Multi-winding starter-generator system

Abstract

The multiple winding starting generator system solves the problem that the starting performance and the power generation performance of the existing starting generator system cannot reach the optimal state simultaneously and belongs to the field of electric machines.The multiple winding starting generator system comprises a permanent magnet synchronous starting generator, a multiphase power converter, a multiphase rectifier and a controller; the stator winding of the permanent magnet synchronous starting generator comprises one set of n-phase starting / magnetic field control winding and i sets of m-phase power generation winding, and the rotor adopts an embedded permanent magnet structure; during starting, the controller controls the multiphase power converter to output alternating current to the starting / magnetic field control winding, so that the direct axis component I d ≥0 of the output current is greater than 0, the rotor is driven to gradually increase the rotating speed; during power generation, the engine drags the rotor to rotate, the controller obtains the power generation winding output voltage feedback according to the multiphase rectifier, the multiphase power converter is controlled in the low speed area of the engine, so that I d >0, and in the high speed area of the engine, I d <0.The multiple winding starting generator system can make the starting performance and the power generation performance reach the optimal state simultaneously.

Description

Technical Field

[0001] This invention relates to a multi-winding starting generator system, belonging to the field of electric motors. Background Technology

[0002] The starter / generator is the core of an aircraft's starting / generating system. For a starter / generator, during motoring, it must meet the starting torque and starting power requirements of the aircraft engine; during generator operation, it must meet the output power and voltage requirements across the load terminals. Simultaneously, the motor needs to be small in size, lightweight, and have good heat dissipation to meet the actual load requirements and aviation ambient temperature requirements of all-electric aircraft. Currently, based on existing research both domestically and internationally, the main types of starters / generators that can be used in aircraft starting / generating systems include: brushed DC starters / generators, three-stage brushless synchronous starters / generators, asynchronous starters / generators, switched reluctance starters / generators, and doubly salient pole starters / generators. Permanent magnet synchronous motors, with their advantages of high power density, high torque output, small size, simple structure, light weight, and high efficiency, have promising application prospects in aircraft DC power systems.

[0003] Figure 1 This is a schematic diagram of an aircraft starting / generator system employing a permanent magnet synchronous motor. Based on the reversible principle of motors, the starter and generator of a traditional aircraft engine are integrated into a single motor. When the engine needs to be started, the starter / generator enters electric mode. In this mode, the engine acts as a load, and the motor converts electrical energy into mechanical energy, driving the engine to a critical speed to achieve fuel injection and ignition, thus entering self-operating mode. After the starting phase, the starter / generator is driven by a turbine, entering generator mode, converting the mechanical energy provided by the turbine into electrical energy to power aircraft equipment.

[0004] However, existing permanent magnet synchronous starter-generator systems have the following drawbacks: Since the stator of the motor has only one set of windings, and starting and voltage regulation are achieved using a full-power bidirectional power converter, when the aircraft engine system uses low-voltage batteries for starting and then charges the high-voltage batteries after starting, the optimal winding design cannot be achieved, and the system's starting and power generation performance cannot be optimized simultaneously; at low engine speeds, the generator output power is small and cannot achieve constant output power; the power converter has a large capacity and is difficult to control; a DC-DC power converter is needed for energy transfer between the high and low voltage batteries, resulting in high system cost and large size. Summary of the Invention

[0005] To address the problem that the starting performance and power generation performance of existing starter-generator systems cannot be optimized simultaneously, this invention provides a multi-winding starter-generator system.

[0006] This invention provides a multi-winding starter generator system, including a permanent magnet synchronous starter generator, a multiphase power converter, a multiphase rectifier, and a controller;

[0007] The permanent magnet synchronous starter generator includes a stator and a rotor. The stator includes a stator core and stator windings. The stator windings include one set of n-phase starting / field control windings and i sets of m-phase generating windings, where i≥1 and n≥1. The leads of the starting / field control windings are connected to the AC output terminal of a multiphase power converter. The leads of each of the i sets of m-phase generating windings are connected to the AC input terminal of a multiphase rectifier. The rotor includes a rotor core and permanent magnets, with the permanent magnets embedded in the rotor core. The direct-axis inductance L of the one set of n-phase starting / field control windings and the i sets of m-phase generating windings is... d With cross-axis inductance L q The following conditions must be met between L: d ≥L q ;

[0008] The controller receives output voltage feedback from the i-set m-phase generator windings and controls the multiphase power converter to output AC current. Specifically, during startup, it controls the multiphase power converter to output AC current to the n-phase starting / field control windings, causing the direct-axis component I of the output current to... d ≥0, the alternating current generates a rotating magnetic field in the stator, and the rotating magnetic field interacts with the magnetic field of the rotor permanent magnet to generate electromagnetic torque, which drives the rotor to gradually increase its speed.

[0009] During power generation, the engine drives the rotor of the permanent magnet synchronous starter generator to rotate. After the permanent magnets generate an excitation electromotive force in the i sets of m-phase generating windings, based on the output voltage feedback of the i sets of m-phase generating windings obtained from the multiphase rectifier, the direct-axis component I of the AC current output by the multiphase power converter is controlled in the low-speed range of the engine. d , making I d >0, in the high-speed range of the engine, the direct-axis component I of the output alternating current. d , making I d <0.

[0010] The present invention also includes a multi-winding starter generator system, comprising a permanent magnet synchronous starter generator, a multiphase power converter, a multiphase rectifier, and a controller;

[0011] The permanent magnet synchronous starter generator includes a stator and a rotor. The stator includes a stator core and stator windings. The stator windings include one set of n-phase starting / field control windings and i sets of m-phase generating windings, where i ≥ 1. The leads of the starting / field control windings are connected to the AC output terminal of a multiphase power converter. The leads of each of the i sets of m-phase generating windings are connected to the AC input terminal of a multiphase rectifier.

[0012] The rotor consists of a rotor core and permanent magnets. The rotor core is cylindrical, and axial holes for embedding permanent magnets are formed at each cross-axis position of the rotor core. The permanent magnets are fixed within these holes, and their central symmetry lines lie on the cross-axis of the rotor. The permanent magnets are magnetized either parallelly or radially. The direction of the magnetic field lines generated by the permanent magnets is opposite to the direction of the magnetic field lines generated by the cross-axis current. The rotor includes one set of n-phase starting / field control windings and one set of m-phase generating windings with direct-axis inductance L. d With cross-axis inductance L q The following conditions must be met between L: d >L q Permanent magnet magnetic chain Ψ pm With cross-axis current I q The generated magnetic flux L q I q The following conditions must be met between them: Ψ pm ≥L q I q ;

[0013] The controller receives output voltage feedback from the i-set m-phase generator windings and controls the multiphase power converter to output AC current. Specifically, during startup, it controls the multiphase power converter to output AC current to the n-phase starting / field control windings, causing the direct-axis component I of the output current to... d When the AC current is ≥0, a rotating magnetic field is generated in the stator. This rotating magnetic field interacts with the magnetic field of the rotor permanent magnet, producing electromagnetic torque and driving the rotor to gradually increase its speed. During power generation, the engine drives the rotor of the permanent magnet synchronous starter generator to rotate. After the permanent magnet generates an excitation electromotive force in the i sets of m-phase generating windings, based on the output voltage feedback of the i sets of m-phase generating windings obtained from the multiphase rectifier, the direct-axis component I of the AC current output by the multiphase power converter is controlled in the low-speed region of the engine. d , making I d >0, in the engine's lowest power generation speed range, the direct-axis component I d At its maximum, the direct-axis component I gradually decreases as engine speed increases. d .

[0014] Preferably, the i sets of m-phase generating windings have the same structure, each set being a three-phase AC winding, i>1, and the phase difference between corresponding phases of each set of three-phase AC windings is δ, which should meet the condition in electrical angle: δ=60° / i; the multiphase rectifier is a three-phase rectifier; the lead wires of the i sets of three-phase AC windings are each connected to the AC input terminal of a three-phase rectifier, the three-phase rectifier is an uncontrolled rectifier, and the DC output terminals of the i three-phase uncontrolled rectifiers are connected in parallel or in series.

[0015] Preferably, the DC-side voltage of the multiphase rectifier is different from the DC-side voltage level of the multiphase power converter.

[0016] Preferably, the multiphase rectifier is either an uncontrolled rectifier or a controlled rectifier.

[0017] As a preferred option, when the m-phase generating winding needs to directly output AC power, the lead wires of the m-phase generating winding are not connected to the multiphase rectifier.

[0018] Preferably, the m-phase generator winding is embedded in the slot opening side of the stator core slot.

[0019] Preferably, the system further includes a rotor position sensor for detecting the rotor position and sending it to the controller.

[0020] Preferably, the controller uses a rotorless position sensor to obtain the rotor position.

[0021] As a preferred option, n and m are the same.

[0022] The beneficial effects of this invention are as follows: The multi-winding starter generator system of this invention adopts a multi-winding structure, a specially designed embedded permanent magnet rotor structure, and a special air gap magnetic field and excitation electromotive force control method, resulting in a starter generator system with the following advantages:

[0023] (1) A small-capacity power converter is used to achieve voltage regulation control of the output of the high-power generator winding. The starting and field control share a set of windings and power converters, resulting in high system integration, small size and low cost.

[0024] (2) It can achieve the optimal design of low-voltage starting and high-voltage power generation system, so that the starting performance and power generation performance can be optimized at the same time;

[0025] (3) It can achieve constant power output of the generator winding within a wide range of engine speed variations;

[0026] (4) The hybrid excitation method of the stator magnetic field control winding and the rotor permanent magnet jointly generates the air gap magnetic field has low excitation loss and high system efficiency.

[0027] (5) It can achieve simultaneous output of different voltage levels, AC and DC, and has high system flexibility;

[0028] (6) A DC-DC power converter that can directly charge high and low voltage batteries separately, eliminating energy transfer between high and low voltage batteries. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an existing aircraft permanent magnet synchronous starter generator system.

[0030] Figure 2 This is a schematic diagram of the multi-winding starting generator system of the present invention. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0034] Specific Implementation Method 1: A multi-winding starting generator system according to this implementation method, such as... Figure 1 As shown, it includes a permanent magnet synchronous starter generator, a multiphase power converter, a multiphase rectifier, and a controller;

[0035] The permanent magnet synchronous starter generator includes a stator and a rotor. The stator includes a stator core and stator windings. The stator windings include one set of n-phase starting / field control windings and i sets of m-phase generating windings, where i ≥ 1. The leads of the starting / field control windings are connected to the AC output terminal of a multiphase power converter. The leads of each of the i sets of m-phase generating windings are connected to the AC input terminal of a multiphase rectifier. The rotor includes a rotor core and permanent magnets, with the permanent magnets embedded in the rotor core. The direct-axis inductance L of the one set of n-phase starting / field control windings and the i sets of m-phase generating windings is... d With cross-axis inductance L q The following conditions must be met between L: d ≥L q ;

[0036] The controller is used to provide feedback based on the output voltage of the i-set m-phase generator windings, such as Figure 1 The controller detects the terminal voltage of the multiphase rectifier output and controls the output AC current of the multiphase power converter. Specifically, during startup, the controller directs the multiphase power converter to output AC current to the n-phase start / field control windings, causing the direct-axis component I of the output current to... d ≥0, the alternating current generates a rotating magnetic field in the stator, and the rotating magnetic field interacts with the magnetic field of the rotor permanent magnet to generate electromagnetic torque, which drives the rotor to gradually increase its speed.

[0037] During power generation, the engine drives the rotor of the permanent magnet synchronous starter generator to rotate. The magnetic field of the permanent magnet "cuts" the generator windings. After the permanent magnet generates an excitation electromotive force in the i sets of m-phase generator windings, the controller, based on the output voltage feedback of the i sets of m-phase generator windings obtained from the multiphase rectifier, controls the direct-axis component I of the AC current output by the multiphase power converter in the low-speed range of the engine. d , making I d >0, in the high-speed range of the engine, the direct-axis component I of the output alternating current. d , making I d <0.

[0038] In this embodiment, the DC-side voltage of the multiphase rectifier is different from the DC-side voltage level of the multiphase power converter. The multiphase rectifier can be an uncontrolled rectifier or a controlled rectifier. When the m-phase generating winding needs to directly output AC power, the lead wire of the m-phase generating winding is not connected to the multiphase rectifier. The m-phase generating winding is embedded in the slot opening side of the stator core slot. n and m may be the same or different. The controller needs the rotor position during the control process. When detecting the rotor position, a rotor position sensor or a rotorless position sensor can be used.

[0039] In this embodiment, the structure of each m-phase generating winding can be the same or different. When different, the number of coil turns, the number of magnetic pole pairs, and the number of stator slots of each m-phase generating winding can be set to be different.

[0040] Similarly, in the preferred embodiment, the i sets of m-phase power generation windings in this embodiment have the same structure, each set is a three-phase AC winding, i>1, the phase difference between corresponding phases of each set of three-phase AC windings is δ, which should meet the condition in electrical angle: δ=60° / i; the multiphase rectifier is a three-phase rectifier; the lead wires of the i sets of three-phase AC windings are each connected to the AC input terminal of a three-phase rectifier, the three-phase rectifier is an uncontrolled rectifier, and the DC output terminals of the i three-phase uncontrolled rectifiers are connected in parallel or in series.

[0041] The multi-winding starter-generator system of this embodiment has high power density and high efficiency, and can achieve optimal design of starting and power generation performance. It can achieve simultaneous output of different voltage levels, AC and DC, and has high system flexibility. It has good application prospects in starting / variable speed power generation systems of fixed-wing aircraft, helicopters and other similar applications.

[0042] Specific Implementation Method 2: A multi-winding starting generator system according to this implementation method includes a permanent magnet synchronous starting generator, a multiphase power converter, a multiphase rectifier, and a controller;

[0043] The permanent magnet synchronous starter generator includes a stator and a rotor. The stator includes a stator core and stator windings. The stator windings include one set of n-phase starting / field control windings and i sets of m-phase generating windings, where i ≥ 1. The leads of the starting / field control windings are connected to the AC output terminal of a multiphase power converter. The leads of each of the i sets of m-phase generating windings are connected to the AC input terminal of a multiphase rectifier.

[0044] The rotor consists of a rotor core and permanent magnets. The rotor core is cylindrical, and axial holes for embedding permanent magnets are formed at each cross-axis position of the rotor core. The permanent magnets are fixed within these holes, and their central symmetry lines lie on the cross-axis of the rotor. The permanent magnets are magnetized either parallelly or radially. The direction of the magnetic field lines generated by the permanent magnets is opposite to the direction of the magnetic field lines generated by the cross-axis current. The rotor includes one set of n-phase starting / field control windings and one set of m-phase generating windings with direct-axis inductance L. d With cross-axis inductance L q The following conditions must be met between L: d >L q Permanent magnet magnetic chain Ψ pm With cross-axis current I q The generated magnetic flux L q I q The following conditions must be met between them: Ψ pm ≥L q I q ;

[0045] The controller is used to provide feedback based on the output voltage of the i-set m-phase generator windings, such as Figure 1 The controller detects the terminal voltage of the multiphase rectifier output and controls the output AC current of the multiphase power converter. Specifically, during startup, the controller directs the multiphase power converter to output AC current to the n-phase starting / field control windings, causing the direct-axis component I of the multiphase power converter output current to... d When the current is ≥0, the alternating current generates a rotating magnetic field within the stator. This rotating magnetic field interacts with the magnetic field of the rotor permanent magnet, producing electromagnetic torque and driving the rotor to gradually increase its speed. During power generation, the engine drives the rotor of the permanent magnet synchronous starter generator to rotate. The magnetic field of the permanent magnet "cuts" the generating windings. After the permanent magnet generates an excitation electromotive force in the i sets of m-phase generating windings, the controller, based on the output voltage feedback from the multiphase rectifier of the i sets of m-phase generating windings, controls the direct-axis component I of the multiphase power converter output current in the low-speed range of the engine. d , making I d >0, in the engine's lowest power generation speed range, the direct-axis component I d At its maximum, the direct-axis component I gradually decreases as engine speed increases. d .

[0046] In this embodiment, the DC-side voltage of the multiphase rectifier is different from the DC-side voltage level of the multiphase power converter. The multiphase rectifier can be an uncontrolled rectifier or a controlled rectifier. When the m-phase generating winding needs to directly output AC power, the lead wire of the m-phase generating winding is not connected to the multiphase rectifier. The m-phase generating winding is embedded in the slot opening side of the stator core slot. n and m may be the same or different. The controller needs the rotor position during the control process. When detecting the rotor position, a rotor position sensor or a rotorless position sensor can be used.

[0047] In this embodiment, the structure of each m-phase generating winding can be the same or different. When different, the number of coil turns, the number of magnetic pole pairs, and the number of stator slots of each m-phase generating winding can be set to be different.

[0048] Similarly, in the preferred embodiment, the i sets of m-phase power generation windings in this embodiment have the same structure, each set is a three-phase AC winding, i>1, the phase difference between corresponding phases of each set of three-phase AC windings is δ, which should meet the condition in electrical angle: δ=60° / i; the multiphase rectifier is a three-phase rectifier; the lead wires of the i sets of three-phase AC windings are each connected to the AC input terminal of a three-phase rectifier, the three-phase rectifier is an uncontrolled rectifier, and the DC output terminals of the i three-phase uncontrolled rectifiers are connected in parallel or in series.

[0049] The multi-winding starter-generator system of this embodiment has high power density and high efficiency, and can achieve optimal design of starting and power generation performance. It can achieve simultaneous output of different voltage levels, AC and DC, and has high system flexibility. It has good application prospects in starting / variable speed power generation systems of fixed-wing aircraft, helicopters and other similar applications.

[0050] Specific Implementation: The multi-winding starter generator system of this embodiment includes a dual-winding three-phase permanent magnet synchronous motor, a three-phase power converter, and a three-phase rectifier. The dual-winding three-phase permanent magnet synchronous motor includes a stator and a rotor. The stator includes a stator core and stator windings. The stator windings include one set of three-phase starting / field control windings and one set of three-phase generating windings. The leads of the starting / field control windings are connected to the AC output terminals of the three-phase power converter; the leads of the generating windings are connected to the AC input terminals of the three-phase rectifier. The rotor includes a rotor core and permanent magnets, and the rotor has an embedded permanent magnet structure.

[0051] During power generation, based on the feedback rectifier output voltage, the controller adjusts the air gap magnetic field and the excitation electromotive force of the generator winding by controlling the magnitude and phase of the AC current output by the three-phase power converter, and finally stabilizes the rectifier output voltage to the target value.

[0052] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A multi-winding starter generator system, the system comprising a permanent magnet synchronous starter generator, a multiphase power converter, a multiphase rectifier, and a controller; The permanent magnet synchronous starter generator includes a stator and a rotor. The stator includes a stator core and stator windings. The stator windings include one set of n-phase starting / field control windings and i sets of m-phase generating windings, where i≥1 and n≥1. The leads of the starting / field control windings are connected to the AC output terminal of a multiphase power converter. The leads of each of the i sets of m-phase generating windings are connected to the AC input terminal of a multiphase rectifier. The rotor includes a rotor core and permanent magnets, with the permanent magnets embedded in the rotor core. The direct-axis inductance L of the one set of n-phase starting / field control windings and the i sets of m-phase generating windings is... d With cross-axis inductance L q The following conditions must be met between L: d ≥L q ; The controller receives output voltage feedback from the i-set m-phase generator windings and controls the multiphase power converter to output AC current. Specifically, during startup, it controls the multiphase power converter to output AC current to the n-phase start / field control windings, causing the direct-axis component I of the output current to... d ≥0, the alternating current generates a rotating magnetic field in the stator, and the rotating magnetic field interacts with the magnetic field of the rotor permanent magnet to generate electromagnetic torque, which drives the rotor to gradually increase its speed. During power generation, the engine drives the rotor of the permanent magnet synchronous starter generator to rotate. After the permanent magnets generate an excitation electromotive force in the i sets of m-phase generating windings, based on the output voltage feedback of the i sets of m-phase generating windings obtained from the multiphase rectifier, the direct-axis component I of the AC current output by the multiphase power converter is controlled in the low-speed range of the engine. d , making I d >0, in the high-speed range of the engine, the direct-axis component I of the output alternating current. d , making I d <0.

2. A multi-winding starter generator system, the system comprising a permanent magnet synchronous starter generator, a multiphase power converter, a multiphase rectifier, and a controller; The permanent magnet synchronous starter generator includes a stator and a rotor. The stator includes a stator core and stator windings. The stator windings include one set of n-phase starting / field control windings and i sets of m-phase generating windings, where i ≥ 1. The leads of the starting / field control windings are connected to the AC output terminal of a multiphase power converter. The leads of each of the i sets of m-phase generating windings are connected to the AC input terminal of a multiphase rectifier. The rotor consists of a rotor core and permanent magnets. The rotor core is cylindrical, and axial holes for embedding permanent magnets are formed at each cross-axis position of the rotor core. The permanent magnets are fixed within these holes, and their central symmetry lines lie on the cross-axis of the rotor. The permanent magnets are magnetized either parallelly or radially. The direction of the magnetic field lines generated by the permanent magnets is opposite to the direction of the magnetic field lines generated by the cross-axis current. The rotor includes one set of n-phase starting / field control windings and one set of m-phase generating windings with direct-axis inductance L. d With cross-axis inductance L q The following conditions must be met between L: d >L q Permanent magnet magnetic chain Ψ pm With cross-axis current I q The generated magnetic flux L q I q The following conditions must be met between them: Ψ pm ≥L q I q ; The controller receives output voltage feedback from the i-set m-phase generator windings and controls the multiphase power converter to output AC current. Specifically, during startup, it controls the multiphase power converter to output AC current to the n-phase start / field control windings, causing the direct-axis component I of the output current to... d When the AC current is ≥0, a rotating magnetic field is generated in the stator. This rotating magnetic field interacts with the magnetic field of the rotor permanent magnet, producing electromagnetic torque and driving the rotor to gradually increase its speed. During power generation, the engine drives the rotor of the permanent magnet synchronous starter generator to rotate. After the permanent magnet generates an excitation electromotive force in the i sets of m-phase generating windings, based on the output voltage feedback of the i sets of m-phase generating windings obtained from the multiphase rectifier, the direct-axis component I of the AC current output by the multiphase power converter is controlled in the low-speed region of the engine. d , making I d >0, in the engine's lowest power generation speed range, the direct-axis component I d At its maximum, the direct-axis component I gradually decreases as engine speed increases. d .

3. The multi-winding starting generator system according to claim 1 or 2, characterized in that, The i sets of m-phase generating windings have the same structure, each set being a three-phase AC winding, i>1, and the phase difference between corresponding phases of each set of three-phase AC windings is δ, which should meet the condition δ=60° / i when expressed in electrical angles; the multiphase rectifier is a three-phase rectifier; the lead wires of the i sets of three-phase AC windings are each connected to the AC input terminal of a three-phase rectifier, the three-phase rectifier is an uncontrolled rectifier, and the DC output terminals of the i three-phase uncontrolled rectifiers are connected in parallel or in series.

4. The multi-winding starting generator system according to claim 1 or 2, characterized in that, The DC-side voltage of a multiphase rectifier is different from that of a multiphase power converter.

5. The multi-winding starting generator system according to claim 1 or 2, characterized in that, Multiphase rectifiers can be either uncontrolled or controlled rectifiers.

6. The multi-winding starting generator system according to claim 1 or 2, characterized in that, When the m-phase generating winding needs to directly output AC power, the lead wire of the m-phase generating winding is not connected to the multiphase rectifier.

7. The multi-winding starting generator system according to claim 1 or 2, characterized in that, The m-phase generator winding is embedded on the slot opening side of the stator core slot.

8. The multi-winding starting generator system according to claim 1 or 2, characterized in that, The system also includes a rotor position sensor for detecting the rotor position and sending it to the controller.

9. The multi-winding starting generator system according to claim 1 or 2, characterized in that, The controller uses a rotorless position sensor to obtain the rotor position.

10. The multi-winding starting generator system according to claim 1 or 2, characterized in that, n and m are the same.

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