Propulsion system, and protection device of rotary electric machine

Abstract

To provide a propulsion system capable of mechanically separating a rotary electric machine having a sign of failure at an arbitrary timing while continuing operation of a prime mover when abnormality of the rotary electric machine is detected and a protection device of a rotary electric machine.SOLUTION: A propulsion system includes a prime mover, a rotary electric machine, a mechanical fuse, a sensor, and a protection device. The rotary electric machine is a permanent magnet field type rotary electric machine having a rotor connected to the prime mover. The mechanical fuse is connected between the prime mover and the rotary electric machine. The sensor monitors a state of the rotary electric machine. The protection device is configured to be capable of applying a torsional vibration torque to the mechanical fuse based on an output of the sensor, the torsional vibration torque causing the mechanical fuse to rupture.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a propulsion system, and more particularly to a protection device for a rotating electrical machine directly connected to a prime mover such as an engine or a turbine. [Background technology]

[0002] In recent years, in the field of mobility applications such as ships and aircraft, there has been progress in the study of systems in which rotating electric machines are directly connected to prime movers such as engines and turbines, such as hybrid propulsion and shaft power generation, which are responsible for power assist and power generation. In such systems, if a layer short circuit or bearing abnormality occurs and rotational force continues to be applied from the prime mover, a fire caused by localized high heat or damage to the prime mover due to abnormal vibration may occur in the rotating electric machine, especially since permanent magnet type rotating electric machines cannot drop the field voltage. Since crew members on ships and aircraft cannot immediately evacuate from the location of a fire, it is desirable to build a system that can take evacuation action by disconnecting the rotating electric machine when signs of an accident are recognized and continuing operation of the prime mover.

[0003] In general, it is necessary to provide a mechanism for mechanically disconnecting the engine shaft and the generator shaft when a malfunction occurs, and examples of such mechanisms include a shear pin and a clutch mechanism. For example, Patent Document 1 describes a generator using a gas turbine as a prime mover, in which a shear pin is provided between the reducer and the generator to protect the prime mover from overload. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-37057 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in cases of interlayer short circuits or bearing abnormalities, the transient torque at the time of the abnormality is small, so the shear pin does not operate. On the other hand, the larger the capacity of the clutch mechanism, the larger and more expensive it becomes, which is an obstacle to applying the system to the mobility applications mentioned above. There is a need for a new method that can disconnect a failed rotating electric machine from the prime mover at any time before the accident spreads, while continuing to operate the prime mover, with a system structure that suppresses increases in weight and cost compared to conventional methods.

[0006] In view of the above circumstances, an object of the present invention is to provide a propulsion system and a protection device for a rotating electric machine that can mechanically isolate a rotating electric machine showing signs of failure at any time while continuing to operate the prime mover when an abnormality in the rotating electric machine is detected. [Means for solving the problem]

[0007] A propulsion system according to one aspect of the present invention includes a prime mover, a rotating electric machine, a mechanical fuse, a sensor, and a protection device. The rotating electric machine is a permanent magnet field type rotating electric machine having a rotor connected to the prime mover. The mechanical fuse is connected between the prime mover and the rotating electric machine. The sensor monitors a state of the rotating electric machine. The protection device is configured to be able to apply a torsional vibration torque to the mechanical fuse, causing the mechanical fuse to break, based on an output of the sensor.

[0008] According to the above-mentioned propulsion system, when an abnormality in the rotating electric machine is detected, a torsional vibration torque that breaks the mechanical fuse is applied to the mechanical fuse, so that a rotating electric machine showing signs of failure can be mechanically separated at any time while continuing to operate the prime mover.

[0009] The protection device may include a power converter, a protected load, and a controller. The power converter is connected to the rotating electric machine. The protected load consumes power generated by the power converter. The control unit determines whether or not there is an abnormality in the rotating electric machine based on the output of the sensor, and when it determines that there is an abnormality in the rotating electric machine, inputs a control command to the power converter to generate the torsional vibration torque.

[0010] The control command may include a torque command value in which a target torque value changes periodically.

[0011] The control unit may generate a torque command value that generates a torsional vibration torque having a frequency equivalent to a torsional resonance frequency of the mechanical fuse.

[0012] The protection device may further have a first circuit breaker capable of interrupting conduction between the power converter and an electric power load that operates by receiving power generated by the power converter, and the control unit may cause the first circuit breaker to interrupt conduction between the power converter and the electric power load when it determines that the rotating electric machine is abnormal.

[0013] The protection device may further have a second circuit breaker capable of interrupting conduction between the power converter and the protected load, and when the control unit determines that the rotating electric machine is not abnormal, it may cause the second circuit breaker to interrupt conduction between the power converter and the protected load.

[0014] The rotating electric machine may be a generator or a motor.

[0015] The mechanical fuse may be tubular in shape.

[0016] The sensor may be a temperature sensor that measures the temperature of the rotating electric machine, or a current sensor that detects a current flowing through the rotating electric machine.

[0017] The prime mover may be a jet engine.

[0018] A protection device according to one embodiment of the present invention is a protection device for a rotating electric machine having a prime mover, a permanent magnet field type rotating electric machine having a rotor connected to the prime mover, and a mechanical fuse connected between the prime mover and the rotating electric machine, and is equipped with a power converter, a protected load, and a control unit. The power converter is connected to the rotating electric machine. The protected load consumes power generated by the power converter. The control unit determines whether or not there is an abnormality in the rotating electric machine based on the output of a sensor that monitors the condition of the rotating electric machine, and when it determines that there is an abnormality in the rotating electric machine, it inputs a control command to the power converter to generate a torsional vibration torque that breaks the mechanical fuse. Effect of the Invention

[0019] According to the present invention, when an abnormality in a rotating electric machine is detected, the rotating electric machine showing signs of failure can be mechanically separated at any timing while continuing to operate the prime mover. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic configuration diagram of a propulsion system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of a generator. [Diagram 3] FIG. 4 is a control block diagram of the propulsion system during steady operation control. [Figure 4] 1 is a schematic diagram showing a state in which a layer short occurs in electromagnetic coils of a generator wound in the same slot. FIG. [Diagram 5] FIG. 1 is an equivalent circuit diagram of a permanent magnet generator (PMSG). [Figure 6] FIG. 4 is a control block diagram of the propulsion system during protection control. [Figure 7] FIG. 4 is a waveform diagram showing an example of power oscillation. [Figure 8] FIG. 2 is a diagram illustrating the phase relationship between a prime mover and a generator. [Figure 9]FIG. 11 is a diagram showing the relationship between the frequency of vibration torque and the response magnification. [Figure 10] FIG. 13 is a diagram showing the relationship between the response torque acting on a mechanical fuse and the generator torque. [Figure 11] FIG. 4 is a schematic configuration diagram of a propulsion system according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] 1 is a schematic configuration diagram of a propulsion system 100 according to one embodiment of the present invention. The propulsion system 100 of this embodiment is applied to a propulsion system installed in, for example, an aircraft, and includes a prime mover 10, a generator 20, and a protection device 40.

[0023] [Propulsion system overview] Examples of aircraft equipped with the propulsion system 100 include aircraft equipped with the prime mover 10 as a propulsion device, as well as electric aircraft that drive auxiliary propulsion systems such as fans and propellers with electricity from the generator 20. In this propulsion system, the prime mover 10 rotates a propulsion propeller to obtain thrust for cruising, while the generator 20 is operated with surplus energy to generate an electric load.

[0024] The prime mover 10 is, for example, a jet engine having a compressor, a combustor, a turbine, etc. The prime mover 10 drives a thruster 12 such as a propeller or a fan via gears 11 and the like, while also driving a generator 20. The prime mover 10 is controlled by a prime mover controller 15 such as a Full Authority Digital Engine Control (FADEC). The prime mover controller 15 executes control of fuel supply to the prime mover 10, etc., so as to maintain the speed by keeping the thruster 12 at a constant rotation speed during cruising.

[0025] The generator 20 is a permanent magnet synchronous generator (PMSG) that converts the rotational force of the rotating shaft 10a of the prime mover 10 into electric energy. Fig. 2 is a schematic diagram showing the configuration of the generator 20. The generator 20 includes a rotor 21 having permanent magnets 21S, 21N, and a stator 22 around which a multi-phase electromagnetic coil is wound.

[0026] The multi-phase electromagnetic coil is not particularly limited as long as it is an electromagnetic coil through which two or more alternating currents of different phases flow, and here, a three-phase electromagnetic coil having U-phase, V-phase, and W-phase is used. Electric power generated by the generator 20 is supplied to the electric power load 50 via a CVCF (Constant Voltage Constant Frequency) or the like. As will be described later, the generator 20 may be a motor that performs power running to support the power of the prime mover 10 (see FIG. 11).

[0027] The rotating shaft 20a (rotor 21) of the generator 20 is connected to the rotating shaft 10a of the prime mover 10 via a mechanical fuse 30. The mechanical fuse 30 transmits the rotational driving force of the prime mover 10 to the generator 20. A shear pin (also called a shear pin) is used for the mechanical fuse 30. The mechanical fuse 30 is formed in a tubular shape such as a cylindrical shape, or formed in a shape that is partially narrowed by providing a constriction in part so that it can be broken by a predetermined torsional vibration torque that is electrically generated in a protection device 40 as described below.

[0028] A monitoring sensor 31 for monitoring the state of the generator 20 is attached to the generator 20. The monitoring sensor 31 may be a temperature sensor for measuring the temperature of the generator 20, a current sensor for detecting the current generated by the generator 20, or the like. In this embodiment, the monitoring sensor 31 includes three temperature sensors 31a, 31b, and 31c attached to the stator 22 at equal angular intervals, for example, as shown in FIG.

[0029] A current sensor 32 that detects the magnitude of the current flowing through the electromagnetic coil is attached between the generator 20 and the protection device 40 (power converter 41). This current sensor 32 is a sensor for feeding back the generator current to the control unit 43 so that the current generated in the generator 20 reaches a target current value. Note that the current sensor 32 may be used as the monitoring sensor 31 instead of or in addition to the temperature sensors 31a to 31c.

[0030] The protection device 40 functions as a power generation control device that controls the power generated in the generator 20 during normal operation when there is no abnormality in the generator 20, and has a function of protecting the generator 20 by disconnecting the generator 20 from the prime mover 10 when an abnormality is detected in the generator 20. More specifically, the protection device 40 monitors whether or not there is an abnormality in the generator 20, supplies the power generated by the generator 20 to the power load when the generator 20 is normal, and generates a power oscillation to break the mechanical fuse 30 and disconnect the generator 20 from the prime mover 10 when an abnormality in the generator 20 is detected. The protection device 40 will be described in detail below.

[0031] [Protective device] The protection device 40 includes a power converter 41 , a protected load 42 , a control unit 43 , a first circuit breaker 51 , and a second circuit breaker 52 .

[0032] The power converter 41 is connected to the generator 20 and is a converter that converts AC power generated by the generator 20 into a predetermined DC power consumed by the power load 50. The power load 50 is a power circuit or power equipment that operates by receiving the power generated by the power converter 41. Examples of the power load include electric equipment such as fans and pumps installed on the aircraft, as well as air conditioning equipment, batteries, and an auxiliary propulsion system.

[0033] The first circuit breaker 51 is a switch capable of cutting off the electrical continuity between the power converter 41 and the power load 50. The first circuit breaker 51 is controlled to be opened and closed by the control unit 43, and cuts off the electrical continuity between the power converter 41 and the power load 50 when an abnormality is detected in the generator 20 as described below.

[0034] The protective load 42 is an element capable of consuming the power generated by the power converter 41 to generate a power oscillation for breaking the mechanical fuse 30 and disconnecting the generator 20 from the prime mover 10, and is composed of a resistive element in this embodiment. The resistive element constituting the protective load 42 may be a single resistive element or a group of resistive elements connected in series or parallel.

[0035] The second circuit breaker 52 is a switch capable of cutting off the electrical continuity between the power converter 41 and the protected load 42. The second circuit breaker 52 is controlled to open and close by the control unit 43, and cuts off the electrical continuity between the power converter 41 and the protected load 42 when it is determined that the generator 20 is not abnormal, as will be described later.

[0036] 1, the control unit 43 has a signal generating circuit 431. The signal generating circuit 431 generates a control signal for controlling the power generated by the power converter 41.

[0037] (Steady-state operation control) 3 is a control block diagram showing a configuration example of the propulsion system 100, illustrating details of the signal generating circuit 431 during steady operation control when no abnormality occurs in the generator 20. As shown in FIG. 3, the signal generating circuit 431 has a current command value generator 44, a current controller 45, and a power controller 46.

[0038] The current command value generator 44 determines the q-axis current command value i based on the torque target value τ* of the generator 20 and the power control signal output from the power controller 46. d * and q-axis current command value i q Generate *.

[0039] The torque target value τ* changes from moment to moment depending on the state of the power load 50, such as a fan or pump mounted on the aircraft. Since the generator 20 side cannot control the speed, a new torque target value is calculated from the power measured on the load side and the generator speed to balance the power consumed by the power load 50 and the power generated by the generator 20 and to suppress voltage fluctuations to the equipment, and is reset by the power controller 46. If necessary, the accuracy of the current command value may be improved by feeding back d-axis current, q-axis current, DC voltage, and speed information.

[0040] The current controller 45 determines the q-axis current command value i d * and q-axis current command value i q *Based on the voltage control amount V uvw The power converter 41 generates a voltage control amount V* and supplies it to the power converter 41 as a control command. uvw The generator 20 is controlled based on the signal * to supply the generated DC voltage Vdc to the power load 42.

[0041] The power controller 46 generates a power control signal to be fed back to the current command value generator 44 based on the output of the speed detector 33 that detects the rotation speed of the prime mover 10 and the power measurement value of the power load 50. The rotation speed of the prime mover 10 is determined by the engine speed command ω c * and the actual engine speed value ω detected by the speed detector 33 c The engine controller 15 controls the engine 10 based on the above.

[0042] (Protection and Control) The control unit 43 further has a determination unit 432 that determines an abnormality in the generator 20 based on the output of the monitoring sensor 31. When the determination unit 432 determines that the generator 20 is abnormal, the control unit 43 executes protective control to apply to the mechanical fuse 30 a torsional vibration torque that breaks the mechanical fuse 30 by inputting a torque command value, the target torque value of which changes periodically, to the power converter 41 as a control command for generating a torsional vibration torque.

[0043] As an example, FIG. 4 shows a state in which a layer short occurs in the electromagnetic coils C of the generator 20 wound in the same slot (the same teeth). The stator 22 has a plurality of slots partitioned by a plurality of teeth, and in this case, the state in which a short circuit is formed as shown by the thick solid line in the figure by electromagnetic coils of the same phase (for example, U phase) stored in one slot shorting between different layers of turns. The magnetic flux by the field coil corresponds to the magnetic flux generated in the teeth. If a rotor in which a field magnetic flux is always generated such as a permanent magnet field type continues to rotate in this state, a short-circuit current will continue to flow in the short-circuited section in an attempt to cancel the magnetic flux generated by the rotor magnetic pole. At this time, localized heat is generated, and if this state is left unattended, there is a high risk of a fire or the like occurring.

[0044] On the other hand, when applied to ships and aircraft, it is necessary to move to a safe place such as a port or airport using the minimum amount of power. To do so, it is necessary to disconnect the prime mover 10 and the generator 20 by cutting the mechanical fuse 30, stop the generator 20 to prevent a fire, and perform evacuation actions using the power of the prime mover 10.

[0045] To get a sign of a rare short, there is a method of detecting an abnormality by trend management of the non-uniformity of the temperature of the temperature measuring elements embedded in an evenly arranged manner in the stator 22 of the generator 20. For example, if a failure occurs near the temperature measuring element 31a as shown in Fig. 2, the detected temperatures T1 of the temperature measuring element 31a, T2 of the temperature measuring element 31b, and T3 of the temperature measuring element 31c are originally uniform, but it is expected that a gradient will occur in the detected temperatures, for example, T1>T2>T3, and an abnormality is detected using a threshold value obtained from experience.

[0046] Similarly, when a bearing abnormality occurs and it is desired to stop the rotating electrical machine, the abnormality can be detected by trend management of the temperatures of the direct drive side and the non-direct drive side. In this embodiment, at the timing when such an abnormality is detected, the determination unit 432 detects an abnormality in the generator 20 and issues an instruction to separate the prime mover 10 and the generator 20.

[0047] In the existing method, it was necessary to generate a transiently large torque in order to cut the mechanical fuse 30. Intentionally generating a transient excessive torque requires a large capacity inverter that constitutes the power converter 41, but this has the drawback of increasing the size of the device.

[0048] On the other hand, in this embodiment, at any timing when an abnormality is detected, first the first circuit breaker 51 is opened to separate the generator 20 from the power load 50. Thereafter, the second circuit breaker 52 is closed to switch the load from the power load 50 to the protected load 42. The control unit 43 generates a vibration torque by controlling the power consumed by the protected load 42. Since the function of the generator is not completely lost when a layer short occurs, it is possible to control the load.

[0049] In general, in a permanent magnet generator (PMSG), the rated power P and torque τ are expressed by the following equations (1) and (2), respectively.

number

number

[0050] The voltage amplitude applied by the power converter 41 is expressed as Va=Va{1-k+ksin(ω s t)}, then the power P s , torque τ s is expressed by the following equation.

number

[0051] sinω in Eq. (3) sWhen we look at the term, we see that for the rated torque, s At (ksinδ s By adjusting each parameter as desired using the power conversion device, it is possible to generate torque vibration at the desired amplitude.

[0052] (Principle of torque vibration generation) During steady-state operation (see Figure 3), ω, which depends on the rotation speed in equation (2), is constant because there is no change in the prime mover speed, which depends on the rotation speed of the propeller (thruster 12), and under this condition, the induced voltage E0 is also constant. Therefore, the power load expressed by equation (1) is the product of each phase voltage and the load angle (V a In terms of control, the generator torque τ expressed by equation (2) is adjusted by changing the d-axis current i d and q-axis current i q This is equivalent to adjusting each phase voltage and the load angle.

[0053] FIG. 5 is an equivalent circuit diagram of a permanent magnet generator (PMSG), where A shows the d-axis current circuit and B shows the q-axis current circuit. The generator torque is expressed by the magnetic flux of the permanent magnet as ψ a , the d-axis and q-axis currents that contribute to the torque are i od , i oq (Generally, the current for iron loss is small, so i od ≒d-axis current i d , i oq ≒q-axis current i q ), d-axis and q-axis inductances are L d , L q Using this, the torque τ is expressed as follows:

number

[0054] At this time, the torque command value τ pre *, the current command value i od *, i oq* Set K as a constant as follows.

Number

Number

[0055] Figure 6 is a control block diagram of the propulsion system 100 showing the details of the signal generation circuit 431 during protection control when an abnormality is detected in the generator 20. When the protection device 40 executes protection control as shown in Figure 5, the protection load 42 is connected to the power converter 41 instead of the power load 50 by switching the first circuit breaker 51 and the second circuit breaker 52.

[0056] Before the start of protection control, the torque command value was controlled according to the situation of the power load 50. However, when the protection control is executed, the torque is vibrated to resonate with the torsional frequency ω ts of the weak point (mechanical fuse 30). Therefore, an arbitrary torque can be specified on the control side. That is, although the power generated by the generator 20 is consumed by the protection load 42, since it is not necessary to be connected to the equipment that requires guarantee of power quality, it is also possible to generate an arbitrary load by eliminating the speed feedback to the torque target value.

[0057] Since the torque can be changed with time t to generate a vibration torque, for example, the following formula can be obtained.

Number

[0058] At this time, the current command values i od *, i oq * are set as follows with K as a constant.

Number

Number

[0059] In addition, since the fuel supply to the prime mover 10 is controlled to maintain the current operation, the rotation speed does not change (ω e = constant). Even if the speed changes, it does not have a large effect because the frequency of the torque fluctuation is important. As described above, unlike the case of the power load 50 (during steady operation), the protection load 42 only needs to consume a specified amount of power, so feedback of the power consumption of the protection load 42 is not necessary.

[0060] (Power Oscillation) The protection device 40 oscillates the torque as described above, thereby applying power oscillation (torsional oscillation torque) to the mechanical fuse 30. An example waveform of the power oscillation is shown in FIG.

[0061] In vibration torque resonance, since the GD2 (flywheel effect) of the generator 20 is normally small compared to the load, when torsional resonance occurs in a mode different from that of the propeller 12, the prime mover 10, and the shaft (mechanical fuse 30) in which only the phase of the generator 20 is different, as shown in FIG. 8, the resonant torque becomes maximum.

[0062] Figure 9 shows the frequency and response magnification of the vibration torque. By gradually increasing the frequency of the vibration torque, we can see that while the response magnification is nearly 1 when the frequency is low, the torque can be increased by resonance by matching the vibration frequency as closely as possible to the resonance frequency f0. Note that the torque can be amplified by several tens of times depending on the frequency adjustment.

[0063] By utilizing this phenomenon, it is preferable to match the frequency of the vibration torque when protective control is executed to the resonance frequency f0. This causes the response torque acting on the mechanical fuse 30 to be significantly amplified relative to the torque of the generator 20, as shown in Fig. 10. The magnitude of the vibration torque can be amplified up to about 10 times the rated value, so this can be utilized to repeatedly generate a large torque to cut the mechanical fuse 30 without increasing the power supply capacity. As for the resistor constituting the protective load 42, it is only necessary to have a short-term capacity to generate the vibration torque, which prevents the device from becoming larger, and is expected to be particularly effective in mobility applications.

[0064] As described above, according to this embodiment, when an abnormality in the generator 20 is detected, a torsional vibration torque is applied to the mechanical fuse 30, so that the generator 20 showing signs of failure can be mechanically isolated at any timing while the prime mover 10 continues to operate.

[0065] Furthermore, according to this embodiment, a control command for generating a torsional vibration torque, in which the torque command value whose target torque value changes periodically, is input to the power converter 41, so that a vibration torque sufficient to cut off the mechanical fuse 30 can be generated without generating a transiently large torque.

[0066] Furthermore, since the vibration torque can be generated by the power converter 41 used during steady-state operation control, there is no need to increase the capacity of the inverter that constitutes the power converter 41, thereby preventing the device from becoming larger.

[0067] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made thereto.

[0068] For example, in the above embodiment, a layer short circuit has been given as an example of the cause of an accident, but even if a ground fault occurs in a winding or between two independent windings, the above-mentioned effects can be obtained by similar control depending on the severity of the accident.

[0069] In addition, in the above embodiment, the protective load 42 is used to generate the vibration torque required to break the mechanical fuse 30, but this is not limited to this, and the vibration torque may be generated using the power load 50. In this case, the installation of the protective load 42, the first circuit breaker 51, and the second circuit breaker 52 can be omitted.

[0070] In the above embodiment, the AC power generated by the generator 20 is converted into DC power by the power converter 41 and supplied to the power load 50. However, this is not limited to this. An AC (Alternating Current) converter may be provided between the power converter 41 and the power load 50, and an AC load may be connected as the power load.

[0071] Furthermore, in the above embodiment, the rotating electric machine is a permanent magnet synchronous generator 20, but the present invention is not limited to this, and an AC motor may be used as the rotating electric machine. As an example, a parallel hybrid propulsion system 200 is shown in Fig. 11. This propulsion system 200 includes a motor 60 having a rotor connected to the prime mover 10, and a battery 61 that is a power source for driving the motor 60, and is configured so that the motor 60 connected to the battery 61 can assist a part of the shaft power of the prime mover 10.

[0072] 11, power converter 41 converts DC power of battery 61 into AC power and outputs it to motor 60 based on instructions from control unit 43. When control unit 43 detects an abnormality in motor 60, it closes second circuit breaker 52 to connect power converter 51 and protective load 42, and separates motor 60 from prime mover 10 by generating a torsional vibration torque that breaks mechanical fuse 30. This makes it possible to obtain the same effects as those of the above-mentioned embodiment. [Explanation of symbols]

[0073] 10. Prime mover 20...Generator (rotating electric machine) 30...Mechanical fuse 31...Monitoring sensor 40…Protective device 41...Power converter 42...Protection load 43...Control section 50...Power load 51…First circuit breaker 52…Second circuit breaker 60...Motor (rotating electric machine) 100,200…Propulsion system

Claims

1. The prime mover, a permanent magnet field type rotating electric machine having a rotor connected to the prime mover; a mechanical fuse connected between the prime mover and the rotating electric machine; A sensor for monitoring a state of the rotating electric machine; a protection device configured to be able to apply a torsional vibration torque to the mechanical fuse to break the mechanical fuse based on an output of the sensor; A propulsion system comprising:

2. 2. The propulsion system of claim 1, The protection device comprises: a power converter connected to the rotating electric machine; a protection load that consumes power generated by the power converter; a control unit that determines whether or not there is an abnormality in the rotating electric machine based on an output of the sensor, and inputs a control command to the power converter to generate the torsional vibration torque when it is determined that there is an abnormality in the rotating electric machine. Propulsion system.

3. 3. The propulsion system of claim 2, The control command includes a torque command value in which a target torque value changes periodically. Propulsion system.

4. 4. The propulsion system of claim 3, The control unit generates a torque command value that generates a torsional vibration torque having a frequency equivalent to a torsional resonance frequency of the mechanical fuse. Propulsion system.

5. 3. The propulsion system of claim 2, The protection device further includes a first circuit breaker capable of interrupting conduction between the power converter and an electric power load that operates by receiving electric power generated by the power converter, When the control unit determines that the rotating electric machine is abnormal, the control unit causes the first circuit breaker to cut off conduction between the power converter and the power load. Propulsion system.

6. 6. The propulsion system of claim 5, The protection device further includes a second circuit breaker capable of interrupting conduction between the power converter and the protected load, When the control unit determines that the rotating electric machine is not abnormal, the control unit causes the second circuit breaker to cut off conduction between the power converter and the protected load. Propulsion system.

7. A propulsion system according to any one of claims 1 to 6, The rotating electric machine is a generator. Propulsion system.

8. A propulsion system according to any one of claims 1 to 6, The rotating electric machine is a motor. Propulsion system.

9. A propulsion system according to any one of claims 1 to 6, The mechanical fuse is tubular in shape. Propulsion system.

10. A propulsion system according to any one of claims 1 to 6, The sensor is a temperature sensor that measures the temperature of the rotating electric machine, or a current sensor that detects a current flowing through the rotating electric machine. Propulsion system.

11. A propulsion system according to any one of claims 1 to 6, The prime mover is a jet engine. Propulsion system.

12. A protection device for a rotating electric machine including a prime mover, a permanent magnet field type rotating electric machine having a rotor connected to the prime mover, and a mechanical fuse connected between the prime mover and the rotating electric machine, a power converter connected to the rotating electric machine; a protection load that consumes power generated by the power converter; a control unit that determines whether or not an abnormality exists in the rotating electric machine based on an output of a sensor that monitors a state of the rotating electric machine, and inputs a control command to the power converter to generate a torsional vibration torque that breaks the mechanical fuse when it is determined that the rotating electric machine is abnormal; A protection device for a rotating electric machine comprising:

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