JPS63133893A - Driving means of spinning machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the field of drive means for textile machines.

[Conventional technology]

Conventional textile machine drive means that can control the machine starting speed and braking within a predetermined range include electromagnetic clutches and brakes that are specially configured to have speed-torque characteristics such as rapid machine starting. It has a cage-type induction motor. This induction motor is
Always run at a constant rotation speed. Pulse control of the clutches and brakes carried out by the electronic control system makes it possible to obtain the desired output speed, adjustable by the starter.

This type of drive means has several inherent drawbacks.

If the desired operating speed of the drive means is lower than the speed of the motor, significant slip and therefore significant friction losses occur on the clutch as well as the brake. The linings of the clutch and brake plates are subject to wear, requiring the application of special lubricants, requiring readjustment of the play between the friction surfaces of the plates, and requiring premature replacement of the linings.

Additionally, there is excessive grinding noise, both during starting and braking, due to the friction between the clutch and brake plate linings.

Another significant drawback of the above-mentioned drive means is that, in order to compensate for the friction losses occurring between the linings of the clutch plates,
It is necessary to make the induction motor sufficiently large. This not only increases the power consumption but also involves wasted motor running even when the textile machine is stopped for technical reasons, thus requiring a considerable non-power input from the supply mains. .

The large electromagnets used to operate these clutches and brake plates also involve significant power consumption.

In view of the above-mentioned drawbacks, it has been proposed that instead of electromagnetic clutches and brakes, an electromagnetic induction control system that provides a torque moment (. has been done.

However, the eddy currents generated by such drive means result in considerable heat generation and associated cooling requirements of the drive unit, as well as losses requiring a correspondingly increased motor performance. Moreover, this type of drive means requires considerable care in the manufacture of its parts.

If so, a direct current drive means is used, the output speed (actuation speed) of which is regulated by an electronic circuit that controls the supply voltage to the motor over its entire range. The disadvantages of this are the short life of the commutator segments and carbon plush and the high cost of purchase.

The present invention is intended to overcome the above-mentioned drawbacks of known textile machine drive means.

The problem to be solved by the present invention is an electronic control system that uses a conventional induction motor and maintains the performance of the motor at optimum operating conditions over a wide range of speeds without the use of auxiliary latching or braking elements. The object of the present invention is to design a drive means for a textile machine equipped with the following.

This problem is solved by the drive means of the invention, the principle of which is that the power source includes a rectifier connected by a switching regulator to a current protection circuit, which current protection circuit is connected to an energy accumulator connected to a bridge switch. , the output side of the bridge switch is connected to a drive motor of the textile machine, the drive motor comprising a control signal unit connected to a control unit, the control unit comprising a function preselection unit connected to a control microcomputer. , the microcomputer is connected on the one hand to the current protection circuit and on the other hand to an exciter, one output of the exciter being connected to the switching regulator and the other output being connected to the bridge switch. It is characterized by this.

Other advantages and features of the textile machine drive means according to the invention are:
It will be explained in more detail by the preferred embodiments shown in the accompanying drawings.

〔Example〕

The textile machine drive means comprises a conventional three-phase induction motor 2 connected to a voltage supply 1 of variable frequency and amplitude. This voltage supply device 1 includes a rectifier 10. Transistorized switching regulator 11. Current protection circuit 12. Energy accumulator 13. and a transistorized bridge switch 14, which is connected to the control unit 4.

The rectifier 10 consists of power rectifying diodes 12 to 17 in a bridge circuit, and the input side of the bridge circuit is connected to a terminal of a supply main line. Output terminals A and B are connected to a filter capacitor 101.

The output terminal B serves as a common pole for the rectifier 10 and other components of the voltage supply device.

Connected to the output terminal A is the collector of a switching transistor 110 that functions as a positive pole of a rectifier 10 that forms part of a transistorized voltage regulator 14 . The base of this switching transistor 110 is connected to the output of the exciter of the control unit 4 .

Further, the emitter of this switching transistor 110 is connected to the current protection circuit 12 and a bus bar (bunsbar) having a common anode.
s-bar) and the cathode of a protection diode 111 connected to the s-bar.

One of the output sides of the current protection circuit is connected to a control microcomputer 41, and the other output side is connected to a pair of switching transistors via an energy accumulator 13.
It is connected to the bridge switch 14 consisting of 41-146. Switching transistors 141, 143, 1
45 is connected to a terminal that functions as a positive and negative terminal of the energy accumulator 13. The components and lids of the switching transistors 142, 144, 146 are connected to each other, and the switching transistors 141, 143, 145
The emitters of switching transistors 142.14.
It is connected to 4,146 collectors. The emitter-collector connections C, D, and E of the pair of switching transistors described above are connected to the terminal plate of the three-phase induction motor 2 by conductors. The collector and emitter of each switching transistor 141-146 are bridged by a diode.

The base of each switching transistor 141-146 is connected to one of the corresponding outputs of the exciter 42 of the control unit 4. The exciter 42 is connected to the output side of the control microcomputer 41 by a conductor. A function pre-wi 351 selection unit 43 and a control J* signal unit 5 are connected to the microcomputer 41 .

The textile machine driving means described above operates as follows. When connected to the mains, the voltage supply device 1 is connected to the rectifier 10
DC voltage is generated at output terminals A and B of the The switching regulator 11 modifies the DC voltage value at its output by the signal coming from the control unit 4 . These signals are determined by switching frequency, pulse length, output cover/l<
The length of the idle period of the sumi pressure is specified, and the current protection circuit 1
2 and the choke coil 13 of the energy accumulator 13
1, it reaches the capacitor 132 and the bridge switch 14. This transistorized bridge switch 1
4, three pairs of switching transistors 141 to 146;
each pair connects one of the three terminals of the drive motor 2,
It is connected to either the positive or negative bus bar supplied by the energy accumulator 13 to generate therein an alternating voltage with adjustable frequency and amplitude. The switching action of each of the switching transistors 141 to 146 is controlled by a control microcomputer 41. That is, by means of the corresponding output of the exciter 42, a harmonic
It is controlled to produce a three-phase alternating current voltage that is both adjustable in frequency and amplitude. This control process is checked on the one hand by a program stored in the control computer 41 and on the other hand by a code from the circuitry of the control signal unit 5 to ensure that the machine operates in the desired mode. By preselecting the parameters in the functional preselection unit 43, the mode can be modified according to technical requirements without exceeding the maximum permissible load of the system. These parameters are checked by a current protection circuit 12 that photoelectrically checks the current value flowing from the transistorized switching regulator 11 to the bridge switch 14. , if the maximum allowable current value is exceeded, the control microcomputer 4
A signal arrives at the input terminal of the switching regulator 11 and shuts off the switching regulator 11. If a value greater than or equal to the maximum permissible current value continues for longer than a predetermined time, the current protection circuit 12 sends yet another signal to the control microcomputer 41, which moves the bridge switch 14 to the rest position.

The aforementioned textile machine drive means adjust the machine starting time, 9 rotational speed program, and braking speed over a wide range. This means controls the torque moment of the motor at various rotational speeds, making it possible, for example, to obtain torque characteristics of an induction motor similar to those of a series DC motor.

The textile machine drive means connected according to the invention limits the maximum permissible current value during starting and braking of the motor,
This eliminates the need for an extra circuit breaker.

[Brief explanation of the drawing]

The figure shows a control circuit for the drive means of the invention. 1--Voltage supply device, 2--Motor, 4--Control wholesale unit, 10--Rectifier, 11--Switching regulator, 12--Current protection circuit, 13--Energy accumulator, 41-- Microcomputer, 110-・Switching transistor, 141-146
-Switching transistor.

Claims (1)

[Claims] 1. A drive means for a textile machine such as a sewing machine, which is equipped with a control unit and a drive motor connected to an AC voltage supply means, the voltage supply device (1) having a current protection circuit (12) by a switching regulator (11). ), the current protection circuit (12) being connected to an energy accumulator (13) connected to a bridge switch (14), the current protection circuit (12) being connected to an energy accumulator (13) connected to a bridge switch (14);
The output side of 4) is connected to the textile machine (3), said drive motor (2) is characterized by a control signal unit (5) connected to a control unit (4), said control unit (4)
comprises a function preselection unit (43) connected to a control microcomputer (41), said microcomputer (41) being connected on the one hand to a current protection circuit (12) and on the other hand to an exciter (42). one output end of the exciter (42) is connected to the switching regulator (11), and the other output end is connected to the bridge switch (14). means.