摘要:
A control circuit (11) for controlling an industrial robot in accordance with a position command signal and a position feedback signal (29), comprises an error register (22), a digital-analog converter (26), and a position gain multiplier (23) connected between the error register and the digital-analog converter. The circuit is operative such that when a motor (30) which drives the robot stops rotating or gets ready to stop rotating and an error value held in the error register (22) becomes higher than a predetermined value, the multiplication factor of the position gain multiplier is increased, whereby a higher positioning accuracy is achieved.
摘要:
A method and apparatus for sensing the current position of a movable element in a position control system which include first and second control devices each having command pulse generating means and error storage means for computing and storing an error between a number of command pulses and a number of feedback pulses indicative of an amount of motor movement, a speed control circuit for driving and controlling the motor on the basis of the error in the storage means, and a switching circuit for selectively connecting the first and second control devices to the speed control circuit, the current position of the movable element being sensed by the first control device when the second control device is connected to the speed control circuit. The method, which is also employed by the apparatus, includes the following steps when the second control device is connected to the speed control circuit: reading and storing, as a steady deviation, the error in the error storage means (101 e) of the first control device after the motor is rotated in accordance with the magnitude of drift of a closed loop formed by the second control device; updating the data in a current position register (202) of the first control device on the basic of an arithmetic difference found by subtracting the stored steady deviation from the data in the error storage means (101 e) of the first control device; and revising the data in the error storage means (101e) of the first control device on the basic of the arithmetic difference.
摘要:
Apparatus is disclosed for controlling the movement of a movable element (20 or 22) between an initial starting position and a final stopping position. The apparatus comprises drive means (34 or 36) coupled to the movable element and responsive to motor drive signals for moving the movable element (20 or 22) along a predefined path between the starting and stopping positions. The apparatus generates an actual velocity signal indicative of the actual speed of movement of the movable element, a position signal indicative of the distance remaining to travel by the movable element toward the desired stopping position and first and second command velocity signals respectively indicative of the minimum and maximum desired velocity levels for such particular distance remaining to travel. A controller (26) is responsive to the position signal for comparing the actual velocity signal with each of the first and second command velocity signals when the value of the position signal indicates the movable element has greater than a predetermined distance to travel, and for issuing the motor drive signals in response to such comparison for application to the drive means (34 or 36) to cause (a) the acceleration of the movable element (20 or 22) by the drive means when the comparison indicates the actual velocity of the movable element is less than the minimum desired velocity, (b) the coasting of the movable element when the comparison indicates the actual velocity of the movable element is more than the minimum desired velocity and less than the maximum desired velocity, and (c) the deceleration of the movable element by the drive means when the comparison indicates the actual velocity of the movable element exceeds the maximum desired velocity.
摘要:
A microcomputer controlled power tool (10) including a semiconductor control device (64) connected to the motor (66), one or more sensors (36, 58), and a microcomputer (50) interfaced to a keyboard (28) and digital display (30) for monitoring and controlling various operating conditions and parameters of the power tool.
摘要:
A spindle orientation control system having a speed control circuit (1) and a position control circuit (4) for rotating the spindle (7) of a machine tool at a commanded speed and for stopping the spindle (7) at a designated position with a high accuracy, the speed control circuit (1) decelerating the spindle drive motor (6) on the basis of a spindle stopping command. When a predetermined speed has been attained, a counter contained in the position control circuit (4) is triggered by a one-revolution pulse generated whenever the spindle (7) makes one full revolution, whereby the counter begins to count up position pulses each one of which is generated whenever the spindle rotates by a predetermined angle. After a preset predetermined number of pulses have been counted, operation shifts from the speed control mode to a position control mode, and said counter is preset to a number of pulses corresponding to the angle from the present position of the spindle to the desired stopping position. Said pulse number is counted down by the position pulses and, at the same time, a voltage having a level which is proportional to the content of the counter is applied to the spindle drive motor (6), thereby reducing its rotational speed. When the content of the counter reaches a value of zero, the spindle (7) is stopped at the predetermined position. Adjusting the value preset in the counter makes it possible to correct a spindle stopping position error that results from a difference in the position of the leading or trailing edge of the one revolution pulse, said differences arising because the position of the leading or trailing edge of the one-revolution pulse varies depending upon the direction of spindle rotation.
摘要:
A control circuit (11) for controlling an industrial robot in accordance with a position command signal and a position feedback signal (29), comprises an error register (22), a digital-analog converter (26), and a position gain multiplier (23) connected between the error register and the digital-analog converter. The circuit is operative such that when a motor (30) which drives the robot stops rotating or gets ready to stop rotating and an error value held in the error register (22) becomes higher than a predetermined value, the multiplication factor of the position gain multiplier is increased, whereby a higher positioning accuracy is achieved.
摘要:
Apparatus is disclosed for controlling the movement of a movable element (20 or 22) between an initial starting position and a final stopping position. The apparatus comprises drive means (34 or 36) coupled to the movable element and responsive to motor drive signals for moving the movable element (20 or 22) along a predefined path between the starting and stopping positions. The apparatus generates an actual velocity signal indicative of the actual speed of movement of the movable element, a position signal indicative of the distance remaining to travel by the movable element toward the desired stopping position and first and second command velocity signals respectively indicative of the minimum and maximum desired velocity levels for such particular distance remaining to travel. A controller (26) is responsive to the position signal for comparing the actual velocity signal with each of the first and second command velocity signals when the value of the position signal indicates the movable element has greater than a predetermined distance to travel, and for issuing the motor drive signals in response to such comparison for application to the drive means (34 or 36) to cause (a) the acceleration of the movable element (20 or 22) by the drive means when the comparison indicates the actual velocity of the movable element is less than the minimum desired velocity, (b) the coasting of the movable element when the comparison indicates the actual velocity of the movable element is more than the minimum desired velocity and less than the maximum desired velocity, and (c) the deceleration of the movable element by the drive means when the comparison indicates the actual velocity of the movable element exceeds the maximum desired velocity.
摘要:
Ein Gleichstrommotor (1) ist mit einem Sensor (2) verbunden, der eine 360° -Drehung des Motors in Einzelschritte unterteilt. Bei Bewegung erzeugt der Sensor (2) für jede Teilung ein sinusförmiges Spannungssignal. Daraus wird in einem Differenzierglied (6) durch Addition der differenzierten letzten Halbwelle des Sensor-Spannungssignals vor der Sollstellung zu einem proportionalen Anteil eine Summenspannung gewonnen. In einer Schaltung (11) wird eine Regelspannung mit abklingendem Verlauf bereitgestellt, die von der Steuerung (7) an einen Vergleicher (8) durchgeschaltet und mit der Summenspannung verglichen wird. In Abhängigkeit von den positiven und negativen Abweichungen der Summenspannung von der Regelspannung wird der Motor-Betriebsstrom von einem Steuerschalter (9) in Vorwärts- und Rückwärtsdrehrichtung angelegt.