JP4563429B2 - Brake control device - Google Patents

Description

  The present invention applies a braking force by pressing a braking piece against a braked body with a spring force, and releases the braking force with an electromagnetic coil of a magnetic driving means composed of an electromagnetic coil, a permanent magnet, and a yoke. The present invention relates to the control of a brake that performs an additional operation.

  Conventionally, the magnetic attraction means comprising a yoke, an electromagnetic coil, and a permanent magnet has been proposed as a brake device, all of which attract a movable body with a permanent magnet and put it in a braking state. Is to release the braking by exciting in the opposite direction to cancel the attractive force of the permanent magnet (see, for example, Patent Documents 1 to 5).

Further, an excitation circuit for an electromagnetic coil of the magnetic attraction means has been proposed (for example, Patent Documents 2 and 3).
Japanese Utility Model Publication No. 52-6679 Japanese Utility Model Publication No. 62-3329 Japanese Examined Patent Publication No. 62-4264 No.2-4258 JP 2000-186724 A

  As is often seen in elevator brake devices and the like, in general, a negative operation electromagnetic brake is used as a brake device. That is, the release and addition of the brake can be performed relatively easily by energizing and interrupting the direct current. When the excitation power supply is energized, the brake force is released by releasing the pressure applied to the braked body by the magnetic force of the electromagnet. When the excitation current is cut off, the braked body is pressed by the spring force to apply braking. An electromagnet with sufficient magnetic force is required.

  In recent years, machine room-less elevators that do not require a machine room at the top of the hoistway have become mainstream. In this case, it is necessary to install the hoisting machine in a limited space in the hoistway. That is, downsizing of the hoisting machine, particularly downsizing of the brake device has become important. Therefore, it is considered to reduce the size by using a permanent magnet together with the electromagnet.

  Brake devices using both electromagnets and permanent magnets are proposed in Patent Documents 1 to 5, in which permanent magnets are embedded in the yokes of the electromagnets, and the braked body is pressed by the magnetic force of the permanent magnets to apply braking. The magnetic force of the permanent magnet is repelled by the magnetic force of the electromagnet to release the pressure contact of the braked body and release the brake. However, there has been no proposal for applying braking by spring force and releasing the braking by using a combination of a permanent magnet and an electromagnet.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a brake control device that can be reduced in size when a brake is applied by a spring force and a brake is released by a combination of a permanent magnet and an electromagnet.

In order to achieve the above object, according to a first aspect of the present invention, a braking spring for pressing a braking piece against a braked body to apply braking, and an operation against the urging force of the braking spring to release the braking. The magnetic drive means comprises a first yoke, a second yoke, an electromagnetic coil, and a permanent magnet. The first or second yoke is used as a fixed body, and the other is a movable body. And a coil current excitation circuit including a coil current excitation circuit that performs excitation release by energizing the electromagnetic coil and performs brake addition operation by deenergizing the electromagnetic coil, wherein the coil current excitation circuit directs the electromagnetic coil to DC At the time of the brake release operation with the power source, the polarity excitation in one direction is performed, and at the time of the brake addition operation, the polarity excitation in the opposite direction to that at the time of the brake release operation is performed, and the coil current excitation circuit includes two sets of DC power sources, current limiting resistors and Consisting of contacts, front At the point of contact, the electromagnetic coil is excited in one direction by one DC power source during the braking release operation, and the electromagnetic coil is excited in the opposite direction by the other DC power source during the braking addition operation. It is characterized by.

With this configuration, the magnetic force of the permanent magnet when the brake release retention, reduce the size of the electromagnetic coil reduces the magnetic force of the electromagnetic coil, i.e. Rutotomoni reduces the excitation current of the electromagnetic coil, it is possible to simplify the exciting circuit of the electromagnetic coil As a whole, the magnetic attraction means and the brake device can be reduced in size.

According to a second aspect of the present invention, in the first aspect , the coil current excitation circuit includes a direct current power source, a constant current diode that makes a constant current with respect to a direct current output from the direct current power source, and an output of the constant current diode. It is characterized by comprising a current limiting resistor for controlling the direct current and a contact.

  With this configuration, the coil current holding current can be controlled at a constant level, and the same effect as in the first aspect can be obtained.

According to a third aspect of the present invention , in the first or second aspect , the magnetic attraction force of the magnetic drive means is set so that the brake cannot be released and held only by a permanent magnet.

  With this configuration, when the coil current is interrupted, an effect of returning to the braking applied state can be obtained.

According to a fourth aspect of the present invention , in the first or second aspect of the present invention, the magnetic driving unit is configured to be in a braking applied state when the electromagnetic coil is de-energized in a braking released holding state.

With this configuration, the same effect as in the third aspect can be obtained.

Moreover, in claim 5, in claim 1 or 2, the magnetic attraction force of the magnetic drive means, braking addition operation, it is characterized in that setting the movable member in the coil current can not brake release retention.

With this configuration, the same effect as in the third aspect can be obtained.

According to a sixth aspect of the present invention, the brake according to any one of the first to fifth aspects, wherein the magnetic driving means is provided with an open holding means for restricting the movement of the movable body in a brake applied state and holding the open state. Control device.

  With this configuration, it is possible to prevent the movable body from being sucked again and brought into the brake release state when returning to the brake addition state during the braking addition operation.

According to a seventh aspect of the present invention, in the fifth aspect of the present invention, the open holding means includes an engaging element and a pressing spring, and the engaging element is pressed against the movable side body by a spring force.

With this configuration, the same effect as in the fifth aspect can be obtained.

According to an eighth aspect of the present invention, in the fifth aspect of the present invention, the open holding means comprises an engaging element, a pressing spring, and an actuator. The spring is pressed against the movable body by a spring force, and the spring is pressed by the actuator. It is characterized by releasing the pressure and releasing the holding of the movable side body.

With this configuration, the same effect as in the fifth aspect can be obtained.

According to a ninth aspect of the present invention, in the fifth aspect of the present invention, the opening holding means holds the opening of the movable side body by a magnetic attraction means comprising a permanent magnet and a yoke.

With this configuration, the same effect as in the fifth aspect can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the brake control apparatus which can add a brake with spring force and can reduce in size in what performs a brake release operation | movement by the combined use of a permanent magnet and an electromagnet can be provided.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a brake control device of the present invention will be described with reference to the drawings.
1 to 9 show an embodiment of a brake control device according to the present invention. FIG. 1 is an overall configuration diagram of a drum brake as an example of the brake device. FIG. 2 is a non-adsorbed release of a second yoke as a movable body. FIG. 3 is a diagram showing an example of the shape of the permanent magnet shown in FIG. 2, FIG. 4 is an excitation circuit for the electromagnetic coil shown in FIG. 1, and FIG. 5 is a magnetic drive means shown in FIG. FIG. 6 is an operation timing diagram from the brake release operation to the brake addition operation of the magnetic drive means of FIG. 2, and FIG. 7 is a diagram of the magnetic flux and gap of the magnetic drive means. FIG. 8A and FIG. 8B are diagrams showing an example of a method for detecting the operation of the second yoke, which is a movable body, and FIG. Adsorption state, FIG. 8B is a diagram showing the second yoke in the adsorption state, and FIGS. 9A and 9B are movable of FIGS. 8A and 8B. Normal by the operation detection result of the second yoke is a diagram illustrating an abnormality determination.

  In FIG. 1, reference numeral 1 denotes a brake drum as a body to be braked, and a pair of braking pieces 2 abut on an outer peripheral braking surface 1 a of the brake drum 1. Reference numeral 3 denotes a pair of braking arms. The braking piece 2 is provided in the intermediate portion 3c, and the one end portion 3a is rotatably supported. Reference numeral 4 denotes a pair of braking springs disposed on the other end portion 3b of the braking arm 3. A spring force acts in the directions of arrows 4a and 4b, and the braking piece 2 exerts a pressing force on the braking surface 1a in the directions of arrows 2a and 2b. It is supposed to be.

  5a and 5b are magnetic drive means provided near the other end 3b of the brake arm 3 so as to release the pressing force to the brake drum 1 against the brake spring 4. The magnetic drive means 5a and 5b are composed of magnet portions 10a and 10b and second yokes 9a and 9b. The magnet portions 10a and 10b are permanent magnets 6a and 6b, electromagnetic coils 7a and 7b, and a first yoke 8a. , 8b. The first yokes 8a and 8b are provided with electromagnetic coils 7a and 7b and permanent magnets 6a and 6b. The magnet portions 10a and 10b have magnetic pole surfaces 11a and 11b of the first yokes 8a and 8b. The second yokes 9a and 9b are arranged to face the surfaces 11a and 11b. That is, the magnetic drive means 5a and 5b have two sets having the same shape and configuration, and are arranged substantially symmetrically with respect to the center line 1b of the brake drum 1. The movement of the second yokes 9a, 9b on the movable side (arrows 9c, 9d) passes through the first yokes 8a, 8b and exits to the opposite side, and the other end of the braking arm 3 3b is driven, and the brake piece 2 is integrally driven.

  In this embodiment, the first yokes 8a and 8b are fixed and the second yokes 9a and 9b are movable. Conversely, the first yokes 8a and 8b are movable and the second yokes 9a and 9b are fixed. May be. When the electromagnetic coils 7a and 7b are energized, the second yokes 9a and 9b are attracted and actuated in the direction of expanding the braking arm 3. A coil current excitation circuit 12 energizes the electromagnetic coils 7a and 7b, and controls the excitation current of the electromagnetic coils 7a and 7b. Reference numeral 13 denotes an AC power supply to be supplied to the coil current excitation circuit 12, and reference numeral 14 denotes a contact of an electromagnetic contactor for connecting or disconnecting the AC power supply 13, which is connected to the coil current excitation circuit 12 through the contact 14.

  In FIG. 2, the first yokes 8a and 8b have an E-shaped cross section, and permanent magnets 6a and 6b and electromagnetic coils 7a and 7b are moved in the movable direction of the second yokes 9a and 9b in the recesses of the E-shaped cross section ( Magnet portions 10a and 10b are formed in series with respect to arrows 9c and 9d). The magnetic pole surfaces 11c, 11d of the permanent magnets 6a, 6b and the magnetic pole surfaces 11a, 11b of the first yokes 8a, 8b are arranged in parallel to face the second yokes 9a, 9b with a certain gap.

  In this embodiment, the magnetic pole surfaces 11c and 11d of the permanent magnets 6a and 6b protrude from the magnetic pole surfaces 11a and 11b of the first yokes 8a and 8b, but they may be the same surface or may be recessed. The second yokes 9a and 9b are supported by shafts 16a and 16b, respectively. The shafts 16a and 16b are movably supported by the bearing 17 at the center of the first yokes 8a and 8b.

  This figure shows that the second yokes 9a, 9b are not attracted and opened when the electromagnetic coils 7a, 7b are not energized, and the magnetic flux 6c is generated by the permanent magnets 6a, 6b, but the second yoke 9a. , 9b does not act as a suction force because of the large gap with 9b. When the electromagnetic coils 7a and 7b are energized, the second yokes 9a and 9b are attracted and moved in the directions of arrows 9c and 9d. Reference numeral 18 denotes a gap holding piece which holds a fixed gap when the second yokes 9a and 9b are attracted and attracted to the magnet portions 10a and 10b. 15 is an opening holding means for the first yokes 9a, 9b, and holds the opening of the first yokes 9a, 9b, which are movable bodies when the electromagnetic coils 7a, 7b are not energized. An engagement element 15b is engaged and restrained in a recess 9e formed on the outer peripheral surface of the first yoke 9a, 9b.

  FIG. 3 shows the permanent magnets 6a and 6b of FIG. 1, which are annular permanent magnets 6a and 6b having a transversely concave cross section. N-poles and S-poles are formed on the concave protrusions. Although the circumferential side is the S pole, it may be formed in reverse.

  In FIG. 4, reference numeral 12 denotes a coil current excitation circuit, and 19a and 19b denote two sets of DC power sources 19 which are DC conversion elements for converting AC to DC. Reference numerals 20a and 20b are switching elements such as transistors and constitute a known complementary type. 21 is a coil current command means for commanding a current to flow through the electromagnetic coils 7a and 7b, 22 is a current detection means for detecting the current of the electromagnetic coils 7a and 7b, and 23 is a coil current control means, The switching element 20a, the command value of the coil current command means 21 and the detection value of the current detection means 22 are input, and the command value of the coil current command means 21 and the detection value of the current detection means 22 are matched. A drive signal is output to 20b, and the currents of the electromagnetic coils 7a and 7b are controlled.

  Reference numerals 24a and 24b denote diodes, and reference numerals 25a and 25b denote resistors, which perform voltage drop compensation between the base and emitter of the switching elements 20a and 20b. The coil current excitation circuit 12 includes the DC power source 19, the switching elements 20 a and 20 b, the coil current command means 21, the current detection means 22, and a coil current control means 23.

  That is, in this embodiment, since the switching elements 20a and 20b form a complementary type, when the output of the coil current control means is positive, the switching element 20a becomes conductive and the coil current in the P direction indicated by the solid line flows. When the output of the coil current control means is negative, the switching element 20b is turned on and the coil current in the N direction indicated by the dotted line flows. A discharge resistor 26 is connected in parallel with the electromagnetic coils 7a and 7b, and discharges and consumes the energy stored in the electromagnetic coils 7a and 7b when the power is shut off. It is set to about 10 times.

  In FIG. 5, as described above, the magnetic drive means 5a and 5b are substantially the same in the left-right symmetry. Therefore, the magnetic drive means 5a on one side is given a reference numeral and the other side is omitted. This figure shows a state in which the first yokes 9a and 9b are attracted by energizing the electromagnetic coils 7a and 7b so that the magnetic flux 7c is in the same direction as the direction of the magnetic flux 6c of the permanent magnets 6a and 6b. In this state, a constant gap is maintained by the gap holding piece 18.

  In this case, the magnetic flux 6c of the permanent magnets 6a and 6b and the magnetic flux 7c of the electromagnetic coils 7a and 7b are added and act on the first yokes 9a and 9b to be attracted. Further, in the open holding means 15, the engaging member 15b is released from the recess 9e by the suction movement of the first yokes 9a, 9b, and the restraint is released.

  Based on FIG. 6, the operation from the release of braking to the addition of braking, that is, the operation from time T1 to time T7 will be described.

  At time T1, the power supply contact 14 is connected, and at time T6, the contact is cut off. At T7, the coil current disappears. In the magnetic driving means 5a and 5b, the period from T1 to T5 is a brake releasing operation against the force of the braking spring 4, and T1 to T4 is a period for speeding up the brake releasing in the releasing operation promoting period, and T4 To T5 is the release holding period. The period from T5 to T7 is a period in which braking is applied by restoring the force of the braking spring 4 in the braking application operation. Although exaggerated in this figure, in a series of operation periods from T1 to T7, the braking release promotion period and the braking additional operation period are very short, and most are the braking release holding period.

That is, when a braking release command is received at time T1, the contact 14 is connected by the contact operation of (g), a positive direction pulse command is generated by the coil current command of (a), and the electromagnetic coils 7a and 7b are given. current starts to flow, an increase constant value of the target current value i ₁ according to the time constant of the circuit so that the coil current of (b). On the other hand, the magnetic flux passing through the gap by the permanent magnets 6a and 6b has a large magnetoresistance in the gap until time T1, and is almost zero. When the coil current flows at time T1, the second yokes 9a and 9b are magnetically attracted mainly by the magnetic flux generated by the electromagnetic coils 7a and 7b, and the magnet gap in (f) is reduced. As the magnet gap becomes smaller, the gap passing magnetic flux by the permanent magnets 6a and 6b also increases. As shown in (e) total magnetic flux, the magnetic flux of the permanent magnets 6a and 6b and the magnetic flux of the electromagnetic coils 7a and 7b flow together. The gap passing magnetic flux by the permanent magnets 6a and 6b and the electromagnetic coils 7a and 7b is constant in the attracted state of the second yokes 9a and 9b.

  The magnet gap between the first yokes 8a and 8b and the second yokes 9a and 9b is gradually narrowed from the time T1 as shown in (f), but it is sharply narrowed from the middle T2 and time T3. Then, it is completely sucked to the second yoke 9a, 9b side, and is in an adsorption holding state at the time T4.

In the initial operation at the time of braking release from the time T1 to the time T4, a pulse-like command is given to increase the coil current at the initial energization to speed up the braking release operation. After the second yokes 9a and 9b are completely attracted, the magnet gap is reduced, so that the magnetic resistance of the magnetic circuit is reduced and the spring force is reduced even if the exciting current flowing through the electromagnetic coils 7a and 7b is small. since the suction force is generated to overcome, lower the (a) coil current command at time T4, i.e. by lowering the coil current, the period from T4 to T5 is a constant holding current of the target current value i _2. During this period, since the magnetic flux of the permanent magnets 6a and 6b is applied, the magnetic flux component of the electromagnetic coils 7a and 7b can reduce the coil current of (b) to near zero. In the absence of the permanent magnets 6a and 6b, as shown by the dotted line in the coil current of (b), a large current as in the prior art is required. The difference between the dotted line and the solid line is the effect of the permanent magnets 6a and 6b.

Then, at time T5, in response to a braking addition command, a negative pulse direction command is generated by the coil current command (a), and the currents of the electromagnetic coils 7a and 7b are in accordance with the time constant of the circuit as in (b) coil current. reduced through zero, it flows in the negative direction of the target current value i _3. The coil current command is cut off at time T6, the coil current becomes zero according to the time constant of the circuit, and the total magnetic flux in the magnet gap approaches zero as shown in (d). The second yokes 9a and 9b are pushed back by the force of the brake spring 4, and the magnet gap is also returned and enlarged as shown in (f). Since the magnetic gaps of the permanent magnets 6a and 6b are also large, the gap passing magnetic flux becomes almost zero.

  As described above, during the period from T5 to T6, the magnetic flux of the electromagnetic coils 7a and 7b is generated in the direction opposite to the magnetic flux direction of the permanent magnets 6a and 6b. This is to speed up the braking operation. That is, in order to reduce the size of the electromagnetic coils 7a and 7b, the brake release is held with the magnetic force of the permanent magnets 6a and 6b as much as possible to reduce the magnetic force of the electromagnetic coils 7a and 7b, that is, to reduce the coil current. Therefore, if the magnetic force of the permanent magnets 6a and 6b is strong, the return to the braking applied state is delayed even if the coil current is interrupted. In the opposite direction. The time and magnitude of applying the reverse magnetic flux are set so that the first yokes 9a and 9b are attracted again and the brake is not released.

  In FIG. 7, the relationship between the total magnetic flux of the magnet gap until the second yokes 9a and 9b are completely attracted and the magnet gap are as follows when braking is released (when the magnetic flux is increased) and when braking is applied (when the magnetic flux is reduced). There is hysteresis, and the magnetic flux with which the second yokes 9a and 9b operate when braking is applied is smaller than when braking is released. That is, in correspondence with the characteristics of the magnet gap (f) in FIG. 6, at the time of brake release, the brake release start point a → the change start point b where the magnet gap becomes narrower (the suction displacement start point of the second yokes 9a and 9b). ) → Complete suction, adsorption point c → maximum magnetic flux d point, and it becomes the magnetic flux g point of braking release holding. When braking is applied, the braking release holding point g → the change starting point e where the magnet gap becomes wider (the second yokes 9a and 9b start returning) → the point f where the brake piece 2 contacts the brake drum 1 Elapse.

  Since the second yokes 9a and 9b and the braking piece 2 move integrally through the braking arm 3, the movement of the second yokes 9a and 9b may be the movement of the braking piece 2 in this description. it can. In this case, at the magnetic flux g for holding the brake release, the magnetic flux components of the permanent magnets 6a and 6b are set to, for example, the h point after the e point, and the magnetic flux components of the electromagnetic coils 7a and 7b are the g point-h point. This point h is adapted to be in a braking applied state by the spring force of the braking spring 4 when the magnetic flux of the electromagnetic coils 7a and 7b is interrupted.

  That is, as the h point exceeds the e point and is closer to the g point, the magnetic flux components of the permanent magnets 6a and 6b increase, and the magnetic flux components of the electromagnetic coils 7a and 7b can be reduced. Therefore, the electromagnetic coils 7a and 7b can be further downsized. However, when the magnetic flux of the electromagnetic coils 7a and 7b is interrupted, the braking force is not applied by the spring force of the braking spring 4. Considering the certainty of the braking additional operation, it is preferable to set the magnetic attractive force of the permanent magnets 6a and 6b to be less than the spring force of the braking spring 4 when the energization of the electromagnetic coils 7a and 7b is cut off as described above. is there.

  Therefore, as described above, since the brake release holding time is overwhelmingly long in the brake release and additional operation time from T1 to T6 in FIG. 6, the amount of current reduction from the dotted line to the solid line shown in (b) coil current in FIG. As a result, the temperature rise of the electromagnetic coils 7a and 7b is reduced, so that the electromagnetic coils 7a and 7b are reduced in size, the magnet portions 10a and 10b are reduced in size, and the magnetic drive means 5a and 5b are reduced in size. The effect of reducing the size of the brake device can be obtained.

  8A and 8B, FIG. 8A shows that the electromagnetic coils 7a and 7b are not energized and the first yokes 9a and 9b, which are movable bodies, are not attracted, and FIG. 8B is that the electromagnetic coils 7a and 7b are energized and the first yoke. 9a and 9b indicate adsorption states. 27 is a bracket coupled to the first yokes 9a and 9b, 28 is a detecting means for detecting the non-adsorption state of the bracket 27, that is, the first yokes 9a and 9b, and 29 is a detection means of the first yokes 9a and 9b. There is a detecting means for detecting the suction state. The detection means 28 and 29 are, for example, microswitches. The detection means 28 is ON, the detection means 29 is OFF in the non-adsorption state of the first yokes 9a and 9b, and the detection means is in the adsorption state of the first yokes 9a and 9b. 28 is OFF, and the detection means 29 is ON.

  9A and 9B show determination of the state detection results of the first yokes 9a and 9b, which are movable bodies in FIGS. 8A and 8B. That is, as shown in FIG. 9A, when the first yokes 9a and 9b are not adsorbed, the detection means 28 is ON at 31, the detection means 29 is OFF at 31, and the operation is continued and the operation is continued. If 28 is OFF, 31 and the detection means 29 is ON, it is determined that the state is abnormal and the operation is stopped. As shown in FIG. 9B, when the first yokes 9a and 9b are attracted, the detection means 28 is OFF at 32, the detection means 29 is ON at 33, and the operation is continued. Is ON, 33 and the detection means 29 is OFF, it is determined that the state is abnormal and the operation is stopped.

  In FIGS. 8A and 8B, two switch configurations are described as the detection unit. However, the detection unit includes one detection unit that can continuously detect the state of the first yokes 9a and 9b, which are movable bodies. You may make it detect and judge a state with the magnitude | size of a detection output.

  Next, another embodiment of the coil current excitation circuit 12 will be described with reference to FIGS.

  FIG. 10 is an excitation circuit diagram of the electromagnetic coil corresponding to FIG. 4, and a current is passed through the electromagnetic coils 7a and 7b in the same pattern as in FIG. To control. The same parts as those in FIG.

  Reference numerals 14a and 14b are contacts of an electromagnetic contactor for connecting or disconnecting the AC power supply 13, and 19a and 19b are DC conversion elements for converting AC to DC to form two sets of DC power supplies 19. 34a and 34b are contacts for energizing and interrupting the electromagnetic coils 7a and 7b, 36a and 36b are constant current diodes for making the DC voltage constant with respect to the output voltages of the DC conversion elements 19a and 19b, and R0 and R1 are currents in the P direction. R2 is a current limiting resistor that limits current in the N direction, and is connected in series. Reference numeral 35 denotes a normally closed contact connected in parallel to the series connection portion of the constant current diode and the resistor R0. The coil current excitation circuit 12 in this embodiment includes a DC power source 19, contacts 34a, 34b, 35, constant current diodes 36a, 36b, and resistors R0, R1, R2.

  Next, based on FIG. 11, the operation from the release of braking to the addition of braking in the embodiment of FIG. 10, that is, the operation from time T1 to time T7 will be described. FIG. 11 is an operation timing chart from the brake releasing operation to the brake applying operation of the magnetic drive means. FIG. 11 is a diagram corresponding to FIG. 6, and the same parts are denoted by the same reference numerals and description thereof is omitted.

Brake release operation when the AC power source 13 contacts 14a and contacts 34a of the supply connection from T1 to T5, the contact 35 connecting from T1 at brake release promoting operation to T4, the target current value _{i 1} flows through the resistor R1. During brake release holding operation from T4 to T5 is a target current value _{i 2} flows through resistors R0 and R1. Contacts 14b and the contact 34b from T5 during braking additional operation until T6 is connected, the target current value _{i 3} flowing through the resistor R2. The coil excitation voltage has the same pattern as the coil current command shown in FIG.

  Thereby, the coil current of (b) flows through the electromagnetic coils 7a and 7b in the same manner as the coil current shown in FIG. The constant current diodes 36a and 36b are provided to keep the coil current in the P direction constant during the braking release holding operation and to keep the coil current in the N direction constant during the braking addition operation.

  As a result, the same effect as in the embodiment of FIG. 6 can be obtained, and the effect that the coil excitation circuit can be simplified can be obtained.

  Next, another embodiment of the coil current excitation circuit 12 will be described with reference to FIGS.

  FIG. 12 is an excitation circuit diagram of the electromagnetic coil corresponding to FIG. 4, and a current is passed through the electromagnetic coils 7a and 7b in the same pattern as in FIG. 4, except that a pair of DC power supplies are used, and a changeover switch and a current limiter are used. The coil current is controlled in the positive and negative directions by resistance. The same parts as those in FIG.

  Reference numeral 19 denotes a direct current conversion element that converts alternating current as direct current power into direct current, 36a and 36b denote constant current diodes that make a constant direct current with respect to the output voltage of the direct current conversion element 19, and R0 and R1 limit current in the P direction. The current limiting resistor R2 is connected in series with a current limiting resistor that limits the current in the N direction. Reference numeral 35 denotes a normally closed contact connected in parallel to the series connection portion of the constant current diode 36a and the resistor R0. Reference numeral 37 denotes a change-over switch having contact points 37a and 37b. The contact points 37a and 37b excite the coil current by switching in the P and N directions. The DC output of the DC conversion element 19 is connected through a normally closed contact 38 to the parallel connection of the electromagnetic coils 7 a and 7 b and the discharge resistor 26.

  This normally closed contact 38 is opened when the power is shut off and when the electromagnetic coil 7a, 7b discharge current is quickly extinguished. The coil current excitation circuit 12 in this embodiment includes a DC conversion element 19 as a DC power source, constant current diodes 36a and 36b, resistors R0, R1, and R2, and a changeover switch 37.

  Next, based on FIG. 13, the operation from the release of braking to the addition of braking in this embodiment, that is, the operation from time T1 to time T7 will be described. FIG. 13 is an operation timing diagram from the brake release operation to the brake addition operation of the magnetic drive means, corresponding to FIG. 6. The same parts are denoted by the same reference numerals, and description thereof is omitted.

The contact 14 of the AC power supply 13 is connected from T1 to T5 during the brake release operation, the contact 37a of the changeover switch is connected from T1 to T5 during the brake release operation, and the resistor R0 is connected from T1 to T4 during the brake release promotion operation. short contact 35 is connected, the target current value _{i 1} flows through the resistor R1. During brake release holding operation from T4 to T5 is a target current value _{i 2} flows through resistors R0 and R1. Contact 37a of the switch from T5 during braking additional operation until T6 connects the target current value i ₃ flowing through the resistor R2. The coil excitation voltage has the same pattern as the coil current command shown in FIG.

  Thereby, the coil current of (b) flows through the electromagnetic coils 7a and 7b in the same manner as the coil current shown in FIG. The constant current diodes 36a and 36b are provided to keep the coil current in the P direction constant during the braking release holding operation and to keep the coil current in the N direction constant during the braking addition operation.

  As a result, the same effect as in the embodiment of FIG. 6 can be obtained, and the effect that the coil excitation circuit can be simplified can be obtained.

  Next, another embodiment of the opening holding means 15 for the first yokes 9a and 9b will be described with reference to FIGS. 14A and 14B.

  FIG. 14A shows the open state of the first yokes 9a and 9b which are movable bodies in the non-adsorbed state in FIG. 2 and FIG. 14B shows the first yokes 9a and 9b which are movable bodies in the FIG. The adsorption state is shown. The difference from FIGS. 2 and 5 is that the engaging member 15b and the recess 9e are disengaged by an actuator during non-adsorption. The same parts as those in FIGS. 2 and 5 are denoted by the same reference numerals and description thereof is omitted.

  That is, in FIG. 14A, the open holding means 15 includes a push spring 15a, an engagement element 15b, and an actuator 15c. The engagement element 15b is engaged with the depression 9e of the first yokes 9a, 9b by the push spring 15a. The movement of the first yokes 9a and 9b is restricted.

  In FIG. 14B, at the same time as the electromagnetic coils 7a and 7b are energized, the actuator 15c drives the engagement element 15b and disengages the engagement element 15b from the recess 9e. Then, at the same time as the electromagnetic coils 7a and 7b are deenergized, the actuator 15c is released from driving, the first yokes 9a and 9b return to their original positions, and the engaging element 15b engages with the recess 9e and moves. to bound.

  As a result, the same effects as those of the embodiment of FIGS. 2 and 5 can be obtained, and the effect of reducing the resistance when the first yokes 9a and 9b are disengaged from the grooves 9e can be obtained.

  Next, another embodiment of the opening holding means 15 for the first yokes 9a and 9b will be described with reference to FIGS. 15A and 15B.

  FIG. 15A shows the open state of the first yokes 9a and 9b, which are movable bodies, in the non-adsorbed state in FIG. 2 and FIG. 15B shows the first yokes 9a and 9b which are movable bodies in the FIG. FIG. 15C shows the magnetic attraction means of this embodiment. 2 and 5 is that the movement of the first yokes 9a and 9b is restrained by a magnetic force such as a permanent magnet. The same parts as those in FIGS. 2 and 5 are denoted by the same reference numerals and description thereof is omitted.

  That is, in FIG. 15A, the open holding means 15 is composed of a base 39 and a magnetic attracting means 40, and is provided on the base 39 so that the magnetic attracting means 40 magnetically attracts the first yokes 9a and 9b. The first yokes 9a and 9b are sucked to the base side and the movement is restricted. When the first yokes 9a and 9b are sucked, a buffer 41 such as rubber is provided on the base in order to alleviate the collision impact with the base.

  Further, in FIG. 15B, when the electromagnetic coils 7a and 7b are energized, the first yokes 9a and 9b are attracted by the attraction force of the magnet portions 10a and 10b, and the restraints of the first yokes 9a and 9b are released. . When the energization of the electromagnetic coils 7a and 7b is interrupted, the first yokes 9a and 9b return to their original positions, and the movement of the first yokes 9a and 9b is caused by the magnetic attraction of the magnetic attracting means 40 of the base 39. Is restrained. The magnetic attraction means 40 is composed of a button-like permanent magnet 40a and a yoke 40b, for example, as shown in FIG. 15C.

  As a result, the same effects as those of the embodiment of FIGS. 2 and 5 can be obtained, and the effect of simplifying the engagement structure of the first yokes 9a and 9b can be obtained.

1 is an overall configuration diagram of a brake control device according to an embodiment of the present invention. It is an enlarged view of the magnetic drive means of FIG. 1 which shows the open state in the non-adsorption | suction of the 2nd yoke which is a movable body. It is a figure which shows an example of the shape of the permanent magnet of FIG. It is an excitation circuit of the electromagnetic coil of FIG. It is a figure which shows the adsorption | suction state of the 2nd yoke which is a movable body of the magnetic drive means of FIG. FIG. 3 is an operation timing chart from a brake release operation to a brake addition operation of the magnetic drive means of FIG. 2. It is a figure which shows the setting of the permanent magnet magnetic flux at the time of brake release holding | maintenance, and the relationship between the magnetic flux of a magnetic drive means, and a space | gap. It is a figure which shows an example of the operation | movement detection method of the 2nd yoke which is a movable body, and is a figure which shows a 2nd yoke in a non-adsorption state. It is a figure which shows an example of the operation | movement detection method of the 2nd yoke which is a movable body, and is a figure where a 2nd yoke shows an adsorption state. It is a figure which shows the normality / abnormality judgment by the action | operation detection result of the 2nd yoke which is the movable body of FIG. 8A. It is a figure which shows the normality and abnormality judgment by the action | operation detection result of the 2nd yoke which is the movable body of FIG. 8B. FIG. 5 is an equivalent circuit diagram of an electromagnetic coil according to another embodiment of the present invention, corresponding to FIG. FIG. 7 is an operation timing chart from the brake release operation to the brake addition operation in FIG. FIG. 5 is an excitation circuit diagram of an electromagnetic coil according to still another embodiment of the present invention, corresponding to FIG. 4. FIG. 7 is an operation timing chart from the braking release operation to the braking addition operation in FIG. It is a figure which shows the open holding | maintenance means which becomes other embodiment of this invention, and is a figure equivalent to FIG. It is a figure which shows the open holding | maintenance means which becomes other embodiment of this invention, and is a figure equivalent to FIG. It is a figure which shows the open holding | maintenance means which becomes further another embodiment of this invention, and is a figure equivalent to FIG. It is a figure which shows the open holding | maintenance means which becomes further another embodiment of this invention, and is a figure equivalent to FIG. It is a perspective view which shows the magnetic attraction | suction means of FIG. 15A and FIG. 15B.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Non-braking body 2 Brake piece 4 Brake spring 5a, 5b Magnetic drive means 6a, 6b Permanent magnet 7a, 7b Electromagnetic coil 8a, 8b First yoke 9a, 9b Second yoke 12 Coil current excitation circuit 15a Pusher 15b Engagement Coupling 15c Actuator 19, 19a, 19b DC power supply R0, R1, R2 Current limiting resistor 24 Coil current supply means 25 Coil current command means 26 Current detection means 27 Coil current control means 34a, 34b, 35, 37a, 37b Contact 28 Constant current Diode 40 Magnetic adsorption means 40a Permanent magnet 40b yoke

Claims (9)

The brake spring is configured to press a brake piece against the body to be braked to apply the brake, and a magnetic drive unit that operates against the urging force of the brake spring to release the brake. It consists of a yoke, a second yoke, an electromagnetic coil, and a permanent magnet. The first or second yoke is configured as a fixed body and the other as a movable body, and the electromagnetic coil is energized and energized to release braking. In a brake device equipped with a coil current excitation circuit that performs braking addition operation by deactivating the operation,
The coil current excitation circuit, said a unidirectional polarity excitation to the electromagnetic coil when the brake release operation with a DC power supply, with said during braking additional operation and polarity excitation of the brake releasing operation and reverse, the coil current excitation circuit Consists of two sets of DC power supplies, current limiting resistors and contacts, at which the electromagnetic coil is excited in one direction by one DC power supply during the braking release operation, and the electromagnetic coil is connected to the other DC A brake control device, wherein the power source is excited in the opposite direction to that during the brake release operation . The coil current excitation circuit includes a DC power supply , a constant current diode that makes a constant current with respect to a DC current output from the DC power supply, a current limiting resistor that controls the DC current output from the constant current diode, and a contact it is constituted by a brake control device according to claim 1, wherein. 3. The brake control device according to claim 1, wherein the magnetic attraction force of the magnetic drive means is set so that braking release cannot be held only by a permanent magnet . 3. The brake control device according to claim 1 , wherein the magnetic drive means is set to a braking applied state when the electromagnetic coil is deenergized in a brake released holding state . 3. The brake control device according to claim 1 , wherein the magnetic attraction force of the magnetic drive means is set to a coil current that cannot hold the movable body in a brake-released state during a braking operation . 6. The brake control device according to claim 1 , wherein the magnetic drive means is provided with an open holding means for restricting the movement of the movable body in a brake applied state and holding the open state . The open holding means, constituted by the engaging member and the pressing spring, the brake control apparatus according to claim 6, characterized in that so as to press the movable member the engaging element by the spring force. The release holding means includes an engagement element, a pressing spring, and an actuator, presses the engagement element against the movable side body by a spring force, and releases the pressing force of the spring by the actuator to release and hold the movable side body. The brake control device according to claim 6 , wherein the brake control device is released . 7. The brake control device according to claim 6 , wherein the opening holding means holds the movable side body open by a magnetic attraction means comprising a permanent magnet and a yoke .

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