JPS62173994A - Motor drive circuit - Google Patents

Abstract

PURPOSE:To enable a motor to stop quickly by connecting damping semiconductor elements in series to semiconductor elements in a drive circuit of a motor. CONSTITUTION:When a motor drive signal 101 is '1', a transistor T1 turns ON and a DC motor M is driven. At this moment, the transistor T2 is OFF. When the motor drive signal 101 becomes '0', the transistor T1 turns OFF while the transistor T2 turns ON. The motor M itself becomes a generator, so that the counter-electromotive force is generated and the motor M stops quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive circuit for a Do motor, and more particularly to a drive circuit for a motor having a brake circuit that immediately stops the 0 motor when a stop command is given.

(Prior technology) Conventionally, the drive circuit for the motor in this inn did not have a brake circuit in particular, and even if the drive signal stopped, the motor itself became a generator, and there was nothing to remove the energy generated there. Therefore, the motor rotates during coasting and requires a certain amount of time to stop.

(Problems to be Solved by the Invention) In the conventional Do motor drive circuit described above, even if a stop signal is issued, the motor itself becomes a generator, and there is nothing to consume the energy generated by the motor. There were problems with rotation loss and time lag.

The object of the present invention is to: when the motor drive signal stops and then
An object of the present invention is to provide a motor control circuit that can quickly stop the motor.

(Means for Solving the Problems) In order to achieve the above object, a motor drive circuit according to the present invention includes a semiconductor element for driving the motor, in which the drive of the motor is stopped. Sometimes, a brake circuit is provided which includes a braking semiconductor element connected in series with the semiconductor element in order to remove the energy generated by the motor.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a motor drive circuit according to the present invention.

In Figure 1, IOl and IO2 are inverter circuits, ■
(11 to R3 are resistors, T1 is a PNPN upper type transistor, T
2 is an NPN transistor, Dl is a diode, M is D
o motor.

The connection line from the input terminal is branched, -100 is connected to the inverter circuit I01, and the other is connected to the inverter circuit IO2. The inverter circuits Lot and IO2 are open-collection output circuits. Inverter circuit I01
The output of HL'A is connected to the base of the transistor T1 via the resistor R12, and the base of the transistor 'r1 is connected to the power supply (+24V) via the resistor R3g. The transistor T1 is a PNP type transistor and is used as a driving semiconductor element.

The emitter of the transistor T1 is connected to the power supply (+24V), and the collector is connected to the motor M. A diode D1 is connected between the collector of the transistor T1 and the motor M.
It is connected to the power supply (+24V) via.

-10,000, the output of the inverter circuit I02 is the transistor T
2, and the base is further connected to the resistor R
22 to the power supply (+24V). The transistor T2 is an NPN type transistor and is used as a braking semiconductor element. Transistor T2
(7) The collector is connected to the collector of the transistor T1, and the emitter is grounded.

Next, the entire operation of the motor drive circuit according to the present invention will be explained.

First, driving the motor M will be explained with reference to FIGS. 1, 2, and 4. Motor drive signal 101
When is 11'' (Fig. 4(a)), the inverter output signal 102 becomes the ground level by the inverter circuit I01 (Fig. 4(b)).At this time, the inverter output signal 103 also becomes the ground level. (Eg
4 Figure (c)). The base input signal 104 is (Fig. 4 (
d)) According to Ohm's law, the voltage is divided by the resistor R1 and the resistor R3, which is lower than the emitter voltage, so the transistor T1 is turned on and current flows as shown in FIG. This current drives the DC motor M (FIG. 4(e)). In the transistor T2, the inverter output signal 103 is at the ground level and there is no potential difference between the emitter and the transistor T2.
FF goes into FF state.

Next, when the motor drive signal 101 becomes 0'' (
FIG. 4(a)) The inverter output signal 102 becomes open, and the base signal signal 104 becomes (i 4).
), through the resistor R3k (V), the transistor T1 is connected to the emitter with no potential difference.
It becomes like FF. In the transistor T2, the inverter output signal 103 becomes open (see Fig. 4(e)).
l) - When the base voltage becomes 24 (V) through the resistor R, 22, a potential difference occurs with the emitter, and the transistor T2 is turned on.
become a state.

When the transistor T1 is turned off, the current that had been flowing as shown in FIG. 2 stops.

At this time, the motor M itself becomes a starter and generates a back electromotive force, causing a current to flow as shown in FIG. Furthermore, when the transistor T2 is turned on, the direction of the current coincides with the current flow shown in FIG. 3, and the complete closed circuit shown in FIG. The motor M stops quickly compared to the conventional example shown in .

Note that when the back electromotive force generated in the motor M becomes larger than 24 (V), the diode D1 is connected to the transistor T1.
, 'L' 2 is provided to completely prevent the transistors Tl and T2 from being destroyed due to exceeding the withstand voltage between the emitter and collector.

As explained above, the Do motor drive circuit of the present invention turns on transistors of different shapes after all commands to stop driving the Do motor are executed.

The function of the OFF state allows the motor to be quickly stopped.

(Effects of the Invention) As explained above, the present invention is such that when the drive signal stops, the motor itself becomes a starter, and the energy generated there is consumed by closing both ends of the motor. This has the effect of being able to stop the motor at full speed.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the Do motor drive circuit according to the present invention, and FIG. 2 is a diagram showing the current flow t when the transistor T1 used in the embodiment circuit is in the on state. , FIG. 3 is a diagram showing the entire flow of current when the transistor T2 used in the same embodiment circuit is turned on, and FIG. 4 is a diagram showing the trough of the same embodiment circuit when the drive signal changes. FIG. 3 is a timing diagram showing signals and current values. Iol, IO2... Inverter circuit R1-R3... Resistor TI, T2... Transistor Dl... Diode M... Motor

Claims (1)

[Claims] In a motor drive circuit including a semiconductor element for driving a motor, a braking semiconductor element connected in series with the semiconductor element in order to remove energy generated in the motor when driving the motor is stopped. What is claimed is: 1. A motor drive circuit comprising: a brake circuit including a brake circuit;