DE102009007959A1 - Electric motor system, has electric motor with stator windings provided with winding taps from which primary side of transducer i.e. inductive transducer, is supplyable, where load is supplyable from secondary side of transducer - Google Patents

Abstract

The system has an electric motor with stator windings provided with winding taps from which a primary side of a transducer i.e. inductive transducer, is supplyable, where load (V) is supplyable from a secondary side of the transducer. The motor and the transducer are formed as single-phase or as multi-phase. The transducer is designed as a transformer. A primary winding of the transducer is fed from a static inverter (ST) that is fed from an electric rectifier (GR) and directly supplied from the winding tap.

Description

The The invention relates to a system comprising an electric motor.

It is known to provide low voltage to consumers , where the low voltage from a medium voltage or High voltage is generated. This uses transformers their primary side the higher one Stress are exposed to us thus need a Berührschutz.

Under Low voltage is understood in the following to mean a voltage whose Rms value is so small that no contact protection is necessary. For example is the value of low voltage is less than 50 volts.

Of the The invention is therefore based on the object of developing a system, in which a low voltage for a consumer is generated.

According to the invention Task in the system according to the features specified in claim 1 solved.

Important features of the invention in the system are that it comprises an electric motor, which is fed from an inverter, which is arranged to be powered from an energy store,
wherein the electric motor comprises stator windings,
wherein the stator windings each have a winding tap,
from which the primary side of a transformer, in particular inductive transformer, can be supplied, from the secondary side of a consumer can be supplied.

From The advantage here is that by means of the winding tap a low-voltage consumer a stator winding of the motor is supplied. In this way So no voltage adapting transformer is necessary. One additionally used transformer is suitable for galvanic isolation. But since the primary side used frequency very high selectable is because they are independent is selectable from the supply frequency of the motor is the transformer to galvanic separation very small and compact executable. For lowering the tension is not additional measure or a corresponding means necessary.

at an advantageous embodiment, the motor, in particular stator, and the transformer single-phase accomplished or the engine and the transformer executed multiphase. It is advantageous that the invention is independent of the phase number of the Motors executable is.

at In an advantageous embodiment, the transformer is a transformer. The advantage here is that it is inexpensive, space-saving and powerful executable and also makes a galvanic separation can be produced.

at In an advantageous embodiment, the winding tapping is such executed that the RMS value applied to the primary winding of the transformer Tension at least five times, especially more than ten times, is smaller than the RMS value the voltage supplying the motor, in particular three-phase voltage or AC voltage. The advantage here is that no additional Means for lowering the voltage is necessary.

at an advantageous embodiment, the primary winding of the transformer powered by a power converter that fed from a rectifier which is supplied from the winding tapping. Advantageous This is to make it easier to provide the low voltage and cheaper Way allows is.

at an advantageous embodiment provides the secondary winding of the transformer a rectifier from which the consumer can be supplied. From The advantage here is that simple and inexpensive means can be used.

at According to an advantageous embodiment, the primary winding is supplied directly from the winding tapping. The advantage here is that in a simple way a power supply is ready adjustable.

at An advantageous embodiment is from the secondary winding of the transformer supplies a rectifier, from which a buck converter supplied is, from its output voltage, in particular from its rectified and smoothed Output voltage, the consumer can be supplied. Is an advantage doing that, a regulated or controlled voltage for the consumer is ready adjustable.

at In an advantageous embodiment, the consumer is galvanic separated from the stator windings of the motor. It is advantageous that high security can be guaranteed is.

at In an advantageous embodiment, the consumer is a low-voltage consumer is. The advantage here is that no contact protection is necessary.

In an advantageous embodiment, the power converter or the step-down converter can be operated or regulated in such a way that the voltage available to the load is regulated to a desired value. The advantage here is that even with fluctuating or unstable primary voltage as constant as possible voltage the consumer is available.

at an advantageous embodiment is the secondary side means for detection the voltage, in particular the voltage at the consumer, provided. The advantage here is that a control towards a set value executable is not just a controller.

at According to an advantageous embodiment, the detected values are voltage a signal electronics fed, with the the drive signals for generated by the converter or buck converter switch in particular, the transmission being the values above a galvanic isolation takes place. The advantage here is that the Consumer a low voltage is available without that a touch protection necessary is.

at an advantageous embodiment is the rms value of the consumer applied voltage at least five times, in particular more than ten times, less than the RMS value of the voltage feeding the motor, in particular three-phase voltage or alternating voltage. Is an advantage doing that, no contact protection necessary is.

Further Advantages emerge from the subclaims.

LIST OF REFERENCE NUMBERS

• M

  Electric motor with three-phase winding

  V

  consumer

  WR

  inverter

  GR

  rectifier

  TS

  Buck converter

  ST

  power converters

The invention will now be explained in more detail with reference to figures:
In the 1 a first device according to the invention is shown as a schematic circuit diagram. In 2 For this purpose, an alternative embodiment is shown.

In 1 an electric motor M is designed with three-phase winding and is powered by an inverter from an energy storage, such as a capacitor or a battery. This is a high voltage to the energy storage, for example, 500 volts or more. Thus, the high voltage is ten times or more above the low voltage range and requires contact protection. It must therefore be carried out in this area suitable insulation.

At the stator windings of the motor M, a winding tap is performed, ie a partial voltage led out on each stator winding. From this a rectifier GR is fed whose output voltage via a smoothing capacitor fed to a power converter ST is so that its output voltage or output current to a Setpoint is adjustable.

On this way becomes a primary winding a transformer from the power converter ST fed such that the at the secondary winding applied voltage the desired Value achieved. The secondary winding in turn feeds a rectifier GR, from which via a smoothing capacitor a consumer V can be supplied with DC voltage. This DC voltage is a low voltage, so that no contact protection is necessary. Between the Low voltage range and the high voltage range is therefore one galvanic isolation before.

to Improving the scheme is a detection of an electrical Size, like Voltage or current, secondary side or primary side executable by the transformer, so that this value by means of appropriate control of the power converter ST can be regulated to a desired value.

In 2 an alternative embodiment is executed. In this case, in turn, the motor M is supplied via an inverter WR from an energy store, which has high voltage HS.

In turn a winding tap is performed on the stator windings, the however directly the primary side of a three-phase transformer, whose secondary side in turn fed to a rectifier GR is, so that a buck converter TS is fed, at the one Output side over one smoothing capacitor a consumer is feedable.

On This way is now again the consumer with low voltage supplied and galvanically isolated from the high voltage side.

If in the embodiment according to 2 Instead of the three-phase motor, a single-phase operable AC motor is used, is in a similar manner instead of the three-phase transformer a single-phase transformer as in 1 usable.

Advantageously, works in the embodiments 1 and 2 the actuator, which includes a switch, at a much lower potential than the high voltage supplied potential from which the electric motor is powered. A switch encompassed by the step-down converter or power converter is thus advantageously designed as a semiconductor switch which is driven in a clocked manner at a high frequency. Therefore, the losses are low and the control properties are good. In addition, at high frequencies of the transformer, so inductive transformer, very compact executable and thus space can be saved.

Claims (14)

System comprising an electric motor, which is fed from an inverter, which is arranged to be powered from an energy store, wherein the electric motor stator windings, characterized in that the stator windings each have a winding tap from which the primary side of a transformer, in particular inductive transformer, can be supplied from whose secondary side a consumer can be supplied. System according to at least one of the preceding Claims, characterized in that the motor, in particular stator, and the transformer single phase or the engine and the transformer executed multiphase are. System according to at least one of the preceding Claims, characterized in that the transformer is a transformer is. System according to at least one of the preceding Claims, characterized in that the winding tap is made such that the rms value of the primary winding the transmitter applied voltage at least five times, in particular more than ten times, smaller than the rms value of the motor feeding Voltage, in particular three-phase voltage or alternating voltage. System according to at least one of the preceding Claims, characterized in that the primary winding of the transformer powered by a power converter, which consists of a rectifier is fed, which is supplied from the winding tapping. System according to at least one of the preceding Claims, characterized in that the secondary winding of the transformer supplies a rectifier, from which the consumer can be supplied is. System according to at least one of the preceding Claims, characterized in that the primary winding directly from the winding tapping is supplied. System according to at least one of the preceding Claims, characterized in that from the secondary winding of the transformer a rectifier is supplied, from which a buck converter supplied is, from its output voltage, in particular from its rectified and smoothed Output voltage, the consumer can be supplied. System according to at least one of the preceding Claims, characterized in that the consumer is galvanically isolated is from the stator windings of the motor. System according to at least one of the preceding Claims, characterized in that the consumer is a low-voltage consumer is, in particular so no contact protection necessary is. System according to at least one of the preceding Claims, characterized in that the power converter or the buck converter controlled or regulated so that the consumer to disposal adjusted voltage to a setpoint. System according to at least one of the preceding Claims, characterized in that on the secondary side a means for detection the voltage, in particular the voltage at the consumer, provided is. System according to at least one of the preceding Claims, characterized in that the detected values of voltage Signal electronics can be fed are with which the drive signals for the power converter or Step-down converter included switches are generated, in particular being the transmission the values above a galvanic isolation takes place. System according to at least one of the preceding Claims, characterized in that the rms value of the consumer applied voltage at least five times, in particular more than ten times, smaller than the rms value of the motor feeding Voltage, in particular three-phase voltage or alternating voltage.