Rotor end plate for a permanent magnet electric machine, rotor assembly with end plate, electric machine with rotor end plate, and electric compressor with electric machine with end plate

Abstract

An end plate for a rotor assembly of a permanent magnet electric machine is provided. The end plate includes a base plate, a reinforcement portion, and a counterweight portion. The base plate has an outer periphery, an inner periphery, and a first portion and a second portion. The base plate has a central axis and defines a base plane that is perpendicular to the central axis. The reinforcement portion is coupled to the first portion of the base plate and extends in a direction parallel to the central axis. The reinforcement portion extends along the outer periphery of the base plate in the first portion. The counterweight portion is coupled to the inner periphery of the base plate and extends from the inner periphery of the base plate toward the central axis, and the counterweight portion lies in the base plane.

Description

Technical Field

[0001] This invention relates to permanent magnet motors, and more particularly to rotor assemblies of permanent magnet motors having a pair of end plates. Background Technology

[0002] Compressors have long been used in cooling systems. In particular, scroll compressors have been used in systems designed to provide cooling in specific areas, in which a rotating scroll rotates in a circular motion relative to a stationary scroll to compress refrigerant. For example, such scroll compressors have long been used in HVAC systems of motor vehicles (e.g., automobiles) to provide air conditioning. These compressors can also be used, conversely, in applications requiring heat pumps. Typically, these compressors are driven by rotational motion derived from the automobile engine.

[0003] With the advent of battery-powered vehicles, electric vehicles, and / or hybrid vehicles, which may sometimes be powered solely by batteries, the compressor must be driven or powered by the battery rather than the engine. This type of compressor can be called an electric compressor.

[0004] Electric compressors may include motors, such as brushless motors, to drive rotating scrolls or other compression devices. Such motors include rotors that operate or rotate at speeds below their inherent frequency and require counterweights to balance the moving parts of the compressor mechanism. The counterweights serve to reduce vibrations and stresses caused by imbalance. The counterweights may be attached to the rotor itself or to a shaft driven by the rotor.

[0005] The rotor of a brushless motor can be constructed from a stack of ferromagnetic sheets alternating with insulating layers. Permanent magnets can be inserted into slots formed in the stack. Typically, the stack is held together by nonferrous end plates secured by fastening pins extending axially through the end plates and the stack from one end to the other. Imbalance in the compressor mechanism depends on the overall geometry of the rotor assembly, including all components that rotate with the shaft, such as the rotating scroll.

[0006] While counterweights are necessary for balancing the moving parts of the compressor mechanism, they also take up valuable package space, especially in automotive vehicles where package space is very limited.

[0007] The present invention aims to solve one or more of the above-mentioned problems. Summary of the Invention

[0008] In a first aspect of the invention, an end plate for a rotor assembly of a permanent magnet motor is provided. The end plate includes a base plate, a reinforcing portion, and a counterweight portion. The base plate has an outer periphery, an inner periphery, a first portion, and a second portion. The base plate has a central axis and defines a base plane perpendicular to the central axis. The reinforcing portion is coupled to the first portion of the base plate and extends in a direction parallel to the central axis. The reinforcing portion extends along the outer periphery of the base plate in the first portion. The counterweight portion is coupled to the inner periphery of the base plate in the second portion and extends from the inner periphery of the base plate toward the central axis, and the counterweight portion lies within the base plane.

[0009] A second aspect of the invention provides a rotor assembly for a permanent magnet motor. The rotor assembly includes a rotor and a pair of end plates located at opposite axial ends of the rotor. Each end plate includes a base plate, a reinforcing portion, and a counterweight portion. The base plate has an outer periphery, an inner periphery, and a first portion and a second portion. The base plate has a central axis and defines a base plane perpendicular to the central axis. The reinforcing portion is coupled to the first portion of the base plate and extends in a direction parallel to the central axis. The reinforcing portion extends along the outer periphery of the base plate in the first portion. The counterweight portion is coupled to the inner periphery of the base plate in the second portion and extends from the inner periphery of the base plate toward the central axis, and the counterweight portion lies within the base plane.

[0010] In a third aspect of the invention, a permanent magnet motor is provided. The permanent magnet motor includes a housing, a rotor, a stator, and a pair of end plates. Each end plate includes a base plate, a reinforcing portion, and a counterweight portion. The base plate has an outer periphery, an inner periphery, and a first portion and a second portion. The base plate has a central axis and defines a base plane perpendicular to the central axis. The reinforcing portion is coupled to the first portion of the base plate and extends in a direction parallel to the central axis. The reinforcing portion extends along the outer periphery of the base plate in the first portion. The counterweight portion is coupled to the inner periphery of the base plate in the second portion and extends from the inner periphery of the base plate toward the central axis, and the counterweight portion lies within the base plane.

[0011] In a fourth aspect of the invention, an electric scroll compressor configured to compress a refrigerant is provided. The electric scroll compressor includes a housing, a refrigerant inlet port, a refrigerant outlet port, a permanent magnet motor, a drive shaft, and a compression device. The housing defines an inlet volume and a discharge volume. The refrigerant inlet port is coupled to the housing and configured to introduce refrigerant into the inlet volume. The refrigerant outlet port is coupled to the housing and configured to allow compressed refrigerant to exit the electric scroll compressor from the discharge volume. The permanent magnet motor is mounted inside the housing. The permanent magnet motor includes a rotor, a stator, and a pair of end plates located at opposite axial ends of the rotor. The rotor is rotatably coupled to the housing. The stator is fixedly coupled to the housing. Each end plate includes a base plate, a reinforcing portion, and a counterweight portion. The base plate has an outer periphery, an inner periphery, and a first portion and a second portion. The base plate has a central axis and defines a base plane perpendicular to the central axis. The reinforcing portion is coupled to the first portion of the base plate and extends in a direction parallel to the central axis. The reinforcing portion extends along the outer periphery of the base plate in the first portion. The counterweight portion is coupled to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located within the base plane. The drive shaft is coupled to the rotor. The compression device is coupled to the drive shaft and configured to receive refrigerant from the inlet volume and compress the refrigerant when the drive shaft is rotated by the motor.

[0012] theme 1. An end plate for a rotor assembly of a permanent magnet motor, comprising: A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; A reinforcing portion, which is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending along the outer periphery of the substrate in the first portion; and The counterweight portion is connected to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane.

[0013] 2. The end plate according to Subject 1, wherein the rotor assembly includes a rotor, wherein the first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

[0014] 3. The end plate according to Subject 2, wherein the second portion includes a flat surface for receiving a counterweight.

[0015] 4. The end plate according to Topic 3, wherein the reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion and the counterweight portion are formed from sheet material using a stamping process.

[0016] 5. The end plate according to Subject 3, wherein the first portion of the substrate has an angle range of less than 180 degrees.

[0017] 6. A rotor assembly for a permanent magnet motor, comprising: Rotor; A pair of end plates located at opposite axial ends of the rotor, each end plate comprising: • A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; • A reinforcing portion, which is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending in the first portion along the outer periphery of the substrate; • A counterweight portion, which is attached to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane.

[0018] 7. The rotor assembly according to Topic 6, wherein the first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

[0019] 8. The rotor assembly according to Topic 7, wherein each second portion includes a flat surface, and the rotor assembly further includes a pair of counterweights, each counterweight being mounted adjacent to the flat portion to a corresponding end plate.

[0020] 9. The rotor assembly according to Topic 8, wherein the reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion and the counterweight portion are formed from sheet material using a stamping process.

[0021] 10. The rotor assembly according to Topic 8, wherein the first portion of the substrate has an angular range of less than 180 degrees.

[0022] 11. A permanent magnet motor, comprising: case; A rotor, which is rotatably connected to the housing; The stator is fixedly connected to the housing; A pair of end plates located at opposite axial ends of the rotor, each end plate comprising: • A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; • A reinforcing portion, which is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending in the first portion along the outer periphery of the substrate; • A counterweight portion, which is attached to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane.

[0023] 12. The permanent magnet motor according to subject 11, wherein the first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

[0024] 13. The permanent magnet motor according to Subject 12, wherein each second portion includes a flat surface, and the permanent magnet motor includes a pair of counterweights, each counterweight being mounted adjacent to the flat portion to a corresponding end plate.

[0025] 14. The permanent magnet motor according to Topic 13, wherein the reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion and the counterweight portion are formed from sheet material using a stamping process.

[0026] 15. The permanent magnet motor according to Subject 13, wherein the first portion of the substrate has an angular range of less than 180 degrees.

[0027] 16. An electric scroll compressor configured to compress a refrigerant, comprising: The casing defines the inlet and outlet volumes; A refrigerant inlet port, which is connected to the housing and configured to introduce refrigerant into the inlet volume; A refrigerant outlet port, which is connected to the housing and configured to allow compressed refrigerant to exit the electric scroll compressor from the discharge volume; A permanent magnet motor, which is installed inside the housing, includes: • A rotor, which is rotatably connected to the housing; • Stator, which is fixedly connected to the housing; • A pair of end plates located at opposite axial ends of the rotor, each end plate comprising: • A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; • A reinforcing portion, which is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending along the outer periphery of the substrate in the first portion; • A counterweight portion, which is connected to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane; A drive shaft, which is connected to the rotor; and A compression device is coupled to the drive shaft and configured to receive refrigerant from the inlet volume and to compress the refrigerant as the drive shaft is rotated by the motor.

[0028] 17. The electric scroll compressor according to subject 16, wherein the first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

[0029] 18. The electric scroll compressor according to Subject 17, wherein each second portion includes a flat surface, and the permanent magnet motor includes a pair of counterweights, each counterweight being mounted adjacent to the flat portion to a corresponding end plate.

[0030] 19. The electric scroll compressor according to Topic 18, wherein the reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion and the counterweight portion are formed from sheet material using a stamping process.

[0031] 20. The electric scroll compressor according to Subject 18, wherein the first portion of the substrate has an angular range of less than 180 degrees. Attached Figure Description

[0032] These and other features and advantages of the invention will become more readily apparent when considered in conjunction with the following detailed description and accompanying drawings.

[0033] Figure 1 This is a cross-sectional view of an electric compressor according to an embodiment of the present invention.

[0034] Figure 2 This is a perspective view of a rotor assembly of a permanent magnet motor including a pair of end plates according to an embodiment of the present invention.

[0035] Figure 3 yes Figure 2 An exploded view of the rotor assembly.

[0036] Figure 4A It is a pair of counterweights according to an embodiment of the present invention and Figure 2 A perspective view of a pair of end plates.

[0037] Figure 4B yes Figure 2 and Figure 4A A second perspective view of a pair of end plates and a pair of counterweights.

[0038] Figure 5A yes Figure 2 A perspective view of one of the end plates.

[0039] Figure 5B yes Figure 5A A second perspective view of an end plate.

[0040] Figure 6A yes Figure 2 Another perspective view of the end plate.

[0041] Figure 6B yes Figure 6A A second perspective view of the other end plate.

[0042] Figure 7 yes Figure 2 A front view of one of the end plates. Detailed Implementation

[0043] Referring to the accompanying drawings, in operation, the present invention relates to a permanent magnet motor 54, which can be used in an electric compressor 10, such as an electric scroll compressor.

[0044] Special Reference Figure 1 The electric compressor 10 has a housing 12. The electric compressor 10 is particularly suitable for motor vehicles, such as automobiles (not shown). The electric compressor 10 can be used as a cooling device or a heat pump to heat and / or cool different aspects of the vehicle. For example, the electric compressor 10 can be used as part of a heating, ventilation, and air conditioning (HVAC) system in an electric vehicle (not shown) to cool or heat the passenger compartment. Furthermore, the electric compressor 10 can be used to heat or cool the passenger compartment, onboard electronics, and / or the battery that powers the vehicle when the vehicle is not in operation (e.g., during a charging cycle). The electric compressor 10 can also be used when the vehicle is not in operation and the battery is not being charged to maintain battery life or minimize battery degradation.

[0045] In the illustrated embodiment, the electric compressor 10 is a scroll compressor, which is used to rapidly and efficiently compress refrigerant for use in various systems of a motor vehicle (e.g., an electric vehicle or a hybrid vehicle). See details. Figure 1The electric compressor 10 includes an inverter section 14, a motor section 16, and a compression unit (or compression assembly) 18 housed within a housing 12. The housing 12 includes an inverter rear cover 20, an inverter housing 22, a central housing 24 (which may be integral), and a rear head 28 (which may be referred to as a discharge head). The central housing 24 houses the motor section 16 and the compression unit 18.

[0046] In one embodiment, the inverter rear cover 20, inverter housing 22, center housing 24, and rear head 28 are made of machined aluminum. The inverter 10 can be mounted, for example, within the body of a motor vehicle via multiple mounting points (not shown).

[0047] In the illustrated embodiment, the inverter rear cover 20 and the inverter housing 22 form the inverter cavity 30. The inverter rear cover 20 is mounted to the inverter housing 22 by a plurality of bolts 32. An inverter gasket 42 is disposed between the inverter rear cover 20 and the inverter housing 22 to prevent moisture, dust and other contaminants from entering the inverter cavity 30.

[0048] Inverter module 72 is mounted within inverter cavity 30, formed by inverter rear cover 20 and inverter housing 22. Inverter module 72 may include inverter circuitry (not shown) mounted on a printed circuit board (not shown), which is mounted to inverter housing 22. The inverter circuitry converts direct current (DC) power received from outside the electric compressor 10 into three-phase alternating current (AC) power to supply power to motor 54 (see below). The inverter circuitry may also control the speed of electric compressor 10. High-voltage DC current is supplied to the inverter circuitry via a high-voltage connector (not shown). Low-voltage DC current for driving the inverter circuitry, and control signals for controlling the operation of the inverter circuitry and motor section 16, may be supplied via a low-voltage connector (not shown).

[0049] The central housing 24 forms the motor cavity 56. The motor section 16 includes a motor 54 located within the motor cavity 56. In one embodiment, the motor 54 is a three-phase AC motor with a stator 58. The stator 58 is generally hollow cylindrical and has six independent coils (two per phase). The stator 58 is housed within and mounted to the motor housing 22 and remains stationary relative to the motor housing 22.

[0050] The motor 54 includes a rotor 60 located within and centered relative to the stator 58. The rotor 60 is generally hollow cylindrical and located within the stator 58.

[0051] A drive shaft 70 is coupled to and rotates with a rotor 60. In the illustrated embodiment, the drive shaft 70 is press-fitted within a central bore 60A of the rotor 60. The drive shaft 70 has a first end 70A and a second end 70B. The inverter housing 22 includes a first drive shaft support member 22A located on the motor side of the inverter housing 22. A first ball bearing 62 located within a bore formed by the first drive shaft support member 22A supports and allows rotation of the first end of the drive shaft 70. The central housing 24 includes a second drive shaft support member 24A. A second ball bearing 64 located within a bore formed by the second drive shaft support member 24A allows rotation of the second end 70B of the drive shaft 70. In the illustrated embodiment, the first ball bearing 62 and the second ball bearing 64 are press-fitted with bores formed by the first drive shaft support member 22A of the inverter housing 22 and the second drive shaft support member 24A of the central housing 24, respectively.

[0052] As described above, the electric compressor 10 is a scroll compressor. The compression device 18 includes a fixed scroll 26 and a rotating scroll 66. The rotating scroll 66 is fixed to the second end 70B of the drive shaft 70. Under the control of the inverter module 72, the rotor 60 with the drive shaft 70 rotates to drive the rotating scroll 66 to move.

[0053] The drive shaft 70 has a central axis 70C, around which the rotor 60 and the drive shaft 70 rotate. A rotating scroll member 66 moves along an eccentric track around the central axis 70C, that is, it performs circular motion while maintaining a constant orientation relative to the fixed scroll member 26. The center of the rotating scroll member 66 is positioned along an offset axis (not shown) of the drive shaft 70.

[0054] Typically, the mixed refrigerant and oil (at low pressure) enter the electric compressor 10 through the refrigerant inlet port 34 and exit the electric compressor 10 (at high pressure) through the refrigerant outlet port 36 after being compressed by the compression unit 18. The refrigerant travels along the refrigerant path through the electric compressor 10. The refrigerant enters the refrigerant inlet port and enters the inlet volume 74 formed between the motor side of the inverter housing 22 and the central housing 24 adjacent to the refrigerant inlet port. Then, the refrigerant is drawn through the motor section 16 and enters the compression inlet volume formed between the inner wall of the stationary scroll member 26 and the rotating scroll member 66.

[0055] A fixed scroll member 26 is mounted within the central housing 24. Refrigerant enters the compression unit 18 from the compression inlet volume. The fixed scroll member 26 and the rotating scroll member 66 form a compression chamber 40, into which low-pressure or unpressurized (saturated pressure) refrigerant enters from the compression unit 18. As the rotating scroll member 66 moves, the compression chamber 40 is closed, reducing its volume to pressurize the refrigerant. At any given time during the cycle, one or more compression chambers 40 are in different stages of the compression cycle. During the cycle of the compressor 10, the refrigerant is directed towards the center of the compression chambers 40.

[0056] return Figure 1 The rear head 28 forms a discharge volume 44. The discharge volume 44 is connected to the refrigerant output port 36. The pressurized refrigerant leaves the compressor unit 18 through one or more orifices 48. The release of the pressurized refrigerant is controlled by a reed mechanism 68.

[0057] refer to Figure 2 , Figure 3 , Figures 4A-4B , Figures 5A-5B , Figures 6A-6B and Figure 7 This illustration shows a permanent magnet motor 54 suitable for an electric compressor 10 according to an embodiment of the present invention. A housing 12 or a component thereof may be used as the housing 12 of the permanent magnet motor 54. As described above, the motor 54 includes a stator 58 and a rotor 60.

[0058] The rotor 60 may include a stack of ferromagnetic sheets alternating with insulating layers (not shown). Permanent magnets may be inserted into slots formed in the rotor 60. As discussed in more detail below, a pair of end plates 76 may be positioned at opposite ends of the rotor 60. The rotor 60 and the end plates 76 (which may be referred to as rotor assembly 106) may be held together by a plurality of fasteners 96, such as rivets.

[0059] The rotor 60 is rotatably connected to the housing 12. As described above, the rotor 60 can be supported by a first ball bearing 62 and a second ball bearing 64. The stator 58 is fixedly connected to the housing 12.

[0060] End plates 76 are located at the axial ends of rotor 60. As shown, each end plate 76 includes a base plate 78, a reinforcing portion 80, and a counterweight portion 82. Figure 7 As most clearly shown, substrate 78 has an outer periphery 84, an inner periphery 86, and a first portion 88 and a second portion 90. Each end plate 76 (and associated substrate 78) has a central axis 100, which is aligned with each other and with a central axis 70C during assembly (see [link to documentation]). Figure 2 , Figure 3 , Figures 4A-4B , Figures 5A-5B and Figures 6A-6B ).return Figure 7 The substrate 78 defines a base plane 98 or is located within the base plane 98, which is perpendicular to the central axis 100.

[0061] The reinforcing portion 80 is attached to the first portion 88 of the substrate 78 and extends in a direction parallel to the central axis 100. As shown, the reinforcing portion 80 may extend radially along the outer periphery 84 of the substrate 78 in the first portion 88. The reinforcing portion 80 provides resistance to bending forces applied by the fastener 96 and increases the clamping force applied to the laminate of the rotor 60.

[0062] In the illustrated embodiment, the first portion 88 and the reinforcing portion 80 extending from the first portion 88 have an angular range of α (see [reference]). Figure 7 In one embodiment, α is less than 180 degrees.

[0063] The substrate 78 may also include a counterweight portion 82, which is coupled to the inner periphery 86 of the substrate 78 in the second portion 90 and extends from the inner periphery 86 of the substrate 78 toward the central axis 100. In the illustrated embodiment, the counterweight portion 82 is located within the base plane 100. The counterweight portion 82 represents adding mass to the rotor assembly 106 to help balance the motor 54 (without increasing the external dimensions of the rotor assembly 106).

[0064] As shown in the figure, the first portion 88 and the second portion 90 include at least one hole 92 configured to receive a corresponding fastener 96 for mounting the end plate 76 to the rotor 60. In one aspect of the invention, the end plate 76 of the present invention allows for the use of a reduced number of fasteners 96, for example, four, in the assembly of the rotor 60.

[0065] refer to Figure 2 , Figure 3 and Figures 4A-4B Each second portion 90 includes a flat surface 94. The flat surface 94 is configured to receive a corresponding counterweight 102. As shown, each counterweight 102 can be mounted adjacent to the flat portion 94 to a corresponding end plate 76. In the illustrated embodiment, each counterweight has one or more holes 104 configured to receive a corresponding fastener 96.

[0066] In another aspect of the invention, the reinforcing portion 80 and the counterweight portion 82 are integral with the substrate 78. The substrate 78, the reinforcing portion 80, and the counterweight portion 82 can be formed from a sheet using a stamping process. The sheet is a non-ferrous material, such as aluminum.

[0067] After the motor 54 is assembled, the fastener 96 is located in the corresponding holes 92 and 104 in the counterweight 102 and end plate 76 on the opposite side of the rotor 60. As shown in the figure, the end plate 76 at one end of the rotor 60 can rotate 180 degrees relative to the end plate 76 on the opposite side of the rotor 60.

[0068] The foregoing invention has been described in accordance with applicable legal standards, and therefore this description is exemplary rather than restrictive in nature. Variations and modifications to the disclosed embodiments will be apparent to those skilled in the art and fall within the scope of this invention.

Claims

1. An end plate for a rotor assembly of a permanent magnet motor, comprising: A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; A reinforcing portion is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending along the outer periphery of the substrate in the first portion; as well as The counterweight portion is connected to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane.

2. The end plate of claim 1, wherein, The rotor assembly includes a rotor, wherein the first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

3. The end plate according to claim 2, wherein, The second part includes a flat surface for receiving the counterweight.

4. The end plate according to claim 3, wherein, The reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion, and the counterweight portion are formed from sheet material using a stamping process.

5. The end plate according to claim 3, wherein, The first portion of the substrate has an angle range of less than 180 degrees.

6. A rotor assembly for a permanent magnet motor, comprising: Rotor; A pair of end plates located at opposite axial ends of the rotor, each end plate comprising: • A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; • A reinforcing portion, which is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending in the first portion along the outer periphery of the substrate; • A counterweight portion, which is attached to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane.

7. The rotor assembly according to claim 6, wherein, The first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

8. The rotor assembly according to claim 7, wherein, Each second section includes a flat surface, and the rotor assembly also includes a pair of counterweights, each counterweight being mounted adjacent to the flat section to the corresponding end plate.

9. The rotor assembly according to claim 8, wherein, The reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion, and the counterweight portion are formed from sheet material using a stamping process.

10. The rotor assembly according to claim 8, wherein, The first portion of the substrate has an angle range of less than 180 degrees.

11. A permanent magnet motor, comprising: case; A rotor, which is rotatably connected to the housing; The stator is fixedly connected to the housing; A pair of end plates located at opposite axial ends of the rotor, each end plate comprising: • A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; • A reinforcing portion, which is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending in the first portion along the outer periphery of the substrate; • A counterweight portion, which is attached to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane.

12. The permanent magnet motor according to claim 11, wherein, The first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

13. The permanent magnet motor according to claim 12, wherein, Each second section includes a flat surface, and the permanent magnet motor includes a pair of counterweights, each counterweight being mounted adjacent to the flat section to a corresponding end plate.

14. The permanent magnet motor according to claim 13, wherein, The reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion, and the counterweight portion are formed from sheet material using a stamping process.

15. The permanent magnet motor according to claim 13, wherein, The first portion of the substrate has an angle range of less than 180 degrees.

16. An electric scroll compressor configured to compress a refrigerant, comprising: The casing defines the inlet and outlet volumes; A refrigerant inlet port, which is connected to the housing and configured to introduce refrigerant into the inlet volume; A refrigerant outlet port, which is connected to the housing and configured to allow compressed refrigerant to exit the electric scroll compressor from the discharge volume; A permanent magnet motor, which is installed inside the housing, includes: • A rotor, which is rotatably connected to the housing; • Stator, which is fixedly connected to the housing; • A pair of end plates located at opposite axial ends of the rotor, each end plate comprising: • A substrate having an outer periphery, an inner periphery, a first portion, and a second portion, the substrate having a central axis and defining a base plane perpendicular to the central axis; • A reinforcing portion, which is connected to a first portion of the substrate and extends in a direction parallel to the central axis, the reinforcing portion extending along the outer periphery of the substrate in the first portion; • A counterweight portion, which is connected to the inner periphery of the substrate in the second portion and extends from the inner periphery of the substrate toward the central axis, and the counterweight portion is located in the base plane; A drive shaft, which is connected to the rotor; and A compression device is coupled to the drive shaft and configured to receive refrigerant from the inlet volume and to compress the refrigerant as the drive shaft is rotated by the motor.

17. The electric scroll compressor according to claim 16, wherein, The first portion and the second portion include at least one hole configured to receive fasteners for mounting the end plate to the rotor.

18. The electric scroll compressor according to claim 17, wherein, Each second section includes a flat surface, and the permanent magnet motor includes a pair of counterweights, each counterweight being mounted adjacent to the flat section to a corresponding end plate.

19. The electric scroll compressor according to claim 18, wherein, The reinforcing portion and the counterweight portion are integral with the substrate, wherein the substrate, the reinforcing portion, and the counterweight portion are formed from sheet material using a stamping process.

20. The electric scroll compressor according to claim 18, wherein, The first portion of the substrate has an angle range of less than 180 degrees.

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