JP6668034B2 - Motor drive control device and level crossing circuit breaker - Google Patents

Description

  The present invention relates to a motor drive control device and a level crossing breaker provided with the motor drive control device.

  A railroad crossing is equipped with a railroad crossing breaker to cut off traffic on a railroad crossing when a train passes. This railroad crossing breaker is configured such that when an abnormality such as a power failure or a failure occurs, the breaking rod is lowered by its own weight to ensure safety. As a technique for lowering the self-weight of the blocking rod, for example, a technique of adjusting the self-weight lowering characteristic for the purpose of avoiding the danger of traffic is known (see Patent Document 1). The technique of Patent Document 1 focuses on the fact that the speed increases as the breaking rod descends by its own weight, and is configured so that when the breaking rod descends to a predetermined angle, the motor that drives the breaking rod is subjected to dynamic braking. ing.

JP-A-11-291911

  However, in the technique of Patent Document 1, the phenomenon that the descending speed of the cut-off rod is increased and the power-supply braking is applied, the descending speed is reduced, the power-supply braking is released, and the descending speed is increased again is repeated. An event could occur in which the rod was jerking and descending.

  SUMMARY OF THE INVENTION It is an object of the present invention to lower a breaking rod at a raised position at a constant speed by its own weight when an abnormality such as a power failure or a failure occurs.

A first invention for solving the above problems is
A speed reduction mechanism (for example, the motor output shaft 331, the cut-off rod shaft 3, and the rotation transmission mechanism 20 in FIG. 1) including a plurality of shafts having a motor output shaft as a high-speed shaft and a cut-off rod shaft as a low-speed shaft; A brushless motor (for example, the brushless motor 30 in FIG. 1) that rotates the motor output shaft to move the breaking rod up and down, and that the driving of the brushless motor is stopped and the breaking rod moves to a predetermined rising position or a predetermined position. A non-contact type electromagnetic brake (e.g., the electromagnetic brake shown in FIG. 1) that is operated when it is located at the lowered position to brake the rotation of the motor output shaft or another high-speed shaft (hereinafter collectively referred to as "braking high-speed shaft"). A brake drive having a brake 50), wherein a drive voltage is applied to the brushless motor to move the breaking rod up and down.
A waveform signal of a periodic excitation voltage generated in the electromagnetic brake by the rotation of the high-speed braking shaft when the breaking rod, which has been in the ascending position at the time of the abnormality, descends under its own weight (hereinafter abbreviated as “at the time of its own weight descending”). A dynamic brake control circuit unit (for example, a D brake control circuit unit 66 in FIG. 1) that suppresses the rotation speed of the brushless motor to a constant speed based on
It is a motor drive control device provided with.

The second invention is
The dynamic brake control circuit unit is configured to be operable using excitation power generated in the electromagnetic brake by rotation of the high-speed braking shaft when the self-weight is lowered, as a power supply.
1 is a motor drive control device according to a first invention.

The third invention is
A speed reduction mechanism (for example, the motor output shaft 331, the cut-off rod shaft 3, and the rotation transmission mechanism 20 in FIG. 1) including a plurality of shafts having a motor output shaft as a high-speed shaft and a cut-off rod shaft as a low-speed shaft; ,
A brushless motor (e.g., the brushless motor 30 in FIG. 1) that rotates the motor output shaft to move the breaking rod up and down,
A non-contact type electromagnetic brake that operates when the drive of the brushless motor is stopped and the breaking rod is positioned at a predetermined raised position or a predetermined lowered position to brake the rotation of the high-speed braking shaft (for example, FIG. 1) an electromagnetic brake 50);
A motor drive control device according to the first or second invention (for example, the motor driver 60 in FIG. 1);
It is a level crossing breaker equipped with.

  According to the first or third aspect, under normal conditions, a drive voltage is applied to the brushless motor during the elevating operation of the cut-off rod, and the motor output shaft rotates. Further, when the elevating operation is stopped, the non-contact type electromagnetic brake is operated, and the rotation of the high-speed shaft for braking is braked, so that the elevating operation of the breaking rod is stopped and held.

  Then, when an abnormality such as a power failure or a failure occurs when the breaking rod is in the raised position, the breaking rod falls by its own weight. At this time, according to the first or third invention, the braking rotary shaft is lowered by its own weight. Is rotated to generate a periodic excitation voltage signal in the electromagnetic brake. Based on this signal, a dynamic brake is applied to the brushless motor to control the rotation speed to be constant. Therefore, when an abnormality such as a power failure or a failure occurs, the weight of the breaking rod at the ascending position can be lowered at a constant speed.

  According to the second aspect, the dynamic brake control circuit can be operated with the excitation power generated in the electromagnetic brake due to the self-weight drop of the breaking rod at the time of abnormality.

The figure which shows the control block example of the railroad crossing breaker to which the electric power and the flow of the signal at the time of normal operation were attached. The figure which shows the control block example of the railroad crossing breaker to which the electric power and the flow of the signal at the time of a power failure were added. FIG. 2 is a schematic diagram illustrating a configuration example of a brushless motor. FIG. 2 is a schematic diagram illustrating a configuration example of an electromagnetic brake. FIG. 4 is a diagram illustrating a signal processing process of a brake excitation waveform conversion unit. The figure which shows the example of the brake system of the brushless motor at the time of the self-weight fall of a blocking rod. The figure which shows the modification of the example of a control block of a railroad crossing breaker.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited by the embodiments described below, and the form to which the present invention can be applied is not limited to the following embodiments. In the description of the drawings, the same portions are denoted by the same reference numerals.

  1 and 2 are diagrams showing an example of a control block of the level crossing breaker 100 according to the present embodiment. In FIG. 1, the power during the normal operation of the level crossing breaker 100 and the elevating operation of the crossing rod 1 is shown. FIG. 2 shows the flow of power and signals when the weight of the breaking rod 1 is lowered due to the occurrence of a power failure. The flow is indicated by solid arrows, and the broken line in FIG. 2 indicates that no power or signal is flowing. The components of the motor driver 60 indicated by hatching in FIGS. 1 and 2 are not operating in the operation states corresponding to FIGS. 1 and 2 (normal operation in FIG. 1 and power failure in FIG. 2). Is shown.

  The level crossing circuit breaker 100 according to the present embodiment operates by inputting a power supply unit 10, a three-phase brushless motor 30 that rotates a motor output shaft 331 to move the breaking rod 1 up and down, and a DC brake operation signal. Then, a non-contact type electromagnetic brake 50 for holding the breaking rod 1 at a predetermined raised position (vertical state) or a predetermined lowered position (horizontal state), and a motor drive control device for controlling the driving of the brushless motor 30 And a circuit breaker circuit 70 for performing a control input for raising or lowering the breaking rod 1.

  The rotation of the motor output shaft 331 is transmitted to the support shaft (cutoff rod shaft) 3 of the cutoff rod 1 via the rotation transmission mechanism 20. Specifically, the rotation transmission mechanism 20 constitutes a speed reduction mechanism having a plurality of gears and the like, and includes at least a motor output shaft 331 as a high-speed shaft and a cut-off rod shaft 3 as a low-speed shaft. The rotation speed of the motor output shaft 331 is reduced and transmitted by the speed reduction mechanism, and the cut-off rod shaft 3 is rotated. Thereby, the cut-off rod 1 is lowered or raised in accordance with the rotation direction of the brushless motor 30. In addition, when the cutoff rod 1 at the raised position falls under its own weight when there is an abnormality such as a power failure, the rotational force of the cutoff rod shaft 3 is transmitted to the motor output shaft 331 by the reduction mechanism to rotate the motor output shaft 331. Let it. When the self-weight falls, regenerative power is generated in the brushless motor 30 and power is supplied to the power supply unit 10 via the motor drive unit 61. However, if the regenerative power does not reach a certain level, the motor driver 60 cannot be started. .

  In addition, one of the high-speed shafts included in the speed reduction mechanism of the rotation transmission mechanism 20 is an axis to be braked by the electromagnetic brake 50 (high-speed axis for braking). When the high-speed braking shaft is braked by the electromagnetic brake 50, the rotation transmission of the transmission mechanism is stopped, so that the rotation of the motor output shaft 331 and the rotation of the cut-off rod shaft 3 by the brushless motor 30 are also stopped, and the locked state is established. . Here, the high-speed shaft refers to a shaft that rotates at a high speed with respect to the rotation of the cut-off rod shaft 3. In this embodiment, the high-speed braking shaft of the electromagnetic brake 50 and the motor output shaft 331 are coaxial. That is, the braking high-speed shaft is the motor output shaft 331. The braking high-speed shaft may be a high-speed shaft, and may be a high-speed shaft different from the motor output shaft 331.

  The power supply unit 10 supplies drive power to the brushless motor 30 via a motor driver 60 from an external power supply (not shown) under the control of the circuit breaker circuit 70. In addition, an operation power supply (a thick arrow in FIG. 1) for operating the entire circuit of the motor driver 60 is supplied. Accordingly, the motor driver 60 is activated, and controls the drive of the brushless motor 30 based on a command for raising or lowering the cut-off rod shaft 3 from the circuit breaker circuit 70.

  The brushless motor 30 is, for example, a three-phase drive motor having an inner rotor type structure, and an example of the structure is schematically shown in FIG. The rotor 33 includes four-pole permanent magnets 333 in which N-pole permanent magnets and S-pole permanent magnets are alternately arranged in the circumferential direction of a motor output shaft 331 that is a rotating shaft. Rotate as center. On the other hand, the stator 31 has three slots defined at equal angular intervals of 120 °, and three-phase (U-phase, V-phase, W-phase) coils 311, 313, disposed in each slot. 315. The coils 311, 313 and 315 of each phase are mutually connected at a neutral point.

  The electromagnetic brake 50 is a rotating electric machine similar in structure to the brushless motor 30, and an example of the structure is schematically shown in FIG. In the electromagnetic brake 50, the rotor 53 is integrally formed with a rotation shaft 531 coaxial with the motor output shaft 331, and a four-pole permanent magnet 533 is configured to rotate with the rotation shaft 531. On the other hand, the stator 51 is provided with coils (electromagnet coils) 511 and 513 disposed in two phases of three-phase (U-phase, V-phase and W-phase) slots, and the coils 511 and 513 are connected in series. It is composed.

  When the electromagnetic brake 50 is operated, the coils 511 and 513 are energized by the input of the brake operation signal (DC) from the circuit breaker circuit 70, so that a braking force is generated between the stator 51 and the rotor 53, The rotation of the motor output shaft 331 is braked in a non-contact manner. On the other hand, when the electromagnetic brake 50 is released (OFF), the rotor 53 rotates with the rotation of the motor output shaft 331, so that an excitation voltage is generated in the electromagnetic brake 50. That is, the excitation voltage signal of the electromagnetic brake 50 can be said to be a signal corresponding to the rotation of the motor output shaft 331. However, since the generated excitation voltage itself is an AC signal having a large amplitude, in the present embodiment, the signal is subjected to various signal processing and then used for drive control of the brushless motor 30. First, the generated excitation voltage signal (AC) is output to the step-down circuit unit 651 of the brake excitation waveform conversion unit 65 included in the motor driver 60.

  The configuration of the poles, phases, and slots of the brushless motor 30 is not limited to the configuration illustrated in FIG. Similarly, the electromagnetic brake 50 is not limited to the pole / phase / slot configuration illustrated in FIG. Both the brushless motor 30 and the electromagnetic brake 50 may be configured by appropriately selecting the number of poles, the number of phases, and the number of slots.

  Returning to FIGS. 1 and 2, the motor driver 60 includes a motor driving unit 61 that drives the brushless motor 30, a motor control unit 63 that controls the motor driving unit 61, and an excitation voltage waveform generated in the electromagnetic brake 50 during the elevating operation. A brake excitation waveform converter 65 for detecting a change cycle of the excitation voltage, a D brake control circuit 66 for applying a dynamic brake (hereinafter abbreviated as “D brake”) to the brushless motor 30 based on the change cycle of the excitation voltage waveform, A rotation angle detection unit 67 that detects the rotation angle (control rotation angle) of the brushless motor 30 based on the change period of the waveform.

  The motor drive unit 61 has a so-called inverter circuit configured using an FET (Field Effect Transistor) or the like. During normal operation, the power supplied from the power supply unit 10 is converted into three-phase AC power according to the control signal of the motor control unit 63 and supplied to the brushless motor 30. Further, when the breaking rod 1 descends under its own weight in the event of an abnormality, the brushless motor 30 generates regenerative electric power. The regenerative electric power is output to the power supply unit 10 by performing a conversion operation in the direction opposite to the inverter operation. Note that while the regenerative electric power is less than the constant electric power, the electric power is not enough to start the motor driver 60. Therefore, in FIG. 2, an arrow from the motor drive unit 61 to the power supply unit 10 is indicated by a broken line, and a thick arrow from the power supply unit 10 to the motor driver 60 is indicated by a white broken line.

  The motor control unit 63 drives the brushless motor 30 in the ascending direction or the descending direction of the breaking rod 1 in response to an ascending command or a descending command from the breaking circuit 70, and moves the breaking rod 1 up and down. At that time, the motor control unit 63 controls the drive of the brushless motor 30 using the control rotation angle of the brushless motor 30 which is detected by the rotation angle detection unit 67 as needed, and the cutting rod 1 during the ascent operation. Has reached the ascending reference position, and when the descent operation is being performed, the drive of the brushless motor 30 is stopped by detecting that the breaking rod 1 has reached the ascending reference position. For example, the motor control unit 63 controls the rotation speed of the brushless motor 30 using the detected control rotation angle. In addition, using the control rotation angle, the number of rotations of the brushless motor 30 from the start of the elevating operation is counted or the like, and it is detected that the brushless motor 30 has reached the ascending reference position / descending reference position. Since the number of rotations of the brushless motor 30 from the start of the raising / lowering operation to the reaching of the raising reference position / lowering reference position is known, it can be set in advance.

  Further, the motor control unit 63 outputs a control signal to the D brake control circuit unit 66 to control whether the D brake control circuit unit 66 is operated or stopped. This control signal is a signal of H level or L level, and becomes a signal for stopping the D brake control circuit section 66 when it is at H level (hereinafter referred to as “operation stop signal”). That is, an operation stop signal is output during normal operation, and an instruction signal (hereinafter, referred to as an “operation permission signal”) for operating the D brake control circuit 66 when the signal level becomes L level due to a power failure or a failure is output. The Rukoto.

The brake excitation waveform conversion unit 65 includes a step-down circuit unit 651, a rectification circuit unit 653, and a voltage detection unit 655.
The step-down circuit unit 651 steps down the excitation voltage signal input from the electromagnetic brake 50 during the raising / lowering operation of the blocking rod 1 or at the time of its own weight lowering, and outputs it to the rectifier circuit unit 653. Further, it outputs the stepped-down excitation voltage signal as a power source of the D brake control circuit unit 66.

  The rectification circuit unit 653 performs full-wave rectification on the input voltage signal from the step-down circuit unit 651 and outputs the signal to the voltage detection unit 655. The voltage detection unit 655 generates a pulse signal described below from the input voltage signal from the rectification circuit unit 653 and outputs the pulse signal to the D-brake control circuit unit 66, while generating a logic signal described below and outputs the logic signal to the rotation angle detection unit 67. I do. The pulse signal output from the voltage detection unit 655 to the D brake control circuit unit 66 is used for D brake control of the brushless motor 30 when its own weight is lowered, and the logic signal output to the rotation angle detection unit 67 is the brushless motor during normal operation. 30 is used for drive control.

  FIG. 5A shows a schematic example of the excitation voltage waveform. Also, the excitation voltage signal having the excitation voltage waveform shown in (a) is stepped down by the step-down circuit unit 651, and the voltage waveform rectified by the rectification circuit unit 653 is (b), and the pulse signal generated by the voltage detection unit 655 is ( The logic signal generated by the voltage detector 655 is shown in (c).

  Since the rotor 53 of the electromagnetic brake 50 rotates with the rotation of the motor output shaft 331, the excitation voltage generated when the electromagnetic brake 50 is released (OFF) and the motor output shaft 331 starts to rotate is shown in FIG. As shown in a), it changes periodically according to the rotation of the electromagnetic brake 50. Therefore, the excitation voltage waveform is stepped down and rectified as shown in FIG. 5B, and a pulse signal as shown in FIG. 5C is generated to detect the rotation cycle of the electromagnetic brake 50, that is, the rotation cycle of the brushless motor 30. it can. The pulse signal of (c) is generated by detecting the rise of the voltage waveform of (b) and generating a pulse wave of a predetermined time width. Further, the logic signal of (d) is generated by converting the voltage waveform of (b) into a binary logic signal at a predetermined threshold Dth.

  Returning to FIGS. 1 and 2, the D brake control circuit unit 66 controls the motor drive unit 61 using the rotation cycle of the brushless motor 30 obtained from the change cycle of the excitation voltage waveform, so that the brushless motor 30 This is a circuit unit for executing dynamic brake control for suppressing the rotation speed of the vehicle to a constant speed. During normal operation, an operation stop signal is input from the motor control unit 63, so that the D brake control circuit unit 66 stops operation (shown by hatching in FIG. 1). Since the permission signal is input, the apparatus is started (FIG. 2).

  Further, the D brake control circuit unit 66 can operate with lower power than the operating power of the motor driver 60, and can operate with the excitation power input from the step-down circuit unit 651 when the weight of the breaking rod 1 drops. The D brake control circuit section 66 includes a constant voltage circuit 661 for converting the excitation voltage waveform input from the step-down circuit section 651 into a constant voltage power supply.

  The operation of the D brake control circuit unit 66 is a control operation of outputting a pulse signal input from the voltage detection unit 655 to the motor driving unit 61 as a D brake control signal and applying a D brake to the brushless motor 30. More specifically, the circuit operation (switching operation) of the motor drive unit 61 is controlled to apply a dynamic brake to the brushless motor 30 during the regenerative operation. Thus, a braking force proportional to the rotation speed is generated in the brushless motor 30, and the rotation speed of the brushless motor 30 is suppressed to be constant. In addition, it is preferable to set a duty ratio and a control parameter of a D brake for generating a braking force in advance so that the falling time required for the weight of the breaking rod 1 to fall by its own weight becomes a desired time and a target rotation speed. .

  Returning to the description of FIG. 5, in the present embodiment, in the electromagnetic brake 50, the permanent magnet 533 of the rotor 53 has four poles and the stator 51 has two phases and two slots. This indicates that the rotation shaft 531 (the motor output shaft 331 in the present embodiment) makes a half rotation in one change cycle. Therefore, in the drive control of the brushless motor 30 during the normal operation, the excitation voltage waveform is stepped down and rectified as shown in FIG. 5B, and then the binary voltage is applied as shown in FIG. , The rotation of the rotation shaft 531 can be detected in units of 180 °, and the rotation angle of the rotation shaft 531, that is, the rotation angle of the motor output shaft 331 can be known from the change period.

  The motor output shaft 331 (and the rotating shaft 531 that is the braking target shaft) is a high-speed shaft and has a sufficiently higher rotation ratio (for example, 10 times or more) as compared with the cut-off rod shaft 3 that is a low-speed shaft. Therefore, even if an error occurs in the rotation angle of the motor output shaft 331 determined from the change period of the excitation voltage waveform, the vertical position of the cut-off rod 1 does not greatly shift, and does not pose a problem in control.

  The configuration of the poles, phases, and slots differs between the brushless motor 30 and the electromagnetic brake 50. Therefore, the rotation angle detector 67 operating during normal operation uses the relationship between the pole / phase / slot configuration of the brushless motor 30 and the pole / phase / slot configuration of the electromagnetic brake 50 to change the excitation voltage waveform change cycle. Is converted into a change cycle according to the configuration of the poles, phases, and slots of the brushless motor 30, and the rotation angle of the brushless motor 30 is detected as the control rotation angle.

  Next, the operation of the crossing breaker 100 will be described. First, the operation of the level crossing circuit breaker 100 at the time of abnormality will be described by taking a power outage as an example. When the cut-off rod 1 is in the raised position at the time of the power failure, the electromagnetic brake 50 that has been operated to hold the cut-off rod 1 in the raised position is released as shown in FIG. 2 (from the circuit breaker circuit 70 to the electromagnetic brake 50). Since the drive power is turned off, the cut-off rod 1 starts to descend by its own weight. Further, since the power supply to the motor driver 60 is stopped due to the power failure, the motor control unit 63 stops the circuit operation, and the signal to the D brake control circuit unit 66 becomes the operation permission signal (L level signal). Become.

  When the breaking rod 1 starts to descend its own weight, the brake excitation waveform conversion unit 65 lowers the excitation voltage generated in the electromagnetic brake 50 and starts supplying the power of the D brake control circuit unit 66 to the D brake control circuit unit 66. Then, the D brake control circuit unit 66 to which the operation permission signal has been input starts the circuit operation.

  During its own weight descent, the brake excitation waveform conversion unit 65 detects a change cycle of the excitation voltage waveform generated in the electromagnetic brake 50 as needed, and outputs a pulse signal synchronized with the rotation cycle of the brushless motor 30 to the D brake control circuit unit 66. . Therefore, the D brake control circuit unit 66 outputs the input pulse signal as a D brake control signal to the motor drive unit 61 to apply a dynamic brake to the brushless motor 30. Thus, the rotation speed of the brushless motor 30 is suppressed to a constant speed, and the breaking rod 1 descends at its own weight.

  Next, during normal operation, when a notification that the train has approached the railroad crossing at the installation location is received from the outside at the level crossing breaker 100, the power supply unit is controlled under the control of the breaker circuit 70 as shown in FIG. 10 supplies the motor power to start (ON) the motor driver 60 and output a lowering command for instructing the lowering operation of the blocking rod 1. Further, the electromagnetic brake 50 is released (OFF). Then, in the motor driver 60, the motor control unit 63 drives the brushless motor 30 in the descending direction of the cut-off rod 1 in response to the descending command, and causes the cut-off rod 1 to move down.

  During the descending operation, the brake excitation waveform converter 65 detects a change period of the excitation voltage waveform generated in the electromagnetic brake 50 as needed. Then, the rotation angle detection section 67 detects the control rotation angle of the brushless motor 30 from the change period of the excitation voltage waveform as needed. The motor control unit 63 controls the drive of the motor drive unit 61 using the control rotation angle, and detects that the cut-off rod 1 has reached the descent reference position, and drives the brushless motor 30 by the motor drive unit 61. To stop. After that, the circuit 70 stops the supply of the motor power to the motor driver 60 and activates the electromagnetic brake 50 to hold the breaking rod 1 at the lowered position.

  During this time, the operation stop signal (H level) is being output from the motor control unit 63 to the D brake control circuit unit 66, so that the D brake control circuit unit 66 is in a stopped state.

  Subsequently, upon receiving a notification that the train has passed the railroad crossing, the circuit breaker circuit 70 again supplies the motor power from the power supply unit 10 to start the motor driver 60, and instructs the lifting operation of the circuit breaker rod 1. And the electromagnetic brake 50 is released (OFF). Then, in the motor driver 60, the motor control unit 63 drives the brushless motor 30 in the rising direction of the cut-off rod 1 in response to the rising command, and moves the cut-off rod 1 upward.

  During the ascending operation, the brake excitation waveform converter 65 detects the change period of the excitation voltage waveform generated in the electromagnetic brake 50 as needed, and the rotation angle detector 67 detects the control rotation angle of the brushless motor 30 from the change period of the excitation voltage waveform. Is detected at any time. The motor control unit 63 controls the drive of the motor drive unit 61 using the control rotation angle, and detects that the cutoff rod 1 has reached the ascending reference position, and controls the brushless motor 30 by the motor drive unit 61. Stop driving. Thereafter, the circuit 70 stops the supply of the motor power to the motor driver 60 and activates the electromagnetic brake 50 to hold the breaking rod 1 at the raised position. During this time, the operation stop signal (H level) is being output from the motor control unit 63 to the D brake control circuit unit 66, so that the D brake control circuit unit 66 is in a stopped state.

  As described above, according to the present embodiment, the D brake control circuit 66 can be operated by the excitation power generated in the electromagnetic brake 50 when the weight of the breaking rod 1 is lowered. When the breaking rod 1 starts to lower its own weight, the brake excitation waveform conversion unit 65 generates a pulse signal synchronized with the rotation cycle of the brushless motor 30 from the change cycle of the excitation voltage waveform generated in the electromagnetic brake 50 to generate the D brake. Output to the control circuit unit 66. The D brake control circuit unit 66 can apply a dynamic brake to the brushless motor 30 using the pulse signal. According to this, when an abnormality such as a power failure or a failure occurs, the breaking rod 1 at the ascending position can be lowered by its own weight at a constant speed.

  Note that, in the above-described embodiment, a case where a power failure occurs as an abnormal time has been exemplified. However, in addition to the power failure, some abnormality such as a failure may occur in the railroad crossing breaker 100. For example, it is conceivable that a malfunction occurs in the circuit of the motor control unit 63. Even when this motor control abnormality occurs, the level crossing breaker 100 performs the D brake control by the D brake control circuit unit 66 in the same manner as in the above-described embodiment. That is, when a motor control abnormality occurs, the control signal input to the D brake control circuit unit 66 is configured to be an operation permission signal (L level signal). The dynamic brake can be applied to the brushless motor 30 even when the vehicle 1 descends by its own weight.

  Further, there is an abnormality in which the device malfunctions when the cutoff rod 1 is held at the raised position, and the electromagnetic brake 50 is released (OFF). In this case, as in the case of a power failure, dynamic braking can be applied to the self-weight drop of the breaking rod 1.

  Further, the control method of the dynamic brake of the brushless motor 30 when the weight of the breaking rod 1 is lowered is not limited to the circuit configuration of the above-described embodiment. FIG. 6 shows an example of a control method of the dynamic brake together with a circuit configuration. For example, the control method in which the D brake control circuit unit 66 applies the dynamic brake to the brushless motor 30 via the motor drive unit 61 as described in the above embodiment can be said to be the FET control of FIG. As another example, a power generation control method using a power generation control circuit may be adopted, and the circuit configuration may be changed as shown in FIG. Further, a short-circuit control method using a correlated short-circuit control circuit may be employed to change the circuit configuration as shown in FIG.

  Further, in the above-described embodiment, the drive control of the brushless motor 30 has been described based on the excitation voltage waveform generated in the electromagnetic brake 50. However, as shown in FIG. 7, the rotation of the motor output shaft 331 is detected. The sensor 400 may be provided, and the drive control of the brushless motor 30 may be performed based on the detection signal of the sensor 400. FIG. 7 is a diagram illustrating a configuration example of a level crossing circuit breaker 200 according to a modification example corresponding to FIG. 1. A level crossing according to the above embodiment, except that a sensor 400 for detecting the rotation of the motor output shaft 331 of the brushless motor 30 is provided, and the rotation angle detection unit 67 detects the control rotation angle from the detection signal of the sensor 400. The configuration is the same as that of the circuit breaker 100.

REFERENCE SIGNS LIST 100 crossing breaker 1 breaker rod 3 breaker rod shaft 10 power supply unit 20 rotation transmitting mechanism 30 brushless motor 31 stator 311, 313, 315 coil 33 rotor 331 motor output shaft 333 permanent magnet 50 electromagnetic brake 51 stator 511, 513 coil 53 Rotor 60 Motor driver 61 Motor drive unit 63 Motor control unit 65 Brake excitation waveform conversion unit 651 Step-down circuit unit 653 Rectification circuit unit 655 Voltage detection unit 66 D brake control circuit unit 661 Constant voltage circuit 67 Rotation angle detection unit 70 Breaker circuit

Claims (2)

A motor output shaft as a high-speed shaft, a deceleration mechanism portion composed of a plurality of shafts with a breaking rod shaft of the breaking rod as a low-speed shaft, a brushless motor that rotates the motor output shaft and moves the breaking rod up and down, When the drive of the brushless motor is stopped and the cut-off rod is located at a predetermined raised position or a predetermined lowered position, the brushless motor is activated to operate the motor output shaft or another high-speed shaft (hereinafter collectively referred to as a "braking high-speed shaft"). A) a crossing breaker equipped with a non-contact type electromagnetic brake that brakes the rotation of a), a motor drive control device that applies a driving voltage to the brushless motor to move the breaking rod up and down;
When the breaking rod, which has been in the ascending position at the time of the abnormality, descends under its own weight (hereinafter abbreviated as “when its own weight descends”), (1) the excitation power generated in the electromagnetic brake by the rotation of the braking high-speed shaft is used as a power supply operatively configured and, (2) the based on the waveform signal of a periodic excitation voltage generated in the electromagnetic brake, the rotational speed of the brushless motor is suppressed so that constant speed, the dynamic brake control circuit unit ,
A motor drive control device comprising: A motor output shaft as a high-speed shaft, and a deceleration mechanism unit composed of a plurality of shafts with a breaking rod shaft of the breaking rod as a low-speed shaft;
A brushless motor that rotates the motor output shaft to move the breaking rod up and down,
A non-contact type electromagnetic brake that operates when the drive of the brushless motor is stopped and the breaking rod is located at a predetermined ascending position or a predetermined descending position to brake the rotation of the braking high-speed shaft,
A motor drive control device according to claim 1 ,
Level crossing machine equipped with.

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