DE102008034670A1 - Double-ended inverter drive system for e.g. a two-wheel drive sedan has two inverters that drive the four-phase motor, where each is coupled to its respective energy source and respective set of windings of the motor - Google Patents

Abstract

A four-phase motor (20) has two sets of windings (36,37) that are electrically isolated from each other. Two inverters (38,40) drive the motor, where each is coupled to its respective energy source (22,24) and set of windings. A controller (34) controls the inverters to achieve the desired power flow between the energy sources and motor. Independent claims are included for (1) inverter system; (2) method of controlling a four-phase motor.

Description

CROSS-REFERENCE TO RELATED REGISTRATIONS

These The application claims the priority of the provisional US patent application Serial No. 60,952,772, filed July 30, 2007.

TECHNICAL AREA

embodiments of the subject matter described herein generally relate to vehicle drive systems, and in particular relate to embodiments of the subject hybrid vehicles with a double-sided inverter drive system.

BACKGROUND

In Recent years have seen technological advances as well always new developing styles to significant changes led in the construction of motor vehicles. One of the changes concerns the use of power and the complexity of the different ones electrical systems in motor vehicles, especially in vehicles with alternative fuel, such as hybrid, electric and Fuel cell vehicles.

Lots the electrical components that comprise the electric motors, used in such vehicles receive electrical power of AC power supplies (AC power supplies). The power sources used in such applications (e.g. As batteries), however, provide only DC power (DC power). To DC power into AC power, facilities are therefore used which are known as "inverter / rectifier", which often use multiple switches or transistors with different ones Intervals are operated to convert the DC power into AC power.

moreover use such vehicles, especially fuel cell vehicles, often two separate power sources (eg a battery and a fuel cell), with power to the electric motors that drive the wheels to supply. "Power converter", such as DC / DC converters (DC / DC converters) typically become used to transfer the power from the two voltage sources. Modern DC / DC converters often include transistors passing through a inductance are electrically connected. By controlling the states of the different transistors can be a desired one Average current can be impressed by the inductance and thus the power flow control between the two voltage sources.

The Using both an inverter / rectifier, the following is referred to as an inverter, as well as a power converter elevated the complexity the electrical system of the motor vehicle considerably. The for both types needed by facilities additional components increase also the total cost and weight of the vehicle. Accordingly Systems and methods have been developed to use a motor with is coupled to multiple power sources, without a DC / DC converter operate, whereby the efficiency of the engine by a Use of dual electrical inverter systems is maximized.

systems The prior art are limited to concepts for three-phase motors, the traditionally used in motor vehicles. The conception Many of these systems require that the two sources of energy are in the system Essentially the same voltage level. It may also be that in a situation where one of the sources for any reason Reason fails (i.e., extremely cold temperatures), prior art designs operating an engine using only the other source not allow.

Accordingly it is desirable to provide a dual inverter system to use of energy sources with different operating characteristics, a cold start of a vehicle in the event of failure of one of To enable energy sources. Other desirable ones Features and characteristics of the present invention will become apparent the following detailed description and the appended claims in Connection with the accompanying drawings and the foregoing technical area and background will be apparent.

SUMMARY

It will be a device for a motor vehicle drive system is provided. The motor vehicle drive system includes a four-phase motor with a first set of windings and a second set of windings, wherein the first set of Windings and the second set of windings electrically isolated are. A first inverter is with the first set of windings coupled. A second inverter is with the second set of windings coupled.

There is provided an apparatus for an inverter system for use in a vehicle having a first power source and a second power source. The inverter system includes a motor with a first set of wicks lungs and a second set of windings. The first set of windings is electrically isolated from the second set of windings. The inverter system further includes a first inverter coupled to the first power source and configured to drive the motor, the first set of windings coupled to the first inverter. The inverter system also includes a second inverter coupled to the second power source and configured to drive the motor, the second set of windings coupled to the second inverter. A controller is coupled to the first inverter and the second inverter. The controller is configured to control the first inverter and the second inverter to achieve a target power flow between the first power source, the second power source, and the motor.

It a method is provided to accommodate a four-phase motor Using a double-sided inverter system with a first Energy source and a second energy source is coupled to Taxes. The method includes determining an operating condition and the double-sided inverter system is modulated to Power to the four-phase motor using both energy sources in response to a first operating condition. The procedure further comprises modulating the double ended inverter system is going to be an electromagnetic charging one of the energy sources to provide in response to a second operating condition and that the double-sided inverter system is modulated, to generate an effective neutral point of the motor and power to the four-phase motor by one of the energy sources in response to provide for a third operating condition.

These Abstract is provided to a selection of concepts that will be further described in the following detailed description, in a simplified form. This summary is not meant to be key features or to identify essential features of the claimed subject matter; nor is it intended as an aid in determining the scope of protection of the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

One better understanding The subject matter may be understood by reference to the detailed description and the claims be achieved in conjunction with the following figures, in which in the various figures, like reference numerals are similar Designate elements.

1 FIG. 10 is a schematic view of an exemplary motor vehicle according to an embodiment; FIG.

2 FIG. 10 is a schematic view of a double ended inverter system according to an embodiment; FIG.

3 FIG. 13 is a schematic view of a stator winding structure for a motor for use in the double-side inverter system of FIG 2 according to an embodiment;

4 FIG. 10 is a graph of motor phase currents according to an embodiment; FIG.

5 FIG. 12 is a schematic view of a control system for operating the double-ended inverter system of FIG 2 according to one embodiment.

PRECISE DESCRIPTION

The The following detailed description is merely illustrative and is not intended to be the embodiments of the subject matter or to limit the application and uses of such embodiments. at As used herein, the word "exemplary" means "as" Example, serving an instance or illustration. "Each herein as Exemplary implementation is not necessarily as preferred or advantageous over other implementations to watch. About that There is no intention to be affected by any explicit or implied theory to be bound in the above technical Domain, the background, the abstract or the following detailed description is shown.

The following description refers to elements or nodes or features that are "connected" or "coupled" together. As used herein, unless expressly stated otherwise, "connected" means that one element / node / feature is directly connected to (or directly communicates with) another element / node / feature, and not necessarily mechanically. Similarly, unless expressly stated otherwise, "coupled" means that one element / node / feature is directly or indirectly connected to (or directly or indirectly communicates with) another element / node / feature, and not necessarily mechanically. Thus, while the schematic diagrams herein represent exemplary arrangements of elements, additional intervening elements, devices, features, or components may be present in an embodiment of the illustrated subject matter. From "first", "second" or other such numerical expressions denoting structures do not imply a sequence or order unless clearly indicated by the context.

1 illustrates a vehicle or motor vehicle 10 according to an embodiment of the present invention. The car 10 includes a chassis 12 , a body 14 , four wheels 16 , and an electronic control system 18 , The body 14 is on the chassis 12 arranged and enveloped substantially the other components of the motor vehicle 10 , The body 14 and the chassis 12 can together form a framework. The wheels 16 are each near a respective corner of the body 14 with the chassis 12 rotatably coupled.

The car 10 can be any of a number of different types of motor vehicles, such as a sedan, station wagon, truck, or sport utility vehicle (SUV), and can be a two-wheel drive (2WD) (ie, rear wheel drive or front wheel drive) Four-wheel drive (4WD) or four-wheel drive (AWD). The car 10 may also include any one or combination of a number of different types of engines, such as a gasoline or diesel fueled engine, a Flex Fuel Vehicle (FFV) engine (ie, a mixture of Gasoline and alcohol), a machine supplied with a gaseous mixture (eg, hydrogen and natural gas), a hybrid engine / electric motor, and an electric motor.

At the in 1 Illustrated exemplary embodiment includes the motor vehicle 10 also an engine 20 (ie, an electric motor / generator, drive motor, etc.), a first power source 22 , a second energy source 24 , an inverter arrangement 26 and a radiator 28 , The radiator 28 is connected to the frame at an outer portion thereof and, although not illustrated in detail, includes a plurality of cooling passages containing a cooling fluid (ie, a coolant) such as water and / or ethylene glycol (ie, "antifreeze"), and is incorporated with US Pat the inverter arrangement 26 and the engine 20 coupled. In one embodiment, the inverter assembly receives 26 a coolant and shares this with the electric motor 20 , As in 1 shown is the engine 20 also include a gear integrated therein, so that the engine 20 and the transmission through one or more drive shafts 30 with at least some of the wheels 16 mechanically coupled.

As shown, stand the first source of energy 22 and the second energy source 24 be in effective communication with and / or communicate with the electronic control system 18 and the inverter assembly 26 electrically coupled. Although not illustrated, the first energy source can be 22 and the second energy source 24 vary depending on the embodiment and may be of the same type or of different types. In one or more embodiments, the first energy source may be 22 and the second energy source 24 each comprise a battery, a fuel cell, an ultracapacitor or another suitable voltage source. A battery may be any type of battery that is suitable for use in a desired application, such as a lead-acid battery, a lithium-ion battery, a nickel-metal battery, or other rechargeable battery. An ultracapacitor may comprise a supercapacitor, an electrochemical double layer capacitor, or any other high energy density electrochemical capacitor suitable for a desired application.

Now referring to 1 and 2 can be a double-sided inverter system 32 be designed so that it has a motor 20 drives, which has more than three phases according to one embodiment. The double-sided inverter system 32 includes the engine 20 , the first energy source 22 , the second energy source 24 , the inverter arrangement 26 and a controller 34 ,

The motor 20 is a multiphase AC motor (AC motor) and includes a first set of windings 36 (or coils) and a second set of windings 37 where each winding is one phase of the motor 20 equivalent. Although not illustrated, the engine includes 20 a stator assembly (which includes the coils), a rotor assembly (which includes a ferromagnetic core), and a cooling fluid (ie, a coolant), as one skilled in the art will appreciate. The motor 20 may be an induction motor, a permanent magnet motor, or any type suitable for the desired application.

In an exemplary embodiment, the engine is 20 a four-phase motor, with the first set of windings 36 and the second set of windings 37 respectively electrically insulated biphasic wiring structures correspond. It is noted that the sets of windings 36 and 37 are electrically isolated, which means that electricity in each set of windings 36 and 37 can be independently controlled and from the current in the other set of windings 36 and 37 may differ. The sets of windings 36 and 37 can continue to apply energy to the other set of windings 36 and 37 using a magnetomotive force coming from the motor 20 he is transmitted electromagnetically. The controller 34 Can the way on which power from each energy source 22 . 24 flows independently, to achieve a target power flow.

The use of an engine 20 , the two electrically isolated sets of windings 36 and 37 includes, from two sources of energy 22 . 24 are driven, is desirable, especially in a motor vehicle 10 operating in a hybrid / electrical mode because it provides improved reliability. If, for example, a first source of energy 22 like a battery in a motor vehicle 10 for some reason fails (ie cold or harsh weather), the engine can 20 nevertheless from the second energy source 24 independently started and driven, as discussed in more detail below.

Now referring to 2 and 3 In one exemplary embodiment, the first set of windings 36 a first phase (a) and a second phase (b). In an exemplary embodiment, the spatial offset between the first phase (a) and the second phase (b) is such that the electrical angle between the first phase and the second phase is 90 ° as shown. In an exemplary embodiment, the two phases are connected to a first neutral point 39 in the engine 20 to accomplish. In an exemplary embodiment, the spatial offset between the first phase (a) and the second phase (b) is adjusted to maintain an electrical angle of 90 ° in the stator frame. It is known in the art to maintain an electrical 90 ° angle to produce a uniform torque in the motor 20 in response to a balanced two-phase current excitation leads.

Now up 4 Referring to this, providing currents to the first phase (i _a ) and the second phase (i _b ), which are 90 ° out of phase in the time domain, results in a uniformly rotating magnetic field. This is shown by the current flowing to the first neutral point 39 flows (i _{ab_n} ), which is a sum of the two phase _currents (i _a and i _b ).

Regarding 2 and 3 includes the second set of windings 37 a third phase (c) and a fourth phase (d). For the same reasons as disclosed above, in an exemplary embodiment, the spatial offset between the third phase (c) and the fourth phase (d) is such that the electrical angle between the third phase and the fourth phase is 90 °. In addition, the spatial offset between the two sets of windings 36 and 37 vary depending on the design, as in 3 is shown by the symbol θ. In an exemplary embodiment, the spatial offset θ is also 90 °, as in FIG 2 is shown. Even though 3 the windings 36 and 37 With a lumped winding structure, the concepts and principles discussed herein may be extended to a distributed winding structure.

In addition, professionals will find that a multi-phase motor 20 additional advantages over a conventional machine with fewer phases (ie three-phase) as a function of the spatial offset of the two sets of windings 36 and 37 can provide in the stator. For example, varying the spatial offset between the two sets of windings 36 and 37 Reduce or eliminate air gap flux harmonics and corresponding torque harmonics and rotor copper losses generated by these airflow harmonics. The spatial offset of the windings 36 and 37 and the phase connections can be varied to suit a desired application. In an exemplary embodiment, the fundamental frequencies of the two inverters 38 and 40 which results in a more sinusoidal field distribution and a more sinusoidal current.

Back on 2 Referring to the inverter arrangement 26 a first inverter 38 and a second inverter 40 each comprising six switches (eg, semiconductor devices, such as transistors and / or switches) with anti-parallel diodes (ie, antiparallel to each switch). As shown, the switches are in the inverters 38 and 40 arranged in three pairs (or thighs), being pairs 42 . 44 and 46 in the first inverter 38 are and couples 48 . 50 and 52 in the second inverter 40 are located.

In an exemplary embodiment, the first phase is (a) of the first set of windings 36 of the motor 20 at opposite ends thereof between the switches of the switch pair 42 in the first inverter 38 and the second phase (b) to the first neutral point 39 electrically switched. The second phase (b) of the first set of windings 36 is between the switches of the pair 44 in the first inverter 38 and the first neutral point 39 switched as shown. The first neutral point 39 is between the switches of the pair 46 connected. Similarly, the two phases (c, d) of the second set of windings 37 as shown between the switches of the pairs 48 . 50 and 52 and a second neutral point 41 be switched. In addition, in an alternative embodiment, the negative bus of the two energy giequellen 22 . 24 also be connected to a common negative point (not shown) create.

In this configuration, as the energy sources 22 . 24 are electrically isolated, energy sources 22 . 24 with different voltage levels, power classifications, operating characteristics, etc. can be used simultaneously. This is particularly advantageous in comparison with other inverter systems where it is necessary for practical reasons that the energy sources 22 . 24 are almost identical. For example, in this case, a high voltage source (≥ 100V), such as a fuel cell, can be used simultaneously with a 12V battery to power the engine 20 drive.

Still referring to 2 can be the double-sided inverter system 32 also first and second capacitors 54 and 56 include, each with the first and second energy source 22 . 24 are connected in parallel to smooth current ripple during operation. The controller 34 is in effective communication with and / or is with the first and second inverters 38 and 40 electrically connected. The controller 34 responds to commands issued by the driver of the motor vehicle 10 received (ie via an accelerator pedal) and provides commands to the first inverter 38 and the second inverter 40 to, as described, the output of the inverter 38 and 40 to control.

Again with respect to 1 stands the electronic control system 18 in effective communication with the engine 20 , the first energy source 22 , the second energy source 24 and the inverter assembly 26 , Although not shown in detail, the electronic control system can 18 various sensors and vehicle control modules or electronic control units (ECUs), such as an inverter control module (ie, the in 2 shown controller 34 ) and a vehicle controller, and at least one processor and / or memory that includes instructions stored therein (or in another computer-readable medium) to perform the processes and methods as described below.

In operation, the motor vehicle 10 operated by adding power to the wheels 16 with the electric motor 20 which power is supplied from the first energy source 22 and the second energy source 24 alternately and / or from the first energy source 22 and the second energy source 24 receives at the same time. To the engine 20 to provide power, DC power is from the first source of energy 22 and the second energy source 24 to the first and second inverters 38 respectively. 40 which convert the DC power to AC power, as is well understood in the art. The first and second inverter 38 and 40 generate AC voltages on the windings 36 and 37 (or phases). As is generally understood, the hang on the windings 36 and 37 of the motor 20 required voltages from the speed, the commanded torque (ie commanded synchronous frame currents) and other motor parameters.

5 illustrates a control system 60 to operate an engine 20 in a double-sided inverter system 32 using the principles described above according to one embodiment. High Frequency Pulse Width Modulation (PWM) may be provided by the controller 34 be applied to the inverter 38 and 40 to modulate and control and to manage the voltage supplied by the inverters 38 and 40 is produced. The control system 60 includes first and second PWM blocks 68 and 70 and the double-sided inverter system 32 ,

The controller 34 provides a control algorithm that provides a desired power flow between the first and second energy sources 22 . 24 achieved while the commanded torque in the engine 20 is produced. Although not shown, the control system receives 60 a torque command for the engine 20 from which the controller 34 Power commands for the first power source 22 (and / or the first inverter 38 ) and the second energy source 24 (and / or the second inverter 40 ) as well as synchronous frame currents for the windings 36 and 37 in the engine 20 can determine.

If the engine 20 the maximum power output of an energy source 22 or 24 Not needed, the extra power from the energy source 22 or 24 used to be the other energy source 22 or 24 charge. For purposes of illustration and brevity, it will be discussed that the first energy source 22 excess power generated to the second energy source 24 However, those skilled in the art will recognize that many alternative target power flows are possible and do not limit this distinction, but are for guidance only.

Now referring to 5 can the controller 34 the first and second PWM blocks 68 and 70 with modulation voltage signals v ₁ * and v ₂ * supply. The PWM blocks 68 and 70 may PWM signals for operating the switches in the first and second inverters 38 and 40 generate to cause the desired output voltages to the windings 36 and 37 be applied to the engine 20 to operate with the required torque. According to one embodiment, the controller 34 be configured to determine the operating mode. In an operating mode, the first source of energy 22 that of the engine 20 Provide required power independently. In another mode of operation, the maximum power output of the first power source 22 less than the power coming from the engine 20 is needed. If the engine 20 Power from the first source of energy 22 as well as power from the second energy source 24 needed, the controller can 34 be configured to receive a power flow from the second energy source 24 to the engine 20 in combination with the first energy source 22 to control by the double-sided inverter system 32 is modulated.

In another mode of operation, the first energy source 22 have the ability to deliver an excess amount of power (ie, a reserve power) in addition to the power supplied by the engine 20 is required to produce a commanded torque. The excess power can be supplied to the second voltage source 24 can be delivered and stored by this, and because of the in 2 shown current flow directions as a negative DC current in the voltage bus of the second voltage source 24 be considered. The reserve power can be understood to be the difference between that of the engine 20 required power and the maximum power output of the first power source 22 is. The controller 34 can be the double-sided inverter system 32 modulate to an electromagnetic charging of the second power source 24 using the magnetomotive force of the motor 20 to enable. In a further embodiment, the controller 34 be configured so that he in another operating mode, an electromagnetic charging of both energy sources 22 . 24 allows.

In a third mode of operation, the first energy source 22 for some reason (ie cold temperatures or inclement weather).

In an exemplary embodiment, the second energy source 24 Designed to work in harsh weather or cold temperatures. For example, a lithium-ion battery that operates at cold temperatures may be the second energy source 24 be chosen while the first source of energy 22 a conventional lead-acid battery can be. The controller 34 may be the inability of the first source of energy 22 To provide power, detect and power flow from the second energy source 24 to the engine 20 control by the double-sided inverter system 32 is modulated to be an effective neutral point of the motor 20 generated.

Many voltage combinations on the windings 36 and 37 can get the needed torque in the engine 20 generate and a target power flow to (or out of) the energy sources 22 . 24 and the engine 20 to reach. An optimal operating point determines the modulation voltage at the terminals of the inverters 38 and 40 , Those skilled in the art will recognize that conditions for determining an optimum operating point are left to the designer and, depending on the application, for which the motor 20 is used, along with the selected types of energy sources 22 . 24 will vary. Professionals will find that the control system 60 can be further modified to accommodate appropriate feedback signals and other methods known in the art to drive the inverters 38 and 40 to control which are not within the scope of this disclosure.

An advantage of the system and / or method described above is that the electrical system used is the motor 20 through two separate energy sources 22 . 24 power is significantly simplified because a conventional DC / DC power converter is not needed. Using the configuration described above opens up the possibility of using two energy sources 22 . 24 with different voltage levels and operating characteristics. Moreover, in a situation where one of the sources allows 22 . 24 For some reason (ie extremely cold temperatures) is not available, the double-sided inverter system 32 operating an engine 20 or the cold start of a motor vehicle 10 using only one energy source 22 . 24 , The performance of the engine 20 however, as described above, is not affected since the commanded torque is still in the engine 20 can be generated while allowing excess power between the energy sources 22 . 24 flows.

Other embodiments may use the system and method described above for various types of automobiles, various vehicles (eg, watercraft and airplanes), or altogether in various electrical systems, as it can be implemented in any situation in which dynamically change the voltages of the two sources over a wide range. The motor 20 and the inverters 38 and 40 may have different numbers of phases and the systems described herein should not be construed as being limited to a four-phase design. Other forms of energy sources 22 . 24 , such as current sources, and loads may be used which include diode rectifiers, thyristor converters, fuel cells, inductors, capacitors, and / or any combination thereof.

Of the For brevity can it be that conventional Techniques related to signal processing, data transmission, Signaling, network control and other functional aspects the systems (and the individual operating components of the systems) not described in detail herein. In addition, those in the various connecting lines shown herein to illustrate exemplary functional relationships and / or physical couplings between the different elements. It is noted that in one embodiment of the subject many alternative or additional functional relationships or physical connections exist could be.

Even though at least one exemplary embodiment in the preceding detailed description, it should be noted that a size Number of variations exists. It is also noted that the exemplary embodiment or the embodiments, described herein are not intended to limit the scope of protection, the applicability or design of the claimed subject matter in any way restrict. Instead, we have the preceding detailed description of a professionals useful guide to implementing the described embodiment or embodiments provide. It should be understood that in the function and Arrangement of elements various changes can be made can, without departing from the scope defined by the claims is what known and predictable equivalents at the time of submission this patent application.

Claims (20)

A motor vehicle drive system comprising: one four-phase motor with a first set of windings and a second set of windings, being the first set of windings and the second set of windings are electrically isolated; one first inverter coupled with the first set of windings is; and a second inverter with the second set coupled by windings. A motor vehicle drive system according to claim 1, wherein the first set of windings is connected to a first neutral point to create, and the second set of windings is connected to to create a second neutral point. A motor vehicle drive system according to claim 2, wherein the first set of windings has a first two-phase winding structure and the second set of windings comprises a second biphasic winding structure includes. A motor vehicle drive system according to claim 3, wherein the first set of windings a first phase and a second phase comprising, wherein the first phase and the second phase, a first spatial Each having a different leg of the first Inverter is coupled. A motor vehicle drive system according to claim 4, wherein the first spatial Offset between the first phase and the second phase an electrical Angle of 90 ° between generated the third phase and the fourth phase. A motor vehicle drive system according to claim 5, wherein the second set of windings a third phase and a fourth Phase, with the third phase and the fourth phase one second spatial Have offset, each with a different leg of the second Inverter is coupled. A motor vehicle drive system according to claim 6, wherein the second spatial Offset between the third phase and the fourth phase of an electric Angle of 90 ° between generated the third phase and the fourth phase. A motor vehicle drive system according to claim 7, wherein the first phase and the fourth phase a third spatial one Have offset. A motor vehicle drive system according to claim 8, wherein the third spatial Offset between the first phase and the fourth phase is 90 °. A motor vehicle drive system according to claim 1, which and a first power source coupled to the first inverter comprising, wherein the first energy source is selected from a group, that of a battery, a fuel cell and an ultracapacitor consists. A motor vehicle drive system according to claim 10, which and a second power source coupled to the second inverter comprising, wherein the second energy source is selected from a group from a battery, a fuel cell and an ultracapacitor consists. An inverter system for use in a vehicle having a first power source and a second power source, the inverter system comprising: a motor having a first set of windings and a second set of windings, the first set of windings being electrically isolated from the second set of windings ; a first inverter coupled to the first power source and configured to drive the Mo to drive the gate, wherein the first set of windings is coupled to the first inverter; a second inverter coupled to the second power source and configured to drive the motor, the second set of windings coupled to the second inverter; and a controller coupled to the first inverter and the second inverter, the controller configured to control the first inverter and the second inverter to achieve a target power flow between the first power source, the second power source, and the motor. The inverter system of claim 12, wherein the Controller is designed to deliver a power flow from the first one Power source to drive the motor to control. The inverter system of claim 13, wherein the Controller is designed to charge an electromagnetic to control the second power source by the motor. The inverter system of claim 12, wherein the Controller is designed to be an effective neutral point of the To generate motors and a power flow from the second energy source to drive the motor. The inverter system of claim 15, wherein the second energy source is a lithium-ion battery. Method for controlling a four-phase motor using a double ended inverter system, the is coupled to a first energy source and a second energy source, the method comprising: determines an operating mode becomes; the double-sided inverter system is modulated, around the four-phase motor using both energy sources to power in response to a first mode of operation; the double-sided inverter system is modulated to an electromagnetic Charging one of the energy sources in response to a second To provide operating mode; and the double-sided inverter system is modulated to an effective neutral point of the four-phase Motors generate and power from one of the energy sources in Response to a third mode of operation to the four-phase motor to deliver. The method of claim 17, wherein the first mode of operation occurs when the four-phase motor needs extra power. The method of claim 17, wherein the second mode of operation occurs when the first power source has excess power to the four-phase motor can provide. The method of claim 17, wherein the third mode of operation occurs when the first power source is not available.