JPS58170388A - Drive control system for motor - Google Patents

Abstract

PURPOSE:To prevent runaway of a motor by generating a control signal after the time which is determined in advance in response to the current set data set signal to a current set register and controlling the drive of the motor in response to the control signal. CONSTITUTION:When a microprocessor 1 enters the control time zone for servo controlling the motor 6, a current set data which is determined in response to the speed signal from the motor 6 is supplied to a current set register 2, and set to the register 2 in response to the current set data set signal on the line 3. This set data is converted to an analog value via a D/A converter 4, supplied to the motor 6 through a motor driver 5, thereby driving the motor. This drive control is performed at every predetermined current set data set signal, and the operation of the control signal generating circuit means 9 is carried out together with the drive control.

Description

Detailed Description of the Invention (1) 1 Technical Field of the Invention The present invention relates to a motor drive that improves the control mode when the drive control of the motor is performed in a control system that also includes other controlled objects. Regarding control method.

(2) Background of the Invention In magnetic tape devices and the like, the microprocessor that controls them is also under the control of a higher-level controller. Control of a motor used to drive the magnetic tape is also incorporated into such a control system, and the motor is driven and controlled within the flow of such control. Then, depending on the control status within the control system, a situation may arise where the control system cannot fully control the motor when motor control is required, causing the motor drive to fall into an abnormal state. There is a need for improvement.

(3) Prior Art and Problems In the control system as described above, the microprocessor that is involved in controlling the motor controls and manages the entire magnetic tape device, while also controlling the connection with the host model. must also be processed.

Therefore, since the microprocessor is not dedicated to the servo control of the motor, the microprocessor must deal with processing requests that occur at random in terms of timing, in addition to the servo control.

When processing such control, even if the microprocessor is processing the above-mentioned servo control, if a processing request with a higher priority occurs, the processing will be directed to that processing request. Therefore, the servo control of the motor cannot be controlled by the microprocessor. As a result, depending on the servo control state up to that point, it is inevitable that the motor will actually run out of control. In the case of a magnetic tape device, such runaway may lead to the magnetic tape being cut off, resulting in loss of data, and the resulting damage is significant.

(4) 1. Purpose of the Invention The present invention was devised to solve the above-mentioned drawbacks of the conventional system as much as possible. An object of the present invention is to provide a motor drive control system that does not cause runaway of the motor even when the motor is controlled.

(5) Configuration of the invention The purpose is to have a controlled object in addition to the motor,
In a motor drive control method in which the motor is controlled by setting motor current setting data in a current setting register by a control system that controls the motor in response to a speed signal detected from the motor, the current to the current setting register is This is achieved by providing a control signal generating circuit 3 that generates a control signal after a predetermined time in response to a setting data set signal, and controlling the drive of the motor in response to the generation of the control signal. .

(6) Example of 0 invention Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the invention. In this figure, reference numeral 1 denotes a microprocessor, which performs various control operations in response to the operating status of a controlled object, for example, the operator panel of a magnetic tape device, and various sensors. It is also used to perform various controls with the model. 2 is a current setting register, which sets current setting data from the microprocessor 1 by a current setting data set signal generated from the microprocessor 1 on a line 3 at predetermined intervals, for example, every 100 μsec. It is for keeping.

The output of this register 2 is the digital-to-analog converter (
The output of the DAC 4 is connected to the input of a motor driver 50, and the motor 6 is configured to be driven by the output signal of the motor driver 5. Reference numeral 7 designates a tachometer generator connected to the rotating shaft of the motor 6, and 8 a tachometer that generates a speed signal in response to the output signal of the generator turf.The output of the tachometer 8 is connected to the input of the microprocessor 10.

9 is a control signal generating circuit means which generates a predetermined signal in response to a current setting data set signal on line 3 and a clock pulse of predetermined time ib intervals, e.g. 1 msec, sent via line 10. circuit means for generating a control signal after a specified period of time. This circuit means 9 comprises, for example, two cascaded J-flip-flop circuits 11.1.
2, and a flip-flop circuit 1 is connected to the first stage J- of the whistle.
A binary 1" or high level is connected to the J input of the 1, and a binary 'O" or low level is connected to its input.

The set output of the first stage flip-flop circuit 11 is connected to the J input of the second stage flip-flop circuit 12, and the reset output is connected to the input of the circuit 120.

A clock pulse (the pulse interval is, for example, 1 m5ec) from a clock source (not shown) is supplied to the set input of the flip-flop circuit 11.12 connected in this way, and current setting data is supplied to the reset input of the circuit 11.12. The set signal is arranged to be supplied via line 3. A control signal is generated at the output of flip-flop circuit 12. This control signal is connected to the clear input of register 2, for example.

The operation of the above configuration circuit will be explained.

When the microprocessor 1 enters the control period for servo control of the motor, it sends current setting data determined according to the speed signal from the motor 6 to the current setting register 2, and responds to the current setting data set signal on the line 3. Then that day 4't
Set in register 2. This set data is D
The AC4 converts the signal into an analog value, which is supplied to the motor 6 via the motor driver 5, and used to drive the motor.

This drive control is performed for each predetermined current setting data set signal, and the operation of the control signal generating circuit means 9 is also performed in parallel with the above drive control. That is, clock pulses having a predetermined clock pulse interval are supplied to the set inputs of the seven lip-flop circuits 11 and 12, and when the set conditions are met, the circuit 11
．． 12 set movements are caused, line 3
The circuits 11 and 12 are reset by receiving the above current setting data set signal at the reset input. If the normal servo control tube is in a state where it can be performed, the current setting data set signal is generated every 100μ8ee, for example, so the clock pulses supplied at 1m5ec intervals are applied to the set input of circuits 11 and 12. is supplied to set the first flip-flop circuit 11.1. Even if the first flip-flop circuit 11 is reset by the current setting data set signal supplied at short intervals as described above, before its output causes the second flip-flop circuit 12 to be set. Therefore, the set output of circuit 11 is
It is not effective for setting the flip-flop circuit 12 of. Therefore, no control signal is generated from the circuit 12, which does not cause any dahlia operation of the register 2, and therefore does not cause any effect on the servo control of the motor 6.

However, if the control in the control system is not able to control the servo operation of the motor and the servo operation control continues for more than 2 msec in the above example, the first and second stage flip-flop circuits Since the current setting data set signal is no longer supplied to the reset input of 11.12, the setting of circuit 12 is also caused to occur following the setting of circuit 11. Therefore, the control signal will not be generated from the circuit 12 and will not be updated for 2m5ec.
The data in register 2 located in is cleared. Therefore, the runaway of the motor caused by such a long period of not updating data is prevented, so there is no risk of the magnetic tape cutting, etc., and the data on the magnetic tape is also preserved. Ru.

FIG. 2 shows the main part of a second embodiment of the present invention. In this embodiment, a control signal from a control signal generating circuit means 90 is supplied to a relay driver 13, and a relay 14 is operated by the output signal of the driver. The difference is that the switching contact 15 switches the connection of the motor 6 to the motor driver 5 to the connection to ground.

Therefore, their functions and effects are essentially the same except for differences due to differences in configuration.

Further, the control signal generated from the control signal circuit means 9 may be used as an interrupt signal for controlling a microprocessor or a control system including the microprocessor.

Note that the control system referred to in this specification may refer to a microprocessor itself that controls various controlled objects, or may refer to a system including such a microprocessor.

(7) 0 Effects of the Invention In short, according to the present invention, a control signal is generated after a predetermined time in response to a current setting data set signal to a current setting register, and a motor is controlled in response to this control signal. By controlling the drive of the motor, it is possible to prevent the motor from running out of control even when the motor is controlled by a control system that has other objects to be controlled than the motor.

Therefore, when the driven object driven by the motor is a magnetic tape, the magnetic tape will not be cut or the like, and the data on the magnetic tape can be preserved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the invention, and FIG. 2 is a diagram showing a second embodiment of the invention. In the figure, 1 is a microprogram, 2 is an electrical setting register, 6 is a motor, and 9 is a control signal generation circuit means. 11- Figure 1 Figure 2

Claims (1)

[Claims] 1) The current setting data of the motor is set by a control system that has a controlled object in addition to the motor and controls the drive of the motor in response to a speed signal detected from the motor. In a motor drive control method in which the drive of the motor is controlled by setting in a register, control signal generating circuit means generates a control signal after a predetermined time in response to a current setting data set signal to the current setting register. 1. A motor drive control system, comprising: a drive control system for a motor, wherein the drive of the motor is controlled in response to the control signal. 2) The motor drive control method according to claim 1, wherein the control signal is an interrupt signal to the control system. 3) The motor drive control method according to claim 1, characterized in that the current setting register is reset by the control signal. 4) The motor drive control method according to claim 1, wherein the motor is forcibly stopped by the control signal.