A maintenance-friendly three-phase asynchronous motor

Abstract

The application belongs to the technical field of three-phase asynchronous motors, and particularly relates to an easy-to-maintain three-phase asynchronous motor, which comprises a motor and a base assembly, the motor is used for converting electric energy into mechanical energy, and the base assembly is used for fixing the motor. The end cover assembly in the application can realize quick mounting connection and dismounting with the shell, effectively improve the mounting connection efficiency and dismounting and maintenance efficiency, and has the advantage of preventing loosening caused by vibration after mounting, effectively avoids loosening of the end cover in the traditional motor caused by vibration in the long-time use process because the end cover is connected with the shell through simple bolts, has higher safety and stability, and is beneficial to long-time stable and safe operation of the motor.

Description

Technical Field

[0001] This invention belongs to the field of three-phase asynchronous motor technology, and particularly relates to an easy-to-maintain three-phase asynchronous motor. Background Technology

[0002] Three-phase asynchronous motors, also known as induction motors, are electric motors powered by a 380V three-phase AC power supply. Because the rotor and stator rotating magnetic fields rotate in the same direction but at different speeds, they exhibit slip, hence the name "asynchronous" motor. They are the most widely used electric motors in industrial and agricultural production, accounting for approximately 85% of the total power load on the power grid.

[0003] Most existing three-phase asynchronous motors connect the housing and end cover with bolts. This connection involves a large number of bolts, making disassembly and assembly cumbersome and hindering rapid installation and maintenance. A bearing connects the end cover and the shaft. Disassembly and maintenance require separating the end cover from the shaft. Since the bearing is interference-fitted with both the end cover and shaft, disassembly is laborious and can easily damage the shaft, end cover, and bearing. Furthermore, reinstalling the end cover onto the shaft after maintenance is also difficult, resulting in low efficiency for motor disassembly and maintenance.

[0004] In existing three-phase asynchronous motors, the bearings used to connect the end cover and the shaft often experience dry friction due to insufficient grease after prolonged use. This leads to bearing damage, affecting the smooth rotation of the shaft and increasing the motor's energy consumption. Even with timely application of grease, it is impossible to ensure complete grease penetration, resulting in poor lubrication and maintenance.

[0005] In addition, the existing three-phase asynchronous motors are installed and fixed on the base with multiple bolts, which makes the installation, disassembly, relocation, and maintenance of them inefficient. How to achieve rapid installation, fixing, and disassembly of the motor to improve installation and maintenance efficiency is a problem worth studying and solving.

[0006] This invention designs an easy-to-maintain three-phase asynchronous motor to solve the above problems. Summary of the Invention

[0007] Therefore, it is necessary to address the existing problems of current three-phase asynchronous motors by providing an easy-to-maintain three-phase asynchronous motor. This motor utilizes an end cover assembly to achieve quick installation and disassembly of the housing, effectively improving installation and disassembly / repair efficiency. The end cover assembly also prevents loosening due to vibration after installation, effectively avoiding the loosening that occurs in traditional motors where the end cover is simply bolted to the housing, leading to vibration-induced loosening during prolonged use. This provides higher safety and stability, contributing to the long-term stable and safe operation of the motor. The connecting seat assembly allows for quick and efficient disassembly and separation of the end cover assembly from the shaft, improving disassembly efficiency and preventing damage to the shaft and bearings caused by interference fits during disassembly, further enhancing motor disassembly and repair efficiency. Finally, a bearing assembly connects the end cover assembly to the shaft. The bearing assembly automatically replenishes lubricating grease through the significant movement of the balls due to grease deficiency, preventing dry friction damage to the balls when grease is insufficient or ineffective, thus extending bearing life and effectively reducing motor maintenance costs. The base assembly enables quick installation, fixation, and disassembly of the motor on the ground, effectively improving the efficiency of motor installation and disassembly. At the same time, the base assembly can automatically tighten any loose connections between the base assembly and the ground during prolonged motor vibration, thereby effectively preventing the motor from loosening due to vibration and avoiding cumulative vibration damage caused by a loose base during operation.

[0008] The above objectives are achieved through the following technical solutions: An easy-to-maintain three-phase asynchronous motor for converting electrical energy into mechanical energy includes: An electric motor is used to convert electrical energy into mechanical energy. The motor includes a housing, a stator disposed within the housing, a rotor disposed within the stator via a rotating shaft, and two end cover assemblies disposed at both ends of the housing. Each end cover assembly includes a round cover. The round cover is provided with a first locking structure that enables a three-point initial axial connection and radial locking between the two components simply by axial fastening. The round cover is also provided with a drive structure that further enables synchronous axial locking of the round cover and the housing through the three-point initial axial connection. The first locking structure enables quick disassembly of the end cover assembly and the housing. A detachable connecting seat assembly is disposed in a first round hole in the center of the round cover. The connecting seat assembly is connected to the rotating shaft via a bearing assembly. When the balls inside the bearing assembly shift due to grease failure, the bearing assembly can automatically replenish the grease to the balls.

[0009] A base assembly for fixing a motor includes a first base plate connected to the housing via four legs and a second base plate horizontally fixed to the ground. The four corners of the second base plate are provided with positioning posts that mate with positioning holes on the first base plate. The first base plate is provided with a second locking structure that can be locked or disengaged from the four positioning posts by only a small angle adjustment and automatically prevents the first base plate from loosening due to vibration.

[0010] In one embodiment, the first locking structure includes a first edge ring disposed on the edge of the round cover. The first edge ring has three second round holes spaced 120 degrees circumferentially. A first rotating sleeve is rotatably disposed within each of the second round holes. A connecting screw, which mates with a threaded groove on the end face of the housing, is slidably disposed within the first rotating sleeve. The connecting screw has a guide key that mates with a keyway on the inner wall of the first rotating sleeve. A limiting post is disposed at the outer end of the connecting screw, which mates with a third annular groove on the inner wall of the end of each of the second round holes. A second end block is disposed at the end of the limiting post. A second spring connects the second end block to the first rotating sleeve. The first rotating sleeve is provided with a third gear, which meshes with a fourth gear provided in the transmission groove of the first side ring. The fourth gear is provided on the second rotating sleeve in the transmission groove through a first one-way ring. The second rotating sleeve is provided with a fifth gear, which engages with an incomplete gear provided in the swing groove of the first side ring through a first fixing pin. The incomplete gear is coaxially connected to the third rotating sleeve. The third rotating sleeve is provided with a second lever and a hook that engages with the outer side of the corresponding end of the housing. A spiral spring is connected between the third rotating sleeve and the first fixing pin. The second lever engages with a push rod that slides radially in the sliding groove of the housing.

[0011] In one embodiment, the drive structure includes a sixth gear disposed on a first rotating sleeve, the sixth gear meshing with a second gear ring rotatably disposed in a second annular groove on the outer side of the round cover, the second gear ring meshing with a seventh gear disposed on the round cover, the seventh gear meshing with an eighth gear disposed on the round cover, and the eighth gear being provided with a crank handle.

[0012] In one embodiment, the outer end of the push rod is provided with a first end block, and a first spring is connected between the first end block and the housing. The push rod meshes with a first gear that is disposed on the housing via a first pivot pin. A second gear is disposed on the first pivot pin. The second gear meshes with a first gear ring that is rotatably disposed in a first annular groove on the outer side of the housing. A first lever is disposed on the first gear ring.

[0013] In one embodiment, the connecting seat assembly includes a first ring sleeve that mates with a first circular hole. A first ring plate that mates with the inner side of a circular cover is provided on the outer side of one end of the first ring sleeve. A positioning pin that mates with a positioning groove on the inner side of the circular cover is provided on the first ring plate. A locking nut that mates with the outer side of the circular cover is threaded onto the first ring sleeve. A bearing chamber that mates with a bearing assembly is provided on the inner side of the first ring sleeve.

[0014] In one embodiment, the bearing assembly includes an inner ring that mates with a shaft step and an outer ring that mates with a bearing housing fitted onto a first ring. A first rolling groove and a second rolling groove are respectively formed on the outer cylindrical surface of the inner ring and the inner cylindrical surface of the outer ring. A plurality of balls are rolled around the axis of the inner ring in the first and second rolling grooves. Two second side rings are symmetrically arranged on the inner sides of both ends of the outer ring. An annular grease reservoir is formed within each second side ring. A fourth annular groove communicating with the corresponding grease reservoir is formed on the inner end side of each second side ring. The grease reservoir is located along the axial direction of the outer ring. A second ring plate and a slip ring are slidably arranged. The slip ring is rotatably connected to a third ring plate, which is located between the third ring plate and the second ring plate. A third lever and two round rods spaced 180 degrees circumferentially on the end face of the third ring plate are provided. The round rods and the third lever move within the first and second movable grooves on the outer end face of the second ring, respectively. A grease supply tube for replenishing grease into the space between the second ring plate and the slip ring is provided on the end face of the slip ring. The end of the grease supply tube is threaded with a sealing cap. The grease supply tube moves on the fourth... Within the movable groove and the second guide hole on the outer end face of the second side ring, a second ring sleeve, connected to the corresponding second ring plate, slides axially along the outer ring within the fourth ring groove. An annular grease-filling cavity is formed within the second ring sleeve, communicating with circumferentially evenly distributed connecting grooves on the second ring plate. Several hemispherical grooves, corresponding one-to-one with the ball bearings and communicating with the grease-filling cavity, are formed on the end face of the second ring sleeve. Two racks, spaced 180 degrees circumferentially apart, are provided on the end face of the second ring plate. The racks move through the third guide hole on the slip ring and the third movable groove on the third ring plate. Inside the first guide hole on the outer end face of the second side ring, a tension spring plate is provided at the end of the rack. A third spring is connected between the tension spring plate and the outer end face of the second side ring. An arc tooth is provided on the round rod. The arc tooth meshes with a ninth gear that is set on the outer end face of the second side ring through a second pivot pin. A tenth gear that meshes with the rack is provided on the second pivot pin through a second one-way ring. The ninth gear meshes with an eleventh gear. The eleventh gear is set on a second fixed pin through a third one-way ring. The second fixed pin is set on the outer end face of the second side ring.

[0015] In one embodiment, the third lever is provided with a sliding sleeve, and the sliding sleeve is provided with a guide rod. The guide rod slides around the central axis of the outer ring within the guide sleeve on the outer end face of the second side ring. The end of the guide rod is provided with a third end block, and a fourth spring is connected between the third end block and the guide sleeve to make the arc teeth mesh with the ninth gear.

[0016] In one embodiment, heat sinks are evenly distributed on the outer side of the housing, and a cooling fan for dissipating heat from the heat sinks is provided on the rotating shaft. The two round covers are respectively threaded with a fan cover for protecting the cooling fan and a protective cover for shielding the first locking structure and the driving structure.

[0017] In one embodiment, the second locking structure includes guide grooves that are parallel to each other and are provided on the upper surface of the first base plate. Each guide groove corresponds to two positioning holes. A crank wheel is provided in the middle of the guide groove. Two connecting rods are hinged to the crank wheel and are distributed at 180-degree intervals in the circumference, corresponding one-to-one with the two positioning holes. A slider is hinged to the movable end of the connecting rod. The slider slides in the corresponding guide groove. A first inclined surface is provided on the slider, which communicates with its end face and cooperates with the second inclined surface on the lower side of the locking block on the corresponding positioning post. The locking block cooperates with the clearance groove on the inner wall of the corresponding positioning hole. A receiving groove is provided at the end of the slider, which communicates with the first inclined surface and cooperates with the corresponding positioning post. A fourth lever is provided on the crank wheel. The movable ends of the two fourth levers are hinged to fourth rotating sleeves. The fourth rotating sleeves are connected to the fifth rotating sleeve provided on the first base plate through a fifth spring.

[0018] In one embodiment, an elastic pad is fitted between the first base plate and the second base plate, and fixing screws for inserting into the concrete are provided at the four lower corners of the second base plate.

[0019] The beneficial effects of this invention are: 1. The end cover assembly in this invention can achieve quick installation and disassembly of the housing, effectively improving the efficiency of installation and disassembly and maintenance. The end cover assembly has the advantage of preventing loosening due to vibration after installation, effectively avoiding the loosening of the end cover in traditional motors due to vibration during long-term use because the end cover is connected to the housing by simple bolts. It has higher safety and stability, which is conducive to the long-term stable and safe operation of the motor.

[0020] 2. The connecting seat assembly for connecting the end cover assembly and the rotating shaft in this invention facilitates quick and effective disassembly and separation of the end cover assembly and the rotating shaft without requiring the bearing to be removed from the shaft along with the end cover assembly. This improves the efficiency of end cover disassembly and avoids damage to the rotating shaft and bearing caused by the interference fit between the shaft and bearing during end cover disassembly, further improving the efficiency of motor disassembly and maintenance. Furthermore, after motor maintenance is completed, the end cover assembly can be quickly installed and connected to the bearing on the rotating shaft without requiring a second interference fit between the end cover assembly and the shaft and bearing, thus avoiding secondary damage to the bearing and shaft while effectively improving installation efficiency.

[0021] 3. In this invention, the bearing assembly used to connect the end cover assembly and the rotating shaft can automatically replenish lubricating grease when the grease around the balls inside the bearing is insufficient or fails. This is achieved through the significant movement of the balls caused by the lack of grease, preventing dry friction damage to the balls when grease is insufficient or fails, thus improving bearing life and effectively reducing motor maintenance costs. The bearing assembly in this invention can replenish grease after its internal storage is depleted, ensuring long-term continuous and effective operation of the bearing assembly.

[0022] 4. The base assembly in this invention enables the rapid installation, fixing, and disassembly of the motor on the ground, effectively improving the installation and disassembly efficiency of the motor. At the same time, the base assembly can automatically tighten any loose connections between the base assembly and the ground during long-term vibration of the motor, thereby effectively preventing the motor from becoming loose due to vibration and avoiding superimposed vibration damage caused by the motor generating greater amplitude vibration during operation due to a loose base. Attached Figure Description

[0023] Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is an overall sectional view of the motor; Figure 3 This is a first sectional view of the end cap assembly mating with the housing; Figure 4 This is a second sectional view of the end cap assembly mating with the housing; Figure 5 This is a third sectional view of the end cap assembly mating with the housing; Figure 6 This is a schematic diagram of the structure on the third rotating sleeve; Figure 7 This is a schematic diagram of the structure on the dome. Figure 8 This is the first sectional view of the rotating sleeve; Figure 9 This is a schematic diagram of the connecting screw structure; Figure 10 This is a schematic diagram of the rotating shaft structure; Figure 11This is a cross-sectional view of the first ring structure; Figure 12 This is a schematic diagram of a bearing assembly; Figure 13 This is the first sectional view of the bearing assembly; Figure 14 This is the second sectional view of the bearing assembly; Figure 15 This is the third sectional view of the bearing assembly; Figure 16 This is the fourth sectional view of the bearing assembly; Figure 17 This is a cross-sectional view of the inner and outer rings in a bearing assembly; Figure 18 This is a schematic diagram of the second ring structure in the bearing assembly; Figure 19 This is a cross-sectional view of the slip ring structure; Figure 20 This is a schematic diagram of a round rod structure; Figure 21 This is a schematic diagram of the casing structure; Figure 22 This is a partial sectional view of the casing structure; Figure 23 This is a cross-sectional view of the cooling fan structure; Figure 24 This is a schematic diagram of the base component structure; Figure 25 This is a sectional view of the base component structure; Figure 26 This is a schematic diagram of the slider structure in the base assembly; Figure 27 This is a schematic diagram of the positioning column structure in the base assembly; Figure 28 This is a partial schematic diagram of the first base plate structure in the base assembly; Labels in the diagram: 100. Motor; 101. Housing; 102. First locking structure; 103. Threaded groove; 104. Slide groove; 105. First annular groove; 106. Heat sink; 107. Push rod; 108. First end block; 109. First spring; 110. First gear; 111. First pivot pin; 112. Second gear; 113. First gear ring; 114. First lever; 115. Stator; 116. Rotor; 117. Shaft; 118. Shaft step; 119. End cover assembly; 120. Round cover; 121. First round hole; 122. Positioning groove; 123. Second annular groove; 124. First side ring; 125. Drive structure Structure; 126. Second circular hole; 127. Transmission groove; 128. Swing groove; 129. First rotating sleeve; 130. Keyway; 131. Third annular groove; 132. Connecting screw; 133. Guide key; 134. Limiting post; 135. Second end block; 136. Second spring; 137. Third gear; 138. Fourth gear; 139. First one-way ring; 140. Second rotating sleeve; 141. Fifth gear; 142. Incomplete gear; 143. Third rotating sleeve; 144. Vortex spring; 145. Hook; 146. Second lever; 147. First fixing pin; 148. Sixth gear; 149. Second gear ring; 150. 151. Seventh gear; 152. Eighth gear; 153. Crank handle; 154. Connecting seat assembly; 155. First ring sleeve; 156. Bearing chamber; 157. First ring plate; 158. Locating pin; 159. Locking nut sleeve; 160. Bearing assembly; 161. Inner ring; 162. First rolling groove; 163. Outer ring; 164. Second rolling groove; 165. Second side ring; 166. Fourth ring groove; 167. Grease reservoir; 168. First guide hole; 169. First movable groove; 170. Second guide hole; 171. Guide sleeve; 172. Ball bearing; 173. Second ring sleeve; 174. Hemispherical groove; 175. Grease filling chamber; 176. Second ring plate; 177. Connecting groove; 178. Rack; 179. Tension spring plate; 180. Slip ring; 181. Third guide hole; 182. Grease filling tube; 183. Third ring plate; 184. Third movable groove; 185. Fourth movable groove; 186. Third lever; 187. Round rod; 188. Arc tooth; 189. Ninth gear; 180. Second pivot pin; 191. Second one-way ring; 192. Tenth gear; 193. Third spring; 194. Eleventh gear; 195. Third one-way ring; 196. Second fixed pin; 197. Second movable groove; 198. Sliding sleeve; 199. Guide rod; 190. Fourth spring; 200. Base assembly; 201. Support leg; 202. First base plate; 203. Guide groove; 204. Positioning hole; 205. Clearance groove; 206. Slider; 207. First inclined surface; 208. Receiving groove; 209. Connecting rod; 210. Crank wheel; 211. Fourth lever; 212. Fourth rotating sleeve; 213. Fifth spring; 214. Fifth rotating sleeve; 215. Elastic pad; 216. Second base plate; 217. Fixing screw; 218. Positioning post; 219. Locking block; 220. Second inclined surface; 221. Second locking structure; 301. Sealing cover; 302. Protective cover; 303. Cooling fan; 304. Fan cover; 305. Third end block. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] like Figure 1-28 As shown, an easy-to-maintain three-phase asynchronous motor 100 is used to convert electrical energy into mechanical energy, comprising: An electric motor 100 is used to convert electrical energy into mechanical energy. The motor 100 includes a housing 101, a stator 115 disposed within the housing 101, a rotor 116 disposed within the stator 115 via a shaft 117, and two end cover assemblies 119 disposed at both ends of the housing 101. Each end cover assembly 119 includes a round cover 120. The round cover 120 is provided with a first locking structure 102 that allows for initial three-point axial connection and radial locking between the two components simply through axial fastening. The round cover 120 is also provided with... The drive structure 125, which enables the initial axial connection of the three points to further synchronously lock the round cover 120 and the housing 101, has a first locking structure 102 that allows for quick disassembly of the end cover assembly 119 and the housing 101. A detachable connecting seat assembly 153 is provided in the first round hole 121 in the middle of the round cover 120. The connecting seat assembly 153 is connected to the rotating shaft 117 through a bearing assembly 159. When the bearing assembly 159 causes the ball 171 to move due to grease failure, it can automatically replenish the grease to the ball 171.

[0026] A base assembly 200 is used to fix the motor 100. The base assembly 200 includes a first base plate 202 connected to the housing 101 by four support legs 201 and a second base plate 216 horizontally fixed to the ground. The second base plate 216 is provided with positioning posts 218 at the four corners that cooperate with positioning holes 204 on the first base plate 202. The first base plate 202 is provided with a second locking structure 221 that can be locked or disassembled with the four positioning posts 218 by only a small angle of adjustment and automatically prevents the first base plate 202 from loosening due to vibration with respect to the positioning posts 218.

[0027] In a further embodiment, such as Figures 2-10 , Figure 21 As shown, the first locking structure 102 includes a first side ring 124 disposed on the edge of the round cover 120. The first side ring 124 has three second round holes 126 spaced circumferentially at 120-degree intervals. A first rotating sleeve 129 is rotatably disposed within each of the second round holes 126. A connecting screw 132, which mates with a threaded groove 103 on the end face of the housing 101, is slidably disposed within the first rotating sleeve 129. The connecting screw 132 has a guide key 133 that mates with a keyway 130 on the inner wall of the first rotating sleeve 129. A limiting post 134, which mates with a third annular groove 131 on the inner wall of the second round holes 126, is disposed at the outer end of the connecting screw 132. A second end block 135 is disposed at the end of the limiting post 134. A second spring 136 connects the second end block 135 and the first rotating sleeve 129. The first rotating sleeve 129 has... The third gear 137 meshes with the fourth gear 138 located in the transmission groove 127 of the first side ring 124. The fourth gear 138 is located on the second rotating sleeve 140 in the transmission groove 127 via the first one-way ring 139. The second rotating sleeve 140 is provided with a fifth gear 141, which engages with an incomplete gear 142 located in the swing groove 128 of the first side ring 124 via the first fixing pin 147. The incomplete gear 142 is coaxially connected to the third rotating sleeve 143. The third rotating sleeve 143 is provided with a second lever 146 and a hook 145 that engages with the outer side of the corresponding end of the housing 101. A spiral spring 144 connects the third rotating sleeve 143 and the first fixing pin 147. The second lever 146 engages with a top rod 107 that slides radially in the sliding groove 104 of the housing 101.

[0028] In a further embodiment, such as Figure 2 , Figure 3As shown, the drive structure 125 includes a sixth gear 148 disposed on the first rotating sleeve 129. The sixth gear 148 meshes with a second gear ring 149 rotatably disposed in a second annular groove 123 on the outer side of the round cover 120. The second gear ring 149 meshes with a seventh gear 150 disposed on the round cover 120. The seventh gear 150 meshes with an eighth gear 151 disposed on the round cover 120. A crank handle 152 is disposed on the eighth gear 151.

[0029] In a further embodiment, such as Figure 2 , Figure 3 , Figure 21 , Figure 22 As shown, the outer end of the push rod 107 is provided with a first end block 108, and a first spring 109 is connected between the first end block 108 and the housing 101. The push rod 107 meshes with a first gear 110 that is provided on the housing 101 through a first pivot pin 111. A second gear 112 is provided on the first pivot pin 111. The second gear 112 meshes with a first gear ring 113 that is rotatably provided in a first annular groove 105 on the outer side of the housing 101. A first lever 114 is provided on the first gear ring 113.

[0030] In a further embodiment, such as Figure 2 , Figure 3 , Figure 7 , Figure 11 As shown, the connecting seat assembly 153 includes a first ring sleeve 154 that mates with the first circular hole 121. A first ring plate 156 that mates with the inner side of the circular cover 120 is provided on the outer side of one end of the first ring sleeve 154. A positioning pin 157 that mates with the positioning groove 122 on the inner side of the circular cover 120 is provided on the first ring sleeve 154. A locking sleeve 158 that mates with the outer side of the circular cover 120 is threadedly connected to the first ring sleeve 154. A bearing chamber 155 that mates with the bearing assembly 159 is opened on the inner side of the first ring sleeve 154.

[0031] In a further embodiment, such as Figures 12-20As shown, the bearing assembly 159 includes an inner ring 160 that mates with the shaft step 118 on the rotating shaft 117 and an outer ring 162 that mates with the bearing chamber 155 on the first ring sleeve 154. A first rolling groove 161 and a second rolling groove 163 are respectively formed on the outer cylindrical surface of the inner ring 160 and the inner cylindrical surface of the outer ring 162. A plurality of balls 171 are rolled around the axis of the inner ring 160 in the first rolling groove 161 and the second rolling groove 163. Two second side rings 164 are symmetrically arranged on the inner sides of both ends of the outer ring 162. An annular grease reservoir 166 is formed in each of the second side rings 164. A fourth annular groove 165 communicating with the corresponding grease reservoir 166 is formed on the inner end side of the second side ring 164. The grease reservoir 166 extends along the outer ring 162. A second ring plate 175 and a slip ring 179 are axially slidably arranged. The slip ring 179 is rotatably connected to a third ring plate 182. The slip ring 179 is located between the third ring plate 182 and the second ring plate 175. A third lever 185 and two round rods 186 spaced circumferentially at 180-degree intervals are provided on the end face of the third ring plate 182. The round rods 186 and the third lever 185 move in the first movable groove 168 and the second movable groove 196 on the outer end face of the second side ring 164, respectively. A grease supply tube 181 for replenishing grease into the space between the second ring plate 175 and the slip ring 179 is provided on the end face of the slip ring 179. A sealing cap 301 is threaded to the end of the grease supply tube 181. The grease supply tube 181 moves in the third ring plate 182. The fourth movable groove 184 on the ring plate 182 and the second guide hole 169 on the outer end face of the second side ring 164 are connected to the corresponding second ring plate 175. The fourth annular groove 165 slides along the axial direction of the outer ring 162 and is connected to the corresponding second ring plate 175. The second ring sleeve 172 has an annular grease filling cavity 174. The grease filling cavity 174 communicates with the circumferentially evenly distributed connecting grooves 176 on the second ring plate 175. The end face of the second ring sleeve 172 has a plurality of hemispherical grooves 173 that correspond one-to-one with the balls 171 and communicate with the grease filling cavity 174. The end face of the second ring plate 175 is provided with two racks 177 that are circumferentially spaced at 180 degrees. The racks 177 move in the third guide hole 180 on the sliding ring 179. The rack 177 has a tension spring plate 178 at its end, located within the third movable groove 183 on the three-ring plate 182 and the first guide hole 167 on the outer end face of the second side ring 164. A third spring 192 connects the tension spring plate 178 to the outer end face of the second side ring 164. The round rod 186 has arc teeth 187 that mesh with a ninth gear 188 located on the outer end face of the second side ring 164 via a second pivot pin 189. A tenth gear 191, which meshes with the rack 177, is located on the second pivot pin 189 via a second one-way ring 190. The ninth gear 188 meshes with an eleventh gear 193, which is mounted on a second fixed pin 195 via a third one-way ring 194.The second fixing pin 195 is disposed on the outer end face of the second side ring 164.

[0032] In a further embodiment, such as Figure 13 As shown, a sliding sleeve 197 is provided on the third lever 185, and a guide rod 198 is provided on the sliding sleeve 197. The guide rod 198 slides around the central axis of the outer ring 162 within the guide sleeve 170 on the outer end face of the second side ring 164. A third end block 305 is provided at the end of the guide rod 198. A fourth spring 199 is connected between the third end block 305 and the guide sleeve 170 to engage the arc tooth 187 with the ninth gear 188.

[0033] In a further embodiment, such as Figure 1 , Figure 2 , Figure 21 As shown, heat sinks 106 are evenly arranged on the outer side of the housing 101, and a cooling fan 303 for cooling the heat sinks 106 is provided on the rotating shaft 117. The two round covers 120 are respectively threaded with a fan cover 304 for protecting the cooling fan 303 and a protective cover 302 for shielding the first locking structure 102 and the driving structure 125.

[0034] In a further embodiment, such as Figures 24-28 As shown, the second locking structure 221 includes guide grooves 203 that are parallel to each other and are provided on the upper surface of the first base plate 202. Each guide groove 203 corresponds to two positioning holes 204. A crank wheel 210 is provided in the middle of the guide groove 203. Two connecting rods 209 are hinged to the crank wheel 210, which are distributed at 180-degree intervals in the circumference and correspond one-to-one with the two corresponding positioning holes 204. A slider 206 is hinged to the movable end of the connecting rod 209. The slider 206 slides in the corresponding guide groove 203. The slider 206 is provided with a connection to its end face and the corresponding positioning hole 204. The second inclined surface 220 on the lower side of the locking block 219 on the column 218 engages with the first inclined surface 207. The locking block 219 engages with the relief groove 205 on the inner wall of the corresponding positioning hole 204. The end of the slider 206 is provided with a receiving groove 208 that communicates with the first inclined surface 207 and engages with the corresponding positioning column 218. The crank wheel 210 is provided with a fourth lever 211. The movable ends of the two fourth levers 211 are hinged with a fourth rotating sleeve 212. The fourth rotating sleeve 212 is connected to the fifth rotating sleeve 214 provided on the first base plate 202 through a fifth spring 213.

[0035] In a further embodiment, such as Figure 24 As shown, an elastic pad 215 is fitted between the first base plate 202 and the second base plate 216, and fixing screws 217 for inserting into the concrete are provided at the four lower corners of the second base plate 216.

[0036] The end cap assembly 119 in this invention enables quick installation and disassembly of the housing 101, effectively improving installation and disassembly / maintenance efficiency. Furthermore, the end cap assembly 119 prevents loosening due to vibration after installation, effectively avoiding the loosening caused by vibration during long-term use of the end cap in traditional motors 100, which is connected to the housing 101 with simple bolts. This provides higher safety and stability, contributing to the long-term stable and safe operation of the motor 100. The connecting seat assembly 153 in this invention, used to connect the end cap assembly 119 and the rotating shaft 117, facilitates quick and effective disassembly and separation of the end cap assembly 119 and the rotating shaft 117 without requiring the bearing to be removed from the rotating shaft 117 along with the end cap assembly 119. This improves the efficiency of end cap disassembly and avoids damage to the rotating shaft 117 and bearing caused by the interference fit between them during end cap disassembly, further enhancing the disassembly and maintenance efficiency of the motor 100. Furthermore, after the motor 100 is repaired, the end cover assembly 119 can be quickly installed and connected to the bearing on the shaft 117 without requiring a second interference fit between the end cover assembly 119, the shaft 117, and the bearing. This avoids secondary damage to the bearing and shaft 117 and effectively improves installation efficiency. In this invention, the bearing assembly 159 used to connect the end cover assembly 119 and the shaft 117 automatically replenishes lubricating grease when the grease around the balls 171 inside the bearing is insufficient or ineffective. This is achieved through the significant movement of the balls 171 caused by the lack of grease, preventing dry friction damage to the balls 171 when grease is insufficient or ineffective. This improves bearing life and effectively reduces the maintenance cost of the motor 100. The bearing assembly 159 in this invention can be replenished with grease after its internal storage is depleted, ensuring long-term continuous and effective operation of the bearing assembly 159. The base assembly 200 in this invention enables the rapid installation, fixing, and disassembly of the motor 100 on the ground, effectively improving the installation and disassembly efficiency of the motor 100. At the same time, the base assembly 200 can automatically tighten any loose connections between the base assembly 200 and the ground during prolonged vibration of the motor 100, thereby effectively preventing the motor 100 from becoming loose due to vibration and avoiding superimposed vibration damage caused by the motor 100 generating greater amplitude vibrations during its operation due to a loose base.

[0037] The operation flow of this invention is as follows: In the initial state, the four sliders 206 in the second locking structure 221 block the corresponding positioning holes 204.

[0038] When it is necessary to install and fix the motor 100 on the ground, first dig a pit with a certain depth and an area equivalent to that of the second base plate 216 at the corresponding position on the ground. Fill the pit with concrete until it is flush with the ground, and then place the second base plate 216 flat on the concrete surface so that the four fixing screws 217 on the underside of the second base plate 216 are inserted into the concrete. After the concrete has solidified, the fixing screws 217 will firmly fix the second base plate 216 to the ground.

[0039] Then, an elastic pad 215 is placed on the second base plate 216, so that the four positioning pins 218 pass through the four holes on the elastic pad 215. Next, the two fourth levers 211 are moved to overcome the elastic force of the two fifth springs 213. The fourth levers 211 drive the slider 206 to retract and slide and disengage from the positioning hole 204 through the crank wheel 210 and connecting rod 209. Then, the first base plate 202 at the bottom of the motor 100 is placed on the elastic pad 215, so that the four positioning pins 218 pass through the positioning hole 204 on the first base plate 202. Next, the two fourth levers 211 are swung in the opposite direction. The two fourth levers 211 drive the four sliders 206 to slide towards the positioning post 218, so that the positioning post 218 enters the receiving groove 208 on the slider 206. The first inclined surface 207 on the slider 206 interacts with the second inclined surface 220 on the lower side of the locking block 219 on the positioning post 218, so that the slider 206 moves downward relative to the positioning post 218, thereby causing the first base plate 202 to squeeze the elastic pad 215, thus fixing the second base plate 216 on the ground. At the same time, the fifth spring 213 provides tension so that the first inclined surface 207 on the slider 206 interacts with the second inclined surface 220 on the retaining ring at all times, so that the slider 206 fills the gap between the second base plate 216 and the first base plate 202 caused by vibration, ensuring that the second base plate 216 will not loosen due to vibration and reducing the damage caused by vibration.

[0040] Before the end cap assembly 119 is installed on the housing 101, the limiting post 134 at the end of the connecting screw 132 in the end cap assembly 119 abuts against the end face of the third annular groove 131 in the corresponding first rotating sleeve 129 under the action of the second spring 136. The hook 145 abuts against the side wall of the corresponding swing groove 128 under the action of the corresponding spiral spring 144. The push rod 107 on the housing 101 protrudes from the inner wall of the housing 101 under the action of the corresponding first spring 109. The incomplete gear 142 does not mesh with the corresponding fifth gear 141. The connecting seat assembly 153 is installed in the first round hole 121 on the pressure cover. The two second annular sleeves 172 in the bearing assembly 159 press against each other axially under the action of the two third springs 192 and form a retainer that cooperates with the ball 171. The arc tooth 187 on the round rod 186 in the bearing assembly 159 meshes with the corresponding ninth gear 188.

[0041] Before installing the end cap assembly 119 onto the housing 101, first install the connecting seat assembly 153 into the first circular hole 121 on the round cover 120, then install the bearing assembly 159 onto the shaft step 118 of the rotating shaft 117 and into the bearing chamber 155 of the connecting seat assembly 153. Next, fasten the end cap assembly 119 axially toward the corresponding end of the housing 101, so that the three connecting screws 132 are opposite to the threaded grooves 103 on the end face of the housing 101. The connecting screws 132 first enter the threaded grooves 103 and, under the pressure of the housing 101, overcome the second spring 136 and move outwards from the second circular hole 126 by a certain amount. Then, the second lever 146 meets and interacts with the corresponding push rod 107. The second lever 146 overcomes the elastic force of the coil spring 144 and drives the corresponding hook 145 to hook onto the outside of the corresponding end of the housing 101. At the same time, the second lever 146 passes through the incomplete gear 1 42. The fifth gear 141, the second rotating sleeve 140, the first one-way ring 139, the fourth gear 138, the third gear 137, and the first rotating sleeve 129 drive the corresponding connecting screw 132 to rotate a certain amplitude. The connecting screw 132 is partially screwed into the corresponding spiral groove, so that the round cover 120 and the housing 101 are initially connected. Then, the crank handle 152 is turned. The crank handle 152 drives all the sixth gears 148 to rotate synchronously through the eighth gear 151, the seventh gear 150, and the second gear ring 149. The three sixth gears 148 drive the corresponding connecting screw 132 to rotate into the corresponding spiral groove through the first rotating sleeve 129 until the limiting post 134 on the connecting screw 132 abuts against the end face of the third ring groove 131 in the corresponding first rotating sleeve 129, thereby completing the tight connection between the round cover 120 of the end cover assembly 119 and the housing 101 by the connecting screw 132. During the process of screwing the connecting screw 132 in via the crank 152, the first one-way ring 139 does not function.

[0042] During the operation of the motor 100, the motor 100 will vibrate. The connecting screw 132 in the end cover assembly 119 may rotate in the opposite direction, causing the connecting screw 132 to loosen. The reverse rotation of the connecting screw 132 will drive the corresponding hook 145 and the second lever 146 to swing in the opposite direction through the first rotating sleeve 129, the third gear 137, the fourth gear 138, the first one-way ring 139, the second rotating sleeve 140, the fifth gear 141, the incomplete gear 142 and the third rotating sleeve 143. However, the corresponding push rod 107 will prevent the second lever 146 from swinging, thereby preventing the connecting screw 132 from rotating in the opposite direction and becoming loose.

[0043] When the end cap assembly 119 needs to be disassembled for maintenance, the first lever 114 at the corresponding end is first moved. The first lever 114 drives the push rod 107 to slide away from the second lever 146 through the first gear ring 113, the second gear 112, the first pivot pin 111, and the first gear 110. The three third rotating sleeves 143 drive the fifth gear 141 to rotate freely through the incomplete gear 142 under the action of the corresponding spiral springs 144. At this time, the first one-way ring 139 does not play a role. When the third rotating sleeve 143 drives the hook 145 to swing back and reset, the incomplete gear 142 ends its engagement with the fifth gear 141. Then, the crank handle 152 is cranked in the opposite direction. The crank handle 152 drives the connecting screw 132 to rotate in the opposite direction through a series of transmissions. The connecting screw 132 drives the fifth gear 141 to rotate freely through the third gear 137, the fourth gear 138, the first one-way ring 139, and the second rotating sleeve 140 until the connecting screw 132 disengages from the spiral groove at the corresponding end of the housing 101, thus completing the separation of the end cover assembly 119 from the housing 101.

[0044] Before disassembling the end cover assembly 119, first rotate the locking nut 158 ​​to disengage from the first ring sleeve 154, ensuring that the end cover assembly 119 is separated from the connecting seat assembly 153 when it is separated from the housing 101. This allows the connecting seat assembly 153 to remain connected to the bearing assembly 159 on the rotating shaft 117 without having to painstakingly remove the bearing assembly 159 from the rotating shaft 117, thus improving the efficiency of installing the end cover assembly 119 and the bearing assembly 159 after maintenance.

[0045] During the operation of the motor 100, if the grease around the balls 171 in the bearing assembly 159 fails or is completely consumed due to high temperature, the gap between the balls 171 and the corresponding two second ring sleeves 172 will increase. During the high-speed rotation and rolling process, the balls 171 will move around. The moving balls 171 will push the two second ring sleeves 172 back and forth into the corresponding grease chambers 166. During the movement of the second ring sleeves 172 towards the grease chambers 166, the second ring sleeves 172 drive the corresponding two racks 177 to move synchronously through the corresponding second ring plates 175. The second ring plates 175 squeeze the grease in the grease chambers 166 through the connecting grooves 176 and the grease filling chambers 174 into the hemispherical grooves 173 on the end face of the second ring sleeves 172 to replenish the grease on the surface of the balls 171. At the same time, the rack 177 connected to the second ring 172 overcomes the elastic force of the corresponding third spring 192 and drives the corresponding tenth gear 191 to rotate freely. At this time, the second one-way ring 190 does not play a role.

[0046] When the ball bearing 171 disengages from the second ring sleeve 172, the rack 177, under the action of the corresponding third spring 192, drives the second ring sleeve 172 to reset via the second ring plate 175. Simultaneously, the rack 177, through the tenth gear 191, the second one-way ring 190, the second pivot pin 189, the ninth gear 188, and the arc teeth 187 on the corresponding round rod 186, drives the round rod 186 to move synchronously and in the same direction as the rack 177. The ninth gear 188 drives the corresponding eleventh gear 193 to idle. At this time, the third one-way ring 194 does not function. The round rod 186, through the third ring plate 182, drives the slip ring 179 to move synchronously and in the same direction as the third ring sleeve, ensuring that the space between the slip ring 179 and the third ring sleeve does not increase due to the reset of the third ring sleeve, and that the grease squeezed out of the third ring sleeve is re-inhaled into the grease reservoir 166 under negative pressure.

[0047] When the third ring sleeve is reset, if the slip ring 179 moves away from the third ring sleeve, the slip ring 179 will drive the round rod 186 to move outward through the third ring plate 182. The arc teeth 187 on the round rod 186 will drive the ninth gear 188 to rotate. However, at this time, the third one-way ring 194 plays a role. The second fixing pin 195 will prevent the eleventh gear 193 from rotating through the third one-way ring 194. The eleventh gear 193 will prevent the round rod 186 from moving outward through the ninth gear 188, so that the distance between the slip ring 179 and the third ring sleeve will not change, ensuring that the grease around the ball 171 will not be sucked back into the grease reservoir 166.

[0048] When the grease in the grease reservoir 166 is about to run out, the third lever 185 is activated. The third lever 185 overcomes the elastic force of the corresponding fourth spring 199 and drives the third ring plate 182 to rotate relative to the slip ring 179. The third ring plate 182 drives the round rod 186 to rotate synchronously, causing the arc teeth 187 on the round rod 186 to disengage from the corresponding ninth gear 188. Then, the sealing cap 301 at the end of the grease replenishment pipe 181 is opened, and grease is squeezed into the grease reservoir 166 through the grease replenishment pipe 181 to replenish the grease. Under the action of the grease filling, the slip ring 179 drives the third ring plate 182 to perform axial reset. The third ring plate 182 drives the round rod 186 and the third lever 185 to move synchronously, and the third lever 185 slides relative to the corresponding sliding sleeve 197. After the grease in the grease reservoir 166 is replenished, the sealing cap 301 is put back on the end of the grease filling pipe 181. The third lever 185 drives the third ring plate 182 to rotate and reset under the action of the corresponding fourth spring 199. The third ring plate 182 drives the two round rods 186 to reset, and the arc teeth 187 on the round rods 186 re-mesh with the corresponding ninth gear 188.

Claims

1. A maintainable three-phase asynchronous motor for converting electrical energy into mechanical energy, characterized in that, include: An electric motor is used to convert electrical energy into mechanical energy. The motor includes a housing, a stator disposed within the housing, a rotor disposed within the stator via a rotating shaft, and two end cover assemblies disposed at both ends of the housing. Each end cover assembly includes a round cover. The round cover is provided with a first locking structure that enables a three-point initial axial connection and radial locking between the two components simply by axial fastening. The round cover is also provided with a drive structure that further enables synchronous axial locking of the round cover and the housing through the three-point initial axial connection. The first locking structure enables quick disassembly of the end cover assembly and the housing. A detachable connecting seat assembly is disposed in a first round hole in the center of the round cover. The connecting seat assembly is connected to the rotating shaft via a bearing assembly. When the balls inside the bearing assembly shift due to grease failure, the bearing assembly can automatically replenish the grease to the balls. A base assembly for fixing a motor includes a first base plate connected to the housing via four legs and a second base plate horizontally fixed to the ground. The four corners of the second base plate are provided with positioning posts that mate with positioning holes on the first base plate. The first base plate is provided with a second locking structure that can be locked or disengaged from the four positioning posts by only a small angle adjustment and automatically prevents the first base plate from loosening due to vibration.

2. The easily maintainable three-phase asynchronous motor according to claim 1, characterized in that, The first locking structure includes a first edge ring disposed on the edge of the round cover. The first edge ring has three second circular holes spaced 120 degrees circumferentially. A first rotating sleeve is rotatably disposed within each of the second circular holes. A connecting screw, which mates with a threaded groove on the end face of the housing, is slidably disposed within the first rotating sleeve. The connecting screw has a guide key that mates with a keyway on the inner wall of the first rotating sleeve. A limiting post is disposed at the outer end of the connecting screw, which mates with a third annular groove on the inner wall of the end of each of the second circular holes. A second end block is disposed at the end of the limiting post. A second spring connects the second end block to the first rotating sleeve. A third gear is provided on the upper part, which meshes with a fourth gear located in the transmission groove on the first side ring. The fourth gear is located on a second rotating sleeve in the transmission groove via a first one-way ring. A fifth gear is provided on the second rotating sleeve, which engages with an incomplete gear located in the swing groove on the first side ring via a first fixing pin. The incomplete gear is coaxially connected to the third rotating sleeve. A second lever and a hook that engages with the outer side of the corresponding end of the housing are provided on the third rotating sleeve. A spiral spring connects the third rotating sleeve and the first fixing pin. The second lever engages with a top rod that slides radially in a sliding groove on the housing.

3. The easily maintainable three-phase asynchronous motor according to claim 2, characterized in that, The drive structure includes a sixth gear disposed on the first rotating sleeve, the sixth gear meshing with a second gear ring rotatably disposed in a second annular groove on the outer side of the round cover, the second gear ring meshing with a seventh gear disposed on the round cover, the seventh gear meshing with an eighth gear disposed on the round cover, and a crank handle disposed on the eighth gear.

4. The easily maintainable three-phase asynchronous motor according to claim 2, characterized in that, The outer end of the push rod is provided with a first end block, and a first spring is connected between the first end block and the housing. The push rod meshes with a first gear that is set on the housing through a first pivot pin. A second gear is provided on the first pivot pin. The second gear meshes with a first gear ring that is rotatably set in a first annular groove on the outer side of the housing. A first lever is provided on the first gear ring.

5. The easily maintainable three-phase asynchronous motor according to claim 1, characterized in that, The connecting seat assembly includes a first ring sleeve that mates with a first circular hole. A first ring plate that mates with the inner side of a circular cover is provided on the outer side of one end of the first ring sleeve. A positioning pin that mates with a positioning groove on the inner side of the circular cover is provided on the first ring plate. A locking nut that mates with the outer side of the circular cover is threaded onto the first ring sleeve. A bearing chamber that mates with a bearing assembly is provided on the inner side of the first ring sleeve.

6. The easily maintainable three-phase asynchronous motor according to claim 5, characterized in that, The bearing assembly includes an inner ring that mates with the shaft step and an outer ring that mates with a bearing housing fitted onto a first ring. A first rolling groove and a second rolling groove are respectively formed on the outer cylindrical surface of the inner ring and the inner cylindrical surface of the outer ring. A plurality of balls are rolled around the axis of the inner ring in the first and second rolling grooves. Two second side rings are symmetrically arranged on the inner sides of both ends of the outer ring. An annular grease reservoir is formed within each second side ring. A fourth annular groove communicating with the corresponding grease reservoir is formed on the inner end of each second side ring. A second ring is slidably disposed within the grease reservoir along the axial direction of the outer ring. The system comprises a plate and a slip ring, wherein the slip ring is rotatably connected to a third ring plate and is located between the third ring plate and the second ring plate. The end face of the third ring plate is provided with a third lever and two round rods spaced 180 degrees circumferentially. The round rods and the third lever move within a first movable groove and a second movable groove on the outer end face of the second ring, respectively. The end face of the slip ring is provided with a grease supply tube for replenishing grease into the space between the second ring plate and the slip ring. The end of the grease supply tube is threaded with a sealing cap. The grease supply tube moves within a fourth movable groove and a second movable groove on the third ring plate. Within the second guide hole on the outer end face of the two side rings, a second ring sleeve, connected to the corresponding second ring plate, slides axially along the outer ring groove within the fourth ring groove. An annular grease filling cavity is formed within the second ring sleeve, communicating with circumferentially evenly distributed connecting grooves on the second ring plate. Several hemispherical grooves, corresponding one-to-one with the ball bearings and communicating with the grease filling cavity, are formed on the end face of the second ring sleeve. Two racks, spaced 180 degrees circumferentially apart, are provided on the end face of the second ring plate. The racks move along the third guide hole on the slip ring, the third movable groove on the third ring plate, and the... Inside the first guide hole on the outer end face of the two side rings, a tension spring plate is provided at the end of the rack. A third spring is connected between the tension spring plate and the outer end face of the second side ring. An arc tooth is provided on the round rod. The arc tooth meshes with a ninth gear that is set on the outer end face of the second side ring through a second pivot pin. A tenth gear that meshes with the rack is provided on the second pivot pin through a second one-way ring. The ninth gear meshes with an eleventh gear. The eleventh gear is set on a second fixed pin through a third one-way ring. The second fixed pin is set on the outer end face of the second side ring.

7. A maintainable three-phase asynchronous motor according to claim 6, characterized in that, The third lever is provided with a sliding sleeve, and the sliding sleeve is provided with a guide rod. The guide rod slides around the central axis of the outer ring within the guide sleeve on the outer end face of the second side ring. The end of the guide rod is provided with a third end block, and a fourth spring is connected between the third end block and the guide sleeve to make the arc teeth mesh with the ninth gear.

8. A maintainable three-phase asynchronous motor according to claim 2, characterized in that, The outer side of the housing is evenly provided with heat sinks, and the rotating shaft is provided with a cooling fan to dissipate heat from the heat sinks. The two round covers are respectively threaded with a fan cover for protecting the cooling fan and a protective cover for shielding the first locking structure and the driving structure.

9. A maintainable three-phase asynchronous motor according to claim 1, characterized in that, The second locking structure includes guide grooves that are parallel to each other and are located on the upper surface of the first base plate. Each guide groove corresponds to two positioning holes. A crank wheel is located in the middle of the guide groove. Two connecting rods are hinged to the crank wheel and are distributed at 180-degree intervals around the circumference, corresponding to the two positioning holes. A slider is hinged to the movable end of the connecting rod. The slider slides in the corresponding guide groove. A first inclined surface is provided on the slider, which communicates with its end face and cooperates with the second inclined surface on the lower side of the locking block on the corresponding positioning post. The locking block cooperates with the clearance groove on the inner wall of the corresponding positioning hole. A receiving groove is provided at the end of the slider, which communicates with the first inclined surface and cooperates with the corresponding positioning post. A fourth lever is provided on the crank wheel. A fourth rotating sleeve is hinged to the movable end of each of the two fourth levers. The fourth rotating sleeve is connected to the fifth rotating sleeve located on the first base plate through a fifth spring.

10. A maintainable three-phase asynchronous motor according to claim 1, characterized in that, An elastic pad is fitted between the first base plate and the second base plate, and fixing screws for inserting into the concrete are provided at the four lower corners of the second base plate.

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