CN107465297B

CN107465297B - Driving assembly and electric equipment applying same

Info

Publication number: CN107465297B
Application number: CN201610388607.0A
Authority: CN
Inventors: 孙持平; 塔静宁; 杨圣骞; 信飞; 杨修文; 崔艳云
Original assignee: Dechang Motor (Shenzhen) Co Ltd
Current assignee: Dechang Motor (Shenzhen) Co Ltd
Priority date: 2016-06-02
Filing date: 2016-06-02
Publication date: 2020-09-01
Anticipated expiration: 2036-06-02
Also published as: CN107465297A

Abstract

The invention provides a driving assembly and an electric appliance using the same, the driving assembly comprises: a motor having an output shaft; a load connection mechanism rotatably sleeved to the output shaft; the delay synchronization mechanism is provided with a buffer piece, and two ends of the buffer piece are respectively connected to the output shaft and the load connection mechanism; a one-way clutch mechanism coupled between the output shaft and the load coupling mechanism, the one-way clutch mechanism permitting rotation of the load coupling mechanism relative to the output shaft in a first circumferential direction and limiting an angular range of rotation of the load coupling mechanism relative to the output shaft in an opposite second circumferential direction. The problem that the motor is difficult to start is solved through the arrangement of the one-way clutch mechanism and the delay synchronization mechanism; meanwhile, the one-way clutch mechanism can prevent the buffering piece in the delay synchronizing mechanism from being excessively deformed to cause permanent deformation of a flexible mechanical piece, so that the normal operation of the buffering piece is ensured, and the service life of the delay synchronizing mechanism is prolonged.

Description

Driving assembly and electric equipment applying same

Technical Field

The invention relates to a driving assembly and electrical equipment such as a fan or a water pump and the like applying the driving assembly.

Background

When a large-diameter fan is fixedly connected to an output shaft of a motor and the fan is driven to rotate by the motor, the inertia of fan blades is large and the motor is difficult to start, and in an invention patent of fan motor with the patent number of CN1595776, a spiral spring is wound around the output shaft of the motor, one end of the spiral spring is connected with an assembly hole near a shaft hole of the fan blade, and the other end of the spiral spring is fixed to an assembly hole of a retainer connected with the output shaft through pressing and the like. The spiral spring can absorb the inertia force of the fan blades when the motor is started, so that the inertia moment required by the starting of the output shaft is reduced, and then along with the rising of the rotation moment of the output shaft, the absorbed force is released, so that the fan blades rotate along with the output shaft.

However, the above patent of invention has the following problems: when the fan is in a static state, the spiral spring is in an original state; when the fan starts to rotate under the drive of the motor and the rotating shaft of the motor keeps rotating, the outer diameter of the spiral spring is reduced, and finally all the coil layers of the spiral spring are in a tightening state along with the reduction of the outer diameter. When the motor stops operating, the coil spring is subjected to a force of deflecting in the opposite direction by the rotational kinetic energy stored in the fan, so that the outer diameter thereof is abnormally increased. The rotational kinetic energy is continuously applied to the coil spring and deforms the coil spring more severely; this force eventually disappears, but causes an unrecoverable deformation of the coil spring. This is because when the motor is suddenly stopped, the rotational kinetic energy stored in the fan may cause the coil spring to be twisted in the opposite direction until the rotational kinetic energy is completely transmitted to the coil spring, which may cause permanent damage to the coil spring, and the deformed coil spring has a very limited function, that is, the above patent does not perfectly solve the problem of the difficulty in starting the motor.

Disclosure of Invention

Features and advantages of the invention will be set forth in part in the description which follows, or may be obvious from the description, or may be learned by practice of the invention.

To overcome the problems of the prior art, an aspect of the present invention provides a driving assembly, comprising: a motor having an output shaft; a load connection mechanism rotatably fitted to the output shaft; the delay synchronization mechanism comprises a buffer piece, and two ends of the buffer piece are respectively connected to the output shaft and the load connection mechanism so as to delay and synchronize the rotating speeds of the output shaft and the load connection mechanism; a one-way clutch mechanism connected between the output shaft and the load coupling mechanism, the one-way clutch mechanism allowing rotation of the load coupling mechanism relative to the output shaft in a first circumferential direction and limiting an angular range of rotation of the load coupling mechanism relative to the output shaft in an opposite second circumferential direction.

As a modified solution of the present invention, the buffer member is a coil spring sleeved to the output shaft.

As a modified version of the present invention, the load connecting mechanism has a shaft hole to be rotatably fitted to the output shaft; the one-way clutch mechanism is accommodated in the shaft hole.

As a modification of the present invention, the one-way clutch mechanism includes: the limiting groove is arranged on the inner wall of the shaft hole and comprises a groove bottom, a first groove wall and a second groove wall, wherein the first groove wall and the second groove wall are respectively positioned on two sides of the groove bottom; the clamping piece is mounted on the output shaft and synchronously rotates along with the output shaft, can be reset and protrudes out of the outer peripheral surface of the output shaft, so that when the load connecting mechanism rotates relative to the output shaft along a first circumferential direction, the clamping piece can enter the limiting groove through the second groove wall and leave the limiting groove under the guidance of the first groove wall, and when the load connecting mechanism rotates relative to the output shaft along a second opposite circumferential direction, the clamping piece enters the limiting groove through the first groove wall and is limited by the second groove wall, and therefore the load connecting mechanism is interlocked with the motor shaft.

As an improved scheme of the present invention, the clip is a spring plate, one end of the spring plate is directly or indirectly connected to the surface of the output shaft, and the other end of the spring plate is tilted with respect to the surface of the output shaft.

As a modified aspect of the present invention, the outer peripheral surface of the output shaft is provided with a concave hole, and the engaging member is a compression spring fitted into the concave hole, and the compression spring partially protrudes from the outer peripheral surface of the output shaft in a free state.

As a modified aspect of the present invention, the output shaft has a recess hole in its outer peripheral surface, a compression spring is mounted in the recess hole, and the latch member is mounted to the recess hole and supported by the compression spring, and partially protrudes from the outer peripheral surface of the output shaft in a free state of the compression spring.

As an improved scheme of the invention, the number of the limiting grooves is n, the limiting grooves are arranged at intervals along the circumferential direction of the shaft hole, and n is a natural number.

As a modified scheme of the invention, the number of the clamping pieces is n, the clamping pieces are arranged at intervals along the circumferential direction of the output shaft, and n is a natural number.

As a modified solution of the present invention, the one-way clutch mechanism includes a metal band tightly hooped to the output shaft, and a portion of the metal band is tilted to form the elastic piece.

As an improved scheme of the present invention, the first slot wall is an arc surface.

As a modified solution of the present invention, the second groove wall is a plane.

As a development of the invention, the load connection is a fan blade or a hub of a fan blade.

As an improvement of the present invention, the motor is a single-phase permanent-magnet ac motor or a single-phase brushless dc motor, and includes a stator and a permanent-magnet rotor rotatable relative to the stator, the permanent-magnet rotor includes the rotating shaft and a permanent-magnet rotor body sleeved on the rotating shaft, the stator includes a stator magnetic core and a stator winding wound on the stator magnetic core and powered by an ac power source, the rotor body has a predetermined starting direction and operates at a constant speed of 60f/p turns/min in a steady-state stage each time the motor is powered on, where f is a frequency of the ac power source, and p is a number of pole pairs of the permanent-magnet rotor.

The invention also provides an electrical device, which comprises a fan blade or an impeller, wherein the fan blade or the impeller comprises a hub part and a plurality of blades connected to the hub part, and the electrical device is characterized by further comprising the driving component provided by the first aspect of the invention, and the hub part of the fan blade or the impeller is used as a load connecting mechanism of the driving component.

As a development of the invention, the electrical device is a fan or a pump.

The features and content of these solutions will be better understood by those skilled in the art from reading the present description.

Drawings

The advantages and realisation of the invention will be more apparent from the following detailed description, given by way of example, with reference to the accompanying drawings, which are given for the purpose of illustration only, and which are not to be construed in any way as limiting the invention, and in which:

fig. 1 is a schematic structural diagram of a driving assembly according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a delay synchronization mechanism in the driving assembly shown in fig. 1.

Fig. 3 is a top view of the load coupling mechanism in the drive assembly of fig. 1.

Fig. 4 is a schematic diagram of a card member structure in a driving assembly according to a second embodiment of the invention.

Fig. 5 is a schematic view of the fastening of the clip member of fig. 4 to the output shaft.

Fig. 6 is a schematic view showing the structure of the clamp to the output shaft in the driving assembly of the card media of the third embodiment of the present invention.

Fig. 7 is a plan view of a one-way clutch mechanism according to a fourth embodiment of the invention.

Fig. 8 is a plan view of a one-way clutch mechanism of a fifth embodiment of the invention.

Fig. 9 is a top view of a load coupling mechanism in a fifth embodiment of the present invention.

Fig. 10 is a schematic view of an operating state of the driving assembly according to the embodiment of the invention.

Fig. 11 is a schematic structural view of a motor in the driving assembly shown in fig. 1.

Fig. 12 is a schematic structural view of a rotor and a stator core of the motor shown in fig. 11.

Fig. 13 is a block diagram of a drive circuit of the motor shown in fig. 11.

Fig. 14 is a schematic structural diagram of a fan according to an embodiment of the invention.

Fig. 15 is a schematic cross-sectional view of a fan according to an embodiment of the invention.

Detailed Description

As shown in fig. 1, the present invention provides a drive assembly 100 including a motor 10 having an output shaft 21, a load connection mechanism 40, a delay synchronization mechanism 110 for delaying synchronization of the rotational speeds of the output shaft and the load connection mechanism, and a one-way clutch mechanism 80 connected between the output shaft 21 and the load connection mechanism 40; wherein, the load connecting mechanism 40 is provided with a shaft hole 41 to be rotatably sleeved on the output shaft 21.

As shown in fig. 2, the delay locked mechanism 110 includes a fixed seat 112 and an elastic member 119 having a variable inner and outer diameter. The fixing base 112 is fixedly sleeved on the rotating shaft 21 so as to rotate along with the rotating shaft 21, and it can be understood that the fixing base 112 can also be movably connected to the rotating shaft in a connection manner similar to a spline, as long as the fixing base and the rotating shaft can keep rotating synchronously. In this embodiment, the elastic element 119 is a coil spring, and is sleeved on the rotating shaft 21, one end of the elastic element is fixed or movably connected to the fixing base 112 and can rotate synchronously with the fixing base, and the other end of the elastic element is fixed or movably connected to the load connecting mechanism 40 and can rotate synchronously with the load connecting mechanism 40.

When the rotating shaft 21 starts to rotate from a static state, the fixed seat 112 and the rotating shaft 21 rotate synchronously, a rotation speed difference exists between the rotating shaft 21 and the load connecting mechanism 40, that is, the rotation speed of the fixed seat 112 is greater than that of the load connecting mechanism 40, and one end of the elastic element 119, which is close to the fixed seat 112, is screwed so that the inner diameter is reduced and finally rotates synchronously with the fixed seat 112; the end of the elastic member 119 that is closer to the load connection mechanism 40 is also finally tightened so that the inner diameter is reduced and finally rotates synchronously with the fixed seat 112. Therefore, the elastic member 119 serves as a buffer mechanism to gradually synchronize the rotation speed of the fixing base 112 to the load connecting mechanism 40, so that the load connecting mechanism 40 finally rotates in synchronization with the rotation shaft 21. The buffering function provided by the delay synchronizer 110 reduces the demand on the output torque of the motor 10 and avoids the failure of the motor 10 to drive the load linkage 40.

When the rotation shaft 21 is stopped from the rotation state, the load connection mechanism 40 has a rotation speed greater than that of the rotation shaft 21 at an initial stage due to a large rotation inertia, and at this time, the end of the elastic member 119 close to the load connection mechanism is loosened to increase the inner diameter, and finally the entire elastic member 119 is loosened to increase the inner diameter, and in this process, the elastic member 119 also serves as a buffer member to suppress the rotation speed of the load connection mechanism 40 and to synchronize the load connection mechanism 40 with the rotation shaft 21.

To avoid the increase of the inner diameter of the elastic member 119 beyond a limit, a protective sleeve 117 may be added. A protective sleeve 117 surrounds the periphery of the elastic member 119 and serves to limit the maximum outer diameter of the elastic member 119, thereby preventing damage to the elastic member 119 beyond a limit during unscrewing. In this embodiment, the fixing base 112 includes, from bottom to top, a disc 114, a boss 116, and a hub 118; the disc 114 has a slightly larger diameter than the boss 116, the outer wall of the boss is slightly fitted with the inner wall of the protection sleeve 117, and the coil spring as the elastic member 119 is fitted over the boss 118. Of course, the elastic member 119 is not limited to the use of a coil spring. It will be appreciated that a buffer capable of synchronizing the rotational speeds of both the fixed seat 112 and the mounting portion 106, either buffered or delayed, may be used in place of the elastic member 119.

The buffering member 119 in the delay locked mechanism 110 may be deformed irreversibly during operation, and the one-way clutch mechanism 80 is received in the shaft hole 41 of the load connecting mechanism 40 and allows the load connecting mechanism 40 to rotate relative to the output shaft 21 along a first circumferential direction while limiting an angular range of the load connecting mechanism 40 to rotate relative to the output shaft 21 along a second, opposite circumferential direction, so that the one-way clutch mechanism 80 can reduce or even avoid the deformation of the buffering member 119.

Referring to fig. 1 and 3, the one-way clutch mechanism 80 includes a limiting groove 60 disposed on an inner wall of the shaft hole 41 and a locking member 50 mounted to the output shaft 21 and synchronously rotating with the output shaft 21. The limiting groove 60 includes a groove bottom 63, a first groove wall 61 and a second groove wall 62 respectively located at two sides of the groove bottom 63, in this embodiment, the first groove wall 61 is an arc surface and is smoothly connected with the inner wall of the shaft hole 41 along the first circumferential direction; the second groove wall 62 is a flat surface. The hook member 50 is restorably protruded from the outer circumferential surface of the output shaft 21 so as to enter the catching groove 60 through the second groove wall 62 and leave the catching groove 60 under the guidance of the first groove wall 61 when the motor output shaft 21 drives the load to operate (i.e., when the load connecting mechanism 40 rotates relative to the output shaft 21 in the first circumferential direction), and since the first groove wall guide surface provides a frictional force, the hook member 50 gradually transmits the rotational energy to the load to start the load to rotate, and enters the catching groove 60 through the first groove wall 61 and is caught by the second groove wall 62 when the load connecting mechanism 40 rotates relative to the output shaft 21 in the opposite second circumferential direction (i.e., the direction in which the load is rotated in reverse after the motor stops), so that the load (i.e., the load connecting mechanism 40) is interlocked (interlocking) with the motor shaft, and the total mass of the motor and the shaft consumes the remaining rotational kinetic energy stored in the load, thereby reducing the load rotation energy input into the spiral spring and avoiding the spring from excessively deforming and losing the function. In the present invention, n limiting grooves 60 are provided at intervals along the circumferential direction of the shaft hole 41 on the load connecting mechanism 40, where n is a natural number, for example, 2; the n clamping pieces 50 are arranged at intervals along the circumferential direction of the output shaft 21, and n is a natural number. And the number of the limiting grooves 60 can be the same as or different from that of the clamping pieces 50, for example, a plurality of grooves correspond to 1 elastic piece or 1 groove corresponds to a plurality of elastic pieces. In the embodiment shown in fig. 1, the latch 50 is a spring piece, one end of which is directly or indirectly connected to the surface of the output shaft 21, and the other end of which is tilted with respect to the surface of the output shaft 21. The number of the limiting grooves 60 can be the same as that of the clamping pieces 50, and is 2, and the number of the clamping pieces 50 can be 1, 3, 4 or more; also, the number of the retaining grooves 60 may be 1, 3, 4 or more, and the number of the retaining grooves 60 and the number of the clips 50 may be different.

As shown in fig. 4 and 5, the clip in this embodiment is also a spring piece, except that the spring piece 58 in this embodiment is disposed on the metal band 57, more specifically, the metal band 57 is tightly hooped on the output shaft 21, and a part of the metal band 57 is tilted to form the spring piece 58. The number of spring tabs 58 is 2 and the clips provided in this embodiment can cooperate with the load connection mechanism 40 provided in fig. 3, but can also cooperate with load connection mechanisms having 1, 3, 4 or more retaining grooves.

Referring to fig. 6, different from the previous embodiment, the number of the elastic pieces 58 in the present embodiment is 3, and the distance between two adjacent elastic pieces 58 may be the same or different. Although not shown in the drawings, the number of the elastic pieces 58 may be 1, 4, 5 or more, and the distance between two adjacent elastic pieces 58 may be freely set. It can be seen that the invention does not limit the number of the clips and the size of the space between every two adjacent clips. As in the previous embodiment, the spring plate of this embodiment may be coupled to the load coupling mechanism 40 provided in fig. 3, or may be coupled to a load coupling mechanism having 1, 3, 4 or more retaining grooves.

Referring to fig. 7, unlike the above-mentioned embodiment, the clip in this embodiment is a compression spring 53, and more specifically, the outer circumferential surface of the output shaft 21 is provided with a concave hole 31, and the compression spring 53 partially protrudes from the outer circumferential surface of the output shaft 21 in a free state. Although not shown in the drawings, the number of the compression springs 53 and the concave holes 31 may be 1, 4, 5 or more, and the distance between two adjacent concave holes 31 may be the same or different. As in the previous embodiment, the clip of this embodiment may cooperate with the load connection mechanism 40 provided in fig. 3, or with a load connection mechanism having 1, 3, 4 or more retaining grooves.

As shown in fig. 8, the escapement in the present embodiment is a cylinder 54 supported by a compression spring 52, more specifically, the outer peripheral surface of the output shaft 21 is provided with a concave hole 31, and the cylinder 54 supported by the compression spring 52 partially protrudes from the outer peripheral surface of the output shaft 21 in a free state of the compression spring 52. Although not shown in the drawings, the number of the columns 54 and the concave holes 31 supported by the compression springs 52 may be 1, 4, 5 or more, and the distance between two adjacent concave holes 31 may be the same or different. Although not shown in the drawings, the number of the elastic pieces 58 may be 1, 4, 5 or more, and the distance between two adjacent elastic pieces 58 may be freely set. As in the previous embodiment, the clip of this embodiment may cooperate with the load connection mechanism 40 provided in fig. 3, or with a load connection mechanism having 1, 3, 4 or more retaining grooves.

Referring to fig. 9, in the present embodiment, the number of the limiting grooves 60 is 3, the limiting grooves are spaced along the circumferential direction of the output shaft 21, and the spacing between two adjacent limiting grooves 60 is different. Although not shown, the number of the limiting grooves 60 may be 1 or 4 or more. It can be seen that the number of the limiting grooves 60 and the size of the space between every two limiting grooves 60 are not limited in the present invention. The load connection mechanism and the limiting groove on the load connection mechanism provided by the embodiment are also suitable for the clamping piece provided in fig. 1, 4, 6, 7 and 8.

Referring to fig. 10, fig. 10 is a schematic diagram of the working state of the driving assembly. In the states (a) to (c), the rotating shaft 21 starts to rotate and simultaneously drives the load connecting mechanism 40 to rotate, the elastic member 119 is screwed and the inner diameter is reduced until the inner diameter is not reduced any more, so that the load connecting mechanism 40 and the rotating shaft 21 rotate synchronously; in the state (d), the rotation shaft 21 stops rotating, and the load connecting mechanism 40 enters the freely rotating state from the internal rotational energy thereof, at this time, as shown in the state (e), the clip 50 enters the limiting groove 60 through the first groove wall 61 and is limited by the second groove wall 62, and finally, as shown in the state (f), the rotation shaft 21 reversely rotates along with the load connecting mechanism 40 until both stop rotating.

After the motor is powered off, the load coupling mechanism 40 rotates the shaft to reduce the rotational kinetic energy transferred to the delay locked mechanism 110. Specifically, in the absence of permanent deformation of the coil spring, the maximum energy of the object can be found to be

Where σ is the elastic limit pressure, E is the Young's modulus, A is the cross-sectional area, and L is the length of the object. In order to prevent the deformed coil spring from having residual kinetic energy when the motor stops driving the load connection mechanism 40, the following conditions are satisfied:

wherein

Is the rotational kinetic energy stored in the load connection mechanism 40, and w is the work performed by the load connection mechanism 40 to re-rotate the rotor after stopping rotation. It can be seen that when the fan is free-spinning, the motor rotor in the de-energized state is spun by the free-spinning fanMaximizing work may reduce the rotational kinetic energy transferred to the coil spring.

Referring to fig. 11 and 12, the motor 10 includes a stator and a permanent magnet rotor 20 rotatably mounted to the stator. The stator includes a stator core 31, an insulating bobbin 35 attached to the stator core 31, and a stator winding 32 wound around the stator core 31 via the insulating bobbin 35. The stator core 31 includes a square yoke 33, salient poles 36 protruding inward from two inner walls of the square yoke 33, and each salient pole 36 has a winding portion 38 for mounting the stator winding 32, and curved pole pieces 49 protruding from the radially inner ends of the winding portion 38 to both sides in the circumferential direction. In the embodiment, the outer end of the salient pole 36 in the radial direction and the inner wall of the square yoke part 33 are provided with a concave-convex buckle structure 39; specifically, the male-female snap structure 39 includes a dovetail 37 provided at the radially outer end of the salient pole 36 and a dovetail groove 34 provided at the inner wall of the square yoke 33 to match the dovetail 37.

The pole shoes 49 of the two salient poles 36 enclose a cavity similar to a cylinder, and the permanent magnet rotor 20 is accommodated in the cavity; in addition, a positioning groove 46 is arranged on the inner wall of the cylindrical cavity along the axial direction of the motor, preferably, the positioning groove 46 is arranged at the central position of each pole shoe 49, and the motor designed in such a way is suitable for the bidirectional starting of the rotor. Referring to fig. 10, the permanent magnet rotor 20 includes a rotating shaft 21 and a rotor body fixedly sleeved on the rotating shaft 21. The rotor body includes permanent magnet poles 25 made of permanent magnets, and optionally, the rotor body includes a rotor core fixedly fitted to the rotating shaft 21 and the permanent magnet poles 25 mounted to the rotor core. The outer side surface of each permanent magnet pole 25 is a cambered surface. Preferably, an air gap 47 of non-uniform thickness is formed between the permanent magnet pole 25 and the pole piece 49. In this embodiment, a notch 43 with a large magnetic resistance is formed between the pole pieces 49 of the two salient poles 36, and the notch 43 may be replaced by a magnetic bridge. The air gap 47 has a maximum thickness at the slot/bridge 43, the thickness of the air gap 47 decreasing in a direction away from the slot/bridge 43. Preferably, the thickness of the air gap 47 is symmetrical about a center line of the stator salient poles 36, thereby forming a symmetrical non-uniform air gap. The non-uniform air gap arrangement can reduce the cogging torque of the motor and improve the noise. The positioning groove 46 is provided such that the permanent magnet rotor 20 is offset by a fixed angle with respect to the pole axis of the stator when at rest, thereby ensuring that the permanent magnet rotor 20 has a fixed starting direction each time the stator windings 32 are energized.

In this embodiment, the rotating shaft 21 is fixed/rigidly connected to the rotor body so as to be capable of synchronous rotation, and the rotating shaft 21 is slidably/flexibly connected to the load connecting mechanism 40 so as to allow relative rotation. The permanent magnet poles 25 in the rotor 20 are formed by at least one permanent magnet, and the rotor 20 is operated at a constant speed of 60f/p turns/min in a steady state stage when the stator winding 32 is connected in series with an alternating current power supply, wherein f is the frequency of the alternating current power supply and p is the number of pole pairs of the rotor. In fig. 5 both the stator and the rotor have two poles. It will be appreciated that in further embodiments, the stator and rotor may have more poles, for example four, six, etc.

In this embodiment, the square yoke portion 33 of the stator core 31 is rectangular, and has two longer sides and two shorter sides. The two salient poles 36 are connected to the two shorter sides, respectively, so that the length of the salient poles 36 can be made longer, thereby enabling larger stator windings 32 to be mounted. It is to be understood that the yoke portion of the stator core 31 is not limited to a square shape, but may be a ring shape, a U shape, or the like.

The top cover 13 and the bottom cover 17 of the motor housing have substantially the same structure. The bottom cover 17 is described as an example. The bottom cover 17 has a generally square cap shape with an internal cavity 81, and the internal wall of the cavity 81 has an annularly closed step 83 so that the cavity 81 has a larger dimension at the opening of the bottom cover 17 and a smaller dimension near the bottom of the bottom cover 17. The annular step 83 supports the axial end face of the square yoke portion 33 of the stator core 31. The inner wall 87 of the inner cavity 81 close to the opening of the bottom cover 17 is further provided with a plurality of projections 88, specifically, the plurality of projections 88 are arranged above the annular step 83, and when the stator core 31 is assembled, the plurality of projections 88 abut against the outer peripheral surface of the square yoke portion 33 of the stator core 31, so that the stator core 31 is stably installed in the shell formed by the top cover 13 and the bottom cover 17. The motor 10 of the present invention is a single-phase permanent magnet brushless ac motor, such as a single-phase synchronous motor, where ac means that the current flowing through the stator coils of the motor is ac.

Fig. 13 shows a block diagram of the motor drive circuit of the present invention. In the drive circuit 70, the stator winding 51 of the motor 10 and the ac power source 72 are connected in series between two nodes A, B. The ac power source 72 is preferably a mains ac power source, and the current voltage may be, for example, 110 volts, 220 volts, 230 volts, etc. The motor 10 is a synchronous motor, and its input power is set to 2W to 5W, for example, 3W; the current is 0.08A to 0.12A, for example 0.09A, and the controllable bidirectional ac switch 74 is connected in parallel with the stator windings 51 and the ac power source 72 in series between two nodes A, B. The controllable bidirectional ac switch 74 is preferably a TRIAC (TRIAC), and its two anodes are connected to the two nodes a and B, respectively. It will be appreciated that the controllable bidirectional ac switch 74 may also be implemented, for example, by two thyristors connected in anti-parallel, and corresponding control circuitry arranged to control the two thyristors in a predetermined manner. The ac-dc converter circuit 76 and the switch 74 are connected in parallel between two nodes A, B. The ac-dc converter circuit 76 converts the ac power between the two nodes A, B to low voltage dc power. The position sensor 78 may be powered by the low-voltage dc output from the ac-dc conversion circuit 76 for detecting the magnetic pole position of the permanent magnet rotor 20 of the synchronous motor 10 and outputting a corresponding signal. In particular implementations, the position sensor 78 may be a hall effect sensor disposed on or within the stator proximate the rotor; and the position sensor 78 is offset from the pole axis of the stator by an angle that may be the same as the angle by which the pole axis of the rotor is offset from the pole axis of the stator when at rest.

The switch control circuit 79 is connected to the ac-dc conversion circuit 76, the position sensor 78 and the controllable bidirectional ac switch 74, and is configured to control the controllable bidirectional ac switch 74 to switch between on and off states in a predetermined manner according to the magnetic pole position information of the permanent magnet rotor detected by the position sensor 78 and the polarity information of the ac power source 72 acquired from the ac-dc conversion circuit 76, so that the stator winding 51 drags the permanent magnet rotor 20 to rotate only in the aforementioned fixed starting direction during the motor starting phase. In the present invention, when the controllable bidirectional ac switch 74 is turned on, the two nodes A, B are short-circuited, and the ac-dc converter circuit 76 consumes no more power because no current flows, thereby greatly improving the efficiency of power utilization.

As shown in fig. 14 and 15, the present invention further provides a fan 200, which includes the above-mentioned driving component and a fan blade 210, wherein the fan blade 210 includes a hub portion 104 and a plurality of blades 102 connected to the hub portion 104, and the hub portion 104 of the fan blade is used as a load connection mechanism of the above-mentioned driving component.

The invention also provides a pump, which comprises the driving assembly and the impeller, wherein the impeller comprises a hub part and a plurality of blades connected to the hub part, and the hub part of the impeller is used as a load connecting mechanism of the driving assembly.

The invention provides a driving assembly and electrical equipment applying the same, and the problem of difficult starting of a single-phase motor is solved through the arrangement of a one-way clutch mechanism and a delay synchronization mechanism; meanwhile, the one-way clutch mechanism can prevent the buffer part in the delay synchronizing mechanism from deforming, so that the normal operation of the buffer part is ensured, and the service life of the delay synchronizing mechanism is prolonged.

While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, those skilled in the art will appreciate that various modifications can be made to the present invention without departing from the scope and spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.

Claims

1. A drive assembly, comprising:

a motor having an output shaft;

a load connection mechanism rotatably fitted to the output shaft;

the delay synchronization mechanism comprises a buffer piece, and two ends of the buffer piece are respectively connected to the output shaft and the load connection mechanism so as to delay and synchronize the rotating speeds of the output shaft and the load connection mechanism;

a one-way clutch mechanism connected between the output shaft and the load connection mechanism, the one-way clutch mechanism allowing rotation of the load connection mechanism relative to the output shaft in a first circumferential direction and limiting a range of angles of rotation of the load connection mechanism relative to the output shaft in an opposite second circumferential direction,

the load connecting mechanism is provided with a shaft hole to be rotatably sleeved on the output shaft, the one-way clutch mechanism comprises a limiting groove arranged on the inner wall of the shaft hole and a plurality of clamping pieces which are arranged on the output shaft and synchronously rotate along with the output shaft, and the clamping pieces can protrude out of the outer peripheral surface of the output shaft in a resetting manner.

2. The drive assembly of claim 1, wherein the buffer is a coil spring sleeved to the output shaft.

3. The drive assembly of claim 1, wherein the dogs exit the limit grooves when the load coupling rotates in a first circumferential direction relative to the output shaft and enter the limit grooves and are limited to interlock the load coupling with the motor shaft when the load coupling rotates in a second, opposite circumferential direction relative to the output shaft.

4. The drive assembly of claim 1, wherein the limit groove of the one-way clutch mechanism includes a groove bottom, a first groove wall for providing a sliding surface and a second groove wall for providing an interlocking surface, which are respectively located at both sides of the groove bottom;

the clamping piece can enter the limiting groove through the second groove wall and leave the limiting groove under the guidance of the first groove wall when the load connecting mechanism rotates relative to the output shaft along a first circumferential direction, and enters the limiting groove through the first groove wall and is limited by the second groove wall when the load connecting mechanism rotates relative to the output shaft along a second opposite circumferential direction, so that the load connecting mechanism is interlocked with the motor shaft.

5. The drive assembly of claim 4, wherein the catch is a resilient tab having one end directly or indirectly connected to the surface of the output shaft and another end tilted with respect to the surface of the output shaft.

6. The drive assembly according to claim 4, wherein the outer peripheral surface of the output shaft is provided with a recess, and the catch is a compression spring fitted into the recess, the compression spring partially protruding from the outer peripheral surface of the output shaft in a free state.

7. The drive assembly according to claim 4, wherein the outer peripheral surface of the output shaft is provided with a recess in which a compression spring is mounted, and the catch is a cylinder mounted to and supported by the recess, the cylinder partially protruding from the outer peripheral surface of the output shaft in a free state of the compression spring.

8. The drive assembly according to claim 4, wherein the number of the limiting grooves is n, and the n limiting grooves are arranged at intervals along the circumferential direction of the shaft hole, wherein n is a natural number.

9. The drive assembly of claim 4, wherein the number of the catches is n, and the n is a natural number, and the n is arranged at intervals along the circumferential direction of the output shaft.

10. The drive assembly as set forth in claim 5 wherein said one-way clutch mechanism comprises a metal band tightened to said output shaft, a portion of said metal band being turned up to form said leaf spring.

11. The drive assembly of claim 4,

the first groove wall is an arc surface; and/or

The second groove wall is a plane.

12. The drive assembly of claim 1, wherein the load connection mechanism is a fan blade or a hub of a fan blade.

13. The drive assembly of claim 1, wherein the motor is a single-phase brushless motor.

14. The drive assembly of claim 13, wherein the motor includes a stator and a permanent magnet rotor rotatable relative to the stator, the permanent magnet rotor including a rotor body surrounding the output shaft, the stator including a stator core and a stator winding wound around the stator core and powered by an ac power source, the rotor body having a predetermined starting direction and operating at a constant speed of 60f/p turns/minute during a steady state period each time the motor is energized, wherein f is a frequency of the ac power source and p is a number of pole pairs of the permanent magnet rotor.

15. An electrical device comprising a fan blade or impeller comprising a hub and a plurality of blades connected to the hub, characterised by further comprising a drive assembly as claimed in any one of claims 1 to 14, the hub of the fan blade or impeller acting as a load connection for the drive assembly.

16. The electrical device of claim 15, wherein the electrical device is a fan or a pump.