Electromagnetic brake control device, electromagnetic brake control method, electromagnetic brake control program, and electromagnetic control device

Abstract

An electromagnetic brake control device 14 comprises a first current path (I1) and a second current path (I2) that branch from a coil 31 of an electromagnetic brake 30, a transistor 142 that is provided to the first current path and controls the first current path between a conducting state and a not-conducting state, a smoothing capacitor 12 that is provided to the second current path, and a pulse width modulation unit 143 that can switch between an excitation mode in which the first current path is switched to the conducting state by the transistor 142 and the coil 31 is energized and a demagnetization mode in which the first current path is switched to the not-conducting state by the transistor 142 and the coil 31 is demagnetized by the charging of the smoothing capacitor 12 via the second current path.

Description

[Technical Field]

[0001] The present invention relates to a control technology for electromagnetic products such as electromagnetic brakes equipped with coils. [Background technology]

[0002] Patent Document 1 discloses an LED power supply device (10; the reference numerals in parentheses are the same as those in Patent Document 1, hereinafter) as an electromagnetic product equipped with a coil. The LED power supply device (10) includes two transistor switches (S1, S2), which are simultaneously turned on and off to energize the primary coil of a transformer (T) and charge the capacitor (C1) with back electromotive force. That is, when the two switches (S1, S2) are simultaneously turned on, current flows from the high potential side to the low potential side of the first switch (S1), the transformer (T), and the second switch (S2), in that order, energizing the primary coil of the transformer (T). When the two switches (S1, S2) are simultaneously turned off, the back electromotive force generated in the transformer (T) causes current to flow from the low potential side to the high potential side of the diode (D2), the transformer (T), and the diode (D1), in that order, maintaining the primary coil of the transformer (T) in a conducting state and charging the capacitor (C1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-58128 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the technology of Patent Document 1, the power consumption of an electromagnetic product can be reduced by charging a capacitor (C1) with the back electromotive force generated in the primary coil of a transformer (T). However, since two switches (S1, S2) are required, along with a control circuit (20) to control them, this may lead to a complex configuration of the electromagnetic product and an increase in costs.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic brake control device and an electromagnetic control device with a simple configuration. [Means for solving the problem]

[0006] In order to solve the above problems, an electromagnetic brake control device according to one embodiment of the present invention comprises a first current path and a second current path branching from a coil of an electromagnetic brake, a control element provided in the first current path that controls the first current path between a conductive state and a non-conductive state, and a capacitor provided in the second current path.

[0007] In this aspect, when the control element causes the first current path to be in a conducting state, current flows through the coil via the first current path, and when the control element causes the first current path to be in a non-conducting state, current flows through the coil via the second current path due to the back electromotive force generated in the coil, and the capacitor is charged. According to this aspect, current can be passed through the coil and the capacitor can be charged by the back electromotive force using a single control element, thereby simplifying the configuration compared to Patent Document 1, which requires two switches (S1, S2).

[0008] Another aspect of the present invention is a method for controlling an electromagnetic brake in which a first current path including a control element and a second current path including a capacitor branch off from a coil, the method including an excitation step of switching the first current path to a conductive state by the control element to excite the coil, and a demagnetization step of switching the first current path to a non-conductive state by the control element to demagnetize the coil by charging the capacitor via the second current path.

[0009] Yet another aspect of the present invention is an electromagnetic control device including a first current path and a second current path branching from a coil through which a current flows in a fixed direction, a control element provided in the first current path for controlling the first current path between a conductive state and a non-conductive state, and a capacitor provided in the second current path.

[0010] Any combination of the above components, and any transformation of the present invention into a method, device, system, recording medium, computer program, etc., are also valid aspects of the present invention. [Effects of the Invention]

[0011] According to the present invention, an electromagnetic brake control device and an electromagnetic control device having a simple configuration can be provided. [Brief explanation of the drawings]

[0012] [Figure 1] 1 shows a schematic configuration of a motor device including an electromagnetic brake control device. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description and drawings, identical or equivalent components, members, and processes are designated by the same reference numerals, and redundant explanations will be omitted as appropriate. The dimensions and shapes of each part shown in the drawings are set for convenience to facilitate explanation, and should not be interpreted as limiting unless otherwise specified. The embodiments are merely examples and do not limit the scope of the present invention in any way. All features and combinations thereof described in the embodiments are not necessarily essential to the invention.

[0014] The present invention can be applied to any electromagnetic product equipped with a coil that generates a magnetic field when current is applied. In the following embodiments, an electromagnetic brake will be described as an example of an electromagnetic product, but the application of the present invention is not limited to electromagnetic brakes. For example, the present invention can be applied to electromagnetic products equipped with a transformer consisting of a pair of coils as disclosed in Patent Document 1, and DC motors that obtain rotational power from a magnetic field generated by a coil through which direct current flows. As will be understood from the description of the following embodiments, it is preferable that the current flowing through the coil of the electromagnetic product be unidirectional, i.e., direct current.

[0015] 1 shows a schematic configuration of a motor device 10 including an electromagnetic control device or an electromagnetic brake control device of the present invention. The motor device 10 includes a converter 11 as a main rectifier that rectifies polyphase AC, which is supplied from an AC power source (not shown) and has different phases from one another, into DC, a smoothing capacitor 12 that smooths the DC rectified by converter 11 to form a shaped waveform, an inverter 13 that converts the DC smoothed by smoothing capacitor 12 into AC and supplies it to a motor 20 as a load, an electromagnetic brake control device 14 that controls an electromagnetic brake 30 that brakes the motor 20, and a power regeneration converter 15 as a power regeneration unit that returns regenerative power from the motor 20 and excess power stored in smoothing capacitor 12 to the AC power source.

[0016] Converter 11 includes diodes 111 to 116 that rectify three-phase (R, S, T) AC input from an AC power source in a fixed direction (from bottom to top in the figure). Diode 111 passes current when the R-phase AC voltage is positive, diode 112 passes current when the R-phase AC voltage is negative, diode 113 passes current when the S-phase AC voltage is positive, diode 114 passes current when the S-phase AC voltage is negative, diode 115 passes current when the T-phase AC voltage is positive, and diode 116 passes current when the T-phase AC voltage is negative. These bridge-shaped diodes 111 to 116 cause a pulsating current with a fixed direction but varying magnitude to appear between high-potential output terminal 117 and low-potential output terminal 118 of converter 11.

[0017] A smoothing capacitor 12 connected between the high potential output terminal 117 and the low potential output terminal 118 of the converter 11 smoothes the pulsating current obtained by the converter 11 to generate a direct current with a regular waveform. The direct current smoothed by the smoothing capacitor 12 is input between the high potential input terminal 131 and the low potential input terminal 132 of the inverter 13. Hereinafter, the high potential input to the high potential input terminal 131 is referred to as V dd , the low potential input to the low potential input terminal 132 is V ss At this time, the DC voltage input to the inverter 13 is expressed as V in Then, V in =V dd-V ss is.

[0018] The inverter 13 receives a DC voltage V between a high potential input terminal 131 and a low potential input terminal 132. in is converted into three-phase AC voltages U, V, and W. Specifically, the DC voltage V in a U-phase inverter 13U that generates a U-phase AC voltage based on in a V-phase inverter 13V that generates a V-phase AC voltage based on in A W-phase inverter 13W that generates a W-phase AC voltage based on the inverter 13U is provided in parallel. Since the inverters 13U, 13V, and 13W of each phase have a common configuration, they will be collectively referred to as inverter 13 below as appropriate.

[0019] Each inverter 13 is connected to a high DC potential V dd and a high-potential input terminal 131 to which a low DC potential V ss and a low potential input terminal 132 to which V is input, which is provided between the high potential input terminal 131 and the low potential input terminal 132. dd and V ss and an output terminal 133 that outputs an AC voltage that fluctuates between a high potential input terminal 131 and a low potential transistor 134L. A high potential transistor 134H is connected between the high potential input terminal 131 and the output terminal 133, and a low potential transistor 134L is connected between the low potential input terminal 132 and the output terminal 133. The high potential transistor 134H has its conduction state switched in response to a control signal from a high potential driver (not shown) connected to its control electrode. The low potential transistor 134L has its conduction state switched in response to a control signal from a low potential driver (not shown) connected to its control electrode.

[0020] Specifically, the driver pair consisting of the high-potential driver and the low-potential driver performs switching control to complementarily switch the conductive state of the transistor pair 134 consisting of the high-potential transistor 134H and the low-potential transistor 134L, thereby generating a DC voltage V inHere, "complementarily switching" means that when one of the transistors 134H and 134L is on, the other is off. That is, when the transistor 134H is on, the transistor 134L is off, and when the transistor 134L is on, the transistor 134H is off. As a result, when the high-potential transistor 134H is on, a high potential V is applied to the output terminal 133. dd appears, and when the low-potential transistor 134L is on, the low potential V ss By periodically repeating this switching control, a high potential V appears at the output terminal 133. dd and low potential V ss appear alternately, generating an AC voltage.

[0021] The three-phase AC voltage generated by inverter 13 is used to drive motor 20 as a load. Motor 20 is a three-phase brushless motor having coils (not shown) for three phases: U-phase, V-phase, and W-phase. A U-phase voltage from U-phase inverter 13U is applied to the U-phase coil, causing a U-phase current to flow; a V-phase voltage from V-phase inverter 13V is applied to the V-phase coil, causing a V-phase current to flow; and a W-phase voltage from W-phase inverter 13W is applied to the W-phase coil, causing a W-phase current to flow.

[0022] The inverters 13U, 13V, and 13W for each phase generate a rotating magnetic field by applying AC voltages of different phases to the coils of each phase based on the rotational position of the rotor detected by a Hall element (not shown) of the motor 20. The rotor rotates due to this rotating magnetic field, and the desired rotational power is obtained. Note that the motor 20 may be any other type of motor driven by an AC voltage. The number of phases of the motor 20 is not limited to three and may be any natural number. Similarly, the number of phases of the AC supplied from the AC power source to the converter 11 is not limited to three and may be any natural number.

[0023] The electromagnetic brake control device 14 controls the electromagnetic brake 30, which brakes the motor 20. The electromagnetic brake 30 is a de-energized brake that operates when the coil 31 is de-energized or de-energized, with no current I flowing through it. When the coil 31 is de-energized, the rotor of the motor 20 is pressed against the plate by the armature biased by a spring, resulting in a brake-activated state in which rotation of the motor 20 is restricted. On the other hand, when the coil 31 is energized or excited, with current I flowing through it, the armature, attracted against the biasing force of the spring by the coil 31, moves away from the rotor of the motor 20, resulting in a brake-released state in which rotation of the motor 20 is permitted.

[0024] In this type of non-excitation actuation type electromagnetic brake 30, the brake operates when de-energized, safely and reliably holding a moving part such as a rotor stationary. While the electromagnetic brake 30 will be described below as a non-excitation actuation type, the present invention can also be applied to an excitation actuation type electromagnetic brake. In the excitation actuation type, the brake is activated when the coil is energized or excited, and is released when the coil is de-energized or de-energized.

[0025] The electromagnetic brake control device 14 includes a rectifier 141 that rectifies AC from an AC power source into DC and supplies the DC to the coil 31 of the electromagnetic brake 30, and a low-potential V ss a transistor 142 as a control element provided in a first current path (indicated by an arrow of a current I1) toward the low-potential output terminal 118 of the converter 11; a pulse width modulation unit 143 that controls the switching of the transistor 142 by pulse width modulation (PWM); dd The converter 11 further includes a diode 144 provided in the forward direction on a second current path (indicated by an arrow of a current I2) leading to the high potential output terminal 117 of the converter 11.

[0026] The rectifier 141 includes a plurality of diodes 141R, 141S, and 141T that individually rectify the AC currents R, S, and T of each phase and supply them to the coil 31 of the electromagnetic brake 30. The input of each of the diodes 141R, 141S, and 141T is connected to the AC supply terminals R, S, and T of each phase of the AC power supply, and the output of each of the diodes 141R, 141S, and 141T is connected to the input terminal (left end in FIG. 1) of the coil 31. Each of the diodes 141R, 141S, and 141T passes a current when the input AC voltage of each of the phases R, S, and T is positive. Because the AC voltage of at least one of the phases R, S, and T is positive at any given time while the motor device 10 and the AC power supply are operating, a current I always flows through the coil 31 in a fixed direction (from left to right in FIG. 1). In this way, while the motor device 10 and AC power supply are operating, the coil 31 is always in an excited state and the electromagnetic brake 30 is in a released state, so that the motor 20 can be rotated normally.

[0027] As shown in the figure, rectifier 141 is provided in parallel with converter 11, which serves as the main rectifier. Rectifier 141 has the same function as converter 11, that is, rectifying polyphase AC supplied from an AC power source and converting it to DC, but can be configured more simply than converter 11, which consists of six diodes 111 to 116. The output of rectifier 141, which consists of three diodes 141R, 141S, and 141T, exhibits a pulsating current with greater fluctuations than the output of converter 11. However, since a current I greater than or equal to a certain level needs to flow through coil 31 to maintain the electromagnetic brake 30 in a released state, the fluctuations do not pose a major problem. Furthermore, like smoothing capacitor 12, coil 31 itself has the function of smoothing the pulsating current and suppressing fluctuations.

[0028] A low potential V ssA transistor 142 provided in a first current path branching off to the left controls the first current path between a conductive state and a non-conductive state. The transistor 142 typically takes two states, on and off, and when the transistor 142 is on, the first current path is in a conductive state, and when the transistor 142 is off, the first current path is in a non-conductive state. The transistor 142 is, for example, an insulated gate bipolar transistor (IGBT), but may also be other types of transistors such as a metal-oxide-semiconductor field-effect transistor (MOSFET) or a bipolar transistor.

[0029] Pulse width modulation unit 143 controls the on / off of transistor 142 by changing the width or duty ratio of the pulse wave. If the period of the pulse wave is T and the variable width of the pulse wave in period T is τ, the duty ratio is expressed as τ / T. During time τ when a pulse wave is present in period T, transistor 142 is in the on state, and during time T-τ when a pulse wave is not present in period T, transistor 142 is in the off state.

[0030] Hereinafter, a state in which the duty ratio is 0 will be referred to as the PWM off state, and a state in which the duty ratio is greater than 0 will be referred to as the PWM on state. In the PWM off state, the transistor 142 is always in the off state, so that the current I1 does not flow through the first current path. In the PWM on state, the pulse wave supplied from the pulse width modulation unit 143 causes the transistor 142 to be in the on state intermittently (continuously only when the duty ratio is 1), so that the current I1 flows intermittently through the first current path. As will be described later, the pulse width modulation unit 143 efficiently switches between the magnetized state and the demagnetized state of the electromagnetic brake 30 by switching between the PWM on state and the PWM off state.

[0031] A high potential V is applied from the branch point 145 on the output side of the coil 31. ddA diode 144 provided in the forward direction in a second current path branching off to the side causes a current I2 from the coil 31 to flow in the second current path when the transistor 142 is in the off state, i.e., when the current I1 does not flow in the first current path. As will be described later, the current I2 is used to charge the smoothing capacitor 12 provided in the second current path, and if the smoothing capacitor 12 becomes overcharged, excess power is returned to the power regeneration converter 15.

[0032] Power regeneration converter 15 is provided in parallel with smoothing capacitor 12 and returns regenerative power from motor 20 and excess power stored in smoothing capacitor 12 via the second current path to the AC power supply. Specifically, when the voltage of smoothing capacitor 12 increases due to regenerative power from motor 20 or charging via the second current path and becomes higher than the output voltage of converter 11, power regeneration converter 15 returns the excess power stored in smoothing capacitor 12 to AC supply terminals R, S, and T of each phase of the AC power supply. Power regeneration converter 15 can be configured arbitrarily based on known technology, but as a simple example configuration, a resistor connected in parallel with smoothing capacitor 12 may be used to convert the excess power stored in smoothing capacitor 12 into heat to prevent overcharging.

[0033] Next, a description will be given of the control of the electromagnetic brake 30 by the electromagnetic brake control device 14. Specifically, a pulse width modulation unit 143 serving as a mode switching unit in the electromagnetic brake control device 14 switches between an excitation mode in which the transistor 142 switches the first current path to a conductive state to excite the coil 31 of the electromagnetic brake 30 while the motor device 10 and the AC power supply are operating, and a demagnetization mode in which the transistor 142 switches the first current path to a non-conductive state while the motor device 10 or the AC power supply is not operating, to demagnetize the coil 31 of the electromagnetic brake 30 by charging the smoothing capacitor 12 via the second current path.

[0034] In the excitation mode, the pulse width modulation unit 143 maintains the excited state of the coil 31 of the electromagnetic brake 30 while switching the first current path between a conductive state and a non-conductive state using the transistor 142. In other words, in the excitation mode, the pulse width modulation unit 143 operates in a PWM-on state in which it applies to the transistor 142 a pulse wave whose width τ (≦period T) or duty ratio τ / T (≦1) is greater than 0.

[0035] During τ (greater than 0 and equal to or less than T) when the pulse wave turns on the transistor 142, the current I from the coil 31 flows through the first current path via the transistor 142. On the other hand, during T-τ (greater than 0 and less than T) when there is no pulse wave and the transistor 142 is off, the current I from the coil 31 flows through the second current path via the diode 144 due to the back electromotive force generated in the coil 31.

[0036] Thus, in the excitation mode, the current path on the output side of the coil 31 frequently switches between the first current path (I1) and the second current path (I2) in response to the transistor 142 being on / off controlled at a frequency of cycle T. However, a current I above a certain level continues to flow through the coil 31, so the electromagnetic brake 30 is maintained in an excited state, i.e., a brake-released state. Here, the smoothing capacitor 12 can be charged via the second current path by the back electromotive force generated in the coil 31 when the transistor 142 switches from the on state to the off state, thereby reducing the power consumption of the motor device 10. According to this embodiment, the coil 31 can be energized and the smoothing capacitor 12 can be charged by the back electromotive force using a single transistor 142, thereby simplifying the configuration compared to Patent Document 1, which requires two switches (S1, S2).

[0037] Except when the duty ratio is 1, where the pulse wave width τ is equal to the period T, the electromagnetic brake control device 14 operating in the excitation mode continues to charge the smoothing capacitor 12 via the second current path. Therefore, there is a possibility that the smoothing capacitor 12 may be overcharged during the excitation mode, i.e., while the motor device 10 and the AC power supply are operating.

[0038] However, according to this embodiment, the power regeneration converter 15 returns excess power stored in the smoothing capacitor 12 to the AC power supply, preventing overcharging of the smoothing capacitor 12 and enabling the excess power to be reused effectively. As described above, according to this embodiment, the power regeneration converter 15, which is originally provided in many motor devices 10 for the purpose of recovering regenerative power from the motor 20, can also be used as is for recovering excess power supplied from the electromagnetic brake 30 via the second current path. Therefore, according to this embodiment, the number of additional components (such as the rectifier 141) can be minimized, allowing the motor device 10 to be configured simply.

[0039] In the demagnetization mode, the pulse width modulation unit 143 switches the first current path to a non-conducting state using the transistor 142, thereby rapidly demagnetizing the coil 31 of the electromagnetic brake 30. In other words, in the demagnetization mode, the pulse width modulation unit 143 operates or stops in a PWM-off state in which the pulse wave width τ or duty ratio τ / T is 0. Note that demagnetization is also sometimes called arc extinction.

[0040] The following describes the case where the motor device 10 or AC power supply, which has been operating in excitation mode, stops and switches to demagnetization mode. In excitation mode, as described above, a certain level of current I continues to flow through the coil 31 of the electromagnetic brake 30. However, when the motor device 10 or AC power supply stops and switches to demagnetization mode, the current supply from the rectifier 141 to the coil 31 is cut off, and a large back electromotive force that resists the sudden change in current is generated in the coil 31. At the same time, the pulse width modulation unit 143 transitions to the PWM off state, so the transistor 142 is constantly off and the first current path is constantly non-conductive.

[0041] As described above, in the degauss mode, a state occurs in which no current can flow through the first current path, and a large current caused by a large back electromotive force generated in coil 31 flows into smoothing capacitor 12 on the second current path via diode 144. At this time, a large voltage difference occurs between the smoothing capacitor 12 side (the right side of converter 11 in FIG. 1) that is rapidly charged by the back electromotive force of coil 31 and the AC power supply side (the left side of converter 11 in FIG. 1) where the supply of AC voltage has been cut off due to the stoppage of motor device 10 or the AC power supply, and therefore power regeneration converter 15 rapidly discharges the power stored in smoothing capacitor 12 to the AC power supply side.

[0042] As described above, when the motor device 10 or the AC power supply is stopped and the mode is switched from the excitation mode to the demagnetization mode, the large back electromotive force generated in the coil 31 rapidly charges the smoothing capacitor 12 via the second current path, and at the same time, the power regeneration converter 15 rapidly discharges the power stored in the smoothing capacitor 12 to the AC power supply side. This rapidly reduces the current and magnetic flux in the coil 31 of the electromagnetic brake 30, allowing for a rapid transition from the excited state to the demagnetized state. In other words, the electromagnetic brake 30 can be rapidly transitioned from the brake released state (excited state) to the brake applied state (demagnetized state) in response to the stop of the motor device 10 or the AC power supply, allowing the motor 20 to be stopped safely and quickly.

[0043] The present invention has been described above based on the embodiments. The embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of the respective components and treatment processes, and that such modifications are also within the scope of the present invention.

[0044] The functional configuration of each device described in the embodiments can be realized by hardware resources, software resources, or a combination of hardware and software resources. Examples of hardware resources include processors, ROMs, RAMs, and other LSIs. Examples of software resources include operating systems, applications, and other programs. [Industrial Applicability]

[0045] The present invention relates to a control technology for electromagnetic products such as electromagnetic brakes equipped with coils. [Explanation of symbols]

[0046] 10 motor device, 11 converter, 12 smoothing capacitor, 13 inverter, 14 electromagnetic brake control device, 15 power regeneration converter, 20 motor, 30 electromagnetic brake, 31 coil, 141 rectifier, 142 transistor, 143 pulse width modulation section, 144 diode, 145 branch point.

Claims

1. a first current path and a second current path branching from a coil of the electromagnetic brake; a control element provided in the first current path and controlling the first current path between a conductive state and a non-conductive state; a capacitor provided in the second current path; Equipped with Further, a rectifier unit is provided which rectifies AC power from an AC power supply into DC power and supplies the DC power to the coil, an electromagnetic brake control device further comprising a main rectifier provided in parallel with the rectifier for rectifying AC from the AC power supply into DC and supplying the DC to the capacitor;

2. the AC power source supplies polyphase AC; The rectifier unit includes a plurality of diodes that individually rectify the AC current of each phase and supply the rectified AC current to the coil.

2. The electromagnetic brake control device according to claim 1.

3. an inverter that converts the direct current from the capacitor into alternating current and supplies the alternating current to a load; a power regeneration unit provided in parallel with the capacitor, which returns regenerated power from the load and power stored in the capacitor via the second current path to the AC power supply; The electromagnetic brake control device according to claim 1 , further comprising:

4. an excitation mode in which the control element switches the first current path to a conductive state to excite the coil; a demagnetization mode in which the control element switches the first current path to a non-conductive state to demagnetize the coil by charging the capacitor through the second current path; The mode switching unit may further include a mode switching unit capable of switching between the 4. The electromagnetic brake control device according to claim 1.

5. 5. The electromagnetic brake control device according to claim 4, wherein in the excitation mode, the control element switches the first current path between a conductive state and a non-conductive state while maintaining the coil in an excited state.

6. 1. A method for controlling an electromagnetic brake in which a first current path including a control element and a second current path including a capacitor branch off from a coil, the method comprising: an excitation step of switching the first current path to a conductive state by the control element to excite the coil; a demagnetizing step of switching the first current path to a non-conducting state by the control element to demagnetize the coil by charging the capacitor through the second current path; Equipped with a rectification step of rectifying AC from an AC power supply into DC by a rectification unit and supplying the DC to the coil; an electromagnetic brake control method further comprising a main rectification step of rectifying AC from the AC power supply into DC by a main rectification unit provided in parallel with the rectification unit and supplying the DC to the capacitor;

7. 7. The electromagnetic brake control method according to claim 6, wherein in the exciting step, the excited state of the coil is maintained while the control element switches the first current path between a conductive state and a non-conductive state.

8. A control program for an electromagnetic brake in which a first current path including a control element and a second current path including a capacitor branch off from a coil, the program comprising: an excitation step of switching the first current path to a conductive state by the control element to excite the coil; a demagnetizing step of switching the first current path to a non-conducting state by the control element to demagnetize the coil by charging the capacitor through the second current path; on the computer, further causing the computer to execute a rectification step of rectifying AC from an AC power supply into DC and supplying the DC to the coil by a rectification unit; an electromagnetic brake control program that causes the computer to further execute a main rectification step of rectifying AC from the AC power supply into DC using a main rectification unit provided in parallel with the rectification unit and supplying the DC to the capacitor;

9. a first current path and a second current path branching from a coil through which a current flows in a fixed direction; a control element provided in the first current path and controlling the first current path between a conductive state and a non-conductive state; a capacitor provided in the second current path; Equipped with Further, a rectifier unit is provided which rectifies AC power from an AC power supply into DC power and supplies the DC power to the coil, The electromagnetic control device further includes a main rectifier section provided in parallel with the rectifier section, which rectifies AC from the AC power supply into DC and supplies the DC to the capacitor.

Images