CN-114123156-B - Spinning machine

Abstract

Spinning machine comprising a plurality of workstations with an electric drive, in particular a DC motor, and at least two DC voltage sources with voltages U1 and U2, each forming a DC voltage network N1 and N2. At least three DC voltage rails for powering a plurality of drives, in particular DC motors, are connected to at least two DC voltage sources in such a way that a first DC voltage rail is operatively connected to the first DC voltage source, a second DC voltage rail is operatively connected to the second DC voltage source, and a third DC voltage rail is operatively connected to the first DC voltage source and the second DC voltage source. In particular the current collectors of the plurality of drives of the DC motor are optionally connected to the first DC voltage rail and the third DC voltage rail or to the second DC voltage rail and the third DC voltage rail. The two DC voltage networks N1 and N2 are operatively connected to a voltage equalizing device to compensate for the voltage difference in the two DC voltage networks N1 and N2.

Inventors

• B. Ingold
• E. Fafro

Assignees

• 里特机械公司

Dates

Publication Date

20260512

Application Date

20210830

Priority Date

20200831

Claims (11)

1. 1. A spinning machine, which comprises a spinning frame, With a plurality of work stations with electric drives, in particular DC motors (10, 11, 19), With at least two DC voltage sources (2.1, 2.2), the at least two DC voltage sources (2.1, 2.2) having voltages U1 and U2, Each of the at least two DC voltage sources (2.1, 2.2) forms a DC voltage network N1 and N2, -Wherein at least three DC voltage rails (3, 4, 7) for powering a plurality of drives, in particular the DC motors (10, 11, 19), are connected to the at least two DC voltage sources (2.1, 2.2) in the following manner: o a first DC voltage rail (3) is operatively connected to said first DC voltage source (2.1), O a second DC voltage rail (4) operatively connected to said second DC voltage source (2.2), and -A third DC voltage rail (7) operatively connected to said first DC voltage source (2.1) and said second DC voltage source (2.2), -And wherein the current collectors of a plurality of said drives, in particular said DC motor (19), are optionally connected to said first DC voltage rail (3) and said third DC voltage rail (7), or to said second DC voltage rail (4) and said third DC voltage rail (7), characterized in that two DC voltage networks N1 and N2 are operatively connected to voltage equalizing means (18) to compensate for a voltage difference in said two DC voltage networks N1 and N2.
2. 2. Spinning machine according to the preceding claim, characterized in that a frequency converter (25, 26) is assigned as the voltage equalizing device (18) to each of the DC voltage networks N1 and N2, and in that the frequency converter (25, 26) is connected on the output side to an isolation transformer (27).
3. 3. Spinning machine according to one or more of the preceding claims, characterized in that it has a workstation on both sides and a DC voltage network N1 or N2 is distributed to said workstation on one side (22, 23).
4. 4. Spinning machine according to one or more of the preceding claims, characterized in that it is divided into sectors (24 'to 24N) in each of which a plurality of work stations are arranged, and one DC voltage network N1 or N2 is each alternately allocated to an adjacent sector (24' to 24N).
5. 5. Spinning machine according to one or more of the preceding claims, characterized in that it has workstations on both sides and is subdivided into sectors (24 ' to 24N), in each of which sectors (24 ' to 24N) a plurality of workstations are arranged, and one DC voltage network N1 and N2 are each alternately assigned to opposite sides (22, 23) and to adjacent sectors (24 ' to 24N).
6. 6. Spinning machine according to one or more of the preceding claims, characterized in that a further drive, in particular a DC motor (10, 11), is connected to said first DC voltage rail (3) and said second DC voltage rail (4).
7. 7. Spinning machine according to one or more of the preceding claims, characterized in that at least one inverter with at least one AC motor and/or one DC voltage transformer (15) for a further voltage U4 are arranged on both of said DC voltage rails (3, 4, 7).
8. 8. Spinning machine according to one or more of the preceding claims, characterized in that said isolation transformer (27) is a high-frequency transformer.
9. 9. Spinning machine according to one or more of the preceding claims, characterized in that said frequency converters (25, 26) have braking resistors (28, 29) in order to limit the voltage peaks.
10. 10. Spinning machine according to one or more of the preceding claims, characterized in that said two DC voltage networks N1 and N2 have symmetrical resistors (8, 9) in order to obtain the basic level of said DC voltage networks N1 and N2.
11. 11. Spinning machine according to one or more of the preceding claims, characterised in that said two DC voltage networks N1 and N2 are polarised in opposite directions.

Description

Spinning machine Technical Field The invention relates to a spinning machine with a plurality of workstations with an electric drive, in particular a DC motor, with at least two DC voltage sources with voltages U1 and U2, each forming a DC voltage network N1 and N2, wherein at least three DC voltage rails are connected to the at least two DC voltage sources for powering a plurality of drives, in particular DC motors, in such a way that a first DC voltage rail is electrically operatively connected to the first DC voltage source, a second DC voltage rail is electrically operatively connected to the second DC voltage source, and a third DC voltage rail is electrically operatively connected to the first DC voltage source and the second DC voltage source, and wherein a current collector of the plurality of drives, in particular the DC motor, is optionally connected to the first and third DC voltage rails or to the second DC voltage rail and the third DC voltage rail. Background EP 1927686 A2 discloses a spinning machine with an electric drive and an electric supply for an electric motor with a DC voltage and an AC voltage source. At least one transformer is connected to the alternating voltage network. Since a large number of very different designed motors are used in spinning machines, special attention must be paid to the individual requirements of the different motors and to the power distribution on the machine when designing the power supply. The patent therefore proposes to design the energy supply in the spinning machine in such a way that the existence of the ideal voltage conditions depends on the type of motor and its position in the machine. For this purpose, two rectifier groups are connected to the two secondary transformer windings, each of the two rectifier groups being connected to two DC voltage rails, one of which is common to the two rectifier groups, so that three DC voltage rails are available. There are a variety of direct voltages between the rails, particularly 270 volts DC (direct current) and 540 volts DC. By the described energy supply concept, motors in spinning machines can be supplied with different voltages and operated with very high efficiency. In particular, the motor for driving various functional units in the spinning machine (e.g., draft rollers or ring frame lift drives) can be supplied at 540 volts DC. In particular, other motors (e.g., motors provided to drive spindles) may operate at 270 volts DC. The other motors are still connected to an AC voltage network, for example 400 volts DC. For example, these motors drive doffers or suction systems. The higher level controller is connected to the 540 volt DC voltage grid at 24 volts DC via a voltage converter. In case of a grid fault or a significant voltage drop, the corresponding speed setting reduction is transmitted to all drives via the bus. The motor connected to the bus enters a generator mode in which the energy stored in the rotating mass is converted into electrical energy due to the reduction in speed and fed to all consumers in a common intermediate circuit. In the case of asymmetric loading, there is the problem, for example, when a single spindle is not operating or when there is a voltage drop. When the voltage decreases, the current increases and there is a risk that the power supply is no longer sufficient. This is to be prevented. Disclosure of Invention It is therefore an object of the present invention to provide a consistent voltage for all consumers. This object is achieved by a spinning machine with the features of claim 1. According to the invention, the spinning machine has a plurality of work stations with electric drives, in particular DC motors. At least two DC voltage sources for voltages U1 and U2 each form a direct voltage network N1 and N2. At least three DC voltage rails are connected to at least two DC voltage sources for powering a plurality of drives, in particular DC motors. The first DC voltage rail is connected to a first DC voltage source, the second DC voltage rail is connected to a second DC voltage source, and the third DC voltage rail is operatively connected to the first DC voltage source and the second DC voltage source. The two DC voltage networks N1 and N2 are preferably polarized differently, for example, such that a voltage U1 of +270 volts is present in the DC voltage network N1 and a voltage U2 of-270 volts is present in the DC voltage network N2. The current collectors of the plurality of drives, in particular the DC motor, are optionally connected to the first DC voltage rail and the third DC voltage rail or to the second DC voltage rail and the third DC voltage rail. The two DC voltage networks N1 and N2 are electrically operatively connected to a voltage equalizing device in order to compensate for a voltage difference in the two DC voltage networks N1 and N2. The voltage equalization means ensure that even in the event of a voltage drop in the DC voltage network, or if a