Damping system for an electric supercharger

Abstract

The compressor assembly includes a shaft and a compressor wheel supported on the shaft. The compressor assembly further includes an electric motor having a stator and a rotor. The electric motor is configured to rotate the shaft and the compressor wheel. The compressor assembly further includes a housing assembly configured to accommodate at least a portion of the stator, the rotor, and the shaft. The housing assembly includes a first member and a second member. Additionally, the compressor assembly includes a damper disposed between the first member and the second member of the housing assembly. The damper is configured to elastically deform to provide damping to a force transmitted between the first member and the second member of the housing assembly.

Description

Technical Field

[0001] The present disclosure generally relates to electric drive compressor assemblies such as electric superchargers (e-chargers), and more particularly, to a damping system for an electric supercharger. Background Art

[0002] Some vehicles include turbochargers, superchargers, and / or other devices for enhancing the performance of an internal combustion engine. More specifically, these devices can increase the efficiency and power output of the engine by forcing additional air into the engine's combustion chamber.

[0003] In some cases, a vehicle may include an electric drive compressor or electric supercharger for these purposes. However, conventional electric superchargers can be bulky, costly, and / or may have other problems.

[0004] Accordingly, it is desirable to provide an electric supercharger that is more compact than conventional electric superchargers. Moreover, it is desirable to provide an electric supercharger that is cost-saving compared to conventional electric superchargers. In conjunction with the discussion of this background art in connection with the accompanying drawings, other desirable features and characteristics of the present disclosure will become apparent from the subsequent detailed description and the appended claims. Summary of the Invention

[0005] In one embodiment, an electric drive compressor assembly is disclosed. The electric drive compressor assembly includes a shaft and a compressor wheel supported on the shaft. The compressor assembly further includes an electric motor having a stator and a rotor. The electric motor is configured to rotate the shaft and the compressor wheel. The compressor assembly further includes a housing assembly configured to house at least a portion of the stator, the rotor, and the shaft. The housing assembly includes a first member and a second member. Additionally, the compressor assembly includes a damper disposed between the first member and the second member of the housing assembly. The damper is configured to elastically deform to provide damping to a force transmitted between the first member and the second member of the housing assembly.

[0006] In another embodiment, a method of manufacturing an electric drive compressor assembly is disclosed. The method includes providing a first member and a second member of a housing assembly. The method further includes supporting a shaft on the first member for rotation relative to the first member. A compressor wheel is supported on the shaft. The method further includes housing an electric motor within the housing assembly between the first member and the second member. The electric motor is configured to rotate the shaft and the compressor wheel. Additionally, the method includes attaching the first member and the second member together with a damper disposed between the first member and the second member. The damper is configured to elastically deform to provide damping to a force transmitted between the first member and the second member of the housing assembly.

[0007] In another embodiment, an electric supercharger is disclosed, the electric supercharger including a shaft and a compressor wheel having a plurality of blades. The compressor wheel is fixed to the shaft for rotation about an axis. The electric supercharger further includes an electric motor having a stator and a rotor. The rotor is fixed to the shaft. The stator receives the rotor and a portion of the shaft. The electric motor is configured to rotate the shaft and the compressor wheel about the axis. Additionally, the electric supercharger includes a housing assembly having a compressor section and a motor section. The compressor section is configured to house the compressor wheel, and the motor section is configured to house the stator and the rotor. The motor section includes a first member and a second member. The shaft extends through the second member to be received in the compressor section and the motor section. Moreover, the electric supercharger includes a bearing attached to the second member of the housing assembly and attached to the shaft. The bearing supports the shaft for rotation about the axis relative to the second member. Further, the electric supercharger includes a damper disposed between the first member and the second member of the housing assembly. The damper is configured to elastically deform to provide damping to a force transmitted between the first member and the second member of the housing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present disclosure will be described in conjunction with the following drawings, in which like reference numerals indicate like elements, and in which:

[0009] Figure 1 is a schematic view of a vehicle engine system including an electric supercharger according to an exemplary embodiment of the present disclosure;

[0010] Figure 2 is Figure 1 a perspective view of the electric supercharger, with some features hidden to show the internal components of the electric supercharger;

[0011] Figure 3 is along Figure 2 line 3-3 of the electric supercharger taken a cross-sectional view;

[0012] Figure 4 is Figure 3 a detailed cross-sectional view of a portion of the electric supercharger indicated in; and

[0013] Figure 5 is along Figure 3 line 5-5 of the turbocharger taken a cross-sectional view. DETAILED DESCRIPTION

[0014] The following detailed description is merely exemplary in nature and is not intended to limit the present disclosure or the application and uses of the present disclosure. Further, no intention is made to be bound by any theory presented in the foregoing background or the following detailed description.

[0015] Generally, the exemplary embodiments disclosed herein include a damping system for an electrically powered compressor (i.e., an electric supercharger). One or more dampers may be provided to provide damping for forces that translate through the electric supercharger and / or the support structure.

[0016] In particular, the damper may be elastically deformable. The damper may also include one or more surface features, shapes, dimensions, materials, and / or other elements that provide improved damping. Additionally, the damper may be included within the damping system in a manner that improves the damping function of the damping system. For example, the damper may be disposed between different components of the housing assembly, and the damper may be supported by these components to provide effective damping for forces transmitted through the housing assembly. Additionally, the damping system may allow certain types of bearings to be included in the electric supercharger for additional benefits. Further, due to one or more features of the present disclosure, the damping system may provide manufacturing efficiency. Additional details of the present disclosure will be discussed below.

[0017] Figure 1 is a schematic view of an exemplary electric supercharger 100 of the present disclosure. Generally, the electric supercharger 100 may include an electric supercharger housing assembly 101 and a shaft 103. The shaft 103 is configured to rotate about a rotational axis 105 within the electric supercharger housing assembly 101. A compressor wheel 104 may be mounted on the shaft 103. The electric supercharger 100 may also include an electric motor 108 configured to rotate the shaft 103 and the compressor wheel 104. Accordingly, the compressor wheel 104 may receive an inlet air flow 113 and output a pressurized air flow 115 to a downstream component.

[0018] In some embodiments, the electric supercharger 100 may be disposed within a vehicle. Additionally, in some embodiments, the electric supercharger 100 may be included in a vehicle that includes a turbocharger 12.

[0019] The turbocharger 12 may be conventional and may include a turbocharger housing 114 and a rotor 116. The rotor 116 is configured to rotate about a rotor rotational axis 118 within the turbocharger housing 114.

[0020] The turbocharger 112 includes a turbine section 119 configured to circumferentially receive a high-pressure and high-temperature exhaust gas flow 130 from an engine (e.g., from an exhaust manifold 132 of an internal combustion engine 134 or other type of engine). The high-pressure and high-temperature exhaust gas flow 130 drives a turbine wheel 126 (and thus the rotor 116) to rotate about the rotor rotational axis 118, thereby becoming a low-pressure and low-temperature exhaust gas flow 136 that is released into a downstream exhaust pipe 138.

[0021] The turbocharger 112 also includes a compressor section 121 having a compressor wheel 128 that is driven to rotate by an exhaust-driven turbine wheel 126. The compressor wheel 128 is configured to compress the received input air 140 into a pressurized air stream 142. Due to the compression process, the pressurized air stream 142 is characterized by an elevated temperature that is higher than the temperature of the input air 140.

[0022] The air stream 142 can be directed through an air cooler 144 (i.e., an intercooler), such as a convective-cooled charge air cooler. The air cooler 144 can be configured to dissipate heat from the air stream 142, thereby increasing its density. The resulting cooled and pressurized air stream 146 is directed into the intake manifold 148 of the internal combustion engine 134 or, alternatively, is directed into a subsequent stage of a series of compressors. Operation of the system can be controlled by an ECU 150 (engine control unit) that is connected via a communication link 152 to the remainder of the system.

[0023] As Figure 1 schematically illustrated, the electric supercharger 100 can be disposed upstream of the turbocharger 112. For example, the air stream 115 output from the electric supercharger 100 can be mixed with the exhaust stream 130 and / or otherwise provide an air input to the turbine section 119 to rotate the turbine wheel 126 and thus cause the compressor wheel 128 of the turbocharger 112 to rotate. However, it will be understood that the electric supercharger 100 can be included in the vehicle in different ways without departing from the scope of the present disclosure. For example, in some embodiments, the electric supercharger 100 can be disposed downstream of the turbocharger 112. In both cases, the electric supercharger 100 can feed air to the engine 134. The electric supercharger 100 can shorten the transient time and reduce turbo lag. The electric supercharger 100 can also provide benefits such as reduced emissions, improved fuel efficiency, etc. Moreover, due to the inclusion of the electric supercharger 100, the size of the turbocharger 112 can be reduced.

[0024] Furthermore, it will be understood that the electric supercharger 100 can be included in a system that does not include a turbocharger 112. For example, in additional embodiments, the electric supercharger 100 can be configured to feed air to a fuel cell of the vehicle.

[0025] In addition, it will be understood that the term "electric supercharger" as used herein will be broadly interpreted to include, for example: devices with an electrically driven compressor wheel regardless of where the electric supercharger is included, systems of the type in which the electric supercharger is included, and the like. It will also be understood that the electric supercharger of the present disclosure may also be referred to as an electric drive compressor assembly. Moreover, the electric supercharger of the present disclosure may be configured as an electric supercharger, a hybrid turbocharger, an e-boost device, or other related components.

[0026] Now referring to Figure 2 and Figure 3 , the electric supercharger 100 will be discussed in more detail according to an exemplary embodiment. As mentioned above, the electric supercharger 100 generally may include a housing assembly 101, a shaft 103, a compressor wheel 104, and an electric motor 108.

[0027] The shaft 103 may be generally cylindrical and may include a first end 154, a second end 156, and an intermediate section 157 extending between the first and second ends 154, 156. The compressor wheel 104 may be fixed to and supported on the shaft 103 adjacent the first end 154. The compressor wheel 104 may include a plurality of radially extending vanes 158.

[0028] The electric motor 108 may include a rotor 160. The rotor 160 may be fixed to the intermediate section 157 of the shaft 103. Thus, the rotor 160 and the shaft 103 may rotate as a unit about the axis of rotation 105. The electric motor 108 may also include a stator 162, as shown in Figure 3 . (The stator 162 is hidden in Figure 2 to better illustrate other components.) The stator 162 may be cylindrical and hollow such that the intermediate section 157 of the shaft 103 and the rotor 160 are received within the stator 162.

[0029] The electric motor 108 may also include an electrical module 164. The electrical module 164 may include electrical devices such as an inverter, circuits, a controller for the electric motor 108, and / or other components. Thus, during operation, the electrical module 164 may control the electric motor 108 such that the shaft 103 and the rotor 160 rotate about the axis of rotation 105 relative to the stator 162 to rotationally drive the compressor wheel 104.

[0030] The housing assembly 101 may include a plurality of components that are assembled together to at least partially house, surround, enclose, and / or encapsulate the compressor wheel 104, the shaft 103, and the electric motor 108. The housing assembly 101 may be configured to provide certain advantages related to manufacturability and / or other factors, as will be discussed in detail below.

[0031] As Figure 3As shown, the housing assembly 101 may generally include a compressor section 166 that houses a compressor wheel 104. The housing assembly 101 may generally further include an electrical module section 168 that houses an electrical module 164. Moreover, the housing assembly 101 may generally include a motor section 170 that houses an electric motor 108.

[0032] The compressor section 166 of the housing assembly 101 may include a volute member 172. The volute member 172 may include an inlet 173 that may be directed along an axis 105. The volute member 172 may further include an outlet (not shown) that provides air along an air flow 115 ( Figure 1 )). The volute member 172 may further include an inner surface 175 having a volute shape that circumferentially extends around the axis 105. During operation of the electric supercharger 100, the inner surface 175 may cooperate with the blades 158 of the compressor wheel 104 to compress air along the air flow 115. The volute member 172 may be fixed to one end of the motor section 170 of the housing assembly 101. Accordingly, the volute member 172 and the end of the motor section 170 may cooperate to house the compressor wheel 104 and the first end 154 of the shaft 103.

[0033] As Figure 3 shown, the electrical module section 168 may be fixed to the opposite end of the motor section 170. The electrical module section 168 may include a housing 174 and an end cap 176. The housing 174 may be cylindrical and hollow, having a first end 178 and a second end 180. The first end 178 may be fixed to the motor section 170. The end cap 176 may be disc-shaped and may be fixed to the second end 180 of the housing 174 to enclose the second end 180. Accordingly, the housing 174, the end cap 176, and the end of the motor section 170 may cooperate to generally encapsulate the electrical module 164.

[0034] The motor section 170 of the housing assembly 101 may include a housing member 182, a first member 184, a second member 186, and a third member 188. In some embodiments, the housing member 182 may cooperate with the volute member 172 and the electrical module section 168 to define the exterior of the electric supercharger 100. Moreover, in some embodiments, the first member 184 may be referred to as a "stator housing" as it generally surrounds the stator 162. Additionally, the second member 186 and the third member 188 may be referred to as "support plates" or "end caps". In some embodiments, the first member 184, the second member 186, and the third member 188 may cooperate to generally encapsulate the rotor 160 and the stator 162.

[0035] In some embodiments, the housing member 182 can be generally cylindrical and can be hollow, thereby circumferentially surrounding the axis 105. The housing member 182 can include a first end 190 and a second end 192. The first end 190 can be fixed to the volute member 172. For example, as Figure 3 shown, the volute member 172 can radially overlap the outer diameter surface of the first end 190 of the housing member 182. The second end 192 of the housing member 182 can be fixed to the electrical module section 168. For example, the housing 174 of the electrical module section 168 can radially overlap the outer diameter surface of the second end 192 of the housing member 182.

[0036] The first member 184 of the housing assembly 101 can also be generally cylindrical and can be hollow. Accordingly, the first member 184 can circumferentially surround the axis 105 and can longitudinally extend along the axis 105. The first member 184 can include a first end 194, a second end 196, and an intermediate portion 198 extending along the axis 105 between the first and second ends 194, 196.

[0037] As Figure 3 and Figure 4 shown, the first end 194 of the first member 184 can be an annular flange that projects in the longitudinal direction along the axis 105 from the front facade 200 of the intermediate portion 198. The first end 194 can include an inner diameter surface 202 facing radially inward and an outer diameter surface 204 facing radially outward.

[0038] As Figure 3 shown, the second end 196 of the first member 184 can be an annular flange that projects from the rear facade 206 of the intermediate portion 198. The second end 196 can include an inner diameter surface 208 facing radially inward and an outer diameter surface 210 facing radially outward.

[0039] The second member 186 of the housing assembly 101 can be generally disc-shaped. As Figure 3 shown, the second member 186 can include a central opening 212 that is generally centered on the axis 105. The second member 186 can also include an outer surface 214 facing the compressor wheel 128 and an inner surface 216 facing the electric motor 108. In addition, as Figure 3 and Figure 4As shown, the second member 186 may include a first outer portion 218 that supports against the volute member 172 and the housing member 182. In some embodiments, the housing assembly 101 may further include a ring 213 disposed between the first outer portion 218 and the housing member 182. The second member 186 may further include a second outer portion 220 that is disposed adjacent to the first end 194 of the first member 184 of the housing assembly 101 and the front facade 200 of the first member 184 of the housing assembly 101. In some embodiments, the second outer portion 220 may be radially overlapped and received within the open first end 194 of the first member 184 of the housing assembly 101. Thus, the second member 186 may allow the first end 154 of the shaft 103 to pass through the motor section 170 to the compressor section 166 of the housing assembly 101. The second member 186 may further support the shaft 103 for rotation within the housing assembly 101, as will be discussed in detail below. Additionally, the second member 186 may serve as a barrier between the compressor wheel 104 and the electric motor 108.

[0040] The third member 188 of the housing assembly 101 may be generally disc-shaped. The third member 188 may include a central opening 222 that is generally centered about the axis 105. The third member 188 may further include an outer face 224 facing the electrical module 164 and an inner face 226 facing the electric motor 108. Additionally, the third member 188 may include a first outer portion 228 that supports against the housing member 182. In some embodiments, the housing assembly may further include a ring 229 disposed between the first outer portion 228 and the housing member 182. Further, the third member 188 may include a second outer portion 230 that is disposed adjacent to the second end 196 of the first member 184 of the housing assembly 101. In some embodiments, the second outer portion 230 may be radially overlapped and received within the open second end 196 of the first member 184 of the housing assembly 101. The third member 188 may further support the shaft 103 for rotation within the housing assembly 101, as will be discussed in detail below. Additionally, the third member 188 may serve as a barrier between the electric motor 108 and the electrical module 164.

[0041] As mentioned, the housing assembly 101 may support the shaft 103 and the rotor 160 for rotation about the axis 105. For example, as Figure 3As shown, the electric supercharger 100 may include a first bearing 232 and a second bearing 234. The first bearing 232 may be disposed in a central opening 212 of the second member 186 and may include an outer race fixed to the second member 186, an inner race fixed to an intermediate section 157 of the shaft 103, and a plurality of ball bearings disposed between the inner race and the outer race. The second bearing 234 may be similar, except that it may be disposed in a central opening 222 of the third member 188, with its outer race fixed to the third member 188 and its inner race fixed to the intermediate section 157 of the shaft 103.

[0042] In some embodiments, the first bearing 232 and / or the second bearing 234 may be grease-packed ball bearings. In some embodiments, these bearings may be cost-effective. Moreover, these types of bearings can be packaged in a relatively compact space within the electric supercharger.

[0043] In addition, the electric supercharger 100 may include at least one coolant flow path therethrough. For example, as Figure 3 shown, the electric supercharger 100 may include a port 236, a front groove 238, and a rear groove 240. The port 236 may extend through the housing member 182 and allow coolant to flow into or out of the electric supercharger 100. The front groove 238 may extend radially into the second member 186, separating the first and second outer portions 218, 220 of the second member 186. The rear groove 240 may extend radially into the third member 188, separating the first and second outer portions 228, 230. Thus, coolant may flow between the port 236, the front groove 238, and the rear groove 240 to provide a cooling effect for the electric supercharger 100.

[0044] Additionally, the electric supercharger 100 may include a plurality of seals, such as an O-ring 242. The O-ring 242 may be conventional and may be disposed between different members of the housing assembly 101 to prevent coolant leakage, prevent foreign object intrusion, and / or otherwise provide a seal between different members of the electric supercharger 100.

[0045] As Figure 2 、 Figure 3 and Figure 4 shown, the electric supercharger 100 may further include a damping system 250. In some embodiments, the damping system 250 may include a first damper 252 and a second damper 254. The first damper 252 and the second damper 254 may be generally similar to each other, except as noted below.

[0046] The first damper 252 may be generally annular. As Figure 5As shown, the first damper 252 can be an integral (i.e., one-piece) member that extends annularly and continuously about the axis of rotation 105. As Figure 2 and Figure 4 As shown, the first damper 252 can include a radially inner surface 256 and a radially outer surface 258. The first damper 252 can also include an outer edge 260 and an inner edge 262.

[0047] In some embodiments, the radially inner surface 256 and / or the radially outer surface 258 can be non-planar. For example, in some embodiments, the radially inner surface 256 and the radially outer surface 258 can be wavy, uneven, and / or wrinkled. Thus, the radially inner surface 256 can have alternating peaks and valleys, as Figure 2 As shown. The radially outer surface 258 can similarly include alternating peaks and valleys. The peaks and valleys of the radially inner surface 256 can be opposite to the peaks and valleys of the radially outer surface 258. Moreover, in some embodiments, the thickness of the damper 252 (measured between the radially outer surface 256 and the radially inner surface 258) can be generally constant and continuous circumferentially along the axis 105.

[0048] In some embodiments, the first damper 252 can be made of a metallic material. Moreover, the first damper 252 can be elastic and flexible. Thus, the damper 252 can be elastically deformed (e.g., between the first neutral position and the second deformed position shown in the figures). In some embodiments, when the first damper 252 is subjected to sufficient force, the radially inner surface 256 and / or the radially outer surface 258 can be deformed. For example, when the first damper 252 is subjected to sufficient load, the wave portions, bulge portions, and / or the pleat portions can be elastically displaced.

[0049] The first damper 252 can be disposed between the first member 184 and the second member 186 of the housing assembly 101. More specifically, as Figure 5 As shown, a plurality of portions of the radially inner surface 256 of the first damper 252 can abut against the opposing outer diameter surfaces 288 of the second outer portion 220 of the second member 186. Moreover, a plurality of portions of the radially outer surface 258 can abut against the opposing inner diameter surfaces 202 of the first end 194 of the first member 184. Additionally, as Figure 4 As shown, the outer edge 260 can abut against the opposing shoulder 290 of the second outer portion 220. Additionally, the inner edge 262 can abut against the opposing front facade 200 of the first member 184 of the housing assembly 101.

[0050] Accordingly, the first damper 252 can provide damping for forces (e.g., vibrations and other forces) transmitted between the first member 184 and the second member 186 of the housing assembly 101. The first damper 252 can be elastically displaced to dampen and reduce these forces. Moreover, in some embodiments, the first damper 252 can provide damping for radially and / or axially directed forces with respect to the axis 105.

[0051] The second damper 254 can be generally similar to the first damper 252, except that the second damper 254 can be disposed between the first member 184 and the third member 188. In particular, as Figure 3 shown, the second damper 254 can radially abut against the second outer portion 230 of the third member 188 and the second end 196 of the first member 184. Moreover, the second damper 254 can axially abut against the first member 184 and the third member 188. Accordingly, the second damper 254 can provide damping for radial and / or axial forces transmitted between the first member 184 and the third member 188.

[0052] Accordingly, the damping system 250 of the present disclosure can reduce the radial and axial loads of the electric supercharger 100. The damping system 250 can also increase the operating life of the electric supercharger, for example because the loads on the bearings 232, 234 can be reduced. Moreover, because the loads are reduced, the bearings 232, 234 included in the electric supercharger 100 can be relatively cost-effective and compact bearings, such as grease-filled ball bearings. In addition, the dampers 252, 254 can compensate for any bearing misalignment. Moreover, the dampers 252, 254 can reduce the vibration of the stator 162. The temperature of the damping system 250 can be controlled, for example, by coolant flowing in the nearby coolant grooves 238, 240. In addition, the damping system 250 can allow the electric supercharger 100 to be more compact than conventional electric superchargers. In addition, the damping system 250 can provide improved manufacturing efficiency. For example, it would be relatively simple to assemble the dampers 252, 254 within the housing assembly 101. Accordingly, the electric supercharger 100 can be manufactured and assembled in an efficient manner.

[0053] Although at least one exemplary embodiment has been presented in the foregoing detailed description, it should be understood that there are many variations. It should also be understood that the exemplary embodiment or exemplary embodiments are merely examples and are not intended to limit in any way the scope, applicability, or construction of the present disclosure. Rather, the foregoing detailed description will provide those skilled in the art with a convenient roadmap for implementing the exemplary embodiments of the present disclosure. It should be understood that various changes can be made in the function and arrangement of the elements described in the exemplary embodiments without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. An electrically driven compressor assembly, comprising: a shaft; a compressor wheel supported on the shaft; an electric motor having a stator and a rotor, the electric motor configured to rotate the shaft and the compressor wheel; a housing assembly configured to accommodate at least a portion of the stator, the rotor, and the shaft, the housing assembly including a housing member, a first member, a second member, and a third member; and a damper disposed between the first member and the second member of the housing assembly, the damper configured to elastically deform to provide damping to a force transmitted between the first member and the second member of the housing assembly, wherein the first member includes a first end, a second end, and an intermediate portion extending along an axis between the first and second ends, the first end of the first member protruding longitudinally along the axis from a front face of the intermediate portion and the second end of the first member protruding longitudinally along the axis from a rear face of the intermediate portion, and the second member includes a first outer portion and a second outer portion, the first outer portion of the second member being supported against the housing member, and the second outer portion of the second member being disposed adjacent to the first end of the first member of the housing assembly and the front face of the first member of the housing assembly, the third member includes a first outer portion and a second outer portion, the first outer portion of the third member being supported against the housing member, and the second outer portion of the third member being disposed adjacent to the second end of the first member of the housing assembly and the rear face of the first member of the housing assembly, and wherein the first member, the second member, and the third member cooperate to encapsulate the rotor and the stator.

2. The compressor assembly according to claim 1, wherein, the damper is configured to elastically deform between a first position and a second position; wherein the damper includes a surface that is uneven in the first position; and wherein the surface is configured to deform as the damper moves between the first position and the second position.

3. The compressor assembly according to claim 2, wherein, the shaft is configured to rotate about a rotation axis; wherein the damper extends circumferentially about the rotation axis, wherein the damper includes a radially inner surface facing the rotation axis and a radially outer surface facing away from the rotation axis, and wherein at least one of the radially inner surface and the radially outer surface is uneven in the first position.

4. The compressor assembly according to claim 3, wherein, both the radially inner surface and the radially outer surface are uneven in the first position.

5. The compressor assembly according to claim 4, wherein, the damper has a thickness measured between the radially inner surface and the radially outer surface; and wherein the thickness of the damper is generally constant circumferentially.

6. The compressor assembly according to claim 3, wherein, At least one of the radially inner surface and the radially outer surface includes a plurality of alternating peaks and valleys at the first position.

7. The compressor assembly according to claim 1, wherein, the first member of the housing assembly includes a first surface; wherein, the second member of the housing assembly includes a second surface facing the first surface in an opposite manner; wherein, the damper abuts the first surface of the first member of the housing assembly; and wherein, the damper abuts the second surface of the second member of the housing assembly.

8. The compressor assembly according to claim 7, wherein, the shaft is configured to rotate about a rotation axis; wherein, the first surface generally faces a first radial direction relative to the rotation axis; wherein, the second surface generally faces a second radial direction relative to the rotation axis; and wherein, the first radial direction is opposite to the second radial direction.

9. The compressor assembly according to claim 8, wherein, the damper abuts the first face of the first member and abuts the second face of the second member; and wherein, the first face faces a first longitudinal direction relative to the rotation axis; and wherein, the second face faces a second longitudinal direction relative to the rotation axis.

10. The compressor assembly according to claim 1, wherein, the damper is an integral member that is annular and continuously extends around the rotation axis of the shaft.

11. The compressor assembly according to claim 1, further comprising a bearing that supports the shaft to rotate about the rotation axis relative to the second member of the housing assembly; wherein, the first member of the housing assembly extends in a circumferential direction around the rotation axis and extends in a longitudinal direction along the rotation axis so as to cover the rotor and the stator; wherein, the first member includes an open end; and wherein, the second member of the housing assembly covers the open end.

12. The compressor assembly according to claim 11, wherein, the bearing is a grease-filled ball bearing.

13. The compressor assembly according to claim 11, wherein, the second member is received within the open end of the first member.

14. The compressor assembly according to claim 1, wherein, the damper is a first damper; wherein, the shaft is supported by a first bearing for rotation on the second member; wherein, the shaft is supported by a second bearing for rotation on the third member; and further comprising a second damper disposed between the first member and the third member, the second damper being configured to elastically deform so as to provide damping to the force transmitted between the first member and the third member of the housing assembly.

15. A method of manufacturing an electrically driven compressor assembly, comprising: providing a housing member, a first member, a second member, and a third member of a housing assembly; supporting a shaft on the first member for rotation relative to the first member, and a compressor wheel is supported on the shaft; An electric motor is received within the housing assembly, between the first member and the second member, the electric motor being configured to rotate the shaft and the compressor wheel; and the first member and the second member are attached together with a damper therebetween, the damper being configured to elastically deform to provide damping to a force transmitted between the first member and the second member of the housing assembly, wherein the first member includes a first end, a second end, and an intermediate portion extending along an axis between the first and second ends, the first end of the first member protruding longitudinally along the axis from a front face of the intermediate portion and the second end of the first member protruding longitudinally along the axis from a rear face of the intermediate portion, and the second member includes a first outer portion and a second outer portion, the first outer portion of the second member being supported against the outer housing member, and the second outer portion of the second member being arranged adjacent to the first end of the first member of the housing assembly and the front face of the first member of the housing assembly, the third member includes a first outer portion and a second outer portion, the first outer portion of the third member being supported against the outer housing member, and the second outer portion of the third member being arranged adjacent to the second end of the first member of the housing assembly and the rear face of the first member of the housing assembly, and wherein the first member, the second member, and the third member cooperate to encapsulate the rotor and stator of the electric motor.

16. The method of claim 15, further comprising: bringing the damper into abutment against a first surface of the first member; and bringing the damper into abutment against a second surface of the second member, the second surface facing the first surface.

17. The method of claim 16, wherein, the shaft is configured to rotate about a rotational axis; wherein the first surface faces generally a first radial direction relative to the rotational axis; wherein the second surface faces generally a second radial direction relative to the rotational axis; and wherein the first radial direction is opposite to the second radial direction.

18. The method of claim 17, further comprising: bringing the damper into abutment against a first face of the first member; and bringing the damper into abutment against a second face of the second member; wherein the first face faces a first longitudinal direction relative to the rotational axis; and wherein the second face faces a second longitudinal direction relative to the rotational axis.

19. An electric supercharger, comprising: a shaft; a compressor wheel having a plurality of vanes, the compressor wheel being fixed to the shaft for rotation about an axis; an electric motor having a stator and a rotor, the rotor being fixed to the shaft, the stator receiving the rotor and a portion of the shaft, the electric motor being configured to rotate the shaft and the compressor wheel about the axis; A housing assembly having a compressor section and a motor section, the compressor section configured to receive the compressor wheel, the motor section configured to receive the stator and the rotor, the motor section including a housing member, a first member, a second member, and a third member, the shaft extending through the second and third members so as to be received in the compressor section and the motor section; A bearing attached to the second member of the housing assembly and attached to the shaft, the bearing supporting the shaft for rotation about the axis relative to the second member; And A damper disposed between the first and second members of the housing assembly, the damper configured to elastically deform to provide damping to a force transmitted between the first and second members of the housing assembly, wherein the first member includes a first end, a second end, and an intermediate portion extending along an axis between the first and second ends, the first end of the first member protruding longitudinally along the axis from a front face of the intermediate portion and the second end of the first member protruding longitudinally along the axis from a rear face of the intermediate portion, and the second member includes a first outer portion and a second outer portion, the first outer portion of the second member being supported against the housing member, and the second outer portion of the second member being disposed adjacent to the first end of the first member of the housing assembly and the front face of the first member of the housing assembly, the third member includes a first outer portion and a second outer portion, the first outer portion of the third member being supported against the housing member, and the second outer portion of the third member being disposed adjacent to the second end of the first member of the housing assembly and the rear face of the first member of the housing assembly, and wherein the first member, the second member, and the third member cooperate to encapsulate the rotor and the stator.

20. The electric supercharger according to claim 19, wherein, the bearing is a first bearing, and the damper is a first damper; further comprising a second bearing attached to the third member of the housing assembly and attached to the shaft, the bearing supporting the shaft for rotation about the axis relative to the third member; And further comprising a second damper disposed between the first and third members, the second damper configured to elastically deform to provide damping to a force transmitted between the first and third members of the housing assembly.

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