JP2007082277A - Monitoring apparatus of electric drive machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring apparatus 21 for reducing a restriction on an installation of a sensor section 23 and easily installing the sensor section 23. <P>SOLUTION: The sensor section 23 is disposed outside a motor, and provided with a magnetoelectric converting element 35 for detecting a magnetic flux generated during an operation of the motor and outputting an electrical signal. A rotation determining section 43 is provided, and determines the operation of the motor based on the electrical signal outputted from the sensor section 23. An accumulation section 44 is provided, and accumulates the number of activations and operation durations in the motor based on a determination by the rotation determining section 43. A display section 27 is provided, and displays the operation duration accumulated by the accumulation section 44. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a monitoring device for an electric drive machine that cumulatively displays the number of activations of the electric drive machine.

  Conventionally, for example, in a conveyor, a roller or a belt is driven by rotation of a motor to convey a conveyed product. By grasping the number of times the motor is activated, the life of the belt, the maintenance time of the conveyor, and troubles are detected. It becomes possible to grasp the time of occurrence.

In order to grasp the number of start times of the motor, a voltage detection method that directly detects the voltage applied to the motor and integrates it as the number of start times, inputs an open / close signal of the contact point of the switching device that operates the motor, and integrates it as the number of start times Contact opening / closing detection method (for example, refer to Patent Document 1), current energization detection in which a current sensor is attached so as to sandwich the periphery of an electric wire that passes a drive current to the motor, and the energization of the motor is detected and integrated as the number of activations (For example, refer to Patent Document 2). And there exists a monitoring apparatus which integrates and displays the number of start-ups of a motor using these detection methods.
JP 2004-15874 A (page 4, FIG. 2) JP 2002-365511 A (page 4, FIG. 1, FIG. 4)

  However, in the case of a monitoring device using a voltage detection method or a setting open / close detection method, wiring to the electric circuit of the motor is required, and expertise is required for wiring, and the wiring place is limited or insulation processing is required. There is a problem that cannot be installed easily.

  In addition, in the case of a monitoring device using the current conduction detection method, the analysis range of the current sensor is limited, so it is necessary to change the current sensor and the device body depending on the current value, and the size of the current sensor is also limited. There is a problem that the installation may be restricted, for example, depending on the diameter of the electric wire to which the current sensor is attached, cannot be normally attached.

  The present invention has been made in view of the above points, and an object thereof is to provide a monitoring device for an electric drive machine in which there are few restrictions on the installation of the sensor unit and the sensor unit can be easily installed.

  The monitoring device for an electric drive machine according to claim 1, wherein the sensor unit is disposed outside the electric drive machine, and includes a magnetoelectric conversion element that detects a magnetic flux generated during operation of the electric drive machine and outputs an electric signal; An operation determination unit that determines the operation of the electric drive machine based on the electric signal output from the sensor unit, an integration unit that integrates the number of times the electric drive machine is started based on the determination of the operation determination unit, and the integration unit And a display unit for displaying the number of activations accumulated in step (b).

  The monitoring device for an electric drive machine according to claim 2, wherein the sensor unit is disposed outside the electric drive machine, and includes a magnetoelectric conversion element that detects a magnetic flux generated during operation of the electric drive machine and outputs an electric signal; An operation determination unit that determines the operation of the electric drive machine based on the electric signal output from the sensor unit, an integration unit that integrates the number of activations and the operation time of the electric drive machine based on the determination of the operation determination unit, And a display unit for displaying the number of activations and the operation time accumulated by the accumulation unit.

  The monitoring device for the electric drive machine according to claim 3 is the monitoring device for the electric drive machine according to claim 1 or 2, wherein the sensor unit includes a binding means for binding the sensor unit to the outside of the electric drive machine. is there.

  According to the monitoring device for an electric drive machine according to claim 1, a sensor unit having a magnetoelectric conversion element that detects a magnetic flux generated during operation of the electric drive machine and outputs an electric signal is used, and the sensor unit is electrically driven. Since the number of activations of the electric drive machine can be integrated and displayed simply by disposing it outside the machine, there are few restrictions on the installation of the sensor unit, and the sensor unit can be installed easily.

  According to the monitoring device for an electric drive machine according to claim 2, a sensor unit having a magnetoelectric conversion element that detects a magnetic flux generated during operation of the electric drive machine and outputs an electric signal is used, and the sensor unit is electrically driven. Since the number of activations and the operating time of the electric drive machine can be integrated and displayed simply by arranging them outside the machine, there are few restrictions on the installation of the sensor unit, and the sensor unit can be installed easily.

  According to the monitoring device for the electric drive machine according to claim 3, in addition to the effect of the monitoring device for the electric drive machine according to claim 1 or 2, the sensor unit is attached to the outside of the electric drive machine by the binding means of the sensor unit. Easy to install.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 4, a motor 11 that is an electric drive machine and is a rotary electric machine includes a stator 12 and a rotor 13 that is rotatably disposed in the stator 12. The rotor 13 is rotated by energizing the stator windings. FIG. 4 shows an instantaneous state of the magnetic flux 14 generated in the motor 11 when the motor 11 is in operation.

  As shown in FIG. 2, the monitoring device 21 includes a device main body 22, a sensor unit 23 attached to a position where the magnetic flux (leakage magnetic flux) 14 generated when the motor 11 is operated outside the motor 11 can be detected. A sensor cord 24 for connecting the apparatus main body 22 and the sensor unit 23 is provided.

  The apparatus main body 22 has a main body case 26. On the front surface of the main body case 26, a display unit 27 such as a liquid crystal display that digitally displays the number of activations and the operation time is provided. A switch 28 for switching display contents on the unit 27 is provided. The display unit 27 has a function of automatically turning off after displaying for a certain time.

  In the main body case 26, a control unit 29 that displays the number of activations and operating time on the display unit 27 based on the output of the sensor unit 23, a battery 30 that supplies power to the control unit 29, the display unit 27, and the like Is housed. As the battery 30, a battery having a life and capacity that can sufficiently cover the life of the motor 11 is used.

  At the upper part of the main body case 26, a hook portion 32 having a hooking hole 31 for hooking and installing the apparatus main body 22 is projected.

  As shown in FIG. 3, the sensor unit 23 has a sensor case 34 made of, for example, resin, and detects the magnetic flux 14 generated during operation of the motor 11 and outputs an electric signal in the sensor case 34. A magnetoelectric transducer 35 is accommodated. A tie band attaching hole 36 is formed in the sensor case 34 so as to penetrate both sides of the sensor case 34, and a tie band 37 as a binding means is detachably attached to the tie band attaching hole 36. The binding band 37 is a general-purpose product, and has a band portion 38. An insertion portion 39 is formed at one end of the band portion 38, and an insertion hole 40a into which the insertion portion 39 is inserted at the other end. A locking portion 40 is provided for locking the insertion portion 39 inserted into the insertion hole 40a at the insertion position.

  FIG. 1 is a block diagram of the monitoring device, and an electrical signal output from the magnetoelectric transducer 35 of the sensor unit 23 is input to the control unit 29. In the control unit 29, the electric signal input from the magnetoelectric conversion element 35 is amplified and shaped by the amplifier waveform shaping unit 42, and the motor 11 is rotated by the rotation determination unit 43 as an operation determination unit based on this signal. The integrating unit 44 accumulates the number of activations when the motor 11 is activated and the operation time while the motor 11 is rotating. The display unit 27 displays the number of activations and the operating time accumulated by the integrating unit 44 of the control unit 29.

  Next, the operation of the present embodiment will be described.

  For example, when the monitoring device 21 is applied to a conveyor, the sensor unit 23 is mounted at a position where the magnetic flux (leakage magnetic flux) 14 can be detected outside the motor 11 of the conveyor, and the device body 22 is installed on the outer surface of the conveyor frame. It is mounted in a place where the display unit 27 of the main body 22 is easily visible and the switch 28 is easy to operate.

  When the sensor unit 23 is mounted on the conveyor motor 11, the sensor unit 23 is placed in contact with the outer peripheral surface of the motor 11, and the band portion 38 of the binding band 37 is wound around the outer peripheral surface of the motor 11, while the binding band 37 The insertion part 39 is inserted into the locking part 40, and the outer peripheral surface of the motor 11 is tightened and locked by the binding band 37. At this time, if the length of the binding band 37 does not match the outer diameter of the motor 11, it can be replaced with a binding band 37 having a length corresponding to the outer diameter of the motor 11.

  When the motor 11 is energized during the operation of the conveyor, the rotor 13 is rotated with respect to the stator 12, and a driving force for conveying the conveyed product by the conveyor is generated.

  As shown in FIG. 4, when the motor 11 is energized, a magnetic flux 14 that passes through the stator 12 and the rotor 13 is generated in the motor 11, and this magnetic flux 14 is centered on the rotor 13 as the rotor 13 rotates. Rotate.

  A magnetic flux 14 that rotates with the rotation of the rotor 13 acts on the magnetoelectric transducer 35, and a sine wave electrical signal is induced in the magnetoelectric transducer 35 as shown in FIG. To the control unit 29.

  The control unit 29 of the apparatus main body 22 amplifies the electric signal input from the magnetoelectric transducer 35 by the amplifier waveform shaping unit 42 and shapes the waveform. Based on this signal, the motor 11 is rotated by the rotation determination unit 43. Whether or not the motor 11 is started and the operating time while the motor 11 is rotating are integrated by the integrating unit 44. Then, the operating time accumulated by the accumulation unit 44 of the control unit 29 is displayed on the display unit 27.

  Since the operation time of the motor 11 can be grasped by the monitoring device 21, it is possible to grasp the number of times the conveyor is started and the operation time, and to grasp the maintenance time of the conveyor, the trouble occurrence time, and the like.

  As described above, the monitoring device 21 uses the sensor unit 23 having the magnetoelectric conversion element 35 that detects the magnetic flux 14 generated during the operation of the motor 11 and outputs an electric signal, and this sensor unit 23 is placed outside the motor 11. Since the number of activations and the operation time of the motor 11 can be integrated and displayed simply by arranging them, there are few restrictions on the installation of the sensor unit 23, and the sensor unit 23 can be installed easily. That is, there is no need for wiring to the electric circuit of the motor 11 as in the conventional voltage detection method and contact open / close detection method, so no specialized knowledge is required, there is no need to limit the wiring location and insulation processing, Unlike the current energization detection method, there is no need to change the current sensor or the device main body depending on the capacity of the motor 11, and there is no restriction on the mounting of the current sensor due to the diameter of the electric wire. Then, there are few restrictions with respect to installation of the sensor part 23, and the sensor part 23 can be installed easily.

  Further, since the binding band 37 is used, the sensor unit 23 can be easily attached to and detached from the motor 11 without requiring a tool or the like.

  The electric drive machine to which the monitoring device 21 is applied is not limited to the motor 11 and can be similarly applied to an electric drive machine that generates magnetic flux when the solenoid or the like is operated, for example.

  The monitoring device 21 is not limited to a conveyor, and can be applied to various devices using an electric drive machine as a drive source.

It is a block diagram of a monitoring device showing an embodiment of the present invention. It is a perspective view of a monitoring apparatus same as the above. It is a perspective view of the sensor part of a monitoring apparatus same as the above. It is explanatory drawing which shows the relationship between the sensor part of a monitoring apparatus same as the above, and the magnetic flux which generate | occur | produces at the time of operation | movement of an electric drive machine. It is a wave form diagram of the electric signal output from the sensor part of a monitoring apparatus same as the above.

Explanation of symbols

11 Motors as electric drive machines
21 Monitoring device
23 Sensor section
27 Display
35 Magnetoelectric transducer
37 Binding band as a binding means
43 Rotation judgment part as operation judgment part
44 Integration unit

Claims (3)

A sensor unit that is arranged outside the electric drive machine and has a magnetoelectric transducer that detects magnetic flux generated during operation of the electric drive machine and outputs an electric signal;
An operation determination unit for determining the operation of the electric drive machine based on the electric signal output from the sensor unit;
An accumulator that integrates the number of times the electric drive machine is started based on the determination of the operation determination unit;
An electric drive machine monitoring device, comprising: a display unit configured to display the number of times of activation accumulated by the accumulation unit. A sensor unit that is disposed outside the electric drive machine and has a magnetoelectric transducer that detects magnetic flux generated during operation of the electric drive machine and outputs an electric signal;
An operation determination unit for determining the operation of the electric drive machine based on the electric signal output from the sensor unit;
Based on the determination of the operation determination unit, an integration unit that integrates the number of activations and the operation time of the electric drive machine,
A monitoring device for an electrically driven machine, comprising: a display unit that displays the number of activations and the operation time accumulated by the accumulation unit. The monitoring device for an electric drive machine according to claim 1 or 2, wherein the sensor unit includes binding means for binding the sensor unit to the outside of the electric drive machine.

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