a hoisting machine 3 by a driving motor 5 to raise and lower a car 9 via a rope 7, while a motor shaft of the driving motor 5 that is a detected shaft. The detection signal from the rotary encoder 11 attached to 10 (including the case through the speed reduction mechanism) is input to the electronic control unit 13. The electronic control device 13 incorporates a control CPU (not shown) in FIG. 1, and drives and controls the drive motor 5 based on a detection signal from the rotary encoder 11. There are various other control contents of the elevator apparatus 1 by the electronic control apparatus 13, but the description thereof is omitted. In the following description, for the sake of explanation, the description is applied to an incremental type rotary encoder. However, the present invention is not limited to an incremental type and can be similarly applied to an absolute type rotary encoder.

  Referring to FIG. 2, the incremental rotary encoder 11 includes an encoder housing 12 fixed to a mechanism (not shown), and is supported on the motor shaft 10 by a pair of bearings 14 in the axial direction.

  Referring to FIG. 3, the incremental rotary encoder 11 is capable of transmitting light from the light projecting element 15 at equal intervals in the circumferential direction between the light projecting element 15 and the light receiving elements 17 and 19. The rotating slit plate 21 having the rotating slit is opposed to the fixed slit plate 23 having a fixed slit capable of transmitting light from the light projecting element 15 on one side of the rotating slit plate 21 in the same manner as the rotating slit. It is arranged.

  The fixed slit of the fixed slit plate 23 sequentially shifts the light from the light projecting element 15 by 90 degrees in terms of electrical angle and passes through the rotary slit of the rotary slit plate 21 to form A-phase and B-phase optical signals. At the same time, the light receiving elements 17 and 19 receive the A-phase and B-phase optical signals shifted by 90 degrees in electrical angle, and convert the A-phase and B-phase optical signals into electrical signals as shown in FIG. It is supposed to be.

  Then, the rotary encoder 11 transmits the A-phase optical signal “0” and the B-phase optical signal “0” based on the number of the optical signals per unit time and the binary code of the A-phase and B-phase optical signals. “0” for the combination, “2” for the combination of the A phase optical signal “1”, “0” for the B phase optical signal “0”, “3” for the combination of the A phase optical signal “1” and the B phase optical signal “1”, The combination of the A phase optical signal “0” and the B phase optical signal “1” is set to “1”, and the rotation direction can be determined from the change order of the binary code.

  As shown in FIG. 5, in the rotary encoder 11, a light receiving element 17, 19 receives light emitted from the light projecting element 15 through the fixed slit plate 23 and the rotary slit plate 21 schematically shown in FIG. 5. The CPU 25 has a configuration and outputs both A and B phase signals from the light receiving elements 17 and 19 to the electronic control unit 13 while inputting both A and B phase signals to the AD conversion port A / D. The CPU 25 applies ON / OFF control to the light projecting element 15 by applying a PWM (pulse width modulation) control pulse to the base of the transistor 27 connected in series with the light projecting element 15 from the output port OUT. Then, by controlling the pulse width for turning on the light projecting element 15, the light projecting intensity of the light projecting element 15 (the amount of light projected per unit time) is controlled.

  The CPU 25 is shared with a self-diagnosis CPU described below. Of course, the CPU 25 may be a CPU different from the self-diagnosis CPU.

  With reference to FIG. 6, the block configuration of the electronic control system of the embodiment will be described. This electronic control system is controlled by the elevator apparatus 1 and includes a rotary encoder 11, an electronic control apparatus 13, and a drive motor 5. The electronic control device 13 includes a control CPU 39.

  The rotary encoder 11 includes an A / B phase signal output unit 31, a self-diagnosis data processing unit 33, the CPU (self-diagnosis CPU) 25, and a fail-safe signal output unit 35.

  The A and B phase signal output unit 31 outputs both the A and B phase signals shown in FIG. 4 to the electronic control unit 13. The electronic control device 13 detects the rotational speed and direction of the drive motor 5 from both the A and B phase signals and controls the drive motor 5 to control the lift position and the lift speed of the car 9. .

  The self-diagnosis data processing unit 33 includes a power supply voltage, a light amount of the light projecting element 15, an output signal of the light receiving elements 17 and 19, presence / absence of both A and B phase signals, a cycle thereof, a duty thereof, a pulse of both A and B phase signals. Process self-diagnostic items such as numbers. For example, as the power supply voltage, the power supply voltage monitored by a power supply voltage monitoring circuit (not shown) is input to the CPU 25 for self-diagnosis.

  The self-diagnosis CPU 25 classifies the power supply voltage from the power supply voltage monitoring data input from the self-diagnosis data processing unit 33 into a plurality of stages such as normal, serious abnormality (abnormal level is large), and minor abnormality (abnormal level is small). Then, a self-diagnosis signal composed of a pulse train having an on-duty corresponding to each stage is output to the fail-safe signal output unit 35.

 The fail-safe signal output unit 35 transmits a signal at each stage according to the self-diagnosis state as a fail-safe signal with a variable duty to a general-purpose port of the control CPU 39 of the electronic control unit 13 through a single signal line 36. To do.

  The control CPU 39 of the electronic control unit 13 can read the on-duty of the fail-safe signal input to the general-purpose port and determine the state of the rotary encoder 11. According to this determination, the control motor 39 and other control objects are determined. Electronically controlled.

  In the embodiment described above, when the self-diagnosis CPU 25 performs the self-diagnosis result performed while the elevator car 9 is moving up and down, for example, as a result that the light quantity of the light projecting element has deteriorated, the rotary encoder 11 From the fail safe signal output unit 35, a fail safe signal of on-duty information indicating the progress of the deterioration is input to the control CPU 39 of the electronic control unit 13. Then, the control CPU 39 cuts off the power supply to the drive motor 5 when the light quantity of the light projecting element 15 is an abnormal level “high”, that is, a serious abnormality with a large degree of deterioration, based on the on-duty information included in the fail-safe signal. Further, in the case of a minor abnormality in which the light amount of the light projecting element 15 is a deterioration level of an abnormal level “medium”, the power supply to the driving motor 5 is not interrupted, and the car 9 is raised and lowered to the nearest floor on the way. Then, after the stop control is performed, the elevator door is controlled to the open side, and an alarm is controlled and a control is given to the elevator apparatus management center. As a result, workers and the like can take maintenance and other measures appropriately and promptly.

  In this case, the self-diagnosis CPU ignores both the A and B phase signals from the rotary encoder, for example, if the rotary encoder is in a serious abnormal state such as a light emitting element light amount of zero, and the motor rotation speed is safe. The driver can continue to drive the vehicle if there is a slight abnormality in the duty of both the A and B phase signals, although the light intensity of the light projecting element is not zero. This can be promptly notified and prompt the driver to promptly check or repair the vehicle.

  From the above, in the present embodiment, even if the communication port of the control CPU 39 of the electronic control unit 13 is not empty, the duty is varied in accordance with the self-diagnosis result and the fail-safe signal output unit 35 1 as a fail-safe signal. The signal can be transmitted to the control CPU 39 via the signal line 36.

  Further, in the present embodiment, the fail safe signal output unit 35 and the control CPU 39 can be connected by a single signal line 36, so that a plurality of self-diagnosis information is transmitted from the rotary encoder 11 side to the electronic control unit 13. A simple and inexpensive configuration is sufficient.

FIG. 1 is a diagram showing a schematic configuration of an electronic control system according to an embodiment of the present invention. FIG. 2 is a view showing a state in which the rotary encoder is supported on the motor shaft by a bearing. FIG. 3 is a diagram showing a schematic mechanical configuration of the incremental rotary encoder. FIG. 4 is a diagram showing the relationship between the A phase and the B phase by the incremental rotary encoder. FIG. 5 is a diagram showing a schematic electrical configuration of the rotary encoder. FIG. 6 is a diagram showing a schematic block configuration of the electronic control system according to the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elevator apparatus 5 Drive motor 11 Rotary encoder 25 Self-diagnosis CPU
31 A- and B-phase signal output unit 33 Self-diagnosis data processing unit 35 Fail-safe signal output unit 13 Electronic control unit 39 CPU for control

Claims (1)

A motor that drives the hoisting machine to raise and lower the car, and detects the rotation state of the rotating shaft of the motor, and outputs the detection output to an electronic control device that includes a control CPU that electronically controls the motor. An elevator device including a rotary encoder,
The rotary encoder includes a self-diagnosis CPU that self-diagnoses the state of the rotary encoder for each predetermined self-diagnosis item, and a self-diagnosis result from the self-diagnosis CPU as a variable duty fail-safe signal. An elevator apparatus including a fail-safe signal output unit that can be connected to the general-purpose port by a single signal line by outputting to a port.

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