JPS59113785A - Drive controller for motor - Google Patents

Abstract

PURPOSE:To drive motors with accurate prescribed relationship even if driven at a high speed by commonly using a digital drive control signal for the motors. CONSTITUTION:Since digital drive signals 120, 122 for reel motors 10, 12 are converted into analog values via the same D/A converter 40, the signals 120, 122 are converted to analog values with the same conversion gain. Accordingly, no difference occur in the feeding amount and winding amount of a magnetic tape 18 between the reels 14 and 16, with the result that even if the tape 18 is fed at a high speed, no variation occurs in the tension, thereby enabling to feed the magnetic tape 18 stably.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a motor drive control device that controls the drive of a plurality of motors in a predetermined relationship with each other, and in particular, a motor drive control device that controls the drive of a plurality of motors with a predetermined relationship between them. The invention relates to a motor drive control device that is then supplied to a drive amplifier that drives each motor.

Prior Art In a conventional device of this type, a digital drive control signal for each motor is given to a DA converter provided exclusively for each motor and converted into an analog signal separately, and each of the analog-converted drive control signals is converted into an analog signal. A signal was provided to a drive amplifier that drove the valley motor.

However, there is a slight difference in the conversion gain of each DA converter, so conventionally, the mutual relationship between digital drive control signals for each motor and the mutual relationship between analog-converted drive control signals As a result, it is impossible to drive and control each motor with an accurate predetermined relationship with each other, and this is especially true when each motor is driven and controlled at high speed. There was a problem.

This poses a serious problem in reel-to-reel type magnetic tape devices. That is, in this type of magnetic tape device, the speed of both motors that drive the valley reels is controlled according to the amount of tape on each reel, that is, the diameter of the tape, so that the speed of the tape passing through the magnetic head section is controlled at a constant rate. However, due to the difference in the characteristics of the A converter, the mutual relationship between the analog-converted control signals collapses from the expected relationship, so the winding amount of the magnetic tape by one motor differs from that of the other. An error occurs in the amount that the magnetic tape is fed by the motor, causing fluctuations in the tension on the magnetic tape.If the running speed of the magnetic tape is increased, the fluctuations become significant and it becomes impossible to control the running of the magnetic tape. Ta.

As mentioned above, in the conventional equipment of this building, each of 1)A
Since there are differences in conversion gain in the FI converter, it is impossible to drive and control each motor with a precise predetermined relationship to each other, and when the speed of the valley motor is high, such There was a problem that drive control became impossible.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems.
The purpose is to provide a motor drive control device that can control the drive of a plurality of motors while maintaining a precise predetermined relationship with each other.

In order to achieve the above object, the present invention provides a motor drive control device that drives and controls a plurality of motors in a predetermined relationship with each other, and includes a DA converter that converts a digital drive control signal for each motor into an analog signal. and a switch for distributing and outputting each analog-converted drive control signal to a drive amplifier that drives the valley motor, and the DA converter is shared by each drive control signal in a time-sharing manner. .

Embodiments of the Invention Hereinafter, preferred embodiments of the apparatus according to the present invention will be described based on the drawings.

FIG. 1 shows a control system of a reel-to-reel type magnetic tape device to which the present invention is applied, and FIG. 2 shows its magnetic tape mounting section.

Since the magnetic tape device of this embodiment is of a reel-to-reel type, the reels 14 and 16 are driven by only two reel motors 10 and 12, and the magnetic tape 18
is run at a predetermined speed between the two wheels 14 and 16, and is sent out from one of them and taken up by the other.

The reel motor 10.12 has a drive current 100.12 outputted from drive amplifiers 20, 22 consisting of constant current amplifiers.
102, respectively. The drive amplifiers 20 and 22 are supplied with analog drive control signals 104 and 106 from a control circuit 24, respectively.

In this embodiment, this control circuit 24 is an upper M/T.
The drive control signals 104 and 106 are outputted to the motor 10 in accordance with the basic command 108 given from the controller.
. It is. Note that a head 28 performs loading of data onto the magnetic tape 18 and unloading of data from the magnetic tape 18.

Further, the reel motor 10.12 includes a rotation detector that outputs rotation detection pulses 112, 114 every rotation,
The amount of movement of the magnetic tape 18 is detected by the tape movement amount detector 3.
It has been detected in 2.

The rotation detection pulses 112 and 114 output from the reel motor 10 and 12 and the tape movement detection pulse signal 11 output from the tape movement amount detector 32 and the basic command 108 are transmitted to the logic control circuit in the control circuit 24. 30 is supplied.

The control circuit 24 is provided with a control memory 34 in which control characteristic data 118 representing the relationship between the radius of the magnetic tape of the reel 14, 16 and the load inertia is stored in advance. Data 118 is provided to logic control circuit 3o.

The logic control circuit 3o has a rotation detection pulse of 112°114.
The tape radius of the reel 14.16 is determined by counting the number of pulses of the signal 116 per rotation of each reel motor 10.12 from the tape movement detection pulse signal 116 and the tape movement detection pulse signal 116, and control is performed using each determined tape radius. The speeds of the valley reels 14 and 16 can be determined from the characteristic data 118, and digital drive control signals 120 and 122 corresponding to these speeds can be output.

The digital drive control signals 120 and 122 are supplied to the switching circuit 3.
6 is input to the switch 38. This switch 38 is supplied with a switching control signal 124 from the logic control circuit 30, and the switch 38 is supplied with digital drive control signals 120, 12.
2 can be alternately switched and output to the DA converter 40. The DA converter 40 can convert the alternately applied digital drive control signals 120° and 122 into analog signals.

In the present invention, only one DA converter is used even though a plurality of motors are used.

Each of the drive control signals 104 and 106 converted into analog by the DAfi converter 40 is supplied to a switch 42 provided in the switch circuit 36. The switching control signal 124 is supplied to the switch 42, so that the drive control signal 104 corresponding to the digital control signal 120 is supplied to the drive amplifier 20, and the drive control signal 106 corresponding to the digital control signal 122 is supplied to the drive amplifier 22. distributed to.

As described above, in the present invention, the DA converter is used in a time-division manner according to each drive control signal by the switching action of the switch. Note that when the DA converter 40 is used in a time-sharing manner as described above, the switching period of each switch 38 and 42 is set to be sufficiently smaller than the electrical time constant of the reel motor 10° 12 in this embodiment. In the example it is required.

A preferred embodiment of the present invention has the above configuration, and its operation will be explained below.

When a basic command 108 such as start and stop is given to the control circuit 24 from the upper M/T controller, drive control signals 104 and 106 are outputted from the control circuit 24 to the drive amplifiers 20 and 22, respectively, and the drive amplifier 20
, 22 drive currents 100, 104, reel motor 1
0.12 is driven accordingly. As a result, reel 14
．． 16 is driven to accelerate the magnetic tape 18, run it at a constant speed, or decelerate it.

At this time, the logic control circuit 30 uses the rotation detection pulses 112, 114 of each reel motor 10, 12 and the tape movement detection pulse signal 116 of the tape movement amount detector 32 to generate a signal per rotation of each reel motor 10, 12. Count the number of pulses of 116 and reel 14.1 from the counted value 1
6, the drive speed of each reel motor 10° 12 is determined from the control characteristic data 118 in the control memory 34 given in advance using these tape radii, and the digital drive control signals 120, 122 corresponding to these speeds are determined. Output.

The switch 38 then outputs the digital drive control signal 120.1.
22 are alternately switched and outputted to the DA converter 40, and the DA converter 40 converts them into analog drive control signals 104, 1.
Convert to 06. Those drive control signals 104, 106
is distributed to the drive amplifiers 20 and 2:H by the switch 38 and the switching control signal 124 (switcher 42 synchronized with the iron), and the drive amplifiers 20 and 22 receive the drive control signal 10.
A drive current of 100° 102 is supplied to the reel motors 10, 12 in accordance with the reel motors 10, 106, respectively.

As a result, the reel motors 10 and 12 have a driving current of 100
Drive the reels 14 and 16 respectively according to ゜102,
Therefore, if the reel 14 is a file reel and the reel 16 is a machine reel, the magnetic tape 18 is fed out from the file reel 14 and wound onto the machine reel 12, for example.

The magnetic tape 18 is run as described above, but as described above, the control characteristic data 118 is
Since the relationship between tape radius and load inertia of 6 is given, reel 14.16 by reel motor 10.12
Digital drive control signals 120 and 122 having values that make the feeding and winding speeds of the magnetic tape 18 the same are obtained.

Since these digital drive control signals 120° and 122 are converted into DAi by the same DA converter 40, the D
During the A conversion, no error occurs in the conversion gain, and therefore the feeding and winding speeds of the magnetic tape 18 between both reels 14 and 16 are the same, and as a result, the tension of the magnetic tape 18 does not vary. , always remains constant.

When the basic command 108 to write data to or read data from the magnetic tape 18 while it is running is given to the control circuit 24, the write/read control signal 110 causes the write/read control circuit 26 to control the head. At 28, data is written to or read from the magnetic tape 18.

Effects of the Embodiment As explained above, according to this embodiment, the reel-to-reel system is adopted, so each reel is A buffer mechanism using vacuum is required to absorb the speed difference between the two motors that rotate the motor and the motor that drives the Cavstein. Therefore, it is possible to simplify the mechanism of the magnetic tape device.

Also, digital drive control signals 120.12 for each reel motor 10.12. The digital drive control signal 120 is converted into an analog signal by the same l)A converter 40.
, 122 are converted into analogs with the same conversion gain. Therefore, there is no difference in the amount of feed and winding of the magnetic tape 18 between the reels 14 and 16, and as a result, the magnetic tape 18 is converted into analog data with the same conversion gain.
Even when the magnetic tape 8 is run at a high speed, the tension does not change, and therefore the magnetic tape 18 can be run stably.

As described above, according to the first embodiment, a magnetic tape device with a simple structure and high performance can be provided.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described in detail, the digital drive control signals for each motor are shared by the same DA in a time-sharing manner.
Since the digital drive control signals are converted from analog to analog in the converter and supplied to the drive amplifiers that drive each motor, each digital drive control signal is converted into an analog signal with the same conversion gain, so the mutual relationship between the digital drive control signals is The relationship between the analog drive control signals remains unchanged, and as a result, even when each motor is driven at high speed, the drive control is maintained in an accurate predetermined relationship, ensuring accurate motor control as desired. It becomes possible to do so.

In the above embodiment, a case has been described in which the reel motors 10° and 12 are controlled to have a predetermined speed relationship, but the present invention is such that the rotation angle, torque, etc. of each motor are controlled to have a predetermined relationship with each other. It can also be applied when controlled by

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a control system according to a preferred embodiment of the present invention, and FIG. 2 is an explanatory diagram of a magnetic tape mounting section of the embodiment shown in FIG. DESCRIPTION OF SYMBOLS 10, 12 River reel motor 14, 16... Reel 18... Magnetic tape 20, 22... Drive amplifier 24... Control circuit 3
0...Logic control circuit 32...Tape movement amount detector 34...Control memory 4o...DA converter 42...
switch

Claims (1)

[Claims] (In a motor drive control device that drives and controls a plurality of motors with a predetermined relationship between them, a DA converts a digital drive control signal for each motor into an analog signal.
It is characterized by comprising a converter and a switching device that distributes and outputs each analog-converted drive control signal to a drive amplifier that drives each monitor, and the DA converter is shared in a time-divisional manner by each drive control signal. motor drive control device.