Electric machine comprising a clutch assembly

Abstract

The present invention relates to an electric machine comprising a clutch assembly. In particular, an electric machine for a gas turbine engine comprises a rotor, an electric machine drive shaft, a stator, and a clutch assembly. The rotor has a rotor core rotatable about an axis of rotation. The stator has a stator core and a set of windings. The clutch assembly has an engagement body, a set of clutch teeth, and a clutch plate. The engagement body transfers torque from the electric machine drive shaft to an external drive shaft external to the electric machine.

Description

Technical Field

[0001] This disclosure generally relates to an electric motor having a rotor and a stator, and more specifically, to a clutch assembly for the electric motor. Background Technology

[0002] Turbine engines (e.g., gas turbine engines) are typically started via an air turbine starter (ATS). The ATS is usually mounted near the turbine engine and may be coupled to a high-pressure fluid source (such as compressed air) that impacts the turbine rotor within the ATS, causing it to rotate at a relatively high rate. The ATS includes an output shaft typically driven by the turbine rotor via a reduction gearbox, which provides rotational energy to the turbine engine's rotatable elements (e.g., crankshafts or rotatable shafts) to initiate rotation. Rotation by the ATS continues until the turbine engine reaches a speed sufficient for self-sustaining operation. Summary of the Invention

[0003] Technical Solution 1. An electric motor for a gas turbine engine, the electric motor comprising: A rotor that can rotate around an axis of rotation; A motor drive shaft that is rotatably driven by the rotor; A stator having a stator core and a set of windings, the stator core extending axially between a first stator end and a second stator end relative to the axis of rotation; and Clutch assembly, comprising: The motor drive shaft is provided with a coupling body, which defines the rotational output of the motor; A set of clutch teeth located along the first stator end; and A clutch disc is coupled to the motor drive shaft and is movable between a first position and a second position, the first position defining a disengaged position of the clutch assembly and the second position defining an engaged position of the clutch assembly, at which the engagement body transmits torque from the motor drive shaft to an external drive shaft outside the motor, wherein the movement of the clutch disc is based on magnetic flux generated by the set of windings.

[0004] Technical Solution 2. The motor according to Technical Solution 1, wherein the clutch assembly further includes a biasing element configured to bias the clutch disc toward the first position.

[0005] Technical Solution 3. The motor according to Technical Solution 1, wherein the engaging body includes a set of engaging teeth configured to engage a corresponding portion of the external drive shaft.

[0006] Technical Solution 4. The motor according to Technical Solution 1, wherein the motor is included in a hybrid turbine starter (HTS).

[0007] Technical Solution 5. The motor according to Technical Solution 4, wherein the external drive shaft is a turbine shaft rotatably connected to the turbine component, and the HTS includes an output shaft connected to the turbine shaft.

[0008] Technical Solution 6. The motor according to Technical Solution 1, wherein the clutch plate is a two-piece configuration having a rotating plate and a non-rotating plate connected to the rotating plate.

[0009] Technical Solution 7. The motor according to Technical Solution 6, wherein the clutch assembly includes a bearing assembly that connects the non-rotating plate to the rotating plate.

[0010] Technical Solution 8. The motor according to Technical Solution 1, wherein the clutch plate is a single-piece configuration.

[0011] Technical Solution 9. The motor according to Technical Solution 8, wherein a gap is formed axially relative to the rotation axis between the clutch disc and the set of clutch teeth, wherein the gap is non-zero in both the first position and the second position.

[0012] Technical Solution 10. The motor according to any one of Technical Solutions 1 to 9, wherein a shaft lock is formed between the rotor and the motor drive shaft.

[0013] Technical Solution 11. The motor according to Technical Solution 10, wherein the rotor includes a guide channel, and the motor drive shaft includes a plurality of spline teeth received in the guide channel, the guide channel and the plurality of spline teeth together forming the shaft lock.

[0014] Technical Solution 12. The motor according to Technical Solution 11, wherein the plurality of spline teeth are axially movable within the guide channel.

[0015] Technical Solution 13. The motor according to any one of Technical Solutions 1 to 9, wherein: The set of windings includes a set of end windings, wherein each end winding defines an opening; and The set of clutch teeth extends through the opening of the set of end windings.

[0016] Technical Solution 14. The motor according to any one of Technical Solutions 1 to 9, wherein each of the set of clutch teeth has a base extending along a corresponding portion of the first stator end, and a leg extending axially outward from the base.

[0017] Technical Solution 15. The motor according to Technical Solution 14, wherein each clutch tooth in the set of clutch teeth includes a first leg and a second leg extending radially opposite portions of the base.

[0018] Technical Solution 16. The motor according to any one of Technical Solutions 1 to 9, wherein the clutch disc comprises a first ferrous material, and the set of clutch teeth comprises a second ferrous material.

[0019] Technical Solution 17. A clutch assembly for an electric motor, the electric motor having a rotor rotatable about a rotation axis, a motor drive shaft rotatably driven by the rotor, and a stator extending between a first stator end and a second stator end, the electric motor being used with a turbine engine, the clutch assembly comprising: The motor drive shaft is provided with a coupling body, which defines the rotational output of the motor; A set of clutch teeth located along the first stator end; and A clutch disc is coupled to the motor drive shaft and is movable between a first position and a second position, the first position defining a disengaged position of the clutch assembly and the second position defining an engaged position of the clutch assembly, at which the engagement body transmits torque from the motor drive shaft to an external drive shaft outside the motor, wherein the movement of the clutch disc is based on magnetic flux generated by the set of windings.

[0020] Technical Solution 18. The clutch assembly according to Technical Solution 17, wherein the clutch assembly further includes a biasing element configured to bias the clutch disc toward the first position.

[0021] Technical Solution 19. A clutch assembly according to any one of Technical Solutions 17 to 18, wherein the engagement body is configured to transmit torque from the motor drive shaft to an external drive shaft located outside the motor.

[0022] Technical Solution 20. The clutch assembly according to Technical Solution 19, wherein the motor is included in a hybrid turbine starter. Attached Figure Description

[0023] In the attached diagram: Figure 1This is a schematic diagram of a turbine engine with a hybrid turbine starter, based on the various aspects described in this article.

[0024] Figure 2 yes Figure 1 A schematic cross-sectional view of a hybrid turbine starter, further illustrating an electric motor with a clutch assembly in an engaged position according to the various aspects described herein.

[0025] Figure 3 yes Figure 1 A schematic cross-sectional view of the hybrid turbine starter, further showing the clutch assembly in the disengaged position according to the various aspects described herein.

[0026] Figure 4 yes Figure 2 A schematic cross-sectional view of a portion of a clutch assembly, further showing the bearing assembly and clutch discs, the clutch discs having non-rotating and rotating discs according to various aspects of the clutch assembly described herein.

[0027] Figure 5 yes Figure 2 A schematic perspective view of a portion of the motor, further showing the stator, a set of windings, and a set of clutch teeth according to the various aspects described herein.

[0028] Figure 6 yes Figure 2 A schematic perspective view of a portion of a hybrid turbine starter, further showing the engagement body of the clutch assembly and the turbine shaft according to the various aspects described herein.

[0029] Figure 7 It is along Figure 2 The schematic cross-sectional view of a portion of the motor seen through section line VII-VII further illustrates the shaft lock according to the various aspects described herein.

[0030] Figure 8 It is suitable for use as Figure 1 A schematic cross-sectional view of a section of an exemplary hybrid turbine starter, further showing a clutch disc and a set of clutch teeth with a gap formed therebetween, according to various aspects described herein. Detailed Implementation

[0031] This disclosure relates to an electric motor for a gas turbine engine. Specifically, it relates to a hybrid turbine starter (HTS) including an electric motor. The HTS includes a turbine shaft. The electric motor includes a rotor, a stator, an electric motor drive shaft, and a clutch assembly. The stator includes a set of windings forming a set of end windings. The clutch assembly includes clutch plates and a set of clutch teeth. The clutch plates are engaged with the electric motor drive shaft. The clutch plates are movable between a first position and a second position. Movement of the clutch plates between the first and second positions respectively causes movement of the clutch assembly between a disengaged position and an engaged position. In the engaged position, a corresponding portion of the clutch assembly contacts the turbine shaft and transmits torque from the electric motor drive shaft to an external drive shaft (e.g., the turbine shaft) outside the motor. In the disengaged position, the corresponding portion of the clutch assembly does not contact the turbine shaft.

[0032] The movement of the clutch disc between a first position and a second position, and thus the movement of the clutch assembly between a disengaged position and an engaged position, is based, accordingly, on the magnetic flux generated by a set of windings. Specifically, a threshold magnetic flux is reached when a threshold current flows through a set of windings (e.g., when a motor is turned on), which causes the clutch disc to move to the second position. When the threshold magnetic flux is not reached, the clutch disc moves to the first position. Making the movement of the clutch disc and the clutch assembly based on the generation of magnetic flux reduces the complexity of the clutch assembly by eliminating the need for an external actuator (e.g., a motor) to move the clutch assembly between the engaged and disengaged positions.

[0033] The envisioned approach is to integrate the clutch assembly, as described herein, with the motor in a manner that utilizes the leakage flux of the end windings, which would otherwise be unused. Due to the principle of reluctance, the leakage flux of the end windings attracts the clutch assembly toward the rotor and stator, thus causing the clutch assembly to move between an engaged and disengaged position.

[0034] Although this disclosure is described in some examples in conjunction with gas turbine engines for aircraft, it is also applicable to other non-aircraft applications or other gas turbine engine environments. Non-limiting examples of where this disclosure can be applied include other mobile applications as well as non-mobile industrial, commercial, and residential applications.

[0035] The term "exemplary" is used herein to mean "serving as an example, instance, or demonstration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Furthermore, unless expressly affirmed otherwise, all embodiments described herein should be considered exemplary.

[0036] As used in this article, terms such as “first” and “second” are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of a single component.

[0037] As used in this text, the term "upstream" refers to the direction opposite to the direction of fluid flow, and the term "downstream" refers to the direction in the same direction as the fluid flow. The terms "before" or "in front" mean in front of something, and "after" or "behind" mean behind something. For example, when used in relation to fluid flow, "before" or "in front" can mean upstream, and "after" or "behind" can mean downstream.

[0038] Additionally, as used herein, the terms "radial" or "radially" refer to a direction away from a common center. For example, in the general context of a turbine engine, radial refers to the direction of a ray extending between the engine's central longitudinal axis and its outer circumference. For example, as used herein, the terms "group" or "set" of elements can refer to any number of elements, including only one.

[0039] Unless otherwise indicated, connection references (such as attachment, coupling, fixing, fastening, linking, and joining) are to be interpreted broadly and may include intermediate parts between a series of elements, as well as relative movement between elements. Therefore, a connection reference does not necessarily imply that two elements are directly connected and fixed to each other. The schematic diagrams are for illustrative purposes only, and the dimensions, positions, order, and relative sizes reflected in the drawings are subject to change.

[0040] As used herein, a “controller” or “controller module” can include a component configured or adapted to provide instructions, control, operation, or any form of communication to an operable component to enable its operation. A controller or controller module can include any known processor, microcontroller, or logic device, including but not limited to: field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), full-authority digital engine control (FADECs), proportional controllers (P), proportional-integral controllers (PI), proportional-derivative controllers (PD), proportional-integral-derivative controllers (PID controllers), hardware-accelerated logic controllers (e.g., for encoding, decoding, transcoding, etc.), and combinations thereof. Non-limiting examples of controllers or controller modules include those configured or adapted to run, operate, or otherwise execute program code to achieve operational or functional results, including performing various methods, functions, processing tasks, calculations, comparisons, sensing or measuring values, etc., to enable or implement the technical operations or actions described herein. Operational or functional results may be based on one or more inputs, stored data values, sensed or measured values, true or false indications, etc. Although described as "program code," non-limiting examples of operable or executable instruction sets may include routines, programs, objects, components, data structures, algorithms, etc., that have the technical effect of performing a particular task or implementing a particular abstract data type. In another non-limiting example, the controller or controller module may also include processor-accessible data storage components, including memory, whether transient, volatile, or non-transient or non-volatile. Other non-limiting examples of memory may include random access memory (RAM), read-only memory (ROM), flash memory, or one or more different types of portable electronic memory (such as discs, DVDs, CD-ROMs, flash drives, universal serial bus (USB) drives, etc.), or any suitable combination of these types of memory. In one example, program code may be stored in memory in a machine-readable format accessible to the processor. Additionally, as described herein, memory may store various types of data, sensed or measured data values, input, generated or processed data, etc., accessible to the processor when providing instructions, control, or operation to achieve a function or operable result.

[0041] Additionally, as used herein, an element described as “electrically connected,” “electrically coupled,” or “in signal communication” may include an element that electrically transmits, receives, or communicates signals to or from such a connected or coupled element. Furthermore, such electrical connections or couplings may include wired or wireless connections, or combinations thereof.

[0042] As used herein, a “hybrid turbine starter (HTS)” refers to an air turbine starter (ATS) having a turbine component that can be selectively coupled to an electric motor. A housing (which may be several components joined together) encloses or surrounds at least a portion of the electric motor and turbine component of the air turbine starter. An HTS may be a hybrid pneumatic-electric starter (HPES), in which the turbine component is driven by pressurized air (pneumatic) or by electrical energy.

[0043] Figure 1 This is a schematic diagram of a gas turbine engine 14, which has an air turbine starter (ATS) shown as a hybrid turbine starter 10 (HTS). The HTS 10 is coupled to an accessory gearbox (AGB) 12, both of which are schematically shown as being mounted to the gas turbine engine 14, such as a gas turbine engine. The gas turbine engine 14 defines an engine centerline 15 extending in an axial direction.

[0044] The gas turbine engine 14 includes an intake with a fan 16 that supplies air to the high-pressure compression section 18. Although illustrated as being located at the radially outer portion of the fan housing 17, it is contemplated that the HTS 10 can be coupled to any part of the gas turbine engine 14. As a non-limiting example, the HTS 10 may be located radially inner of the fan housing 17 and / or shifted in the axial direction.

[0045] The air intake with fan 16 and the high-pressure compression section 18 are collectively referred to as the "cold section" upstream of the combustion chamber of the gas turbine engine 14. The high-pressure compression section 18 supplies high-pressure air to the combustion section 20. In the combustion section 20, the high-pressure air mixes with fuel and burns. The hot and pressurized combustion gases pass through the high-pressure turbine section 22 and the low-pressure turbine section 24 before exiting the gas turbine engine 14. As the combustion gases pass through the high-pressure turbine section 22 and the low-pressure turbine section 24, rotational energy is extracted from the airflow passing through the gas turbine engine 14. A shaft can connect the high-pressure turbine section 22 to the high-pressure compression section 18 to supply power to the compression mechanism. The low-pressure turbine section 24 can be connected via a shaft to the fan 16 at the air intake to supply power to the fan 16. In other words, the gas turbine engine 14 includes an engine core having the compression section 18, combustion section 20, and turbine sections 22 and 24 arranged in series, and the engine core has an engine drive shaft.

[0046] The AGB 12 is coupled to the gas turbine engine 14 at either the high-pressure turbine region 22 or the low-pressure turbine region 24. For example, the connection between the AGB 12 and the turbine engine can be achieved via a mechanical power output device 26. The mechanical power output device 26 includes multiple gears and components for mechanically coupling the AGB 12 to the gas turbine engine 14. Under normal operating conditions, the power output device 26 transmits power from the gas turbine engine 14 to the AGB 12 to supply power to aircraft accessories, such as, but not limited to, fuel pumps, electrical systems, and cabin environmental controllers. The HTS 10 may be mounted on the outside of the intake region containing the fan 16, or on the core near the high-pressure compression region 18.

[0047] Figure 2 yes Figure 1 A schematic cross-sectional view of the HTS 10. The HTS 10 includes a housing 30 defining an interior 31 and an exterior 33. The housing 30 includes an inlet 32 ​​and an outlet 34. A main airflow path 36 extends between the inlet 32 ​​and the outlet 34 to deliver a fluid flow through it. In a non-limiting example, the fluid is air, such as pressurized air, supplied from a pressurized air supply source, including but not limited to a ground-operated air supply vehicle, an auxiliary power unit, or cross-bleed air from an already operating engine. The HTS 10 includes a turbine component 38 journal-connected within the housing 30. A plurality of blades 39 extend from the turbine component 38 and are circumferentially spaced around the turbine component 38. The plurality of blades 39 are disposed within the main airflow path 36.

[0048] Turbine shaft 40 is coupled to turbine component 38. Turbine shaft 40 can rotatably extract mechanical power from airflow along main airflow path 36 via multiple blades 39, thereby causing turbine shaft 40 to rotate. Turbine shaft 40 can rotate about HTS rotation axis 45.

[0049] It is important to note that the HTS 10 is functionally and structurally similar to the gas turbine engine 14 ( Figure 1 The HTS 10 differs from the HTS 10 in that it has a compressed air source to rotate the turbine component 38. The rotation of the turbine component 38 and turbine shaft 40 in the HTS 10 is used to start the gas turbine engine 14. In addition to compressed air, the turbine component 38 can also be rotated by an electric motor 100 operably coupled to the turbine shaft 40 and housed within the HTS 10. The electric motor 100 will be described in further detail below. Another difference between the gas turbine engine 14 and the HTS 10 is that the gas turbine engine 14 uses a Brayton cycle (or Joule cycle) involving intake, compression, combustion, and exhaust. The operating environment, requirements, structure, and function of the HTS 10 and the gas turbine engine 14 are significantly different.

[0050] The main airflow path 36 has at least a first portion 41 and a second portion 42. The first portion 41 is defined from the inlet 32 ​​to the upstream face 43 of the turbine component 38. The second portion 42 is defined from the upstream face 43 of the turbine component 38 to the outlet 34.

[0051] Gear train 58 may be located within gearbox 56 and is driveably coupled to turbine component 38. In the illustrated example, gear train 58 includes ring gear 60. It should be understood that gear train 58 may include any suitable gear assembly, including but not limited to planetary gear assemblies, pinion assemblies, etc. A rotatable turbine shaft 40 connects gear train 58 to a plurality of blades 39 to allow mechanical power to be transmitted to gear train 58. Rotatable turbine shaft 40 is coupled to gear train 58 and is rotatably supported by a pair of turbine bearings 62. Gear train 58 is supported by a pair of carrier bearings 64.

[0052] The interior of the gearbox 66 may be configured to hold lubricants, including but not limited to grease or oil. The interior of the gearbox 66 may provide lubrication and cooling for mechanical parts housed therein, such as gear train 58, ring gear 60, turbine bearing 62, and carrier bearing 64.

[0053] An orifice 68 is provided in a gearbox 56. A rotatable turbine shaft 40 extends through the orifice 68 and engages with a carrier shaft 70. A clutch 72 is mounted to the carrier shaft 70 and supported by a pair of spaced-apart bearings 74. A drive shaft 76 extends from the gearbox 56 and is coupled to the clutch 72, and is additionally supported by a pair of spaced-apart bearings 74. The drive shaft 76 is driven by a gear train 58 and selectively coupled to an output shaft 78, such that during startup operation, the drive shaft 76 provides drive motion to the output shaft 78.

[0054] The motor 100 includes a stator 102, a rotor 104, a motor drive shaft 108, and a clutch assembly 132. The motor 100 may be located within a housing 30. In the non-limiting example shown, the motor 100 is an electric motor. However, in a non-limiting example, it is contemplated that the motor 100 may include a generator.

[0055] Rotor 104 includes rotor core 106. Rotor core 106 is rotatable about rotation axis 110. Rotation axis 110 may be aligned with HTS rotation axis 45 (e.g., parallel and coincident). Alternatively, rotation axis 110 may be offset from, not parallel to, HTS rotation axis 45, or a combination thereof. Rotor 104 extends axially relative to rotation axis 110 between a first rotor end 112 and a second rotor end 114.

[0056] A shaft lock 116 is formed between the rotor core 106 and the motor drive shaft 108. The shaft lock 116 connects the rotor core 106 to the motor drive shaft 108. The shaft lock 116 is any suitable lock or coupling between the motor drive shaft 108 and the rotor core 106. As a non-limiting example, the shaft lock 116 may include a plurality of spline teeth 118 arranged along the motor drive shaft 108.

[0057] The plurality of spline teeth 118 may include a first set of spline teeth 184 and a second set of spline teeth 186. The first set of spline teeth 184 is located axially rearward of the second set of spline teeth 186 relative to the axis of rotation 110. The first set of spline teeth 184 may be defined as a set of spline teeth axially rearward. The second set of spline teeth 186 may be defined as a set of spline teeth axially forward. (The remaining text appears to be unrelated and likely refers to further details about the spline teeth.) Figure 7 The shaft lock 116 is described in further detail.

[0058] The motor drive shaft 108 is driven by the rotor 104. The rotor 104 is rotatably connected to the motor drive shaft 108 via a shaft lock 116. The rotor 104 and the motor drive shaft 108 are configured to rotate relative to the stationary (i.e., non-rotating) stator 102. As a non-limiting example, the rotor 104 may be an inner rotor.

[0059] Rotor 104, specifically rotor core 106, includes a guide channel 182. The guide channel extends axially through at least a portion of rotor core 106. As a non-limiting example, the guide channel 182 extends continuously between a first rotor end 112 and a second rotor end 114. A plurality of spline teeth 118 are received within the guide channel 182. The guide channel 182 and the plurality of spline teeth 118 together form a shaft lock 116. Contemplate that at least a portion of the plurality of spline teeth 118 may be axially movable relative to the axis of rotation 110 within the guide channel 182. (The remaining text appears to be unrelated and likely refers to further details about the guide channel 104.) Figure 7 The movement of the motor drive shaft 108 and the movement of the multiple spline teeth 118 are described in further detail.

[0060] The stator 102 includes a stator core 120. The stator core 120 extends axially between a first stator end 122 and a second stator end 124 relative to the rotation axis 110. The first stator end 122 and the first rotor end 112 define axially forward portions of the stator core 120 and the rotor core 106, respectively. The second stator end 124 and the second rotor end 114 define axially rearward portions of the stator core 120 and the rotor core 106, respectively.

[0061] The stator 102 includes a set of slots 126, shown in dashed lines. The set of slots 126 are circumferentially spaced along the stator core 120 relative to the axis of rotation 110. Each of the slots 126 extends axially between a first stator end 122 and a second stator end 124 relative to the axis of rotation 110.

[0062] The stator 102 includes a set of windings 128, partially shown in dashed lines. The set of windings 128 extends through a set of slots 126 and extends axially outward from a first stator end 122 and a second stator end 124. The set of windings 128 includes a set of end windings 162. Each end winding of the set of end windings 162 defines a portion of the set of windings 128 extending from a first slot in the set of slots 126 to a second slot in the set of slots 126. The second slot is circumferentially spaced from the first slot relative to the axis of rotation 110.

[0063] The motor 100 includes a motor housing 158. The motor housing 158 at least partially defines at least a portion of the main airflow path 36. In a non-limiting example, the motor housing 158 can guide air from the inlet 32 ​​to the turbine component 38. That is, the motor housing 158 can create a smooth flow path around the motor 100.

[0064] Clutch assembly 132 includes a clutch disc 135, a set of clutch teeth 134, and an engagement body 152. The clutch disc 135 is defined as a body extending radially from the motor drive shaft 108 relative to the rotation axis 110. For example, the clutch disc 135 may be formed as a disc. The clutch disc 135 forms a continuous toroidal surface extending around the entire circumference of the rotation axis 110. Alternatively, at least a portion of the clutch disc 135 may be segmented around the rotation axis 110 such that the clutch disc 135 does not extend continuously around the entire circumference of the rotation axis 110.

[0065] Clutch plate 135 may include multiple discrete bodies. As a non-limiting example, clutch plate 135 may include a non-rotating plate 136 and a rotating plate 138. The non-rotating plate 136 and the rotating plate 138 each define an annular surface extending circumferentially around the axis of rotation 110. The non-rotating plate 136 and the rotating plate 138 may each be defined by a continuous annular structure extending continuously around the entire circumference of the axis of rotation 110. Alternatively, at least one of the non-rotating plate 136 or the rotating plate 138 may be segmented such that the non-rotating plate 136 or the rotating plate 138 does not extend continuously around the entire circumference. As a non-limiting example, the non-rotating plate 136 may be segmented such that the non-rotating plate 136 includes only a segment corresponding to the circumferential position of a set of clutch teeth 134. The interface or interaction between the set of clutch teeth 134 and the non-rotating plate 136 will be described in further detail below.

[0066] A set of clutch teeth 134 is disposed along the first stator end 122. Specifically, a set of clutch teeth 134 extends axially from a portion of the first stator end 122 relative to the axis of rotation 110. (The rest of the text appears to be unrelated and likely refers to further details about clutch teeth.) Figure 5 The configuration of a set of clutch teeth 134 is described in further detail.

[0067] Clutch disc 135, specifically at least non-rotating disc 136, comprises a first ferrous material. A set of clutch teeth 134 comprises a second ferrous material. The first ferrous material may be the same as the second ferrous material. Alternatively, the first ferrous material may be different from the second ferrous material. It will be appreciated that the second ferrous material is an electromagnetic material. The first and second ferrous materials may include, but are not limited to, steel, cast iron, wrought iron, stainless steel, etc. Thus, when current is supplied to a set of windings 128 (which will be described in further detail below), the second ferrous material is energized, causing the first ferrous material to be attracted to the second ferrous material.

[0068] Clutch assembly 132 includes bearing assembly 142. (The remaining text appears to be unrelated and possibly machine-generated.) Figure 4 The configuration of bearing assembly 142 is described in further detail. Bearing assembly 142 connects non-rotating plate 136 to rotating plate 138. Bearing assembly 142 transmits the axial movement of non-rotating plate 136 relative to the rotation axis 110 to rotating plate 138. Thus, the axial movement of non-rotating plate 136 relative to the rotation axis 110 causes axial movement of rotating plate 138. Bearing assembly 142 rotatably isolates non-rotating plate 136 from rotating plate 138. Therefore, circumferential rotation of rotating plate 138 about the rotation axis 110 does not cause rotation of non-rotating plate 136 about the rotation axis 110.

[0069] Clutch assembly 132 includes a biasing element 140. The biasing element 140 extends between a corresponding portion of rotor 104 and clutch plate 135. As a non-limiting example, the biasing element 140 extends between a first rotor end 112 and rotating plate 138. The biasing element 140 can be any suitable biasing element, such as, but not limited to, a coil spring (e.g., a tension spring or a compression spring), a leaf spring, a torsion spring, etc. As a non-limiting example, the biasing element 140 is a compression spring that axially biases the rotating plate 138 away from the first rotor end 112 relative to the rotation axis 110. As shown, the biasing element 140 is in an unbiased position such that, relative to the rotation axis 110, the biasing element 140 neither pushes the clutch plate 135 axially away from the rotor 104 nor pulls the clutch plate 135 axially toward the rotor 104.

[0070] The coupling 152 is defined as any suitable body or component configured to provide contact between a corresponding rotatable portion of the HTS 10 and the motor drive shaft 108, and to lock the corresponding rotatable portion of the HTS 10 and the motor drive shaft 108. Specifically, the coupling 152 is defined as part of the motor 100 configured to engage a corresponding portion of the turbine shaft 40. [The remaining text appears to be unrelated and possibly a fragment from another document.] Figure 6The interface between the turbine shaft 40 and the coupling body 152 is described in further detail. The coupling body 152 is configured to contact or otherwise engage the mating surface 170 of the HTS 10. The mating surface 170 may be formed along a corresponding portion of the turbine shaft 40, the turbine component 38, or a combination thereof.

[0071] Clutch disc 135 is coupled to motor drive shaft 108. Specifically, rotating disc 138 is coupled to motor drive shaft 108. Alternatively, clutch disc 135 may be integrally formed with motor drive shaft 108. Engagement body 152 is coupled to motor drive shaft 108. As a non-limiting example, motor drive shaft 108 and engagement body 152 each include a threaded region 188. Thus, engagement body 152 may be threaded onto motor drive shaft 108 at the threaded region 188. Alternatively, engagement body 152 may be integrally formed with motor drive shaft 108.

[0072] Although described with respect to the engagement 152, which is formed as a separate body from the motor drive shaft 108, it will be appreciated that any suitable body structure of the motor 100 can define the engagement 152. As a non-limiting example, the motor drive shaft 108 itself can form the engagement 152. As described herein, the engagement 152 is generally defined as the rotational output of the motor 100. Specifically, the engagement 152 is defined as the rotational output of torque from the motor 100. In other words, the engagement 152 is defined as a position along the motor 100 where rotational movement (e.g., torque) of the motor drive shaft 108 is transmitted to another part of the HTS 10.

[0073] The motor 100 is located axially in front of the turbine component 38. That is, the turbine component 38 is located axially behind the motor 100.

[0074] Figure 3 yes Figure 1 A schematic cross-sectional view of HTS 10. HTS 10 includes a housing 30 defining an interior 31 and an exterior 33. Housing 30 includes an inlet 32 ​​and an outlet 34, through which a main airflow path 36 extends. The main airflow path 36 includes a first portion 41 and a second portion 42. HTS 10 includes a turbine component 38, a plurality of blades 39, a turbine shaft 40, and a gearbox 56. Turbine component 38 has an upstream face 43. Turbine shaft 40 has a mating face 170 and is rotatable about an HTS rotation axis 45. Gearbox 56 has a gearbox interior 66 and includes a gear train 58 and a ring gear 60. An orifice 68 is formed in gearbox 56. HTS 10 includes a turbine bearing 62, a carrier bearing 64, and a pair of spaced-apart bearings 74. HTS 10 includes a carrier shaft 70, a clutch 72, a drive shaft 76, and an output shaft 78.

[0075] The motor 100 has a stator 102, a rotor 104, and a motor drive shaft 108. The motor drive shaft 108 is rotatable about a rotation axis 110. The rotor 104 includes a rotor core 106 extending between a first rotor end 112 and a second rotor end 114. A shaft lock 116 may include a plurality of splines 118 and a guide channel 182. The plurality of splines 118 may include a first set of splines 184 and a second set of splines 186. The stator 102 includes a stator core 120 extending between a first stator end 122 and a second stator end 124. The stator includes a set of slots 126. A set of windings 128 having a set of end windings 162 is supplied through the set of slots 126. The clutch assembly 132 includes a set of clutch teeth 134, clutch plates 135, non-rotating plates 136, rotating plates 138, a bearing assembly 142, a biasing element 140, and a coupling body 152. The motor drive shaft 108 can be connected to the coupling body 152 by using the threaded area 188.

[0076] refer to Figure 2 and Figure 3 During operation of the motor 100, electrical energy is supplied to a set of windings 128. The electrical energy within the set of windings 128 causes the windings to generate a magnetic field, which is quantified by magnetic flux. The magnetic flux generated by the set of windings 128 ultimately causes the rotor 104 to rotate. The rotation of the rotor 104 causes the motor drive shaft 108 to rotate. For example, the motor 100 may receive electrical energy from a power distribution system or an energy storage device (e.g., a battery).

[0077] As mentioned earlier, when the second iron-containing material is energized, the first iron-containing material is attracted to the second iron-containing material. Therefore, when magnetic flux is generated, the first iron-containing material of the clutch plate 135 and the non-rotating plate 136 is axially attracted to a set of clutch teeth 134.

[0078] When the magnetic flux does not reach the threshold (e.g., the magnetic flux is equal to or exceeds the threshold), the clutch plate 135, specifically the non-rotating plate 136, remains in the first position. Figure 2 In the first position, clutch disc 135 is not in contact with a set of clutch teeth 134. Once the magnetic flux reaches or exceeds a threshold, a portion of clutch disc 135 moves to the second position. Figure 3 In the second position, the clutch disc 135, specifically the non-rotating disc 136, is axially closer to a set of clutch teeth 134 relative to the axis of rotation 110 than in the first position. As a non-limiting example, in the second position, the clutch disc 135 may directly contact the set of clutch teeth 134. Alternatively, in the second position, the clutch disc 135 may be spaced apart from the set of clutch teeth 134; this would relate to... Figure 8 Further detailed description.

[0079] As discussed herein, the non-rotating plate 136 is coupled to the rotating plate 138 in such a way that rotational movement of the rotating plate 138 does not cause rotation of the non-rotating plate 136. However, axial movement of the non-rotating plate 136 causes the rotating plate 138 to move axially together with the non-rotating plate 136. Thus, when the non-rotating plate 136 moves between a first position and a second position, the rotating plate 138 follows the non-rotating plate 136.

[0080] Axial movement of the clutch disc 135 causes axial movement of the motor drive shaft 108 relative to the rotation axis 110. Specifically, the motor drive shaft 108 moves axially with the axial movement of the clutch disc 135 (based on whether a magnetic flux threshold is reached). Based on the movement of the clutch disc 135, the motor drive shaft 108 moves axially within the guide channel 182 relative to the rotation axis 110. Specifically, a plurality of spline teeth 118 move axially within the guide channel 182. Conversely, the guide channel 182 is envisioned to allow the plurality of spline teeth 118 to move freely axially within the guide channel 182 while maintaining contact with the rotor core 106, and to allow torque to be transmitted between the rotor core 106 and the motor drive shaft 108. (The remaining text appears to be unrelated and possibly a fragment from another document.) Figure 7 The configuration of the shaft lock 116 that allows this torque transmission is described in further detail.

[0081] The axial movement of the motor drive shaft 108 causes the engagement body 152 to move axially relative to the rotation axis 110. In other words, the axial movement of the clutch disc 135 between the first position and the second position ultimately causes the engagement body 152 to move axially relative to the rotation axis 110. When the clutch disc 135 is in the first position ( Figure 2 When the clutch disc 135 is in the first position, the engagement body 152 is not in contact with the engagement surface 170. Therefore, when the clutch disc 135 is in the first position, the engagement body 152, and thus the clutch assembly 130, is in the disengaged position. When the clutch disc 135 is in the second position, the engagement body 152 contacts the engagement surface 170. Therefore, when the clutch disc 135 is in the second position, the engagement body 152, and thus the clutch assembly 130, is in the engaged position.

[0082] When in the engaged position, the engagement body 170 transmits torque from the motor drive shaft 108 to an external drive shaft (e.g., turbine shaft 40) from the motor 100. When in the disengaged position, the engagement body 170 does not transmit torque from the motor drive shaft 108 to the external drive shaft (e.g., turbine shaft 40).

[0083] It will be recognized that the biasing element 140 biases the clutch disc 135 toward the first position ( Figure 2 Or otherwise bias away from the second position ( Figure 3It will be recognized that the first position is defined as the default position defined when the bias element 140 is in the unbiased position. The magnetic flux threshold is selected at least in part based on the spring constant of the bias element 140. When the magnetic flux threshold is reached (e.g., when the clutch plate 135 is in the unbiased position), Figure 3 When the second position is reached, the magnetic flux is large enough to overcome the force (limited by the spring constant of the bias element 140) applied axially away from the first rotor end 112 to the clutch plate 135 by the bias element 140. When the magnetic flux threshold is not reached (e.g., when the clutch plate 135 is in the second position), the magnetic flux is large enough to overcome the force (limited by the spring constant of the bias element 140) applied axially away from the first rotor end 112 by the bias element 140. Figure 2 In the first position, the magnetic flux is not large enough to overcome the force applied to the clutch disc 135 by the bias element 140. Therefore, the bias element 140 pushes the clutch disc 135 axially away from a set of clutch teeth 134 relative to the rotation axis 110.

[0084] Using a bias element 140 with a relatively low spring constant means that a lower magnetic flux threshold needs to be reached to move the non-rotating plate 136 to the second position. Conversely, using a bias element 140 with a relatively high spring constant means that a higher magnetic flux threshold needs to be reached to move the non-rotating plate 136 to the second position.

[0085] Clutch assembly 132 is movable between an engaged position and a disengaged position without the need for an external actuator (e.g., a motor), hereinafter referred to as an external clutch actuator. Instead, clutch assembly 132 is movable based on motor 100 itself. When current is supplied to a set of windings 128 (e.g., the motor is on) and a magnetic flux threshold is reached or exceeded, clutch assembly 132 automatically moves to the engaged position. When no current is supplied to the set of windings 128 (e.g., the motor is off) or the magnetic flux threshold is not reached in other ways, clutch assembly 132 remains in a default position (e.g., a first position).

[0086] Compared to conventional clutch assemblies that include an external clutch actuator, the automatic movement of the clutch assembly 132, which does not require an external clutch actuator, reduces the complexity of the clutch assembly 132. This reduction in the complexity of the clutch assembly 132, in turn, results in the HTS 10 being lighter and less complex to manufacture compared to the HTS with a conventional clutch assembly that includes an external clutch actuator.

[0087] Electric motor 100 can be used during various operating cycles of gas turbine engine 14. Figure 1 Specifically, HTS10, specifically electric motor 100, can be used during the start-up, restart, or shutdown process of gas turbine engine 14.

[0088] During the start-up process, pressurized air is supplied through the main airflow path 36, causing the turbine component 38 to rotate. The rotation of the turbine component 38 causes the turbine shaft 40 to rotate, which in turn causes the output shaft 78 to rotate. The rotation of the output shaft 78 initiates the rotation of various parts of the gas turbine engine 14 to enable it to start. The electric motor 100 can be switched on (e.g., current is supplied to a set of windings 128) such that the motor drive shaft 108 rotates about the rotation axis 110 and engages with the turbine shaft 40. Thus, the torque generated by the electric motor 100 is transmitted to the turbine shaft 40 and ultimately to the output shaft 78. The use of the electric motor 100 during the start-up process increases the torque output from the output shaft 78, which in turn reduces the amount of pressurized air supplied through the pressurized airflow path 36 to enable the gas turbine engine 14 to start.

[0089] During the restart process, the motor 100 starts the gas turbine engine 14 without using the pressurized air within the pressurized air flow path 36. As used herein, "restart" of the gas turbine engine 14 means that the gas turbine engine 14 has stopped passing through the combustion section 20 ( Figure 1 The combustion of fuel within the compression section 18 drives the compression section. Figure 1 ), High-pressure turbine zone 22 ( Figure 1 ), low-pressure turbine zone 24 ( Figure 1 (or a combination thereof), and situations where the gas turbine engine 14 cannot be driven without restarting or re-ignition. Restarting the gas turbine engine 14, like starting it, is accomplished by providing torque to the output shaft 78, causing the various parts of the gas turbine engine 14 to rotate. However, the difference is that during the starting of the gas turbine engine 14, the HTS 10 is connected to a ground trolley or another external air source that provides pressurized air to the main airflow path 36. However, during restarting, the ground trolley for the external air source is unavailable. Therefore, the motor 100 can be activated to generate torque on the output shaft 78 to restart the gas turbine engine 14.

[0090] During shutdown, motor 100 can operate without using pressurized air within pressurized air flow path 36. As used herein, the term "shutdown" refers to the intentional cessation of operation of gas turbine engine 14. During shutdown, gas turbine engine 14 decelerates, or otherwise reduces the rotational speed of compression section 18, high-pressure turbine section 22, and low-pressure turbine section 24. It is envisioned that producing a smooth and stable reduction in rotational speed helps ensure that gas turbine engine 14 is not damaged during shutdown. Specifically, producing a smooth and stable reduction in rotational speed ensures that the rotating parts of gas turbine engine 14 do not become kinked or deformed. During shutdown, motor 100 is used to provide variable torque to output shaft 78 and guide the rotating components of gas turbine engine 14 along the smooth and stable reduction in rotational speed.

[0091] It is envisioned that the electric motor 100 can be used during other functions of the gas turbine engine 14. As a non-limiting example, in some cases, the electric motor 100 can be activated to drive other components of the gas turbine engine 14, such as, but not limited to, the bleed air system. As a non-limiting example, the HTS 10 can be used during normal operation or shutdown of the gas turbine engine 14 to drive bleed air (e.g., cooling fluid, ambient airflow) through the bleed air system to cool various parts of the gas turbine engine 14 that require cooling (e.g., high-pressure turbine section 22 and low-pressure turbine section 24).

[0092] Although not shown, it will be appreciated that the HTS 10 may include or be coupled to a controller module having a processor and memory. The memory includes a set of executable commands or runtime instructions, and the processor is configured to execute the executable commands or otherwise provide runtime instructions to the HTS 10 or other parts of the gas turbine engine 14. The controller module may be configured to automatically control the operation of the HTS 10 and the motor 100. As a non-limiting example, the controller module may be coupled to a sensor that determines the speed of one or more rotating components of the gas turbine engine 14. During shutdown, the controller module may read the sensor and automatically control the motor 100 to provide the required torque to the output shaft 78 to produce a smooth and stable reduction in rotational speed as described herein.

[0093] Figure 4 yes Figure 2 A schematic cross-sectional view of a portion of the clutch assembly 132. The clutch assembly 132 includes a bearing assembly 142 that interconnects the non-rotating plate 136 and the rotating plate 138 of the clutch disc 135.

[0094] The bearing assembly 142 includes a set of bearings 144, a first bearing raceway 145, and a second bearing raceway 146. The set of bearings 144 may include various types of bearings, such as, but not limited to, ball bearings, roller bearings, needle roller bearings, journal bearings, etc. The first bearing raceway 145 is opposite to the second bearing raceway 146. The set of bearings 144 is located between the first bearing raceway 145 and the second bearing raceway 146 and is held in place by them.

[0095] The first bearing raceway 145 is connected to the non-rotating plate 136. Alternatively, the first bearing raceway 145 may be integrally formed with the non-rotating plate 136.

[0096] The second bearing raceway 146 is coupled to the rotating plate 138. As a non-limiting example, the second bearing raceway 146 includes a key 148, and the rotating plate 138 includes a groove 150. The key 148 is received in the groove 150 to effectively engage the second bearing raceway 146 to the rotating plate 138. It is contemplated that the second bearing raceway 146 can be screwed into the rotating plate 138 using the key 148 and the groove 150. Alternatively, the second bearing raceway 146 may be integrally formed with the rotating plate 138.

[0097] As discussed herein, the use of bearing assembly 142 rotatably isolates the non-rotating plate 136 from the rotating plate 138. Therefore, rotation of the rotating plate 138 about the rotation axis 110 does not cause rotation of the non-rotating plate 136 about the rotation axis 110. Bearing assembly 142 is configured such that axial movement of the non-rotating plate 136 relative to the rotation axis 110 causes axial movement of the rotating plate 138. Thus, the rotating plate 138 and the non-rotating plate 136 are together in a first position ( Figure 2 ) and the second position ( Figure 3 They move axially between each other.

[0098] Figure 5 yes Figure 2 A schematic perspective view of a portion of an electric motor 100. The electric motor 100 includes a stator 102 having a stator core 120 extending between a first stator end 122 and a second stator end 124. Figure 2 The motor 100 includes a set of slots 126 and a set of windings 128 having a set of end windings 162. The motor 100 has a motor drive shaft 108 rotatable about a rotation axis 110. Figure 2 Clutch assembly 132 includes clutch teeth 134.

[0099] Each end winding of a set of end windings 162 defines an opening 176. The opening 176 of each end winding in a set of end windings 162 is defined as a space or gap formed by a loop or turn in a set of windings 128 (e.g., a set of end windings 162).

[0100] Each clutch tooth in a set of clutch teeth 134 may include a first leg 164, a second leg 166, and a base 168. The first leg 164 and the second leg 166 extend from opposite ends of the base 168. The first leg 164, the second leg 166, and the base 168 together form the U-shaped profile of the clutch tooth.

[0101] A set of clutch teeth 134 is arranged such that a base 168 extends along a corresponding portion of the first stator end 122. A first leg 164 and a second leg 166 of each clutch tooth in the set of clutch teeth 134 extend axially away from the first stator end 122 relative to the axis of rotation 110. The base 168 of each tooth in the set of clutch teeth 134 extends through a corresponding portion of an opening 176 of a corresponding end winding of a set of end windings 162. The set of clutch teeth 134 is arranged such that the first leg 164 and the second leg 166 are located on radially opposite sides of the corresponding end windings (e.g., end windings in a set of end windings 162 through which the corresponding base extends) relative to the axis of rotation 110.

[0102] Each end winding of a set of end windings 162 includes a distal end 178. The first leg 164 and the second leg 166 are sized to extend axially beyond the distal end 178 of the corresponding (e.g., the nearest) end winding of the set of end windings 162 relative to the axis of rotation 110. In other words, each clutch tooth of a set of clutch teeth 134 extends axially beyond the set of end windings 162 relative to the axis of rotation 110.

[0103] A set of clutch teeth 134 includes any number of one or more clutch teeth. A set of slots 126 includes any number of one or more slots. It will be appreciated that each clutch tooth in the set of clutch teeth 134 corresponds to a single slot in the set of slots 126. Therefore, the total number of clutch teeth in the set of clutch teeth 134 is equal to the total number of slots in the set of slots 126. Alternatively, two clutch teeth in the set of clutch teeth 134 may correspond to a single slot in the set of slots 126. Therefore, the total number of clutch teeth in the set of clutch teeth 134 is greater than or equal to one times the total number of slots in the set of slots 126 and less than or equal to two times the total number of slots. The ratio between the total number of clutch teeth in the set of clutch teeth 134 and the total number of slots in the set of slots 126 depends on the configuration of the set of clutch teeth 134. As a non-limiting example, each clutch tooth in the set of clutch teeth 134 may have a U-shaped profile configuration, which will be described in further detail below. Therefore, the total number of clutch teeth in the set of clutch teeth 134 is equal to the total number of slots in the set of slots 126. As a non-limiting example, at least one clutch tooth in a set of clutch teeth 134 may have a J-shaped or L-shaped profile configuration, which will be described in further detail below. Therefore, the total number of clutch teeth in a set of clutch teeth 134 may be greater than the total number of slots in a set of slots 126.

[0104] A set of clutch teeth 134 is engaged with stator core 120. As a non-limiting example, each clutch tooth in the set of clutch teeth 134 may be welded to, fastened to (e.g., by fasteners such as screws), bolted to, bonded to, or otherwise engaged with a corresponding portion of stator core 120. Alternatively, the set of clutch teeth 134 may be integrally formed with stator core 120.

[0105] The geometry of a set of clutch teeth 134 (e.g., a U-shaped profile) provides a path for magnetic flux as discussed herein. Specifically, during operation of the motor 100, magnetic flux is conducted through the first leg 164, the second leg 166, and the base 168. When in the first position, the non-rotating plate 136 ( Figure 2 It contacts and abuts the axial distal end of at least one of the first leg 164, the second leg 166, or a combination thereof. The axial distal ends of the first leg 164 and the second leg 166 refer to the portions of the first leg 164 and the second leg 166 that are axially furthest from the base 168 relative to the axis of rotation 110.

[0106] Although described in terms of having a U-shaped profile, it will be appreciated that each clutch tooth in a set of clutch teeth 134 can have various configurations. As a non-limiting example, at least one clutch tooth in a set of clutch teeth 134 can be formed with a C-shaped profile. As a non-limiting example, at least one clutch tooth in a set of clutch teeth 134 can be formed with a single leg (e.g., only one of a first leg 164 or a second leg 166) and a base 168. At least one clutch tooth thus forms either a J-shaped profile or an L-shaped profile. Two clutch teeth in a set of clutch teeth 134 having a J-shaped or L-shaped profile can be positioned on radially opposite sides of the end windings of a set of windings 128 to collectively form a U-shaped profile, a C-shaped profile, etc.

[0107] Figure 6 It is HTS 10 ( Figure 2 A schematic perspective view of a portion of HTS 10. HTS 10 includes a motor 100 with a clutch assembly 132. Figure 2 Clutch assembly 132 includes engagement body 152. Motor 100 includes motor drive shaft 108 rotatable about rotation axis 110. Figure 2 HTS10 includes a turbine component 38 with an engagement surface 170. As shown, the clutch assembly 132, specifically the engagement body 152, is in the disengaged position, where the engagement body 152 is not in contact (or engaged) with the turbine component 38. Therefore, torque transmission from the motor drive shaft 108 to the turbine shaft 40 does not occur.

[0108] A first set of engagement teeth 172 extends from the engagement body 154. A second set of engagement teeth 174 extends from the engagement surface 170. The first set of engagement teeth 172 is located along a portion of the engagement body 152, which corresponds to the position of the second set of engagement teeth 174 along the engagement surface 170. In other words, the first set of engagement teeth 172 is radially aligned with the second set of engagement teeth 174 relative to the axis of rotation 11.

[0109] Each engagement tooth of the first set of engagement teeth 172 and the second set of engagement teeth 174 terminates circumferentially at a circumferential end 180 relative to the axis of rotation 110. Each engagement tooth of the first set of engagement teeth 172 and the second set of engagement teeth 174 may employ any suitable geometry. As a non-limiting example, the engagement teeth of the first set of engagement teeth 172 and the second set of engagement teeth 174 are formed as beveled surfaces extending circumferentially around the axis of rotation 110 to the circumferential end, and each has a non-constant axial height (H) from a corresponding portion of the engagement body 152 or the engagement surface 170. The maximum axial height (H) of each tooth in the first set of engagement teeth 172 and the second set of engagement teeth 174 occurs at least at the circumferential end 180.

[0110] The first set of engaging teeth 172 is configured to engage corresponding portions of the turbine shaft 40. Specifically, the first set of engaging teeth 172 is configured to engage the second set of engaging teeth 174. As used herein, the term "engagement" refers to the action of the first body entering and then maintaining contact with the second body. The first set of engaging teeth 172 is opposite to the second set of engaging teeth 174. Thus, when in the engaged position (e.g., Figure 2 When the first set of engagement teeth 172 circumferential ends 180 contact and abut against the circumferential ends 180 of the second set of engagement teeth 174. The contact between the circumferential ends 180 of the first set of engagement teeth 172 and the second set of engagement teeth 174 effectively locks the engagement body 152 into contact with the engagement surface 170 (e.g., turbine shaft 40).

[0111] The first set of engagement teeth 172 includes any number of one or more engagement teeth spaced circumferentially along corresponding portions of the engagement body 152 relative to the axis of rotation 110. The second set of engagement teeth 174 includes any number of one or more engagement teeth spaced circumferentially along corresponding portions of the engagement surface 170 relative to the axis of rotation 110. The total number of engagement teeth in the first set of engagement teeth 172 is equal to the total number of engagement teeth in the second set of engagement teeth 174.

[0112] Although the first set of engaging teeth 172 and the second set of engaging teeth 174 have been described in terms of beveled teeth or surfaces, it will be appreciated that the first set of engaging teeth 172 and the second set of engaging teeth 174 can take various forms. As a non-limiting example, the first set of engaging teeth 172 and the second set of engaging teeth 174 can be formed as a plurality of stepped or rectangular teeth. As a non-limiting example, the first set of engaging teeth 172 and the second set of engaging teeth 174 can be defined respectively by magnetic regions of opposite polarities of the engaging body 152 and the engaging surface 170. Thus, when the engaging body 152 moves axially toward the engaging surface 170, the magnetic material of the engaging body 152 is attracted to the magnetic material of the engaging surface 170, causing the engaging body 152 to remain in contact with the engaging surface 170.

[0113] It will be appreciated that the first set of engaging teeth 172 and the second set of engaging teeth 174 are formed to mesh together when they contact each other. In other words, the first set of engaging teeth 172 is formed to correspond to the second set of engaging teeth 174, such that when the first set of engaging teeth 172 contacts the second set of engaging teeth 174, the rotation of the first set of engaging teeth 172 (e.g., by means of...) Figure 2 The rotation of the motor drive shaft 108 causes the second set of engagement teeth 174 and the turbine shaft 40 to rotate.

[0114] Figure 7 Is it like along Figure 2 The schematic cross-sectional view of a portion of the motor 100 is shown along section line VII-VII. The motor 100 includes a rotor 104 and a motor drive shaft 108. The rotor 104 has a rotor core 106. The motor drive shaft 108 is rotatable about a rotation axis 110.

[0115] Shaft lock 116 interconnects motor drive shaft 108 and rotor 104. Shaft lock 116 may include a plurality of spline teeth 118. The plurality of spline teeth 118 includes, for example, a second set of spline teeth 186. The plurality of spline teeth 118 defines local radial protrusions extending from the respective bodies (e.g., motor drive shaft 108 or rotor core 106).

[0116] A plurality of spline teeth 118 are received within a guide channel 182. The guide channel 182 is formed to follow the contour of the plurality of spline teeth 118. In other words, the plurality of spline teeth 118 may be received within the guide channel 182 such that the periphery (e.g., outer surface) of the plurality of spline teeth 118 contacts the guide channel 182.

[0117] As discussed herein, the multiple spline teeth 118 are axially movable relative to the rotation axis 110 within the guide channel 182. When the rotor 104 rotates circumferentially about the rotation axis 110, the rotational torque of the rotor 104 is transmitted to the motor drive shaft 108 because the multiple spline teeth 118 are in direct contact with the guide channel 182. In other words, the multiple spline teeth 118 are circumferentially constrained within the guide channel 182. Therefore, the circumferential movement of the motor drive shaft 108 depends on the circumferential movement of the rotor 104 about the rotation axis 110.

[0118] Figure 8 It is suitable for use as Figure 1 A schematic cross-sectional view of a section of an exemplary hybrid turbo starter 210 of the hybrid turbo starter 10. The hybrid turbo starter 210 is similar to the hybrid turbo starter 10; therefore, similar parts will be identified by similar numbers plus 200, and it is understood that, unless otherwise stated, the description of the hybrid turbo starter 10 also applies to the hybrid turbo starter 210.

[0119] The hybrid turbine starter 210 includes an electric motor 300. The electric motor 300 has a rotor 304, a stator 302, a motor drive shaft 308, and a clutch assembly 332. The stator 302 has a stator core 320 terminating at stator ends 322 (e.g., Figure 2 The first stator end 122). The stator 302 includes a set of windings 328 received in a set of slots 326. The rotor 304 has a rotor core 306 that terminates at a rotor end 312 (e.g., at the first stator end 122). The stator 302 includes a set of windings 328 received in a set of slots 326. The rotor 304 has a rotor core 306 that terminates Figure 2 The first rotor end 214). The motor drive shaft 308 can rotate around the rotation axis 310.

[0120] Clutch assembly 332 includes clutch disc 335, a set of clutch teeth 334, and a biasing element 340. Clutch assembly 332 includes a shaft lock 316, which includes a set of spline teeth 318. Although not shown, clutch assembly 332 may include additional components, such as, but not limited to, engagement bodies (e.g., Figure 2 (The engaging body 152). The clutch disc 335 is movable between a first position and a second position. The movement of the clutch disc 335 between the first position and the second position causes the clutch assembly 332 to move between a disengaged position and an engaged position, respectively.

[0121] Clutch assembly 332 and clutch assembly 130 ( Figure 2 The similarity to the clutch assembly 332 is that it includes a clutch disc 335. However, the clutch disc 335 is a single-piece configuration. In other words, the clutch disc 335 consists of a single disc, rather than two discs (e.g., Figure 2(Rotating plate 138 and non-rotating plate 136). As a non-limiting example, clutch plate 335 includes only rotating plate 338. Rotating plate 338 is coupled to motor drive shaft 308 such that rotating plate 338 and therefore clutch plate 335 rotate circumferentially with motor drive shaft 308 relative to rotation axis 310.

[0122] A clearance (G) is formed axially between a corresponding portion of the clutch disc 335 and a set of clutch teeth 334. When the clutch disc 335 is a rotating disc 338, the clearance (G) is non-zero in both the first and second positions. In other words, when in the second position (clutch assembly 332 engaged) and the clutch disc 335 is a rotating disc 338, the clearance (G) is non-zero, preventing the clutch disc 335 from contacting the set of clutch teeth 334. It is particularly important that the clearance (G) between the first and second positions be set to be non-zero when the clutch disc 335 is a rotating disc 338. Always setting the clearance (G) to be non-zero ensures that the rotating disc 338 does not contact and rotate against a corresponding portion of the set of clutch teeth 334. If the clutch disc 335 is allowed to rotate freely against the set of clutch teeth 334, the set of clutch teeth 334 can wear on the clutch disc 335, or vice versa.

[0123] The size of the clearance (G) is set by one or more portions of the clutch assembly 332. As a non-limiting example, the size of the biasing element 340 may be set (e.g., the spring constant may be selected such that the force exerted by the biasing element 340 on the clutch disc 335 exceeds the attractive force from the magnetic field generated by the motor 300. Thus, the biasing element 340 prevents further axial movement of the clutch disc 335 toward a set of clutch teeth 334. Alternatively, the axial movement of the clutch disc 335 may be stopped once the corresponding portion of the clutch assembly 332 (e.g., the engagement body) enters the engaged position.

[0124] Although described with respect to rotating plate 338, it will be appreciated that clutch plate 335 may be formed only as a non-rotating plate (e.g., non-rotating plate 136). Additional structures may be included to rotatably isolate the non-rotating plates of clutch plate 335 from the motor drive shaft 308. As a non-limiting example, bearing assemblies (e.g., Figure 2 The bearing assembly 142 may be formed between the clutch disc 335 and the motor drive shaft 308. In all cases, axial movement of the clutch disc 335 between the first and second positions causes the clutch assembly 332 to move axially relative to the rotation axis 310 between a disengaged position and an engaged position. If the clutch disc 335 is formed as a non-rotating disc, it will be recognized that the clearance (G) can reach zero because the clutch disc 335 does not rotate against a set of clutch teeth 334.

[0125] Regarding clutch assembly 130, clutch assembly 332 has a less complex design. Specifically, clutch disc 335 does not have a two-piece configuration like clutch disc 135. Figure 2 This reduces the overall complexity of the clutch assembly 332.

[0126] The benefits of this disclosure include that the HTS has a motor with a clutch assembly that has reduced complexity compared to conventional clutch assemblies. Specifically, a conventional clutch assembly includes a clutch actuator, for example, in the form of a motor. This motor operates independently of the HTS motor and requires its own power source. As described herein, the HTS includes a clutch assembly that can move between a disengaged position and an engaged position without a clutch actuator. Instead, the clutch assembly utilizes the magnetic flux of the motor to move the clutch assembly between the engaged and disengaged positions, thus eliminating the need for an external clutch actuator.

[0127] Compared to clutch assemblies with integrated clutch actuators, eliminating the external clutch actuator reduces the footprint of the clutch assembly. This reduced footprint, in turn, decreases the size of the HTS (Heated Turbine System), thus allowing for easier integration of the HTS with the gas turbine engine.

[0128] Eliminating the need for an external clutch actuator by using the clutch assembly for automatic movement based on magnetic flux reduces the complexity of the clutch assembly. Specifically, as described herein, the clutch assembly is responsive to magnetic flux and a flux threshold. Movement between the engaged and disengaged positions is achieved without the need for a control system (e.g., a controller module) to send timing commands to the clutch assembly. The use of a control system in a clutch assembly increases its complexity and cost compared to the clutch assembly described herein.

[0129] As described herein, the clutch assembly effectively utilizes the magnetic flux leaking from one set of windings (hereinafter referred to as "end winding leakage flux"). In conventional motors, end winding leakage flux is not used. Instead, a portion of the total magnetic flux (defined by end winding leakage flux) remains unused. However, the motor described herein utilizes at least a portion of the end winding leakage flux that would otherwise be unused. Consequently, the motor described herein is more efficient than conventional motors.

[0130] In the absence of description, various features and structures of different embodiments may be combined or substituted for each other as desired. The fact that a feature is not shown in all embodiments does not mean that it could not be shown, but rather that it is done for the sake of brevity. Therefore, various features of different embodiments may be mixed and matched as needed to form new embodiments, whether or not the new embodiments are explicitly described. All combinations or permutations of the features described herein are covered by this disclosure.

[0131] This written description uses examples to illustrate aspects of the disclosure herein, including the best mode, and also enables any person skilled in the art to implement aspects of this disclosure, including making and using any apparatus or system, and performing any incorporated methods. The patent scope of aspects of this disclosure is defined by the claims and may include other examples that would occur to a person skilled in the art. Such other examples are expected to be within the scope of the claims if they have structural elements that are not different from the written language of the claims, or if they include equivalent structural elements that are not substantially different from the written language of the claims.

[0132] Other aspects are provided by the subject of the following clauses: An electric motor for a gas turbine engine includes: a rotor rotatable about a rotation axis; a motor drive shaft rotatably driven by the rotor; a stator having a stator core and a set of windings, the stator core extending axially between a first stator end and a second stator end relative to the rotation axis; and a clutch assembly including: an engagement body with the motor drive shaft defining a rotational output of the motor; a set of clutch teeth located along the first stator end; and a clutch disc coupled to the motor drive shaft, the clutch disc being movable between a first position defining a disengaged position of the clutch assembly and a second position defining an engaged position of the clutch assembly, wherein in the engaged position, the engagement body transmits torque from the motor drive shaft to an external drive shaft outside the motor, wherein the movement of the clutch disc is based on a magnetic flux generated by the set of windings.

[0133] The motor of any of the foregoing provisions, wherein the clutch assembly further includes a biasing element configured to bias the clutch disc toward a first position.

[0134] Any motor in the foregoing clauses, wherein the clutch plates include rotating plates and non-rotating plates.

[0135] Any motor in the foregoing clauses, wherein the biasing element extends axially between the rotor and the rotating plates.

[0136] Any motor in the foregoing clauses, wherein the engaging body includes a set of engaging teeth configured to engage a corresponding portion of the external drive shaft.

[0137] In any of the foregoing provisions, each of the engagement teeth in a set of engagement teeth is defined by a beveled surface extending circumferentially along the corresponding portion of the engagement body.

[0138] Any of the foregoing provisions regarding motors, wherein the coupling body is integrally formed with the motor drive shaft.

[0139] Any motor in the foregoing clauses, wherein the coupling body is threaded to the motor drive shaft at the threaded area.

[0140] Any motor in the foregoing clauses, wherein each of the engagement teeth in a set of engagement teeth is rectangular.

[0141] Any motor included in the foregoing clauses, wherein the motor is included in a hybrid turbine starter (HTS).

[0142] Any motor in the foregoing clauses, wherein the external drive shaft is a turbine shaft rotatably coupled to the turbine component, and the HTS includes an output shaft coupled to the turbine shaft.

[0143] Any of the aforementioned motors, wherein the output shaft is connected to the drive shaft of a gas turbine engine.

[0144] The electric motor in any of the foregoing clauses, wherein the gas turbine engine includes a compressor section, a combustion section and a turbine section arranged in series.

[0145] Any motor as described in the foregoing clauses, wherein the drive shaft rotatably connects the turbine section to the compressor section.

[0146] Any motor in the foregoing clauses, wherein the turbine components and the motor are housed within an integral housing.

[0147] Any motor in the foregoing clauses, wherein the clutch disc is a two-piece configuration having a rotating disc and a non-rotating disc coupled to the rotating disc.

[0148] Any motor in the foregoing clauses, wherein the clutch assembly includes a bearing assembly that engages the non-rotating plates with the rotating plates.

[0149] The motor of any of the foregoing provisions, wherein the clutch assembly further includes a biasing element configured to bias the plates toward a first position.

[0150] Any motor in the foregoing clauses, wherein the biasing element extends axially between the rotor and the rotating plates.

[0151] Any of the foregoing provisions concerning an electric motor in which the rotating plates are integrally formed with the motor drive shaft.

[0152] Any motor in the foregoing clauses, wherein the bearing assembly is connected to the non-rotating plate via a key and slot.

[0153] Any of the foregoing provisions for an electric motor, wherein the bearing assembly includes a key and the rotating plates include slots.

[0154] Any motor in the foregoing clauses, wherein the bearing assembly rotatably isolates the non-rotating plates from the motor drive shaft.

[0155] Any motor in the foregoing clauses, wherein the clutch disc is a one-piece configuration.

[0156] Any motor in the foregoing clauses, wherein the clutch disc has a rotating disc that rotates circumferentially together with the motor drive shaft.

[0157] Any motor of the foregoing provisions, wherein a clearance is formed axially relative to the axis of rotation between a clutch disc and a set of clutch teeth, wherein the clearance is non-zero in both the first and second positions.

[0158] Any motor in the foregoing clauses, wherein a shaft lock is formed between the rotor and the motor drive shaft.

[0159] Any motor in the foregoing clauses, wherein the rotor includes a guide channel, and the motor drive shaft includes a plurality of splines received within the guide channel, the guide channel and the plurality of splines together forming a shaft lock.

[0160] Any motor as described in the foregoing clauses, wherein multiple spline teeth can move axially within the guide channel.

[0161] Any motor in the foregoing clauses, wherein multiple spline teeth are circumferentially constrained within the guide channel.

[0162] Any motor of the foregoing provisions, wherein a set of windings includes a set of end windings, wherein each end winding in the set of end windings defines an opening, and a set of clutch teeth extends through the opening of the set of end windings.

[0163] Any motor as described in the foregoing clauses, wherein the motor includes a set of slots through which a set of windings extends, and the total number of clutch teeth in a set of clutch teeth is equal to the total number of slots in the set of slots.

[0164] Any motor of the foregoing provisions, wherein each of a set of clutch teeth has a base extending along a corresponding portion of a first stator end, and a leg extending axially outward from the base.

[0165] Any motor of the foregoing, wherein the legs extend axially beyond the far end of the nearest end winding of a set of end windings.

[0166] Any motor in the foregoing clauses, wherein the legs and base together form an L-shaped profile.

[0167] Any motor of the foregoing provisions, wherein each clutch tooth in a set of clutch teeth includes a first leg and a second leg extending radially opposite portions of the base.

[0168] Any motor of the foregoing clauses, wherein the first leg, the second leg, and the base together form a U-shaped profile.

[0169] Any motor of the foregoing clauses, wherein the first leg, the second leg, and the base together form a C-shaped profile.

[0170] Any motor in the foregoing clauses, wherein the clutch disc comprises a first ferrous material and a set of clutch teeth comprises a second ferrous material.

[0171] Any of the foregoing provisions for an electric motor, wherein the first ferrous material and the second ferrous material are each the same magnetic material.

[0172] A clutch assembly for an electric motor having a rotor rotatable about a rotation axis, an electric motor drive shaft rotatably driven by the rotor, and a stator extending between a first stator end and a second stator end, the electric motor being used with a turbine engine, the clutch assembly comprising: an engagement body having the electric motor drive shaft and defining a rotational output of the electric motor; a set of clutch teeth located along the first stator end; and a clutch disc coupled to the electric motor drive shaft, the clutch disc being movable between a first position defining a disengaged position of the clutch assembly and a second position defining an engaged position of the clutch assembly, wherein in the engaged position, the engagement body transmits torque from the electric motor drive shaft to an external drive shaft outside the electric motor, wherein the movement of the clutch disc is based on a magnetic flux generated by a set of windings.

[0173] The clutch assembly of any of the foregoing provisions, wherein the clutch assembly further includes a biasing element configured to bias the clutch disc toward a first position.

[0174] Any clutch assembly as described in the foregoing clauses, wherein the clutch plates include rotating plates and non-rotating plates.

[0175] Any clutch assembly of the foregoing clauses, wherein the biasing element extends axially between the rotor and the rotating plate.

[0176] Any clutch assembly of the foregoing provisions, wherein the engagement body includes a set of engagement teeth configured to engage a corresponding portion of the external drive shaft.

[0177] In any of the foregoing provisions, each of the engagement teeth in a set of engagement teeth is defined by a beveled surface extending circumferentially along a corresponding portion of the engagement body.

[0178] The clutch assembly of any of the foregoing clauses, wherein the engagement body is integrally formed with the motor drive shaft.

[0179] Any clutch assembly as described in the foregoing clauses, wherein the engagement body is threadedly connected to the motor drive shaft at the threaded area.

[0180] Any clutch assembly of the foregoing clauses, wherein each of the engagement teeth in a set of engagement teeth is rectangular.

[0181] Any clutch assembly of the foregoing clauses, wherein the motor is included in a hybrid turbine starter.

[0182] Any clutch assembly of the foregoing clauses, wherein the external drive shaft is rotatably coupled to the turbine shaft of the turbine component.

[0183] The clutch assembly of any of the foregoing provisions, wherein the output shaft is coupled to the drive shaft of the gas turbine engine.

[0184] The clutch assembly of any of the foregoing provisions, wherein the gas turbine engine includes a compressor section, a combustion section and a turbine section arranged in series flow.

[0185] Any clutch assembly of the foregoing clauses, wherein the drive shaft rotatably connects the turbine section to the compressor section.

[0186] Any clutch assembly as described in the foregoing clauses, wherein the turbine components and the motor are housed within an integral housing.

[0187] Any clutch assembly of the foregoing clauses, wherein the clutch disc is a two-piece configuration having a rotating disc and a non-rotating disc coupled to the rotating disc.

[0188] Any clutch assembly as described in the foregoing clauses, wherein the clutch assembly includes a bearing assembly that engages a non-rotating disc with a rotating disc.

[0189] The clutch assembly of any of the foregoing provisions, wherein the clutch assembly further includes a biasing element configured to bias the plates toward a first position.

[0190] Any clutch assembly of the foregoing clauses, wherein the biasing element extends axially between the rotor and the rotating plate.

[0191] The clutch assembly of any of the foregoing clauses, wherein the rotating plates are integrally formed with the motor drive shaft.

[0192] Any clutch assembly as described in the foregoing clauses, wherein the bearing assembly is connected to the non-rotating disc via a key and groove.

[0193] Any clutch assembly as described in the foregoing clauses, wherein the bearing assembly includes a key and the rotating plate includes a groove.

[0194] Any clutch assembly as described in the foregoing clauses, wherein the bearing assembly rotatably isolates the non-rotating discs from the motor drive shaft.

[0195] Any clutch assembly as described in the foregoing clauses, wherein the clutch disc is a one-piece configuration.

[0196] The clutch assembly of any of the foregoing clauses, wherein the clutch disc has a rotating disc that rotates circumferentially together with the motor drive shaft.

[0197] The clutch assembly of any of the foregoing provisions, wherein a clearance is formed axially relative to the axis of rotation between the clutch disc and a set of clutch teeth, wherein the clearance is non-zero in both the first and second positions.

[0198] Any clutch assembly of the foregoing clauses, wherein a shaft lock is formed between the rotor and the motor drive shaft.

[0199] Any clutch assembly of the foregoing clauses, wherein the rotor includes a guide channel and the motor drive shaft includes a plurality of splines received within the guide channel, the guide channel and the plurality of splines together forming a shaft lock.

[0200] Any clutch assembly as described in the foregoing clauses, wherein a plurality of spline teeth are axially movable within a guide channel.

[0201] Any clutch assembly as described in the foregoing clauses, wherein multiple spline teeth are circumferentially constrained within a guide channel.

[0202] Any clutch assembly of the foregoing provisions, wherein a set of windings includes a set of end windings, wherein each end winding of the set of end windings defines an opening, and a set of clutch teeth extends through the opening of the set of end windings.

[0203] Any clutch assembly of the foregoing clauses, wherein the motor includes a set of slots through which a set of windings extends, and the total number of clutch teeth in a set of clutch teeth is equal to the total number of slots in the set of slots.

[0204] The clutch assembly of any of the foregoing provisions, wherein each of a set of clutch teeth has a base extending along a corresponding portion of a first stator end, and a leg extending axially outward from the base.

[0205] Any clutch assembly of the foregoing provisions, wherein the leg extends axially beyond the distal end of the nearest end winding of a set of end windings.

[0206] Any clutch assembly of the foregoing clauses, wherein the legs and base together form an L-shaped profile.

[0207] Any clutch assembly of the foregoing provisions, wherein each clutch tooth in a set of clutch teeth includes a first leg and a second leg extending radially opposite portions of the base.

[0208] Any clutch assembly of the foregoing clauses, wherein the first leg, the second leg, and the base together form a U-shaped profile.

[0209] Any clutch assembly of the foregoing clauses, wherein the first leg, the second leg, and the base together form a C-shaped profile.

[0210] The clutch assembly of any of the foregoing provisions, wherein the clutch disc comprises a first ferrous material and a set of clutch teeth comprises a second ferrous material.

[0211] The clutch assembly of any of the foregoing provisions, wherein the first ferrous material and the second ferrous material are each the same magnetic material.

[0212] The clutch assembly of any of the foregoing provisions, wherein the engagement body is configured to transmit torque from the motor drive shaft to an external drive shaft located outside the motor.

[0213] Any clutch assembly of the foregoing clauses, wherein the motor is included in a hybrid turbine starter.

Claims

1. An electric motor for a gas turbine engine, the electric motor comprising: A rotor that can rotate around an axis of rotation; A motor drive shaft that is rotatably driven by the rotor; A stator having a stator core and a set of windings, the stator core extending axially between a first stator end and a second stator end relative to the axis of rotation; as well as Clutch assembly, comprising: The motor drive shaft is provided with a coupling body, which defines the rotational output of the motor; A set of clutch teeth located along the first stator end; and A clutch disc is coupled to the motor drive shaft and is movable between a first position and a second position, the first position defining a disengaged position of the clutch assembly and the second position defining an engaged position of the clutch assembly, at which the engagement body transmits torque from the motor drive shaft to an external drive shaft outside the motor, wherein the movement of the clutch disc is based on magnetic flux generated by the set of windings.

2. The motor according to claim 1, wherein, The clutch assembly further includes a biasing element configured to bias the clutch disc toward the first position.

3. The motor according to claim 1, wherein, The coupling includes a set of engagement teeth configured to engage a corresponding portion of the external drive shaft.

4. The motor according to claim 1, wherein, The motor is included in a hybrid turbine starter (HTS).

5. The motor according to claim 4, wherein, The external drive shaft is a turbine shaft rotatably connected to the turbine component, and the HTS includes an output shaft connected to the turbine shaft.

6. The motor according to claim 1, wherein, The clutch disc is a two-piece configuration having a rotating disc and a non-rotating disc connected to the rotating disc.

7. The motor according to claim 6, wherein, The clutch assembly includes a bearing assembly that connects the non-rotating plate to the rotating plate.

8. The motor according to claim 1, wherein, The clutch disc is a single-piece configuration.

9. The motor according to claim 8, wherein, A clearance is formed axially relative to the axis of rotation between the clutch disc and the set of clutch teeth, wherein the clearance is non-zero in both the first position and the second position.

10. A clutch assembly for an electric motor, the electric motor having a rotor rotatable about a rotation axis, an electric motor drive shaft rotatably driven by the rotor, and a stator extending between a first stator end and a second stator end, the electric motor being used with a turbine engine, the clutch assembly comprising: The motor drive shaft is provided with a coupling body, which defines the rotational output of the motor; A set of clutch teeth located along the first stator end; as well as A clutch disc is coupled to the motor drive shaft and is movable between a first position and a second position, the first position defining a disengaged position of the clutch assembly and the second position defining an engaged position of the clutch assembly, at which the engagement body transmits torque from the motor drive shaft to an external drive shaft outside the motor, wherein the movement of the clutch disc is based on magnetic flux generated by the set of windings.

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