JP3095984B2 - Positioning drive - Google Patents

Abstract

The positioning drive uses a brushless DC electric motor (1,2), preceded by a positioning control which compares the actual position with the required position for controlling the electric motor. The motor includes a rotor position indicator (3) and cooperating sensors (S1,S2,S3), providing signals used by the commutator control (4) for the motor and as the actual position signals for the positioning control. Pref. the motor is coupled to the positioned element via a play-free drive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a positioning drive for an adjusting member, for example, an adjusting member of a register remote adjusting device or an adjusting member of an ink metering device, which is arranged in a printing press. This positioning drive device relates to a positioning drive device having a positioning control unit connected to an electrically controllable motor.

[0002]

BACKGROUND OF THE INVENTION Conventional printing presses, such as sheet-fed offset printing presses, have a number of positioning drives. Here, for example, a register remote adjustment device, a finely adjustable ink metering device, a stopper to be adjusted depending on the format, and the like are included. Normally, a DC motor, a synchronous motor or a step motor is used as a positioning drive.
These motors normally act on the adjusting element to be adjusted via a transmission. In order to be able to detect the actual position of the adjusting member to be adjusted, an actual position sensor, for example, configured as a potentiometer, is assigned to the motor or the transmission. However, additional actual position sensors are costly.

[0003] Indeed, a stepper motor can be equipped without an actual position sensor. If a stepping motor is used, however, it must be ensured that the adjusting element or transmission to be adjusted does not lock or rotate asynchronously due to heavy movement of the motor rotor. This limits the use of the stepper motor to a small number of applications, possibly in conjunction with additional proximity sensors to detect the zero position.

[0004] Brushless DC motors are currently being increasingly used in printing presses. However, the positioning drive is used like a conventional DC motor. It is used in connection with an additional actual position sensor, for example in the form of a potentiometer.

[0005]

The object of the present invention is to provide a positioning drive of the type described in the preamble of claim 1 in terms of its structural technology in a simple and inexpensive manner.

According to the invention, the motor is configured as a brushless DC motor, the rotor of the brushless DC motor is connected via a transmission to the adjusting member to be adjusted, and the brushless DC motor has one It has a position transmitter and a plurality of sensors, and the plurality of sensors are connected to the commutation control unit and also to the position transmitter evaluation unit, and the position transmitter evaluation unit compares the value of the target position with the value of the actual position The positioning control unit is connected to the commutation control unit, and the position transmitter evaluation unit adds or subtracts the signals of the plurality of sensors according to the rotation direction of the brushless DC motor. The obtained actual position signal is supplied to the positioning control unit, and the positioning control unit compares the value of the target position with the value of the actual position. By outputting a corresponding signal to the commutation controller, the commutation controller rotates the rotor in a predetermined rotation direction based on the signals from the plurality of sensors and the signal from the positioning controller. This is solved by positioning the adjustment member driven by the rotor. Further developments of the invention are described in the dependent claims.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a brushless DC motor basically having an integrated rotor position identification device is used. The rotor position identification signal of the brushless DC motor is supplied to an electronic circuit for evaluating the position transmitter. This electronic circuit adds the signal in the form of an integral signal or subtracts it from the counting state if the direction of rotation is reversed, from which the actual position of the positioning drive or the actual position of the adjusting member driven thereby. Is calculated.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

The brushless DC motor has a rotor 1 and a number of windings 2 (here, for example, three windings) corresponding to the number of poles of the DC motor on the stator. The shaft of the rotor 1 is connected to an adjusting member to be adjusted, for example, an adjusting member of a register adjusting device, via a transmission (not shown) having substantially no play.

A position transmitter 3, for example, in the form of a disk magnet, is fixedly connected to the rotor 1. This marking of the position transmitter 3, for example a permanent magnet or an optically scannable marking, is
1, S2 and S3. Here, three sensors S1 to S3 are provided corresponding to the number of windings, but this is an example.

The signals from the sensors S1 to S3 are supplied to a commutation control unit 4. The commutation controller detects the position of the rotor 1 from these signals in a manner known per se and controls commutation accordingly. That is, the winding 2 is polarized so that the rotor 1 rotates in a predetermined rotation direction with respect to the current flow.

The signals of the sensors S1 to S3 are additionally supplied to a circuit as a position transmitter evaluator 5 provided according to the invention. This position transmitter evaluator is essentially configured as an (addition) counter and detects the actual position of the adjustment member to be adjusted by the rotor 1.
Depending on the required accuracy, the position transmitter evaluator 5
The signals of one or two or all sensors S1 to S3 are evaluated in order to determine the actual position. If the position transmitter evaluator 5 evaluates only the signal of the sensor, for example S1, the signal of the second sensor can be evaluated in order to obtain information on the direction of rotation of the rotor 1.

The position transmitter evaluator 5 includes a sensor S
The addition or addition of the position pulses sent out in steps 1 to S3 is performed if the rotation direction is reversed. For example, a transmission connected downstream of the rotor 1 or an adjustment member to be adjusted (not shown) has a fixed stop position, at which the rotor 1 is blocked, whereby the position transmitter evaluator 5 has a sensor The zero position can be derived, for example, in the form of a predetermined counter state when the signals S1 to S3 do not occur.

At the output of the position transmitter evaluation unit 5, an analog or digital signal of the actual position of the rotor 1 or of an adjusting element connected downstream thereof is output. This analog or digital signal is supplied to a positioning control unit 6, which receives an analog or digital signal as a target position on the other input side.
The positioning control unit 6 is configured as a comparator in a known manner, and detects in which direction the rotor 1 should be driven by forming a difference between the target position and the actual position. In response to the target / actual position comparison, the positioning control unit 6 outputs a corresponding signal to the commutation control unit 4, which drives the rotor 1 in a required direction or sets the rotor 1 in a stationary state. deep.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Winding 3 Position transmitter 4 Commutation control part 5 Position transmitter evaluation part 6 Positioning control part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Christian Schlegel Germany Diezenbach-Talstraße 37 (72) Inventor Joachim Blumer Germany Germany Heinburg Waldstrasse 10 (72) Inventor Albrecht Felts Germany Radar Mark Schwarzbachstrasse 5Geh (56) References JP-A-4-161,083 (JP, A) JP-A-60-1,18086 (JP, A) JP-A-61-117598 (JP, U)

Claims (2)

(57) [Claims] 1. A positioning drive for an adjusting member, such as an adjusting member of a register remote adjusting device, an adjusting member of an ink metering device, disposed on a printing press, the positioning driving device comprising: an electrically controllable motor ; the positioning drive system of the type having a connection has been positioning control unit, a motor (1,2) is configured as a brushless DC motor, the brushless DC motor (1, 2) rotor (1) of transmission The brushless DC motors (1, 2) are connected via a position transmitter (3) and a plurality of sensors (S1, S2, S3).
Wherein the plurality of sensors (S1, S2, S3) are connected to a commutation control unit (4) and a position transmitter evaluation unit
(5), and the position transmitter evaluator (5) is connected to the value of the target position.
Connects to the positioning controller (6) that compares the actual position value
The positioning control unit (6) is in contact with the commutation control unit (4).
Are continued, by the position transmitter evaluation unit (5), to give the addition or subtraction to in accordance with the rotational direction of the plurality of sensors (S1, S2, S3) signals the brushless DC motor (1, 2) The signal of the actual position that has been
(6), and the positioning control unit (6) supplies the value of the target position and the actual position.
And outputs a corresponding signal to the commutation control unit (4).
And the commutation control unit (4) outputs the plurality of sensors (S1, S1
2, S3) and the positioning control unit (6)
The rotor (1) is rotated in a predetermined rotational direction based on these signals.
Positioning drive device by Rukoto is rotated poled, characterized <br/> that the positioning of the adjusting member driven by the rotor (1). 2. The transmission or the adjusting member to be adjusted ,
The position transmitter evaluator (5) has a stopper for locking the rotor (1) in a predetermined direction, and the position transmitter evaluator (5) detects lock of the rotor (1) from signals of the plurality of sensors (S1, S2, S3), The positioning drive according to claim 1, wherein the positioning drive is stored as a zero position.