CS229458B1 - Wiring for synchronous motor positioning - Google Patents

Abstract

The invention falls into the field of electric motor control and solves the problem of oriented stop of a drive with a synchronous motor for automatic tool change by the fact that the logical signal of the request for oriented stop is, in addition to controlling the switch, to which in one position a source for specifying a variable speed of rotation is connected to the speed regulator and in the other position a source for specifying a constant speed of rotation, fed to one input of a combinational circuit, to whose other two inputs the response of the speed sensor and the signal of the position sensor are connected. In case of coincidence, the signal from one output of the combinational circuit blocks the switching of the elements of the actuator and from the other output it sets the current in the windings in the oriented stop state of the shaft.

Description

(54)

Connection for synchronous motor positioning

The invention falls within the field of control of electric motors and solves the problem of oriented stopping of the drive by a synchronous motor for automatic tool change by providing a directed stop request logic signal in addition to controlling a switch to which a power source is connected in one position to the speed controller. for inputting a variable rotation speed, and in the second position, the constant speed input source is coupled to one input of the combination circuit, the other two inputs of which are coupled to a speed sensor response and a position sensor signal. In the case of coincidence, the signal from one output blocks the combination circuit for switching the elements and the controller, and from the other output it enters the current in the windings in the state of oriented shaft stop.

(52) Int. Cl. ¹

H02P 3/18 H02K 37/00

229 458

229 458

BACKGROUND OF THE INVENTION The invention relates to a wiring for positioning a synchronous motor powered by an inverter, provided with a current regulator, a rotational speed regulator, a variable speed input source, a sensor thereof and a position sensor.

In some cases, the use of synchronous motor drives requires the shaft to stop rotating at a certain defined position, for example, an oriented stop of the boring machine spindle for automatic tool change.

Until now, such position stops of synchronous motor drives have been solved by moving at a low speed to the desired stop position and the motor is switched off when stopping. · Stopping the drive in this way in the desired position is very inaccurate ·

The object of the invention was to eliminate the above mentioned drawbacks of positioning of synchronous motors, which was achieved by the connection according to the invention, which is characterized in that the switch controlled by the signal of the drive demand source A is simultaneously connected to one input of the combination circuit. is coupled to a rotary encoder and a third position encoder input, one output of which is coupled to the inverter switching control circuit and the other output to the current regulator, a variable rotational speed input source is connected to the rotational speed regulator at one switch position; in the second position the constant speed input source · “3 229 458

Thus, when a certain minimum speed is reached, the rotor in the axis of these windings stops when the two phase windings are supplied with DC current. The position resolution is given by multiples of 60 ° electric. When using a 12-pole permanent ferrite magnet excitation motor on the motor axis, which with a 1: 10 transmission gives an accuracy of £ 0.5 ° mechanical on the spindle. With mechanical adjustment, this accuracy is fully sufficient.

An example of a wiring according to the invention is described below and its operation is explained with the aid of a drawing in which a switch P controlled by a drive stop source A signal is connected to a rotational speed controller R controlled by analog signals ZP for variable speed input or ZK to set a constant rotation speed to oriented drive stop. In addition to the rotational speed controller R, this drive-oriented demand source A source signal is applied to one of the inputs of the combination circuit KO, the other two inputs of which are the response of the rotation speed sensor Cr and the output of the position sensor Cp. A circuit d for controlling the inverter switching elements and a second current regulator I are connected to one of the outputs of the combination circuit KO.

The analog value from the ZK source for setting a constant rotation speed to the oriented stop of the drive adjusts the speed of the motor by the controller R so that the inertia rotor does not exceed the desired steady state position and does not unnecessarily oscillate around this position.

The oriented drive stop request logic signal is also applied to the combination circuit KO along with the rotation speed sensor response signal C to reach the positioning speed and the signal from the sensor Cp of the position in which the stop is requested.

When these three signals coincide at the inlet of the combination circuit KO, one of its outputs blocks the inverter switching circuit S and the other outputs outputs the winding current in the oriented stop state at the input of the current regulator I.

Claims (1)

p u Ň τ τ v v v a a a 229 459 A wiring for positioning a synchronous motor powered by an inverter equipped with a current regulator, a rotational speed regulator, a variable speed input source, its sensor and a position sensor, characterized in that the switch (?) Controlled by the drive's A-stop signal source. Simultaneously connected to one input of the combination circuit (KO), its second input is coupled to the rotation speed sensor (Cr) and the third input to the position sensor (Cp) and one output is connected to the circuit (S) for controlling the inverter switching elements. output 3 by the current regulator (I), the source (Z?) for setting the variable speed of rotation is connected to the rotational speed regulator (R) in one position of the switch (ø) and in the second position the source (ZK) for constant speed.