SU591814A1 - Drive control arrangement - Google Patents

Description

(54) DEVICE FOR DRIVE CONTROL

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The invention relates to the automatic control of equipment, to find application in the management of planing, grinding, slotting and other machine tools.

A device for controlling the drive is known, which contains zadakndiye selsyns, the outputs of which include the forming and switching blocks, the outputs of the selsyn air sensors are connected via a rectifier and a voltage cut-off unit to the input of the diode limiter of the forming unit xD. This device has low accuracy and low speed.

Closest to the proposed device for controlling the drive contains an adder, the inputs of which are connected through key elements to the first and second sensors of the executive body and to the inputs of the switch, the output of which is connected to the first input of the logic unit, the output of which is c “The atopa is connected to a speed reference input 2.

A disadvantage of this device is low accuracy.

The purpose of the invention is to increase the accuracy of drive control.

This goal is achieved by the fact that a second adder is entered into the device, the inputs of which are connected to the sensors of the actuator, and the output to the second input of the logic unit.

The drawing shows a structural electrical circuit of the device.

The device contains sensors 1 and 2 for the movement of the executive body, switch 3, adders 4 and 5, logic block 6, key elements 7-10 and speed reference block 11.

The device works as follows.

Let the actuator be at the rearmost position. When the drive is turned on, the inverse control voltage from the sensor 2 of the actuator moves at its input from the speed reference unit 11, and logic unit 6 includes the key element 9.

The speed is adjusted by limiting the output voltage of the speed reference unit 11 to the required level. Depending on the dynamic characteristics of the drive and mechanism when operating at maximum speed, scaling the acceleration and deceleration sections with the specified acceleration in the chains of sensors 1 and 2 of the movement of the executive body and speed setting unit 11.

When moving forward, the logic unit 6 turns off the key element 9 and closes the key element 7, and the control unit receives the control voltage from the sensor 1 of the actuator. Then, the gage element 7 is disconnected, the key element 10 is closed, and the drive input receives the voltage from the actuator displacement sensor 2; the executive body is moving backwards. When the key element 10 is opened, the key element closes and an inverted voltage is applied to the drive input to sensor 1. Logic block b, controlled by adder 4, opens the key element 9, the drive reverses, and the actuator moves forward.

Such a control mode is envisaged for machines of the longitudinal grinding group, where high linearity of the speed of movement in the start and stop modes is required.

In planing and slotting machines, where maximum performance is required with high accuracy of the reverse points, and, accordingly, the accuracy of a given path of motion is high, control mode using key elements 7 and 10 is used. Through key element 7, a control voltage is supplied to the drive input sensor 1 — drive moves forward; control element 10 is supplied through key element 10 from sensor 2 — the drive moves backward.

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To switch from one control mode to another, the input circuits of logic unit 6 are re-connected.

The proposed device provides a wide unification when used in various machines (planing, grinding / slotting, etc).

This leads to a reduction in the time required for adjustment at the factory and machine tool factories. Simultaneous simplification of the scheme increases the reliability of machine tools This device is used in the development of the analog version of unified control devices for longitudinal processing machines.

Claims (2)

1. US Patent 3806788, M.C. 318-601, 1971. 2.Bai R.D. et al. Control of follow-up electric drives with the use of digital devices, Moscow, Energiya, 1969, p. 28-34.