DE102014004282A1 - Method for operating a drive system and drive system for carrying out a method - Google Patents

Abstract

Method for operating a drive system and drive system for carrying out a method, wherein the drive system comprises an inverter can be fed from an energy storage, from which an electric motor can be fed, wherein a physical state variable of the energy storage, in particular the voltage provided by the energy storage device available voltage and / or the amount of energy stored in the energy store is detected and a movement is started when falling below a predetermined value, in particular a critical voltage value or a critical value of energy.

Description

The invention relates to a method for operating a drive system and a drive system for carrying out a method.

It is well known that in mains voltage supply failure by means of an uninterruptible power supply, so UPS, the power supply is maintained upright.

The invention is therefore based on the object of developing a method for operating a drive system, wherein a UPS is dispensable and still the safety is maintained.

According to the invention, the object is achieved in the method according to the features indicated in claim 1.

Important features of the invention in the method for operating a drive system are that the drive system has an inverter which can be fed from an energy store and from which an electric motor can be fed.
wherein a physical state variable of the energy storage device, in particular the voltage supplied by the energy storage device to the inverter and / or the amount of energy stored in the energy storage device is detected and a movement sequence is started when the value drops below a predetermined value, in particular a critical voltage value or a critical value.

The advantage here is that an uninterruptible power supply can be saved. Because the drive is supplied from the energy storage and is then turned on to perform the sequence of motions before the amount of energy stored in the energy storage falls below the amount of energy necessary for the execution of the movement process. Thus, the movement is triggered on the one hand by falling below a critical value provided for this purpose and on the other hand by a warning message generated by a higher-level control and / or risk warning message. In the presence of the mains supply so the movement is triggered only when the warning information arrives. In the absence of the mains supply so the movement is triggered when the amount of energy in the energy storage has decreased critical, so the amount of energy stored threatens to fall below the necessary amount of energy for the execution of the movement.

In an advantageous embodiment, when the predetermined value is exceeded and warning information arrives, in particular, such as notification of fire, fire, earthquake, danger of war, flood or other danger or risk, the course of motion is started. The advantage here is that in the presence of the power supply, the movement sequence to achieve protection is executed when a warning information arrives.

By way of example, the movement sequence is closing a gate and / or closing a firewall.

In an advantageous embodiment, a non-vanishing acceleration is specified at the start of the movement. The advantage here is that the engine is accelerated, especially the output speed.

In an advantageous embodiment, a time-variable speed or torque curve is specified as a movement of the electric motor. The advantage here is that the motor is accelerated, is subsequently stable to a speed and finally the speed is reduced. Instead of a target specification of speed, a specification of torque is executable.

In an advantageous embodiment, the movement takes at least four seconds and while the engine is operated at least one third of its rated power for at least more than one second. The advantage here is that the energy storage can absorb much more energy than a link capacitor, through which a sufficiently high DC link voltage only less than ten net period durations is maintained.

In an advantageous embodiment, a signal electronics generates control signals for the inverter and can be supplied from the energy store. The advantage here is that the DC link voltage drops when a mains voltage failure is present for a long time. Thus, however, depending on the amount of energy stored in the energy storage, the motion sequence is triggered. The critical downtime is determined on the one hand by the design of the energy storage and on the other hand by the power consumption of the signal electronics.

In an advantageous embodiment of the predetermined value is determined such that more energy is stored when starting the movement in the energy storage as necessary to carry out the movement sequence. The advantage here is that the movement is just completely executable.

In an advantageous embodiment of the energy storage regenerated energy is supplied in regenerative operation of the engine. The advantage here is that the energy consumption during operation is reduced.

In an advantageous embodiment, a warning message is displayed when starting the movement sequence and / or is transmitted via a communication channel to another device connected to the communication channel. The advantage here is that the power failure leads to the forwarding of a warning message, as long as enough energy in the energy storage to supply the signal electronics is available.

In an advantageous embodiment, the device driven by the motor is a gate and / or a firewall. The advantage here is that the danger is separable from the environment.

In an advantageous embodiment, the engine is not powered from an uninterruptible power supply. The advantage here is that in little costly manner when the danger of the drive is still operable to increase safety by the risk is separable.

Important features of the drive system for carrying out an aforementioned method are that the inverter can be supplied from an energy store and a sensor for detecting the physical state variable is connected to a signal electronics system which generates drive signals for the inverter. The advantage here is that

In an advantageous embodiment of the energy storage is dimensioned such that the necessary energy for the movement of the engine is ready adjustable. The advantage here is that the security can be increased.

In an advantageous embodiment of the energy storage, a DC link capacitor is connected in parallel. The advantage here is that the DC link voltage is smoothed.

In an advantageous embodiment of the energy storage from the AC power supply network via a rectifier and a rectifier and energy storage arranged DC / DC converter can be fed. The advantage here is that the charging current for the energy storage means of the DC / DC converter is controllable, in particular for charging or discharging.

In an advantageous embodiment, the inverter can be supplied directly or via the DC / DC converter from the energy store. It is advantageous for direct supply that the associated supply voltage can be controlled by means of the DC / DC converter, as long as the mains supply is maintained. An advantage of the supply via the DC / DC converter is that the voltage at the energy store may differ from the DC link voltage.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination options of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or the task posing by comparison with the prior art arise.

The invention will now be explained in more detail with reference to figures:

In the 1 a drive system operable according to the invention is shown.

In the 2 is shown another inventively operable drive system.

This is from an AC power supply network 1 which is single-phase or preferably three-phase, an AC / DC converter 2 , in particular rectifiers, fed, whose unipolar from the AC supply network 1 remote output voltage to a DC / DC converter 3 is supplied. In this way, a DC link voltage can be provided, which is provided by a DC link capacitor 6 supported, in particular smoothed, is.

In addition, the DC link capacitor 6 an energy store 4 electrically connected in parallel, so that a large amount of energy can be stored in the DC link.

The amount of energy stored is so great that the drive system can be operated at its rated power for at least several seconds, for example more than five seconds, when the AC power supply network 1 has failed.

The DC link voltage is an inverter 5 fed, whose remote from the DC link, in particular motor-side, AC voltage an electric motor 7 , in particular three-phase motor, feeds.

Thus, the electric motor 7 controllable variable speed by means of the AC voltage provided by the inverter.

For example, the engine drives a gate, especially a door or firewall. Thus, in case of security, especially in case of fire, the gate can be closed or apparently - depending on the respective security specification. For the movement of the gate in this case a control process is provided, so a movement. The movement includes at least an initial acceleration section and a final brake acceleration section. In between, an acceleration-free period of time can be arranged. The motor is controlled according to the movement sequence.

The necessary energy for the movement is stored in the energy storage.

The energy store is preferably made of electrically interconnected capacitors, in particular double-layer capacitors, and has a separate housing. Thus, the inverter 5 arranged in a different housing than the energy storage 4 ,

A means for detecting the energy storage 4 or at the DC link capacitor 6 voltage applied, in particular DC link voltage is connected to a signal electronics, which are the drive signals for the inverter 5 generated.

In the case of safety, that is, for example, after detection of fire, fire or the like, and / or falls below a critical voltage value by the voltage of the movement sequence is started.

Thus, in case of mains voltage failure and thus caused subsequent drop of the voltage below the critical voltage value, the movement sequence is started.

A UPS is thus unnecessary. In addition, the signal electronics can be supplied from the DC link. As a result of the associated energy decrease in the energy store, the voltage slowly decreases when there is a mains voltage supply failure.

In a further embodiment of the invention, instead of the gate, another device is to be driven by the drive system.

In the embodiment according to 2 is the inverter 5 although again on the input side from the on the DC link capacitor 6 supplied voltage, ie from the DC link voltage, but the input side of the DC / DC converter 3 is parallel to the DC link capacitor 6 arranged so that electrical power either from the DC link via the DC / DC converter 3 to the energy storage 4 is conductive or vice versa. In addition, in the presence of the mains supply voltage of the intermediate circuit can be fed by means of the AC / DC converter, in particular so the rectifier.

Thus, in normal operation, the energy storage 4 rechargeable from the DC link. The control electronics 20 generates corresponding control signals for the power semiconductor switch of the control electronics 20 , In case of failure of the mains supply voltage energy from the energy storage 4 fed into the DC link from which the signal electronics for generating the drive signals for the inverter 5 is available.

Once with the means for detecting the energy storage 4 voltage applied voltage or in the energy storage 4 existing energy quantity falls below a predetermined critical value, the movement sequence is started.

Advantage of the arrangement according to 2 is that by means of the DC / DC converter, the energy storage 4 Voltage applied independently of the DC link voltage is adjustable. The control electronics 20 of the DC / DC converter is for this purpose from the intermediate circuit or from the energy storage 4 provided.

In further embodiments of the invention, the control electronics 20 and the signal electronics designed as common signal electronics, either directly from the energy storage 4 or is supplied from the DC link.

LIST OF REFERENCE NUMBERS

1

AC power supply network, in particular three-phase

2

AC / DC converter, in particular rectifier

3

DC / DC converter

4

energy storage

5

inverter

6

Link capacitor

7

Electric motor, in particular three-phase motor

20

control electronics

Claims (15)

Method for operating a drive system, wherein the drive system comprises an inverter which can be fed from an energy store, from which an electric motor can be fed, characterized in that a physical state variable of the energy store, in particular the voltage provided by the energy store to the inverter and / or in the energy store stored energy amount is detected and falls below a predetermined value, in particular a critical voltage value or a critical Value of energy amount, a motion sequence is started. Method according to at least one of the preceding claims, characterized in that when the predetermined value is exceeded and upon arrival of warning information, in particular as notification of fire, fire, earthquake, danger of war, flood or other danger or risk, the movement sequence is started. Method according to at least one of the preceding claims, characterized in that at the start of the movement sequence a non-zero acceleration is specified. Method according to at least one of the preceding claims, characterized in that as a movement of the electric motor, a time-variable speed or torque curve is specified. Method according to at least one of the preceding claims, characterized in that the sequence of movements lasts at least four seconds, while the motor is operated at least one third of its rated power for at least more than one second. Method according to at least one of the preceding claims, characterized in that a signal electronics generates control signals for the inverter and from the energy storage and / or from the intermediate circuit, that is supplied from the voltage applied to the input side of the inverter voltage. Method according to at least one of the preceding claims, characterized in that the predetermined value is determined such that more energy is stored when starting the sequence of motion in the energy storage as necessary to carry out the movement sequence. Method according to at least one of the preceding claims, characterized in that regenerated energy is supplied to the energy store in regenerative operation of the motor. Method according to at least one of the preceding claims, characterized in that when starting the sequence of movements a warning message is displayed and / or transmitted via a communication channel to another device connected to the communication channel. Method according to at least one of the preceding claims, characterized in that the device driven by the motor is a gate and / or a firewall. Method according to at least one of the preceding claims, characterized in that the engine is not supplied from an uninterruptible power supply. Drive system for carrying out a method according to at least one of the preceding claims, characterized in that the inverter can be supplied from an energy store and a sensor for detecting the physical state variable is connected to a signal electronics, which generates drive signals for the inverter. Drive system according to at least one of the preceding claims, characterized in that the energy storage is dimensioned such that the necessary energy for the movement of the motor is adjustable and / or that the power storage, an intermediate circuit capacitor is connected in parallel. Drive system according to at least one of the preceding claims, characterized in that the energy store can be fed from the AC power supply network via a rectifier and a DC / DC converter arranged between rectifier and energy store. Drive system according to at least one of the preceding claims, characterized in that the inverter can be supplied directly or via the DC / DC converter from the energy store.

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