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DE-102024133137-A1 - Machine arrangement and vehicle

DE102024133137A1DE 102024133137 A1DE102024133137 A1DE 102024133137A1DE-102024133137-A1

Abstract

A machine arrangement (20) comprises an electric machine (31), a first inverter (41), a second inverter (42), and a control device (90), wherein the electric machine (31) has a stator arrangement (33) and a rotor arrangement (34), wherein the winding arrangement (36) has a first partial winding arrangement (50) and a second partial winding arrangement (60), wherein the first winding arrangement (50) has three first windings (51, 52, 53) connected in a star configuration and having three first terminals (56, 57, 58), wherein the second winding arrangement (60) has three second windings (61, 62, 63) connected in a delta configuration and having three second terminals (66, 67, 68), and wherein the control device (90) is configured to control the first inverter (41) and the second inverter (42) to control such that the voltage profile at one of the first windings (51, 52, 53) and the voltage profile at one of the second windings (61, 62, 63) have a first phase difference, wherein the control device (90) is designed to allow a variable specification of the first phase difference.

Inventors

  • Wolfgang Maximilian Blaschke
  • Raphael Oestreicher

Assignees

  • DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20241113

Claims (11)

  1. Machine arrangement (20) comprising an electric machine (31), a first inverter (41), a second inverter (42), and a control device (90), whereby the electric machine (31) comprises a stator arrangement (33) and a rotor arrangement (34), whereby the stator arrangement (33) comprises a stator core (35) and a winding arrangement (36), whereby the winding arrangement (36) comprises a first partial winding arrangement (50) and a second partial winding arrangement (60), whereby the first winding arrangement (50) comprises three first windings (51, 52, 53) connected in a star configuration and having three first terminals (56, 57, 58), whereby the second winding arrangement (60) comprises three second windings (61, 62, 63) connected in a delta configuration and having three second terminals (66, 67, 68), whereby the first connections (56, 57, 58) are each connected to the first inverter (41), whereby the second connections (66, 67, 68) are each connected to the second inverter (42), whereby the control device (90) is configured to control the first inverter (41) and the second inverter (42) such that the voltage profile at one of the first windings (51, 52, 53) and the voltage profile at one of the second windings (61, 62, 63) exhibit a first phase difference, wherein the control device (90) is configured to allow a variable specification of the first phase difference.
  2. Machine arrangement (20) according to Claim 1 , in which the first inverter (41) and the second inverter (42) are designed as pulse inverters.
  3. Machine arrangement (20) according to one of the preceding claims, wherein the control device (90) is configured to determine the first phase difference as a function of the current operating point of the electrical machine (31).
  4. Machine arrangement (20) according to Claim 3 , in which the control device (90) is configured to determine the current operating point as a function of at least one parameter from a parameter group consisting of: - rotational speed of the rotor arrangement (34), and - torque of the electric machine (31).
  5. Machine arrangement (20) according to one of the preceding claims, wherein the control device (90) is configured to determine the first phase difference by an optimization method.
  6. Machine arrangement (20) according to Claim 5 , in which the optimization procedure is designed to minimize the total electrical power of the first inverter (41) and the second inverter (42).
  7. Machine arrangement (20) according to Claim 5 or 6 , in which the optimization procedure is designed to increase the torque of the electric machine (31).
  8. Machine arrangement (20) according to one of the preceding claims, wherein the stator core (35) has slots (44), the first windings (51, 52, 53) and the second windings (61, 62, 63) extend through the slots (44).
  9. Machine arrangement (20) according to Claim 8 , in which at least one of the first windings (51, 52, 53) and one of the second windings (61, 62, 63) extend through at least part of the slots (44).
  10. Machine arrangement (20) according to Claim 9 , in which in at least one part of the slots (44) the second winding (61; 62; 63) is arranged closer to the air gap (95) than the first winding (51; 52; 53).
  11. Vehicle (10) comprising a machine arrangement (20) according to one of the preceding claims.

Description

The invention relates to a machine arrangement and a vehicle. The DE 10 2016 012 876 A1 Figure 1 shows an electric machine with two three-phase winding arrangements, each supplied by an associated inverter. The winding arrangements can be connected in a star or delta configuration. The DE 10 2018 221 455 A1 shows an electric machine with two three-phase winding arrangements, one of which is connected in a star connection and one in a delta connection. The DE 10 2014 224 432 A1 shows an electric machine with two three-phase winding arrangements, one of which is connected in a star connection and one in a delta connection. The CN 104 953 743 A shows an electronic multi-speed motor with variable speed and a corresponding control system. It is therefore an object of the invention to provide a new machine arrangement and a new vehicle. This problem is solved by the subject matter of claim 1 and the dependent claim. A machine arrangement comprises an electric machine, a first inverter, a second inverter, and a control device, wherein the electric machine has a stator arrangement and a rotor arrangement, wherein the stator arrangement has a stator core and a winding arrangement, wherein the winding arrangement has a first partial winding arrangement and a second partial winding arrangement, wherein the first winding arrangement has three first windings connected in a star configuration and has three first terminals, wherein the second winding arrangement has three second windings connected in a delta configuration and has three second terminals, wherein the first terminals are each connected to the first inverter, wherein the second terminals are each connected to the second inverter, wherein the control device is configured to control the first inverter and the second inverter such that the voltage waveform at one of the first windings and the voltage waveform at one of the second windings have a first phase difference, wherein the control device is configured to allow a variable setting of the first phase difference. A star connection allows for higher torque than a delta connection, while a delta connection allows for increased power. A combination of these connections expands the operating range of the electric machine. Variable phase difference enables optimization of the electric machine's characteristics. Additionally, the continuous power output of the electric machine can be increased. According to a preferred embodiment, the first inverter and the second inverter are designed as pulse inverters. According to a preferred embodiment, at least one of the inverters is designed as a multi-stage inverter. A multi-stage inverter enables a reduction in power loss, particularly at low power levels or in the case of a periodic signal with low voltage. According to a preferred embodiment, at least one of the inverters is designed as a two-stage inverter. Two-stage inverters require a small number of semiconductor switches and are simple to control. According to a preferred embodiment, the control device is configured to determine the first phase difference as a function of the current operating point of the electrical machine. A phase difference that is advantageous depends on the current operating point. Therefore, determining the phase difference as a function of the operating point is advantageous. According to a preferred embodiment, the control device is configured to determine the current operating point as a function of at least one parameter from a parameter group consisting of: - Rotational speed of the rotor assembly, and - Torque of the electric machine. These parameters, individually and especially in combination, are well suited for determining the operating point. According to a preferred embodiment, the control device is configured to determine the first phase difference using an optimization method. This allows for optimization depending on the current operating point. According to a preferred embodiment, the optimization method is designed to minimize the total electrical power of the first inverter and the second inverter. This means the electric machine requires less electrical power. According to a preferred embodiment, the optimization method is designed to increase the torque of the electric machine. This allows the torque to be increased, for example, in maximum ranges. According to a preferred embodiment, the stator core has slots, with the first windings and the second windings extending through the slots. This results in an assignment of the phases. According to a preferred embodiment, at least one of the first windings and one of the second windings extend through at least a portion of the slots. This allows the windings to be well distributed across the stator. According to a preferred embodiment, in at least some of the slots the second winding is arranged closer to the air gap than the first winding. This results in a homogeneous temperature distribution within the slot. A vehicle feat