JPS63194597A - Controller for dc motor - Google Patents

Abstract

PURPOSE:To reduce the quantity of transistors to about half and make the title controller inexpensive, by a method wherein shared transistor arms and (n) pieces of individual transistor arms provided to control (n) sets of DC motors. CONSTITUTION:A transistor QAO and the transistor QBO constitute a transistor arm shared for the control of a plurality of motors M1, M2...Mn. The transistor QA1 and the transistor QB1 constitute an individual transistor arm for the motor M1. The transistor QA2 and the transistor QB2 constitute the transistor arm for the motor M2. The transistor QAn and the transistor QBn constitute the transistor arm for the motor Mn. The normal rotation, reverse rotation and braking operation of the motor M1 are controlled by controlling the transistors QA1, QB1. Only one set among (n) sets of motors M1, M2..., Mn is selected to control the normal rotation, reverse rotation and braking operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transistor circuit that controls the rotation of a plurality of motors.

[Conventional technology]

FIG. 8 is a circuit diagram showing a conventional DC motor control device that controls a plurality of DC motors.
, Mz is a DC motor, QAO, QAI.

QAl, QA3. QA4. Qll is a PNP transistor, Q s o + Q m
+ + Q s z + Q B 31 Q 114 is an N P N transistor, of which QAa and Q8°.

QAI and Ql・QAt and Q82・QA3 and Q113
- QA4 and Ql constitute a transistor arm connected to the power supply line. And this transistor arm 2! Direct current motors M+, Mz, and Ms are connected between the midpoints of each arm with IJl bare. Also, Q3□, Q□Z + Ql13 are NPN
Transistor, DC motor M+, Mt 1M3
Connect to and use when braking.

Next, the operation will be explained. Transistor QAOIQa
Motor M1 and brake QII between the midpoints of each arm of O, QA, and Q□! 1 is connected, these blocks form a block, and multiple identical blocks are provided to control multiple motors, so for the sake of detailed explanation, I will use the motor M+ block as a representative. explain.

First, when operating the motor M1 in the normal rotation (representing the rotational direction of the motor), transistors QA1 and Q8° are set to the saturated or active state, and the other transistors QA, , Q
, , Ql11 is controlled by setting it to a cut-off state. Next, when operating the motor M in the reverse direction (indicating that the direction of rotation of the motor is opposite to the normal rotation), transistors QAo and Ql are set to the saturated or active state, and the other transistors QA I, Q m o, Q Il
□ is controlled by setting it to the cut-off state. Further, when the motor M1 is in a rotating state and a brake operation is to be performed to suddenly stop the rotation, transistors Q and □ are set to the saturated or active state, and the other transistors Q A O and Q A
l, Q yr. , Q, 1 is controlled by setting it in a cut-off state.

The two pairs of arms and brake transistors operated in this manner form a set for one motor, and by providing the same number of sets as the number of motors, each motor can be controlled.

[Problem that the invention seeks to solve]

Since the conventional DC motor control device is configured as described above, it is necessary to install five transistors for one motor, and since the transistors that can be used here are for high power use, heat dissipation is required. The need to take this into consideration has led to problems such as an increase in the space occupied by the circuit board layout and an increase in cost.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a DC motor control device that can control a large number of motors with about half the transistors of the conventional device described above. .

[Means for solving problems]

The DC motor control device according to the present invention has two
one common transistor arm consisting of two transistors connected in series, one individual transistor arm consisting of two transistors connected in series between the power supply lines, and the midpoint of the common transistor arm and the zero n DC motors connected between the midpoints of each individual transistor arm, and each transistor in the shared or individual transistor arm is controlled by an independent signal. .

[Effect]

The DC motor control device according to the present invention includes one shared transistor arm in which two transistors are connected in series to the power supply line, and zero individual transistors in which two transistors are connected in series between the power supply lines. and n DC motors connected between the midpoint of the shared transistor arm and the midpoint of each of the 0 individual transistor arms, and each transistor of the shared or individual transistor arm is The circuit is controlled by independent signals, and when performing forward and reverse rotation of the motor, brake operation, and motor selection operation, the transistors that make up the circuit are shared or used. The number of circuit boards can be reduced, the space occupied in the layout of the circuit board can be reduced, and costs can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a circuit diagram showing a DC motor control device according to an embodiment of the present invention. and Q. is a transistor that constitutes a transistor arm that is shared to control multiple motors, and ■. and I. is an input terminal that controls this shared transistor arm. Also, QAl and Qa
+ is a transistor that constitutes an individual transistor arm for motor M1, ■□ and 11 are input terminals that control the transistor arm for M1, and QA□ and QB□ are transistors that constitute a transistor arm for motor M2. Yes, IAz, I. is an input terminal that controls this transistor arm for M2. Similarly, Q and Q are transistors forming a transistor arm for motor Mn, and IAa and l1lfi are input terminals for controlling this transistor arm for Mn. Also VC
C is a connection terminal to the power supply, GND is a grounding terminal, and Vc
A power supply voltage is applied between C and GND.

Next, the operation will be explained.

In the embodiment shown in FIG. 1, when motor M1 is rotated forward, transistors QA0 and Q are set to the saturated or active state, and transistors QAI and qso are set to the cutoff state. Furthermore, when reversing motor M, transistor q
Set Ao and Q, 1 to the cut-off state, and transistor QAI
and Q8° are set to saturation or active state. Also motor Ml
When operating the brake, transistors QIO and Q□
set to saturation or active state, transistors Qao and QA
l is set to a cutoff state. Another method for braking motor M is to set transistors QA0 and QA to the saturated or active state, and then set transistor Q. and Q may be set to a blocked state. If motor M1 is not selected, transistors QA and QB+ may be turned off. Note that when motor M1 is selected to perform forward rotation, reverse rotation, or brake operation, other motor M2
, M3, . . . Mfi-1, M are in an unselected state, so the transistors Q^Z+ QA,
, ”+QAll-110a,1 and transistor Q
ffg.

QB! , . . . + q, , -, , Qlrn are set to the cutoff state.

Next, when operating any of the motors M2 to Mn, only one of the n motors Ml, M2, . . . , Mn in FIG. You can select and control forward and reverse braking operations.

FIGS. 4 and 5 show the ON and OFF states of each transistor for the motor Mn in this embodiment when the motor rotates in the forward and reverse directions.
Figures 6 and 7 showing the state of the FF are diagrams showing how each transistor is turned on and off during the braking operation.

Also, the above rule i'l! ! By dividing the method in time and operating it continuously, it is possible to control a desired number of motors out of n motors in a time-division manner when viewed within a certain time interval.

Further, reverse energization braking operation is also possible by rapidly controlling the motor from a normal rotation state to a reverse rotation state. Of course, when the motor is rotating in reverse, reverse energization braking can be performed by rapidly controlling it in the forward rotation direction.

In the above embodiment, a DC motor capable of forward and reverse rotation was used, but any type of motor that can operate on DC can be used with the circuit system of the present invention. Selective motor control becomes possible.

In addition, in the above embodiment, the transistor arms are PNP and N.
Although we have shown an example of a configuration using PN transistors, it is also possible to configure the transistor arm using only NPN type transistors, as shown in Figure 2.
Similarly, it is also possible to use only PNP type transistors, FET transistors, and MOS transistors. In other words, any element constituting the transistor arm can be used as long as it can be set to a saturated or active state, and can also be set to a cutoff state.

FIG. 3 is a diagram showing another embodiment of the present invention in which a diode is connected to the circuit of the above embodiment to protect the transistor from the back electromotive force of the motor. In this circuit, the back electromotive force of the motor is If this happens, a protection diode will work to prevent the transistor from being damaged.

〔Effect of the invention〕

As described above, according to the present invention, in a DC motor control device, one common transistor arm is formed by connecting two transistors in series to the power supply line, and two transistors are connected in series between the power supply line. 0 individual transistor arms, and n DC motors connected between the midpoint of the shared transistor arm and the midpoint of each of the 0 individual transistor arms. Each transistor in the individual transistor arm is controlled by an independent No. 13, and the number of transistors used can be reduced by about half, making the device cheaper and reducing the number of parts that make up the device. This has the effect of reducing the space occupied (volume or weight).

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a DC motor control device according to one embodiment of the invention, FIGS. 2 and 3 are circuit diagrams showing a DC motor control device according to another embodiment of the invention, and FIG. 4 is a circuit diagram showing a DC motor control device according to another embodiment of the invention. FIG. 5 is a diagram for explaining the forward rotation operation of the DC motor control device according to the invention, FIG. 5 is a diagram for explaining the reverse rotation operation of the DC motor control device according to the invention, and FIGS. FIG. 8, which is a diagram for explaining the braking operation of the motor control device, is a circuit diagram showing a conventional DC motor control device. QA0 to QAll are PNP transistors, QA/. ~Q
A no. Qao-wQan is an NPN transistor, M, ~Mn
is a DC motor, IAO~r AR+ I No~I0
is a control input terminal.

Claims (3)

[Claims] (1) One common transistor arm consisting of two transistors connected in series between the power supply lines, and a first common transistor arm consisting of two transistors connected in series between the power supply lines.
~nth (n is an integer greater than or equal to 2) n individual transistor arms connected between the midpoint of the shared transistor arm and the midpoint of each of the first to nth individual transistor arms; 1. A DC motor control device comprising: first to nth DC motors, wherein each transistor of the shared or individual transistor arm is all controlled by an independent signal. (2) The above shared or individual transistor arm is NP.
The DC motor control device according to claim 1, characterized in that the device comprises an N transistor and a PNP transistor. (3) Claim 1, characterized in that each of the two transistors in the shared transistor arm and the transistor arm are NPN transistors.
The DC motor control device described in .