JP2003250286A - Controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller comprising a hybrid circuit which is smaller and operates surely. <P>SOLUTION: A controller 100 comprises a brake resistor 22, a semiconductor switching circuit 23, an electromagnetic switch 26 provided with a normally- closed contact 24 and an excitation coil 25, a hybrid circuit 35 where the semiconductor switching circuit 23 is connected parallel to the normally-closed contact 24, a switching part 40 where the hybrid circuit 35 is connected to both ends of the power line of a motor 50, and a control unit 30 which outputs a second control signal 15 for controlling excitation of the excitation coil 25 which actuates the normally-closed contact 24 and a first control signal 14 that switching-controls the current flowing the semiconductor switching circuit 23. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device having a hybrid circuit section composed of two types of dynamic brake circuits.

[0002]

2. Description of the Related Art Conventionally, there is a control device having a dynamic brake for electrically braking a motor. The principle of dynamic braking is that the circuit supplying the current for rotating the rotor of the motor is electrically cut off to stop the supply of the current to the motor, and then another closed circuit including the motor is created. As described above, the rotational energy stored in the motor is converted into electric energy, that is,
By operating the motor as a generator, the internal resistance of the motor and the braking resistance provided outside the motor are consumed as thermal energy to brake and stop the rotation of the rotor of the motor.

As a method of forming a closed circuit including the above-mentioned motor, a method of using a normally closed contact of an electromagnetic switch, and an insulated gate bipolar transistor (IGBT: The Insulated Ga) are used.
There is a method using a semiconductor element called te Bipolar Transistor), but each method has the following advantages and disadvantages.

A braking circuit using an electromagnetic switch has a simple circuit structure, and even if the control power supply is cut off, the contact is mechanically closed by using a normally closed contact, so that the braking circuit is While it has the advantage of operating more reliably, it is necessary to use an electromagnetic switch with a large contact capacity in order to operate reliably for a long period of time, considering the wear of the contact due to the arc discharge current and the inrush current to the contact. There is
The electromagnetic switch also has the disadvantage of being large. Further, even if the electromagnetic switch is made large, there is a disadvantage that the contacts may be worn or burned for a long time.

Further, when an IGBT circuit including an IGBT, a transistor, a diode, a resistor and a capacitor is used, the circuit is more complicated than the case where an electromagnetic switch is used, and moreover, it is composed of an electric circuit using a semiconductor element. Therefore, if the control power is cut off, the braking circuit does not work. On the other hand, IGBT
Since the switching by the circuit is the switching operation by the semiconductor element, contactless switching can be performed.
Therefore, no arc discharge current is generated. Moreover, since the switching is performed instantaneously, the energy of the inrush current can be reduced. That is, when the IGBT circuit is used, there is an advantage that a braking circuit that is not affected by the arc discharge current or the inrush current can be realized except for the above-mentioned disadvantages.

[0006]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention
Both of them have the above-mentioned disadvantages, and it is problematic to use them as they are.

The present invention is intended to solve the above problems, and an object thereof is to provide a hybrid circuit composed of two types of dynamic brake circuits. By controlling the hybrid circuit, the size is small and maintenance is possible. Free and
An object of the present invention is to provide a control device in which the dynamic brake circuit operates more reliably even if the control power supply is cut off.

[0008]

In order to solve the above-mentioned problems, a first aspect of the present invention relates to a drive section for controlling a current for rotationally driving a rotor of a motor, and the drive section of the drive section. In a control device having a switching unit having a switch for energizing or de-energizing the motor, in the switching unit, an electromagnetic switch and a semiconductor switching circuit are provided, and a normally-closed contact of the electromagnetic switch is provided. A hybrid circuit unit to which the semiconductor switching circuit is connected, and a control unit that sequentially operates the semiconductor switching circuit and the electromagnetic switch to generate a control signal for controlling the rotation of the rotor to stop are provided.

A second invention according to the present invention is, in order to solve the above-mentioned problem, an insulated gate bipolar transistor (hereinafter referred to as an IGBT) in the semiconductor switching circuit.
That is, an IGBT circuit including a transistor, a diode and a passive element is used.

In order to solve the above problems, a third aspect of the present invention includes a braking resistor, and the braking resistor is inserted between the hybrid circuit section and the power line of the motor. The braking resistor is connected to the outside of the motor.

[0011]

A control signal is applied to the semiconductor switching circuit to perform a switching operation so that the electric energy stored in the motor is energized. Next, the excitation coil of the electromagnetic switch is deenergized by another control signal, and the normally closed contact is closed.
The closed normally closed contact is energized in parallel with the semiconductor switching circuit. First, since the semiconductor switching circuit is energized, the normally closed contacts are closed with no potential difference between the normally closed contacts. Therefore, the normally closed contact has
No arc discharge current and no inrush current. Moreover, since the current is shunted to the semiconductor switching circuit and the normally closed contact, the current flowing to the contact of the electromagnetic switch is reduced. Therefore, the contact capacity of the normally closed contact can be reduced accordingly, and a small electromagnetic switch can be used.

[0012]

1 is a diagram showing an embodiment according to the present invention. As shown in FIG. 1, the control device 100 of the present invention includes a drive unit 11, a control unit 30, and a switching unit 40. The drive unit 11 controls the current I1 for rotationally driving the rotor of the motor 50 and supplies the current I1 to the motor 50.
An example of the drive unit 11 is an inverter circuit. Control unit
The switch 30 inputs the switching signal 13 to the switch 27 that turns on / off the current I1 supplied from the drive unit 11 to the motor 50. The control unit 30 also generates first and second control signals 14 and 15 for controlling the operations of the semiconductor switching circuit 23 and the electromagnetic switch 26 described later. The switching unit 40 has a switch
In addition to 27, semiconductor switching circuit 23 and electromagnetic switch
There is a hybrid circuit section 35 consisting of 26. The semiconductor switching circuit 23 is an IGBT (The Insulated Gate Bipolar Transistor).
istor: insulated gate bipolar transistor), a circuit composed of transistors, diodes, passive elements (resistors and capacitors), etc. (not shown).

The semiconductor switching circuit 23 includes a motor 50
In order to switch the function of the generator to the function of the generator and consume the energy accumulated in the motor 50 by the internal resistance (not shown) of the motor 50 and the braking resistance 22 outside the motor 50, the first control signal 14 Is entered. First control signal
When 14 is input, the current I2
Flows.

The electromagnetic switch 26 comprises a normally closed contact 24 and an exciting coil 25 for opening and closing the normally closed contact 24. The second control signal 15 generated by the control unit 30 is input to the exciting coil 25 of the electromagnetic switch 26, similarly to the semiconductor switching circuit 23. The normally-closed contact 24 is a contact that closes when the excitation of the exciting coil 25 is cut off. Therefore, when the second control signal 15 is input so that the excitation of the exciting coil 25 is cut off, the normally-closed contact 24 receives the current I3. Flows.

A circuit in which the semiconductor switching circuit 23 and the normally closed contact 24 are connected in parallel is connected in parallel with the motor 50 and the drive unit 11. When braking the motor 50, first, the switch 27 shuts off the current from the drive unit 11, and then the semiconductor switching circuit 23 and the normally closed contact 24 are sequentially closed to flow the generated current through the internal resistance of the motor 50. The braking energy is stopped by consuming the rotational energy stored in.

To shut off the current I1 of the switch 27 and sequentially close the semiconductor switching circuit 23 and the normally-closed contact 24, the control unit 30 controls the switching signal 13, the first and second control signals 14, 15 to be supplied.
Is generated and sequentially input to the switch 27, the semiconductor switching circuit 23, and the exciting coil 25. Since the semiconductor switching circuit 23 is closed first, the rush current and the arc discharge current to the normally closed contact 24 do not occur when the normally closed contact 24 is next closed. Therefore, wear of the normally closed contact 24 is prevented. As a result, the capacity of the electromagnetic switch 26 used can be further reduced, the space of the control device 100 having a plurality of the switches can be reduced, and the control device 100 can be made smaller.

In FIG. 1, the braking resistor 22 is shown by a broken line. In the above description, the case where the connecting points 22a and 22b are short-circuited and the braking resistor 22 is not used has been described.
This case is used in the case of the control device 100 that controls the motor 50 used in the range where the motor rotation speed is low.
When the control device 100 using the motor 50 used in the range of low speed to high speed is used, the braking resistor 22 is connected to the connection point 2.
It may be added between 2a and 22b. The addition of the braking resistor 22 enables a quicker stop.

The hybrid circuit section 35 using the electromagnetic switch 26 having the normally closed contact 24 mechanically closes the normally closed contact 24 even if the semiconductor switching circuit 23 does not operate due to cutoff of the control power supply. This ensures that the dynamic brake circuit operates.

The semiconductor switching circuit 23 may be a circuit using a semiconductor element other than the IGBT.

Although the motor 50 has been described with reference to FIG. 1, when there are a plurality of motors to be controlled, the drive unit 60, the control unit 70, the switching unit 80 and the motor shown by the dotted line in FIG.
90 configurations increase by the number of motors.

[0021]

According to the present invention, since two types of dynamic brake circuits are hybridized, no inrush current or arc discharge is generated at the contacts, and the contacts can be maintenance-free. Further, it is possible to use an electromagnetic switch having a small contact capacity, and the size of the electromagnetic switch and the control device incorporating the electromagnetic switch can be reduced. Further, even if the control power source is cut off, the normally closed contact is mechanically closed, so that the dynamic brake operates more reliably.

[Brief description of drawings]

FIG. 1 is a diagram showing a control device having a hybrid circuit section including two types of dynamic brake circuits according to the present invention.

[Explanation of symbols] 11,60 Drive 13 Switching signal 14 First control signal 15 Second control signal 22 Braking resistance 22a, 22b connection point 23 Semiconductor switching circuit 24 Normally closed contact 25 Excitation coil 26 Electromagnetic switch 27 switch 30, 70 Control unit 35 hybrid circuit 40, 80 switching section 50, 90 motor 100 control unit

Claims (3)

[Claims] 1. A drive unit for controlling a current for rotationally driving a rotor of a motor, and a switching unit having a switch for energizing or de-energizing the motor with the current of the drive unit. In the control device, an electromagnetic switch and a semiconductor switching circuit are provided in the switching unit, a normally closed contact of the electromagnetic switch and a hybrid circuit unit in which the semiconductor switching circuit is connected, the semiconductor switching circuit and the electromagnetic switch. And a control unit for generating a control signal for controlling to stop the rotation of the rotor by sequentially operating the control unit. 2. The semiconductor switching circuit includes an insulated gate bipolar transistor (hereinafter referred to as IGBT),
IG consisting of transistor, diode and passive element
The control device according to claim 1, wherein a BT circuit is used. 3. A braking resistor is provided, the braking resistor is inserted between the hybrid circuit section and a power line of the motor, and the braking resistor is connected to the outside of the motor. And the control device described in 2.