System comprising an electrically excited machine

• US 9,425,723 B2
• Filed: 12/29/2011
• Issued: 08/23/2016
• Est. Priority Date: 02/10/2011
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Feuerstack, Peter, Weissenborn, Erik, Kessler, Martin
• Primary Examiner(s): DUDA, RINA I
• Application Number:
  US13/984,311
• Publication Number:
  US 20130320888A1
• Time in Patent Office: 1,699 Days
• Field of Search: 318/727, 318/801, 318/803
• US Class Current: 1/1
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: H02J 7/0025 Sequential battery discharge in systems with a plurality of batteries
• CPC Class Codes: H02J 7/1492 by means of controlling devices between the generator output and the battery
• CPC Class Codes: H02M 7/4835 comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
• CPC Class Codes: H02M 7/49 Combination of the output voltage waveforms of a plurality of converters
• CPC Class Codes: H02P 2209/01 Motors with neutral point connected to the power supply
• CPC Class Codes: H02P 25/024 controlled by supply frequency
• CPC Class Codes: H02P 6/14 Electronic commutators
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A system includes an n-phase separately excited electrical machine, wherein n≧1, and a controllable first energy store that has n parallel energy supply branches. Every energy supply branch includes a first connection that is connected to a respective phase connection of the electrical machine, and a second connection that is connected to a common reference bus. The reference bus is connected to a neutral point of the electrical machine via an exciter winding of the electrical machine.

Claims

1. A system comprising:

an n-phase separately excited electric machine, wherein n≧

1;

a controllable first energy store, which has n parallel energy supply branches, wherein each of the energy supply branches has a first terminal, which is connected in each case to a phase terminal of the electric machine, and a second terminal, which is connected in each case to a common reference rail, and an exciter winding that is connected to a star point of the electric machine and to the common reference rail to conduct current between the star point of the electric machine and the common reference rail, wherein the exciter winding receives current only via the star point of the electric machine.

2. The system as claimed in claim 1, wherein the potential at the star point of the electric machine is changed by increasing or decreasing voltages at the energy supply branches.

3. The system as claimed in claim 1, wherein each of the n parallel energy supply branches has at least two series-connected energy storage modules, which in each case comprise at least one electrical energy storage cell having an associated controllable coupling unit.

4. The system as claimed in claim 1, wherein as the exciter winding is connected directly between the star point of the electric machine and the common reference rail to conduct current.

5. The system as claimed in claim 1, wherein the system is free from an external motor connection.

6. The system as claimed in claim 1, wherein the exciter winding is directly connected to the common reference rail.

7. The system as claimed in claim 1, wherein the exciter winding is only provided energy by the first energy store.

8. A method for operating a system having an n-phase separately excited electric machine, wherein n≧

1, and a controllable first energy store, which has n parallel energy supply branches, the method comprising;

providing a DC voltage component to each of the energy supply branches;

feeding the DC voltage component into the phase terminals of the n-phase electric machine; and

supplying an exciter winding via a star point of the electric machine with the DC voltage component fed into the phase terminals in order to generate an excitation field in the electric machine,

wherein the exciter winding only receives the DC voltage component via the star point.

9. The method as claimed in claim 8, wherein each of the energy supply branches of the first energy store has at least two series-connected energy storage modules, which in each case comprise at least one electrical energy storage cell having an associated controllable coupling unit, and wherein providing the DC voltage component involves connecting at least one of the energy storage modules into the respective energy supply branch.

10. The method as claimed in claim 8, wherein the exciter winding generates the excitation field in the electric machine, and the exciter winding is connected to a common reference rail of the electric machine, the exciter winding conducting current between the star point and the common reference rail.

11. The method as claimed in claim 8, including

providing each of the energy supply branches with first terminals connected to a corresponding phase terminal of the n-phase electric machine, and

providing each of the energy supply branches with second terminals connected to a common reference rail, and

providing the common reference rail connected to the exciting winding of the electric machine.

12. A system comprising:

an n-phase separately excited electric machine, wherein n≧

1;

a controllable first energy store, which has n parallel energy supply branches, wherein each of the energy supply branches has a first terminal, which is connected in each case to a phase terminal of the electric machine, and a second terminal, which is connected in each case to a common reference rail, and an exciter winding that is connected to a star point of the electric machine and to the common reference rail to conduct current between the star point of the electric machine and the common reference rail, wherein one end of the exciter winding is connected directly to the star point of the electric machine and another end of the exciter winding is connected directly to the common reference rail, and wherein the exciter winding is only provided energy by the first energy store.