KR20080003767A - Electromagnetic brake control device - Google Patents

Abstract

An electromagnetic brake control device where a control device body releases an electromagnetic brake device by exciting a brake coil to cause it to attract an armature. The control device body can detect the start of release operation of the armature by the attraction by the brake coil. When the start of the release operation is detected, the brake device body reduces the attraction force occurring in the brake coil to a level less than that occurs before the start of the release operation.

Description

Electronic brake control device {ELECTROMAGNETIC BRAKE CONTROL DEVICE}

TECHNICAL FIELD This invention relates to the electromagnetic brake control apparatus which controls the exciting state of a brake coil, for example in an electromagnetic brake apparatus, such as an elevator brake apparatus.

In a conventional electromagnetic brake apparatus, an armature is applied to an electromagnetic field at the time of release of the brake by using an excitation current command means for incrementing an excitation current command of the brake coil until reaching a preset value. The collision sound which arises by colliding with is aimed at reducing (for example, refer patent document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 9-267982

However, in the conventional electromagnetic brake apparatus as described above, since the exciting current of the brake coil is simply increased, the release operation time becomes considerably longer when an electromagnet having a large time constant is used. In addition, since the gap between the electromagnet and the armature, the spring force of the braking spring, the electromagnetism, and the secular variation of those are not taken into consideration, the effect of reducing the impact sound cannot be stably obtained. .

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an electronic brake control device capable of stably reducing the collision sound at the time of brake release while suppressing prolongation of the brake release operation.

The electromagnetic brake control device according to the present invention includes a control device main body for releasing the brake coil to attract the armature to the brake coil, thereby releasing the electromagnetic brake device, and the control device main body is provided with the armature by suction of the brake coil. The start of the release operation can be detected. When the start of the release operation is detected, the suction force generated in the brake coil is reduced than before the start of the release operation.

Moreover, the electromagnetic brake control apparatus by this invention is provided with the braking system main body which releases an electromagnetic brake apparatus by exciting a brake coil and attracting an armature to a brake coil, and a control apparatus main body measures the time from the excitation start of a brake. Thus, the suction force of the brake coil is increased when a predetermined time elapses from the start of exciting the coil.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the elevator apparatus by Embodiment 1 of this invention.

FIG. 2 is a block diagram showing the configuration of the control apparatus main body of FIG. 1.

FIG. 3 is a flowchart showing an operation of releasing the brake of the controller main body of FIG. 1.

4 is a graph showing a change in the current command of the main body of the control device of FIG. 1 and a change in the current flowing through the brake coil.

FIG. 5 is a graph showing the movement of the armature of FIG. 1 when the brake is released and the change of the voltage command when the brake is released.

It is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 2 of this invention.

FIG. 7 is a flowchart showing an operation of releasing the brake of the controller main body of FIG. 6.

FIG. 8 is a graph showing a relationship between an operation start time and a control command value in the gap pressing force compensator of FIG. 6.

It is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 3 of this invention.

FIG. 10 is a flowchart showing an operation of releasing the brake of the controller main body of FIG. 9. FIG.

It is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 4 of this invention.

FIG. 12 is a flowchart showing an operation of releasing the brake of the control apparatus main body of FIG. 11.

It is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 5 of this invention.

FIG. 14 is a flowchart showing an operation of releasing the brake of the control apparatus main body of FIG. 13.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described with reference to drawings.

Embodiment 1.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the elevator apparatus by Embodiment 1 of this invention. In the drawing, the car 1 and the balance weight 2 are suspended in the hoistway by the main rope 3, and the hoist 1 lifts the inside of the hoistway by the driving force of the hoisting machine 4.

The hoist 4 has a drive sheave 5 in which the main rope 3 is wound, a motor 6 for rotating the drive sheave 5, and a drive sheave 5 in conjunction with the running of the car 1. And an electromagnetic brake device 8 for braking the rotation of the brake drum 7 and the driving sheave 5 as the brake rotating body which is integrally rotated with each other.

The electromagnetic brake device 8 includes a brake shoe 9 which is folded to the brake drum 7, an armature 10 connected to the brake shoe 9, and a brake shoe 9. Braking springs 11 pressed against the armature 10 and armature 10 are disposed so as to resist the braking springs 11 and to attract the brake shoes 9 from the brake drum 7 The electromagnet 11 which generate | occur | produces, and the release | release detection switch 12 which detects that the armature 10 displaced to the all release position is provided. The brake coil 13 is provided in the electromagnet 11.

The excited state of the brake coil 13 is controlled by the controller main body 14. The control device main body 14 is input with a detection signal from the current detector 15 for detecting a current value supplied to the brake coil 13.

FIG. 2 is a block diagram showing the configuration of the control apparatus main body 14 of FIG. In the figure, the current command generation unit 16 generates a current command for flowing a current through the brake coil 13 in accordance with the brake release command. The current control unit 17 receives a current command from the current command generation unit 16 and a detection signal from the current detector 15. The current control unit 17 generates a voltage command which is a command relating to the voltage value applied to the brake coil 13 so that the actual current value of the brake coil 13 matches the value of the current command.

The voltage command from the current control unit 17 is input to the brake coil 13 via the limiter 18. In addition, the value of the voltage command from the current control unit 17 is differentiated in the derivative unit 19 and input to the release operation detection unit 20. The release operation detection unit 20 detects the start of the release operation (displacement) of the armature 10 by comparing the output of the derivative unit 19 with a preset threshold. That is, the release operation detection unit 20 detects the release operation of the armature 10 based on the time change of the value of the voltage command.

When the release operation of the armature 10 is detected, the information is input from the release operation detection unit 20 to the current command adjustment unit 21 and the control time detection unit 22. The current command adjustment unit 21 changes the value of the current command based on the information from the release operation detection unit 20 and sends it to the current control unit 17. Specifically, when the start of the release operation is detected, the current command adjuster 21 reduces the suction force generated in the brake coil 13 than before the start of the release operation.

The control time detector 22 counts the time (control time) from the start of the release operation of the armature 10. Moreover, the timer 23 counts the time after starting the excitation of the brake coil 13 according to the brake release command.

When the preset time Tend has elapsed from the start of the excitation of the brake coil 13, the control unit 14 stops the adjustment of the current command in the current command adjusting unit 21 and reduces the suction force before reducing the brake coil 13. Raises in. In addition, when the preset time Tcend has elapsed from the start of the release operation of the armature 10, the control unit 14 stops the adjustment of the current command in the current command adjustment unit 21 and reduces the suction force before reducing the brake coil. To (13).

The control apparatus main body 14 is provided in the elevator control apparatus which controls the operation of the cage | basket | car 1. The elevator control device has a control panel (not shown) having an arithmetic processing unit (CPU), a storage unit (ROM, RAM, hard disk, etc.) and a signal input / output unit. The function of the control apparatus main body 14 is implemented by this control panel. For this reason, a program for realizing the above functions is stored in the storage unit of the control panel.

Next, the operation will be described. FIG. 3 is a flowchart showing an operation of releasing the brake of the control device main body 14 of FIG. 1. When the door of the cage | basket | car 1 closes and preparations for starting of a lift start are completed, the brake release command is input into the control apparatus main body 14. As shown in FIG. As a result, the initial current command value I ^* p is output from the current command generation unit 16 as the value I ^* of the current command (step S1). At the same time, the timer 23 is reset to start counting the time T from the start of excitation (step S2).

Next, the current control unit 17 generates a voltage command u so that the actual current value I of the brake coil 13 matches the value I ^* of the current command (step S3). At this time, if the differential gain is Kd and the proportional gain is Ki, the voltage command is obtained from the following equation, for example.

u = [{(Ki + Kd) / Kd} I ^* -I] Kd (1)

However, the voltage command input to the brake coil 13 is limited to less than the upper limit u 'at the limiter 18 for the protection of the circuit (u <u').

When the voltage command is input to the brake coil 13, the coil real current I increases at any time constant, and the voltage command u gradually decreases according to equation (1).

When the time T from the start of the excitation exceeds the preset time T1 (step S4), the output of the derivative value from the derivative unit 19 to the release operation detection unit 20 is started (step S5). Here, the time T1 from the start of the output of the derivative value is set to a value smaller than the time Tp from the start of the excitation to the start of the release operation of the normal armature 10.

Subsequently, when the coil real current increases and the suction force generated in the brake coil 13 overcomes the spring force of the brake spring 11, the release operation of the armature 10 is started. At this time, the induced electromotive force is generated in the direction of inhibiting the magnetic flux change (in this case, the direction in which the current value decreases), but the value of the voltage command is increased by the current controller 17 to compensate for the current decrease. Therefore, at the start of the release operation of the armature 10, the derivative value output from the derivative unit 19 changes from negative to positive.

The derivative value a obtained by the derivative unit 19 is compared with the threshold a '(> 0) preset by the release operation detection unit 20 (step S6). When the derivative value a exceeds the threshold a ', the start detection signal of the release operation is output from the release operation detection unit 20. As a result, the control time detection unit 22 is reset, and the count of the time Tc from the start of the release operation of the armature 10 is started (step S7). In addition, the value I ^* of the current command inputted to the current control unit 17 by the current command adjusting unit 21 is changed from the initial current command value I ^* p to the control command value I ^* c (I ^* c <I ^* p). It is switched (step S8).

When the value I ^* of the current command is switched to the control command value I ^* c, the voltage command u is corrected by the current control unit 17 (step S9). Here, the control command value I ^* c is set to the minimum necessary value for the release operation of the armature 10. That is, the impact force and the impact sound when the armature 10 collides with the electromagnet 11 are reduced by lowering the current value to the minimum required after the release operation of the armature 10 starts. On the other hand, the time until the release operation starts is minimized by flowing the electric current of the performance limit of the power supply and the brake coil 13 until the armature 10 starts a release operation.

After the voltage command is corrected according to the decrease of the current command value, whether or not the time T from the start of excitation has reached Tend (step S10) and whether the time T from the start of release operation has reached Tcend ( Step S11) is monitored. Then, if either of T> Tend and Tc> Tcend is satisfied, the value I ^* of the current command is returned to the initial current command value I ^* p regardless of the situation of the release operation (step S12).

Thereafter, it is monitored whether or not the release detection switch 12 is turned on (step S13). When the release detection switch 12 is turned on, it is determined that the armature 10 is displaced to the release position and the release operation is completed, and the value of the current command is switched to the holding current command value I ^* h (step S14).

4 is a graph showing the change of the current command of the control unit main body 14 of FIG. 1 and the change of the electric current which flows through the brake coil 13, FIG. 5 is the movement at the time of brake release of the armature 10 of FIG. And a graph showing the change of the voltage command when the brake is released. 4 and 5, when the actual release operation of the armature 10 is started, and the derivative value of the voltage command exceeds the threshold a ', the value of the current command is switched to the control current value I ^* c. The value of the current flowing through the brake coil 13 is also reduced to Ic.

In such an electronic brake control device, the start of the release operation of the armature 10 by the suction of the brake coil 13 can be detected. When the start of the release operation is detected, the suction force generated in the brake coil 13 is released. Since it is reduced than before, the collision sound at the time of brake release can be stably reduced for all the electromagnetic brake devices, while suppressing prolongation of the brake release operation.

Moreover, the control apparatus main body 14 is a current command generation part 16 which generate | occur | produces a current command according to a brake release command, and the electric current which produces | generates a voltage command so that the real current value of the brake coil 13 may correspond with the value of an electric current command. Since the control unit 17 and the release operation detection unit 20 detects the release operation of the armature 10 based on the change in the value of the voltage command, the start of the release operation of the armature 10 can be detected more reliably. can do. In addition, the detection of the release operation of the armature 10 may be performed by a sensor capable of continuously detecting the movement (displacement) of the armature 10.

In addition, when the preset time Tend has elapsed since the start of the excitation of the brake coil 13, the controller main body 14 generates a suction force before the reduction, so that the control device for reducing the suction force is released. The operation can be performed more reliably, and the reliability can be improved.

In addition, when the preset time Tcend elapses from the start of the release operation of the armature 10, the controller main body 14 generates a suction force before the reduction to the brake coil 13, thereby performing the release operation more reliably. This can be done, and the reliability can be improved.

Embodiment 2.

6 is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 2 of this invention. In addition to the structure of Embodiment 1, the control apparatus main body 14 has the operation start time detection part 24 and the gap pressing force compensation part 25. As shown in FIG. The operation start time detection unit 24 detects the operation start time Tp, which is the time from the start of the excitation of the brake coil 13 to the start of the release operation of the armature 10, and sends the result to the gap pressing force compensating unit 25. send.

The gap / pressing force compensator 25 changes the control command value based on the operation start time Tp obtained by the operation start time detection unit 24. Specifically, the gap pressing force compensator 25 has a current value of the brake coil 13 even when the gap between the electromagnet 11 and the armature 10 or the pressing force of the brake spring 11 changes. The control current value is obtained so that the minimum necessary value for operating (10) is obtained.

FIG. 7 is a flowchart showing an operation of releasing the brake of the control device main body 14 of FIG. 6. When the start detection signal of the release operation of the armature 10 is output from the release operation detection unit 20, the measurement result Tp 'of the operation start time Tp is sent to the gap / pressing force compensator 25 and the armature 10 The count of the time Tc from the start of the release operation is started (step S15).

The control command reference value Icr (Icr <Ip) set in advance is input to the gap-pressing force compensator 25. When the operation start time Tp 'is input, the gap / pressing force compensator 25 calculates the control command value I ^* c using the correction coefficient Ka as follows (step S16).

I ^* c = Tp'ka + Icr ... (2)

Where I ^* cmin <I ^* c <I ^* cmax

I ^* cmin: Lower limit of control command value

I ^* cmax: Upper limit of control command value

8 is a graph showing the relationship between the operation start time and the control command value in the gap pressing force compensator 25 of FIG. 6. Other configurations and operations are the same as those in the first embodiment.

In such an electromagnetic brake control device, the control command value is changed based on the time from the start of the excitation to the start of the release operation. Thus, despite the gap or the pressing force, the current value of the brake coil 13 after the start of the release operation is minimized. You can adjust it to the required value.

Embodiment 3.

Next, FIG. 9 is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 3 of this invention. In addition to the structure of Embodiment 2, the control apparatus main body 14 has the time constant detection part 26 and the coil resistance compensation part 27. As shown in FIG. The time constant detection unit 26 detects a time Tr from the start of the excitation of the brake coil 13 to the actual current value I of the brake coil 13 reaches a preset value I ₁ , and compensates the result of the coil resistance. It sends to part 27. The set value I ₁ is set to a value smaller than the current value at the start of the release operation of the armature 10.

The coil resistance compensator 27 corrects the measurement result Tp in the operation start time detector 24 based on the information from the time constant detector 26 and sends it to the gap / pressing force compensator 25. Specifically, the coil resistance compensator 27 corrects the operation start time Tp to compensate for the change in the time constant accompanying the temperature change of the brake coil 13 in the release operation start time Tp of the armature 10.

FIG. 10 is a flowchart showing an operation of releasing the brake of the control apparatus main body 14 of FIG. 9. In prior to the start of release operation of the armature (10), by the time constant detecting section 26, a determination of more than the current setting value I ₁ of the brake coil 13 whether monitoring (step S17), setting values I ₁ The time Tr until it reaches is measured (step S18). The measurement result Tr 'of the time Tr is sent to the coil resistance compensator 27.

When the start detection signal of the release operation of the armature 10 is output from the release operation detection unit 20, the measurement result Tp 'of the operation start time Tp is sent to the coil resistance compensator 27 and the armature 10 is released. The count of time Tc from the start of operation is started (step S15).

When time Tr 'and the operation start time Tp' are input, the coil resistance compensator 27 calculates the correction value Tp "of the operation start time Tp as follows using the correction coefficient Kr and the preset reference value Trr (step S19). .

Tp "= Tp'-krTr '/ Trr ... (3)

The gap / pressing force compensator 25 calculates the control command value I ^* c as follows using the correction coefficient Ka when the operation start time Tp "is input (step S20).

I ^* c = Tp "· ka + Icr ... (4)

Where I ^* cmin <I ^* c <I ^* cmax

Other configurations and operations are the same as those in the first embodiment.

In such an electronic brake control device, since the change in the operation start time Tp due to the change in the resistance of the brake coil 13 is compensated for, the current of the brake coil 13 after the release operation starts despite the temperature change in the brake coil 13. You can adjust the value to the minimum required value.

Embodiment 4.

Next, FIG. 11 is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 4 of this invention. In the first to third embodiments, a current command is generated to control the suction force of the brake coil 13, whereas in the fourth embodiment, the suction force of the brake coil 13 is controlled by generating a voltage command.

In the figure, the voltage command generation unit 31 generates a voltage command for applying a voltage to the brake coil 13 in accordance with the brake release command. The voltage command is input to the brake coil 13 through the voltage command adjusting unit 34 and the limiter 18. The coil real current value detected by the current detector 15 is differentiated by the derivative unit 32 and input to the release operation detection unit 33. The release operation detection unit 33 detects the start of the release operation of the armature 10 by comparing the output of the derivative unit 32 with a preset threshold. In other words, the release operation detection unit 33 detects the release operation of the armature 10 based on the time change of the coil actual current value.

When the release operation of the armature 10 is detected, the information is input from the release operation detection unit 33 to the voltage command adjustment unit 34 and the control time detection unit 22. The voltage command adjustment unit 34 changes the value of the voltage command based on the information from the release operation detection unit 33 and sends it to the limiter 18. Specifically, when the start of the release operation is detected, the voltage command adjuster 34 reduces the suction force generated in the brake coil 13 than before the start of the release operation.

The control time detector 22 counts the time (control time) from the start of the release operation of the armature 10. Moreover, the timer 23 counts the time after starting the excitation of the brake coil 13 according to the brake release command.

When the preset time Tend has elapsed since the start of the excitation of the brake coil 13, the control device main body 14 stops adjusting the voltage command in the voltage command adjusting unit 34 and reduces the suction force before reducing the brake coil 13. Raises in. In addition, when the preset time Tcend has elapsed from the start of the release operation of the armature 10, the control unit 14 stops adjusting the voltage command in the voltage command adjusting unit 34 and reduces the suction force before reducing the brake coil. To (13).

In addition, the structure of the whole elevator apparatus is the same as that of Embodiment 1 (FIG. 1).

Next, the operation will be described. FIG. 12 is a flowchart showing an operation when the brake main body 14 of FIG. 11 is released. When the door of the cage | basket | car 1 closes and preparations for starting of a lift start are completed, the brake release command is input into the control apparatus main body 14. As shown in FIG. Thereby, the initial voltage command value u ^* u ^* p output as the value of the voltage control value from voltage command generation portion 31 (step S31). At the same time, the timer 23 is reset, and the count of the time T from the start of excitation is started (step S32).

The voltage command input to the brake coil 13 is limited to less than the upper limit u ^* at the limiter 18 (u <u ') (step S33) to protect the circuit. When the time T from the start of the excitation exceeds the preset time T1 (step S34), the output of the derivative value from the derivative unit 32 to the release operation detection unit 33 is started (step S35). Here, the time T1 from the start of the output of the derivative value is set to a value smaller than the time Tp from the start of the excitation to the start of the release operation of the normal armature 10.

Thereafter, when the coil real current increases and the suction force generated in the brake coil 13 overcomes the spring force of the brake spring 11, the release operation of the armature 10 is started. At this time, the induced electromotive force is generated in the direction of inhibiting the magnetic flux change (in this case, the direction in which the current value decreases). Therefore, at the start of the release operation of the armature 10, the derivative value output from the derivative part 32 changes from positive to negative.

The derivative value a obtained by the derivative unit 32 is compared with the threshold value a '(<0) set in advance by the release operation detection unit 33 (step S36). When the derivative value a becomes less than the threshold value a ', the start detection signal of the release operation is output from the release operation detection unit 33. As a result, the control time detection unit 22 is reset, and the count of the time Tc from the start of the release operation of the armature 10 is started (step S37). In addition, the voltage command adjusting unit 34 switches the value u ^* of the voltage command input to the limiter 18 from the initial voltage command value u ^* p to the control command value u ^* c (u ^* c <u ^* p). (Step S38).

That is, after starting the release operation of the armature 10, the voltage is lowered to the minimum required, thereby reducing the impact force and the impact sound when the armature 10 collides with the electromagnet 11. On the other hand, by applying the voltage of the performance limit of the power supply and the brake coil 13 until the armature 10 starts a release operation | movement, the time until a release operation starts is minimum.

After switching the voltage command value to the control command value u ^* c, whether or not the time T from the start of excitation has reached Tend (step S39) and whether the time Tc from the start of release operation has reached Tcend ( Step S40) is monitored. If any condition of T> Tend and Tc> Tcend is satisfied, the value u ^* of the voltage command is returned to the initial voltage command value u ^* p regardless of the situation of the release operation (step S41).

After that, it is monitored whether or not the release detection switch 12 is turned on (step S42). When the release detection switch 12 is turned on, it is determined that the armature 10 is displaced to the release position and the release operation is completed, and the value of the voltage command is switched to the holding voltage command value u ^* h (step S42).

In such an electronic brake control device, the start of the release operation of the armature 10 by the suction of the brake coil 13 can be detected. When the start of the release operation is detected, the suction force generated in the brake coil 13 is released. Since it is reduced than before, the collision sound at the time of brake release can be stably reduced for all the electromagnetic brake devices, while suppressing prolongation of the brake release operation.

Moreover, the control apparatus main body 14 detects the release | operation operation | movement of the armature 10 based on the voltage command generation part 31 which generate | occur | produces a voltage command according to a brake release command, and the change of the real current value of the brake coil 13. Since it has the release operation | movement detection part 33 mentioned above, the start of the release operation of the armature 10 can also be detected more reliably also by voltage control.

Embodiment 5.

Next, FIG. 13 is a block diagram which shows the control apparatus main body of the elevator apparatus by Embodiment 5 of this invention. In the figure, the command generator 41 generates an excitation command (current command or voltage command) for generating an electromagnetic attraction force to the brake coil 13 in accordance with the brake release command. The excitation command is input to the brake coil 13 through the command adjustment unit 42.

The timer 23 counts the time after starting the excitation of the brake coil 13 in accordance with the brake release command. When the predetermined time T1 has elapsed from the start of the excitation of the brake coil 13, the command adjustment unit 42 has a value different from the excitation command value from the command generator 41 when the excitation command value input to the brake coil 13 is obtained. Switch to

Specifically, the command adjustment unit 42 switches the excitation command value to reduce the suction force generated in the brake coil 13 when the time T1 is reached. The time T1 is set shorter than the time from starting the excitation of the brake coil 13 until the armature 10 collides with the electromagnet 11.

When the preset time Tend has elapsed from the start of the excitation of the brake coil 13, the control unit 14 stops the adjustment of the excitation command in the command adjustment unit 42, and applies the suction force before the reduction to the brake coil 13. Generate.

In addition, the structure of the whole elevator apparatus is the same as that of Embodiment 1 (FIG. 1).

Next, the operation will be described. FIG. 14 is a flowchart showing an operation of releasing the brake of the control device main body 14 of FIG. 13. When the door of the cage | basket | car 1 closes and preparations for starting of a lift start are completed, the brake release command is input into the control apparatus main body 14. As shown in FIG. As a result, the timer 23 is reset, and the count of time T from the start of excitation is started (step S51). The command generator 41 outputs the initial current command value I ^* p or the initial voltage command value u ^* p as the value of the initial excitation command (step S52).

When the initial excitation command is generated, it is monitored whether the time from the start of excitation has reached T1 (step S53). If T1 is not reached, the excitation command value remains the initial excitation command value. When the time from the start of excitation reaches T1, the command adjusting unit 42 switches the value of the exciting command input to the brake coil 13 from the initial exciting command value to the control command value (step S54). The control command value is the control current command value I ^* c (I ^* c <I ^* p) or the control voltage command value u ^* c (u ^* c <u ^* p).

In other words, after the predetermined time T1 has elapsed from the start of excitation of the armature 10, the suction force is reduced, so that the impact force and the impact sound when the armature 10 collides with the electromagnet 11 are reduced. On the other hand, immediately after the start of the excitation of the armature 10, the suction power of the performance limit of the power supply and the brake coil 13 is generated, thereby shortening the time until the start of the release operation.

After switching the excitation command value to the control command value, it is monitored whether or not the time T from the start of the excitation has reached Tend (step S55). When the time T from the start of the excitation reaches Tend, the value of the excitation command is returned to the initial excitation command value I ^* p or u ^* p regardless of the situation of the release operation (step S56).

After that, when the release detection switch 12 is turned on, it is determined that the armature 10 is displaced to the release position and the release operation is completed, and the value of the excitation command is switched to the holding excitation command value.

In such an electronic brake control device, since the suction force of the brake coil 13 is increased when the time Tend has elapsed from the start of the excitation of the brake coil 13, the release operation can be performed more reliably and the reliability can be improved. .

After the initial suction force is generated in the brake coil 13 immediately after the start of the excitation of the brake coil 13, when the time T1 elapses, the suction force of the brake coil 13 is reduced, and the time Tend is increased from the start of the excitation of the brake coil. When the elapsed time, the suction force of the brake coil 13 is returned to the initial suction force, so that the impact sound at the time of brake release can be stably reduced and the reliability can be improved while suppressing prolongation of the brake release operation.

In the fifth embodiment, the suction force of the brake coil 13 is reduced when the time T1 has elapsed from the start of the excitation. However, the conditions for switching the suction force are not limited to the time from the start of the excitation, but for example, the The operation, the position of the armature 10, the voltage value of the brake coil 13 or the current value of the brake coil 13 may be used.

In the fifth embodiment, when the time Tend has elapsed from the start of the excitation, the suction force of the brake coil 13 is returned to the initial suction force, but it is not necessarily returned to the initial suction force. A suction force slightly smaller than the suction force may be used.

In the fifth embodiment, when the time T1 has elapsed since the start of the excitation, the suction force of the brake coil 13 is reduced. However, the brake coil 13 generates the minimum necessary suction force for the attraction of the armature 10 immediately after the start of the excitation. When time Tend is reached, you may switch to the maximum suction force.

In addition, although the electromagnetic brake control apparatus of the elevator apparatus was demonstrated in Embodiment 1-5, this invention is applicable also to the electromagnetic brake control apparatus provided in the other apparatus.

In addition, although the electromagnetic brake apparatus of the type which presses the brake shoe 9 to the outer peripheral surface of the brake drum 7 was shown in FIG. 1, the type which presses a brake shoe to the inner peripheral surface of a brake drum may be sufficient.

In addition, the brake rotating body may be a brake disc. That is, the present invention can also be applied to a disc brake.

In addition, the brake rotating body may be integrated with the driving sheave.

Industrial Applicability According to the present invention, an electromagnetic brake control device for controlling an excited state of a brake coil in an electromagnetic brake device such as an elevator brake device can be provided.

Claims (11)

An electromagnetic brake control device comprising a control device main body for releasing an electromagnetic brake device by exciting a brake coil to attract an armature to the brake coil. The control apparatus main body is capable of detecting the start of the release operation of the armature by the suction of the brake coil, and when the start of the release operation is detected, the electronic brake control which reduces the suction force generated in the brake coil than before the start of the release operation. Device. The method according to claim 1, The control unit body A current command generation unit for generating a current command for causing a current to flow in the brake coil in accordance with a brake release command; A current controller for generating a voltage command which is a command relating to a voltage value applied to the brake coil so that the actual current value of the brake coil matches the value of the current command; A release operation detector for detecting a release operation of the armature based on a change in the value of the voltage command; And an electric current command adjusting unit which changes the value of the electric current command based on the information from said release operation detecting unit. The method according to claim 2, The control apparatus main body further has a derivative part which differentiates the value of the voltage command and sends it to the release operation detection unit, And the release operation detector detects the start of the release operation by comparing the output of the derivative with a preset threshold. The method according to claim 1, The control unit body A voltage command generator for generating a voltage command for applying a voltage to the brake coil in accordance with the brake release command; A release operation detector for detecting a release operation of the armature based on a change in a real current value of the brake coil; And a voltage command adjusting unit for changing a value of a voltage command based on information from said release operation detecting unit. The method according to claim 4, The control apparatus main body further has a derivative part that differentiates the actual current value of the brake coil and sends it to the release operation detection unit, And the release operation detector detects the start of the release operation by comparing the output of the derivative with a preset threshold. The method according to claim 1, The control device main body generates the suction force before the reduction in the brake coil when a predetermined time elapses from the start of exciting the brake coil. The method according to claim 1, The control device main body causes the brake coil to generate a suction force before the reduction when the preset time elapses from the start of the release operation of the armature. The method according to claim 1, And the control device main body adjusts a suction force generated after the release operation starts to the brake coil in accordance with an operation start time which is a time from the start of the release of the brake coil to the start of the release operation of the armature. The method according to claim 8, And the controller main body measures the time until the current value of the brake coil reaches a preset value before starting the release operation of the armature, and corrects the operation start time according to the measurement result. An electromagnetic brake control device comprising a brake device main body which releases an electromagnetic brake device by exciting a brake coil to attract an armature to the brake coil. The control device main body measures the time from the start of the excitation of the brake coil, and when a predetermined time has elapsed from the start of the excitation of the brake coil, increases the suction force of the brake coil. The method according to claim 10, The control device main body generates a predetermined initial suction force on the brake coil immediately after the start of the excitation of the brake coil, and then reduces the suction force of the brake coil according to a preset condition, and sets a predetermined time from the start of the excitation of the brake coil. When this elapses, the electronic brake control apparatus returns the suction force of the brake coil to the initial suction force.

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