DE4441757B4 - Method for transmitting data from a moving part of a long stator drive to stationary devices of the long stator drive - Google Patents

Abstract

Method for controlling a vehicle drive, comprising a stator having stationary stator windings and arranged in the vehicle excitation magnets,
wherein data is transmitted from the vehicle to control the drive currents of a three-phase power supply,
characterized,
that the data transmitted via induced fields in the exciter magnet by induction of voltages in the long stator and
in that, based on the data, the currents of the three-phase supply supplying the long stator are regulated in magnitude, phase and frequency.

Description

The invention relates to a method for transmitting data from a moving part of a long stator drive to stationary devices of the long stator drive, cf. DE 37 22 295 A1 . DE 31 40 169 C2 ,

The transmission of data between a moving part of a long stator drive and his stationary Facilities takes place in the known case via data lines. This is but very expensive.

task the present invention is therefore to provide a method when operating a long stator drive in all speed ranges no data transmission equipment between the moving part and the stationary facilities required are.

The The object is achieved by the Characteristics of claim 1 solved. Advantageous embodiments of the invention are described in the further claims.

at the method according to the invention The data from the moving part to the stationary devices Langstatorantriebs by generating alternating fields in the Excitation magnets and induction of voltages transmitted in the long stator. This eliminates additional Polradwinkel detection devices, in particular also data transmission devices from the moving part to the stationary devices. Such a procedure is therefore particularly advantageous in magnetic levitation vehicles used. By saving data transmission equipment simplified between driving tool and feeding device in the substation the constructive structure considerably.

One The method of claim 2 or 4 allows - in addition to the data transfer - throughout Speed range - so even at 0 km / h - one Operation of the long stator drive without feeding direct current or of low frequency electricity. This eliminates the necessary Transformer bridges. Furthermore, a high voltage clamping or a feed by means of voltage source of constant frequency (synchronous machine) possible.

Further Advantages and details of the invention will become apparent from the following Description of an embodiment with reference to the drawings and in conjunction with the other claims. It demonstrate:

1 an arrangement of excitation magnets and long stator in a magnetic levitation vehicle, wherein in the lower part of the local course of the exciter field at time t ≤ t _{1 is} shown,

2 the temporal course of the exciter field with superimposition of a constant frequency f _W on the positive pole excitation magnet "

3 the induced voltages at constant excitation field frequency f _W in the arrangement 1 .

4 the temporal thrust force course.

In 1 is with 1 denotes a three-phase long stator drive. The longstator 1 carries a stator winding 2 , wherein the phases of the stator winding 2 with R and S and T are designated. Along the longstator 1 moves a vehicle whose direction is marked with an arrow. The vehicle has positive pole magnet magnets 3 as well as negative pole exciter magnets 4 on. A positive pole magnet 3 and a negative pole excitation magnet 4 together define the length of the pole pitch p.

• – die Frequenz beträgt f_W;
• – zum Zeitpunkt t₀ beträgt der Winkel des Strom-Raumzeigers φ₀ bei positiver Schubkraft bzw. φ₁ bei negativer Schubkraft,
• – zum Zeitpunkt t₁ beträgt der Winkel des Strom-Raumzeigers φ₁ bei positiver Schubkraft bzw. φ₀ bei negativer Schubkraft,
• – die Drehrichtung ist positiv bei positiver Schubkraft und negativ bei negativer Schubkraft.

Will be in the in 1 illustrated Langstatorantrieb the supporting field B _T (magnetic field) of the exciter magnets at standstill of the vehicle a frequency f _W superimposed, then be in the stator windings 2 of the longstator 1 AC voltages induced. By evaluating these voltages in the drive control in the substation, a pulsating space vector with a fixed phase position is obtained ( 3 ). Thus, by means of the existing converter, a three-phase current with the following properties can be fed into the long stator:

• The frequency is f _W ;
• - at time t _{0 is} the angle of the current space vector is φ ₀ for positive thrust and φ ₁ for negative thrust force,
• At the time t ₁ , the angle of the current space vector φ _{1 is} at a positive thrust force or φ ₀ at a negative thrust force,
• - The direction of rotation is positive with positive thrust and negative with negative thrust.

Thus, the current moves synchronously to an apparent vehicle speed v _W corresponding to the frequency f _W. This operation is referred to as apparent synchronous in the following. The resulting thrust curve shows 4 ,

• – f_W ist groß genug, um die Tragregelung nicht zu beeinflussen und so groß, daß die Auswirkungen der pulsierenden Kraftwirkung durch die Masse, die Federung und die Dämpfung der Magnetpolaufhängung sowie des Fahrzeugkastens weitgehend weggedämpft werden,
• – f_W ist klein genug, so daß keine unnötig große Blindleistung im Langstator 1 erzeugt wird und der Umrichter frequenzmäßig nicht überbelastet wird.

The choice of the frequency f _W is based on the following criteria:

• - f _W is large enough not to affect the carrying control and so large that the effects of the pulsating force effect by the mass, the suspension and the damping of the magnetic pole suspension and the vehicle body are largely damped away,
• - f _W is small enough so that no unnecessarily large Reactive power in the long stator 1 is generated and the frequency converter is not overloaded.

A frequency that meets these conditions, for example, f _W = 200 Hz.

After the vehicle has been set physically to move, the actual vehicle speed v _F adds proportional frequency f _F to the frequency f _W, that is, the oscillating voltage is running at f _F to. Two alternatives for operating the long stator drive can then be used.

In the first alternative, f _{W is} lowered, so that the total frequency f = f _W + f _F remains constant. The current can then be superimposed synchronous shares. By increasing the actual vehicle speed of the long stator thus runs the latest one at f = f _F to the synchronous operation.

In the second alternative, the translucent synchronous operation is in accordance with f = f + f _{F W} retained by increasing the supply frequency. After reaching a predetermined switching frequency = f _U can be switched to synchronous operation, preferably this happens z. B. at Statorabschnittswechsel.

Claims (5)

Method for controlling a vehicle drive, comprising a stationary stator windings long stator and arranged in the vehicle exciter magnets, wherein data from the vehicle to control the drive currents of a three-phase power supply are transmitted, characterized in that the data generated in the excitation magnet alternating fields by induction of voltages in the long stator and that based on the data, the currents of the three-phase supply supplying the long-stator are regulated in magnitude, phase and frequency. Method according to claim 1, characterized in that that the transferred Data induced in the spaced stator windings R, S, T AC voltages are, by means of which regulated the long stator feeding currents in particular, from the induced AC voltages a space vector with a fixed phase position is determined. The method of claim 2, wherein the positive pole fields of the exciter magnets with a predetermined frequency f _P and the negative pole fields of the exciter magnets ( 3 . 4 ) are overlaid with another predetermined frequency f _M , so that results in the stationary devices of the Langstatorantriebs by vectorial addition of the induced voltage amounts with weighting with the local induction curve and in consideration of the given by the frequency sign of Polradspannungs space vector, and therefrom the Polradwinkel is determined. The method of claim 2, wherein the alternating field at the same time serves as exciter field for thrust generation. The method of claim 1, wherein the plus pole and minus pole magnets ( 3 . 4 ) are superimposed with a common alternating field, and wherein a) the amplitude across the positive pole magnet ( 3 ) is maximum when the amplitude above the negative pole magnet ( 4 ) is minimal and vice versa, b) the alternating field is amplified or interrupted in time and c) the alternating field at the positive pole magnet ( 3 ) always begins with the same edge after the interruption, so that thereby the sign of the poles is determinable d) in the stationary devices of the long stator drive by vectorial addition of the induced voltage amounts with the local induction curve and observing the c) determined sign of the Polrad voltage space vector results and from the Polradwinkel is determined.