JPS59178992A - Controller for motor - Google Patents

Abstract

PURPOSE:To eliminate the influence of ageing change or temperature variation of constant or element in a setter by obtaining a reference voltage by a pulse corresponding to the desired rotating speed and setter it as a set value. CONSTITUTION:A clock corresponding to the output frequency of an encoder EC is inputted by an oscillator OSC through a switch SW1 to a monostable multivibrator MM. An adder ADD is operated as a mere adder by a switch SW3 therein. A microcomputer muCP is stopped to produce output variation, and the output value is fixed as a set value. When a motor is driven, the switch SW1 is set to the encoder EC side, a switch SW2 is connected to a servo amplifier SA side, the switch SW3 is opened, and integrating function is provided in the adder ADD. The feedback voltage of the motor is inputted to the adder ADD, matched to the set value, and the rotating speed of the motor is automatically controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motor control device that can set the rotational speed of a motor to a desired value.

(Prior Art) FIG. 1 is a diagram showing an example of a conventional motor control device of this type. In this figure, the rotation speed of motor M is
The encoder FC converts the signal j into a pulse train signal having a frequency corresponding to the number of rotations. This pulse train signal is converted into DC voltage 0:B by a frequency voltage converter (hereinafter abbreviated as [-/V converter) FVC, and the difference from the set value R is determined by a subtracter SUB, and this difference voltage is used to control the servo control. It is amplified by the amplifier S and becomes the driving voltage of the motor M. In such a single-bore mechanism, the output of the subtracter SUB is automatically controlled to become zero, and by changing the set value 2, the rotational speed of the motor can be changed accordingly.

However, in such a conventional heater control device, there is a system (such as a monomulti) that converts the rotational speed of the motor M into direct current and converts the rotation speed of the motor M into a direct current (monomulti), and an F/2 converter that is composed of a r-router.
V converters, etc.), constants of elements, changes in temperature over time, or setting devices (normally, the reference voltage is divided by resistors). There was a drawback that the motor rotation speed would fluctuate for the same set price.

The present invention has been made in view of these drawbacks, and its purpose is to provide a motor control system that can always control the motor to a desired rotational speed.

(Structure of the Invention) The structure of the present invention to achieve this object is to generate a pulse train 16 according to the number of revolutions of the motor.
Convert the signal to DC's power using frequency/voltage conversion means,
an oscillator connected to a motor control device that controls the rotation speed of the motor based on a comparison between the converted voltage and a set value, and outputs a pulse train signal with a wave number of 1 to 41 corresponding to a desired rotation speed of the motor; , a base capable of converting the pulse train signal of the oscillator into the frequency/voltage converting means into DC current 1 and generating a base tJL voltage approximately equal to the 111-node converted voltage (with voltage generating means installed); The output value of the voltage generating means is used as the i constant (IC+) to the base.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram showing one embodiment of the present invention.

In the figure, IVI M is a mono-multi, switch SW
Output of encoder EC or oscillator O selected by 1
At the rising edge of the reference clock at 8C, the time constant is 1.
It outputs a pulse signal with a pulse width determined by .C1. This pulse output is smoothed by the filter "[and then guided to the adder A D +).μCP
is a micro combi coater which outputs data that sequentially changes (increases or decreases) from zero to the D/A converter []A. The output of this D/Δ converter DA is the IJII calculator AD.
Guided by D. 0fvlP is a comparator that compares the output of the adder ADD obtained through the switch SW2 with zero, and when they match, sends a stop signal to the microcomputer μCl' to stop the output change. It is.

Note that the adder △D f) has only an addition function, depending on whether or not a capacitor is connected to the feedback path (selected by switch SW3). I am now able to select +t< (in 1st history,
The output of the pupil △I) [) is sent to switch SW2.
At the time of actual control, → Boobo Ambush SA 9
There are 4 guns, like 4'I.

A) 4-J to the morph control device of this J, eel 4f4 formation
The operation of the four guns will be explained below with reference to FIG. The number of revolutions of the 1 Nicou M is determined by the pulse train 13 (a in Figure 3) output from the End J-da C, which has two motors 4Illl and 4I l- (converted to DC level and used to transmit fee 1-pack. Therefore, the number of revolutions of the motor is en: l
- can be seen as different pulse train frequencies. If the encoder EC reads 10 pulses and 7 rotations, (3Q
r, p, m are 10D, +1. It can be replaced by the frequency of S. Here, switch S is placed on the oscillator O8C side.
When W 1 is defeated and 10p, p, s, pulses are manually applied, the circuit (yo motor is 601", p, m
, you can simulate the movement while rotating. Therefore, first, the operation in which the set value rJ<regular time will be explained.

A clock (b in FIG. 3) corresponding to the output frequency of 12-1-1 [C] is manually inputted from the oscillator O8C to the monomulti MM via the switch SW1. The output of the monomulti Mfvi (Fig. 3C) is converted to a filter Fl-J, then to a filter FJ in Fig. 3d, and then to an adder ADD.
added to. The internal switch SW3 is set to work as an adder of +7, 1, and 5, and the microcombiner is connected via an A/A converter DA. The voltage gradually decreasing from the zero level l)t+ given by the filter P (FIG. 3f) is added to the output of the filter F1- (FIG. 3d). The added value is input to the comparator CMP via the switch SW2.
]/A converter 1) When the set value obtained from A becomes equal to the absolute value of the output of the filter FL, the output of the comparator CMP changes from "'I-1 to °" as shown in Figure 3e. Δ″l is added to L″′.

As a result, the output change of the microcomputer μc pt, ; is stopped +I:L ([) in FIG. 3, and the output value is fixed as the set value.

Next, the operation when the motor is actually driven will be explained.

Switch SW1 to encoder rE C side, switch S
Connect W 2 to 1 node SA side,
The switch SW3 is opened and the adder ADD has an integral function. With these switch settings, the feedback light corresponding to the rotational speed of motor M is 1
The input value is manually inputted to the calculator ΔDD, and compared with the set value, and the rotation speed of the motor M is automatically controlled so that the difference becomes zero.

In addition, when rotating at other rotation speeds (J, oscillator OS
This is done by changing the frequency of the clock. Assuming a variable frequency oscillator O8C (consists of a crystal oscillator and a frequency divider, it has an equal frequency of 2, and by changing the frequency division ratio of the frequency divider) frequency can be obtained.

Next, an example of a 1A unit included in the control circuit shown in FIG. 2 will be described. MaJ゛, Nananomaruji MM with Noiruku L/ He/
lz 4j, e-tar (7) rotation speed 300Or, p
, m.

Decide the constant so that it outputs C5V, but then
Make sure that this output changes between positive and negative as the motor rotates forward and reverse. Also, the D/A converter D A is 12b.
Using it, 100000 in binary-1-code
Center-stitch 000000 and make it possible to output 15V (i20, 05% resolution).

Here, suppose the motor rotation speed is 60Or.

When you want p, +n, if the encoder EC outputs 500 pulses per revolution or -6, then 5 K t
-l Z oscillation output from oscillator O8C to seven normal f-M
M, and the output of the filter [2F- should be human body-1■. Therefore, D, /A
Conversion'a l) A (7) 人j) wo100000
000000 As the color is increased by one bit, the output of one comparator CM drops to the zero level at a certain value (approximately 1'V).

If you memorize the input of the D/△ converter D△ at this time and output it as the setting 1 shift during actual operation, the difference will be 0.05%.
The motor rotates with an accuracy of .

If the rotation direction is reversed, the output of the filter 11- may be inverted to make the output of the D/A converter AD negative.

(Effects of the Invention) As explained above, according to the present invention, the motor can be rotated as desired without being affected by the feedback system in the Leeho circuit, constants and elements in the setting device, etc. over time, changes in humidity, etc. You can avoid rotation by number.

[Brief explanation of the drawing]

Fig. 1 shows an example of a conventional seven-point control device;
FIG. 2 is a circuit diagram showing an embodiment of a motor control device according to the present invention, and FIG. 3 is an operating waveform diagram of each part of the device shown in FIG. No small amplifier M...Motor EC...
・Encoder M M...E no multi O8C...
Light (Tatsun device F L...Filter μCP...Micro combinator D△...D/A converter Δ1 D...Additional V''>C
MP... Comparator SWl, SW2. SW3...Switch patent applicant
Konishiroku Photo Industry Co., Ltd. Agent Ben Soku Tsukishima Fuji Osamu

Claims (1)

[Claims] Motor control in which a pulse train signal corresponding to the motor rotation speed obtained by an encoder is converted into a DC lamp by a frequency/voltage conversion means, and the motor rotation speed is controlled based on a comparison between the converted voltage and a set value. In the device,
an oscillator that outputs a pulse train signal with a frequency corresponding to the desired rotational speed of the motor, and a reference voltage approximately equal to a conversion cell L1 obtained by converting the pulse train signal of the oscillator into a DC voltage by the frequency/voltage converting means. 14. A motor control device comprising: a reference voltage generating means capable of generating a reference voltage; and using the output voltage of the reference voltage generating means as the set value.