JPH047672Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a power supply device that is applied to high reactor loads such as electromagnetic brakes, and is particularly concerned with a DC brake power supply that rises quickly at startup and discharges quickly when stopped. It is related to the device.

“Conventional Technology” The conventional DC electromagnetic brake power supply device 20 has a fourth
In the one shown in Figure 4, the anode of the rectifier diode 21 is connected to the input terminal RA, the cathode of the diode 21 is connected to the cathode of the flywheel diode 22 and the output terminal P, and the anode of the diode 22 is connected to the cathode of the flywheel diode 22 and the output terminal P. is connected to the input terminal SA and the output terminal N via the discharge resistor 23, and the input terminal
Connect RA and SA to the R phase and S phase of the three-phase AC power supply voltage through contacts 15 and 15 of a magnetic contactor, respectively, and connect the contact 15 of the magnetic contactor in parallel with the discharge resistor 23 between terminals SA and N. output terminal P,
A DC electromagnetic brake coil 16 is connected to N. In the DC electromagnetic brake power supply device 20,
Operation coil of contact 15 of the electromagnetic contactor (not shown)
When excited, the contact 15 is turned on, power supply voltage is applied to the input terminals RA and SA, terminals SA and N at both ends of the discharge resistor 23 are short-circuited, and the DC electromagnetic brake coil 16 is Flywheel diode 2 in the steady mode equivalent circuit diagram shown in
The same voltage as the voltage applied to the single-phase half-wave rectifier circuit with 2 is input. When the electromagnetic contactor contact 15 is turned off, the electromagnetic energy accumulated in the DC electromagnetic brake coil 16 is transferred to the terminal P, the brake coil 16, and the terminal N via the terminal N, the discharge resistor 23, and the flywheel diode 22. In the stop mode discharge equivalent circuit shown in FIG.

"Problems to be solved by the invention" In the DC electromagnetic brake power supply device 20 shown in FIG.
Because the current flowing through the DC electromagnetic brake coil 16 rises slowly, the operation of the electromagnetic brake is delayed.
For example, when used in an electric motor with a brake,
During the brake release delay time, excessive current flows through the motor, and when frequent opening/closing operations are performed, the temperature of the motor increases rapidly, and the motor side rotates before the brake side is fully released, resulting in friction with the brake drum. , there is a problem in that the brake lining is severely worn and the electromagnetic brake itself heats up.

"Means for Solving the Problems" The present invention was devised to solve the above problems, and will be explained below using FIGS. 1 and 2, which correspond to embodiments.

As shown in Figure 1, the R phase and S phase of a three-phase AC power supply
The input terminals RA, SA, and DC brake power supply device 14 are connected to the input terminals RA, SA,
TA, the anode of the rectifier diode 1 is connected to the terminal TA, the cathode of the rectifier diode 3 is connected to the terminal RA, the cathode of the rectifier diode 2 is connected to the cathode of the diode 1, and the anode of the thyristor 4 is connected to the anode of the diode 2. The anode of the diode 3 is connected to the cathode and the anode of the thyristor 4, respectively, and the common connection point 5 of the series-connected diode 2 and thyristor 4 is connected to the terminal SA to form a three-phase modified mixed bridge circuit (rectifier circuit) 6, The anode of diode 7 is connected to the anode of diode 1, and the cathode of diode 7 is connected in series with a resistor 8 for setting thyristor gate firing time and a capacitor 9, connected to the gate of thyristor 4, and connected in parallel with capacitor 9. A resistor 10 for discharging electrostatic energy is interposed between the thyristor gate ignition circuit 11 at the time of starting, the cathode of the flywheel diode 12 is connected to the cathode of the diodes 1 and 2, and the discharge resistor 13 is connected to the anode of the diode 3 and the thyristor 4.
connect the anode of the diode 12 via
Both ends of the series-connected diode 12 and discharge resistor 13 are connected to the output terminal P of the DC brake power supply device 14,
A DC electromagnetic brake coil 16 is connected to the terminals P and N in parallel with the diode 12 and the discharge resistor 13.

"Operation" When the operating coil (not shown) of the contact 15 of the electromagnetic contactor is excited, the contact 15 is turned on, and three-phase AC power supply voltage is applied to the terminals RA, SA, and TA of the DC brake power supply device 14. . At this time, the diode 7 of the thyristor gate ignition circuit 11 at the time of starting,
A charging current flows through the gate and cathode of the cyristor 4 via the resistor 8 and capacitor 9, and the current flows to the gate of the thyristor 4 for a time determined by the time constant of the resistor 8 and capacitor 9, turning on the thyristor 4 during this period. Since it has the same function as the starting mode equivalent circuit diagram in Figure 2A, the output terminals P and N
In between, the voltage waveform shown in FIG. 3A is applied. Since this output voltage is the same average voltage as that of the single-phase full-wave rectifier circuit, the output voltage is twice that of the single-phase half-wave rectifier circuit shown in FIG. 5A. This mode becomes the starting mode.

Moreover, when the charging of the capacitor 9 of the thyristor gate ignition circuit 11 at the time of starting is completed, the thyristor 4
Current no longer flows through the gate of thyristor 4.
is turned off and has the same function as the steady mode equivalent circuit diagram in Fig. 2B, and the voltage in Fig. 3B is applied between the output terminals P and N, and the voltage becomes negative as shown in Fig. 3B. During this period, a voltage as shown in FIG. 3B is constantly applied to the discharge resistor 13. This mode becomes the steady mode.

Furthermore, when the contact 15 of the electromagnetic contactor is turned off, the electromagnetic energy accumulated in the DC electromagnetic brake coil 16 is transferred from the terminal N to the discharge resistor 13, to the flywheel diode 12, to the terminal P, to the DC electromagnetic brake coil 16, and from the terminal N. Discharge is caused by the discharge resistor 13 in the stop mode discharge equivalent circuit diagram of FIG. 2C and the internal resistance of the DC electromagnetic brake coil 16 in a closed loop. This mode becomes stop mode.

As described above, by controlling the gate of the thyristor 4 inserted into the three-phase deformable mixed bridge circuit 6, it is possible to separate it into three modes: starting mode, steady mode, and stop mode, which speeds up the rise of the starting current. , it becomes possible to speed up the release of the DC electromagnetic brake.

``Example'' Now, the accompanying drawings showing an example of implementing the present invention will be described in detail.

1 is a rectifier diode whose anode is connected to an input terminal TA, and whose cathode is connected to the cathode of a rectifier diode 2. 3 is a rectifier diode whose cathode is connected to the input terminal RA. A thyristor 4 has its cathode connected in series with the anode of the diode 2, its common connection point 5 connected to the input terminal SA, and the anodes of the diode 3 and the thyristor 4 connected respectively. 6 is a three-phase modified mixed bridge circuit, with diodes 1, 2, and 3 connected as described above.
This is a rectifier circuit composed of a thyristor 4 and a thyristor 4.
Reference numeral 11 designates a thyristor gate ignition circuit at the time of starting, in which a rectifier diode 7 whose anode is connected to the anode of the diode 1, and a resistor 7 and a capacitor 9 for setting the thyristor gate ignition time are connected in series to the cathode of the diode 7. A resistor 10 for electrostatic energy discharging of the capacitor 9 and a gate protection resistor 17 of the thyristor 4 are connected in series and interposed in parallel with the capacitor 9, and a common connection point 18 of the resistors 10 and 17 is connected to the gate of the capacitor 4. is connected to the terminal SA, and the anode of a rectifier diode 19 is connected to the common connection point 18, and its cathode is connected to the gate of the thyristor 4, respectively. 12 is a flywheel diode whose cathode is connected to the cathodes of the diodes 1 and 2 and the output terminal P, and whose anode is connected to the anode of the diode 3 and thyristor 4 and the output terminal N via a discharge resistor 13. This is what I did. Reference numeral 14 denotes a DC brake power supply device, which connects the input terminals RA, SA, and TA to a series of three-phase modified mixed bridge circuits 6, a starting thyristor gate ignition circuit 11, a series-connected flywheel diode 12 and a discharge resistor 13, and an output. It consists of terminals P and N. Reference numeral 15 indicates a contact point of a conventional electromagnetic contactor, and the R, S, and T phases of the three-phase AC power supply voltage are connected to the input terminal through the contact point 15, respectively.
It connects RA, SA, and TA. Reference numeral 16 denotes a DC electromagnetic brake coil similar to the conventional one, which is connected to output terminals P and N in parallel with the flywheel diode 12 and the discharge resistor 13.

"Effects of the invention" With the above-described configuration, the present invention controls the gate of the thyristor 4 by the thyristor gate ignition circuit 11 inserted into the three-phase deformable mixed bridge circuit 6, thereby controlling the DC brake power supply 14 to the second Diagram A
As shown in ~C, the starting mode, steady mode, and stop mode can be separated, and the startup current can rise quickly, so the DC electromagnetic brake can be released quickly, and there is no brake release delay time.
Even when used in an electric motor with a brake, no overcurrent flows to the motor, and even if frequent opening/closing operations are performed,
Since the temperature rise of the electric motor is small and the electric motor rotates after the brake side is fully opened, there is little wear on the brake lining and the electromagnetic brake itself does not overheat.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the present invention, and Fig. 1 is a wiring diagram of the DC brake power supply device of the present invention;
Figure 2 is the equivalent circuit diagram, A is the one in the starting mode, B is the one in the steady mode, C is the one in the stop mode, and Figure 3 is the output waveform diagram, where A is the brake coil voltage at the time of starting, and B is the brake coil voltage during steady operation, FIG. 4 is a wiring diagram of a conventional DC electromagnetic brake power supply device, and FIG. 5 is its equivalent circuit diagram, where A is the one in the steady mode and B is the one in the stop mode. 1, 2, 3... Rectifier diode, 4... Thyristor, 5... Common connection point, 6... Three-phase modified mixed bridge circuit, 7... Rectifier diode, 8... Resistor, 9... Capacitor, 10... ... Electrostatic energy discharge resistance, 11 ... Thyristor gate ignition circuit at startup, 12 ... Diode for flywheel, 1
3...Discharge resistance, 14...DC brake power supply device, 15...Contact of electromagnetic contactor, 16...DC electromagnetic brake coil, 17...Protection resistor, 18...
Common connection point, 19... Rectifier diode, 20...
DC electromagnetic brake power supply device, 21... Rectifier diode, 22... Flywheel diode, 2
3...Discharge resistance.

Claims (1)

[Scope of utility model registration request] The anode of a rectifier diode 1 is connected to the T phase of a three-phase AC power supply, and the cathode of the same diode 3 is connected to the R phase, and the rectifier diode 2 and the thyristor 4 are connected in series, and the diode 2 and the thyristor 4 are connected in series.
The common connection point 5 of the diode 1 is connected to the S phase, and the diode 1
and the cathode of diode 2 and diode 3, respectively.
The anodes of the thyristor 4 and the thyristor 4 are connected to form a three-phase modified mixed bridge circuit 6, and the diode 1
A rectifier diode 7, a resistor 8 and a capacitor 9 are interposed in series from the anode of the thyristor 4 to the gate of the thyristor 4, and an electrostatic energy discharging resistor 10 is interposed in parallel with the capacitor 9 to form a thyristor gate ignition circuit 11 at the time of starting. A flywheel diode 12 and a discharge resistor 1 are connected between the cathodes of diodes 1 and 2 and the anodes of diode 3 and thyristor 4.
3 in series, and a DC electromagnetic brake coil 16 is connected in parallel to the diode 12 and the discharge resistor 13.