CN214256020U - Speed regulating motor - Google Patents

Abstract

The utility model relates to a speed regulating motor, which comprises a housing, a stator, rotor and actuator, the stator is located in the casing along endwise slip, the stator includes the tube-shape body and sets up the end cover in tube-shape body one end, the rotor rotates and locates the tube-shape body internal, the end cover is connected to the actuator, and be used for driving stator along axial displacement, the rotor includes the motor shaft, the front end of motor shaft is the output, end cover and casing are run through to the rear end of motor shaft, the rear end coaxial coupling of motor shaft has the flabellum, still be equipped with speed regulating mechanism between motor shaft and the flabellum, speed regulating mechanism is used for adjusting the drive ratio between flabellum and the motor shaft. The utility model discloses after having the weak magnetic speed governing of motor, the drive ratio between speed governing mechanism increase flabellum and the motor shaft for the flabellum rotates with faster rotational speed, and then accelerates the air flow rate of motor week side, realizes strengthening the holistic radiating efficiency of motor, with the heat dissipation demand that satisfies the stator, and then guarantees the effect of the holistic life of motor and reliability.

Description

Speed regulating motor

Technical Field

The utility model belongs to the technical field of the technique of motor and specifically relates to an adjustable speed motor is related to.

Background

An Electric machine (also known as "motor") refers to an electromagnetic device that converts or transmits Electric energy according to the law of electromagnetic induction. The motor is represented by a letter M (old standard is represented by D) in a circuit, and the motor mainly plays a role in generating driving torque and serving as a power source of electrical appliances or various machines (actuating mechanisms).

The speed regulating motor is a motor which changes the rotating speed of the motor by changing the number of stages, voltage, current, frequency and the like of the motor so as to enable the motor to achieve higher service performance, and the existing speed regulating methods of the speed regulating motor are generally as follows:

firstly, the method comprises the following steps: voltage and speed regulation, namely, the speed regulation is realized by changing the voltage of a stator of the motor through a voltage regulating transformer, if the voltage regulation of the transformer is staged, the speed regulation of the motor is staged, if the voltage regulation of the transformer is stepless, the speed regulation of the motor is also stepless, the power factor of the voltage and speed regulation is lower, harmonic interference exists, and no braking torque exists during normal operation;

II, secondly: pole-changing speed regulation, namely changing the magnetic pole number of pairs of the motor by changing the wiring mode of the stator winding of the motor, thereby changing the synchronous rotating speed step by step and realizing the step speed regulation of the rotating speed of the motor, wherein the speed regulating motor can not realize stepless smooth speed regulation;

thirdly, the method comprises the following steps: the flux-weakening speed regulation means that in the speed regulation of the frequency converter to the asynchronous motor, when the output frequency of the frequency converter is higher than the rated frequency of the motor, the magnetic flux of the iron core of the motor begins to weaken, so that the rotating speed of the motor is higher than the rated rotating speed. In addition, except for using a frequency converter to change the magnetic flux of a motor core to realize weak magnetic speed regulation, some motors carry out weak magnetic speed regulation in a mode of driving a stator to translate along the axial direction so as to enable the stator to be staggered with a rotor.

The chinese patent with CN106300796B discloses a speed-adjustable motor, which includes a stator, a rotor, a movable shaft, a driver, a controller and a speed measuring device.

The stator and the rotor are arranged correspondingly, the stator is connected with one end of a moving shaft, the moving shaft is arranged on a driver and moves along the axial direction of the driver under the driving of the driver, the controller is connected with the driver, one end of a speed measuring device is connected with the rotor, and the other end of the speed measuring device is connected with the controller;

the driver comprises a transmission mechanism and parallel guide rails, the parallel guide rails are independent of the transmission mechanism and a stator, the moving shaft comprises a horizontal section and a bending section which are integrally formed, the end part of the horizontal section is connected with the stator, the transmission mechanism is connected with the bending section of the moving shaft to drive the moving shaft to move along the axial direction of the horizontal section, and the lower end of the bending section of the moving shaft is embedded between the parallel guide rails and moves between the parallel guide rails.

Under the control of the controller, the driver drives the moving shaft to move axially, so as to drive the stator to move axially along the moving shaft, the relative positions of the rotor and the stator on the axis are adjusted, the electromagnetic power transmitted to the rotor side by the stator magnetic field is changed, the size of the electromagnetic torque on the rotor side is adjusted, the change of the rotating speed is realized, and the purpose of regulating the speed of the motor is achieved. And the speed measuring device feeds back the rotating speed information of the rotor to the controller to guide the controller to regulate the speed.

The above prior art solutions have the following drawbacks: when the mode is adopted for carrying out flux weakening speed regulation, after the motor stator moves in the shell, the heat dissipation condition of the motor stator changes, and if the heat dissipation condition is poor, the heat dissipation of the stator is affected, and the service life and the reliability of the whole motor are affected finally.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art existence, one of the purposes of the utility model is to provide an adjustable speed motor, when the motor carries out the weak magnetism speed governing, driver drive stator is along axial displacement for the heat dissipation condition variation of stator, at this moment, increase the drive ratio between flabellum and the motor shaft, make the flabellum rotate with faster rotational speed, and then the air flow rate of motor week side with higher speed, realize strengthening the holistic radiating efficiency of motor, in order to satisfy the heat dissipation demand of stator, and then guarantee the holistic life and the reliability of motor.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides an adjustable speed motor, includes casing, stator, rotor and driver, the stator is located in the casing along endwise slip, the stator includes the tube-shape body and sets up the end cover in tube-shape body one end, it is internal that the tube-shape body is located in the rotor rotation, the end cover is connected to the driver to be used for driving the stator along endwise displacement, the rotor includes the motor shaft, the front end of motor shaft is the output, end cover and casing are run through to the rear end of motor shaft, the rear end coaxial coupling of motor shaft has the flabellum, still be equipped with speed governing mechanism between motor shaft and the flabellum, speed governing mechanism is used for adjusting the drive ratio between flabellum and the motor shaft.

Through adopting above-mentioned technical scheme, when the motor carries out the weak magnetism speed governing, driver drive stator is along axial displacement for the heat dissipation condition variation of stator, at this moment, speed adjusting mechanism increase the drive ratio between flabellum and the motor shaft for the flabellum rotates with faster rotational speed, and then accelerates motor week side air flow rate, realizes strengthening the holistic radiating efficiency of motor, in order to satisfy the heat dissipation demand of stator, and then guarantees holistic life and the reliability of motor.

The present invention may be further configured in a preferred embodiment as: the speed regulating mechanism comprises a transmission assembly and an adjusting assembly, the transmission assembly comprises a sun wheel, a planet carrier and a gear ring, the planet carrier is connected with the motor shaft, the sun wheel is connected with the fan blades, the gear ring is located between the fan blades and the casing, the adjusting assembly is used for driving the gear ring to move along the axis, and the gear ring is abutted against the fan blades or the casing.

By adopting the technical scheme, the heat dissipation condition of the stator is good before the flux weakening speed regulation, at the moment, the regulating assembly drives the gear ring to tightly abut against the fan blades, the gear ring rotates synchronously and at a constant speed along with the fan blades, the sun gear and the gear ring rotate synchronously and at a constant speed, and finally the planet carrier and the sun gear rotate synchronously and at a constant speed, namely the rotating speed of the fan blades is equal to that of the motor shaft, so that the heat dissipation requirement of the stator can be met;

after the weak magnetism speed governing, stator heat dissipation condition variation, at this moment, adjusting part drive ring gear supports tight casing, realizes fixed ring gear, at this moment, the drive ratio between sun gear and the planet carrier support is greater than 1, the rotational speed of flabellum is greater than the rotational speed of motor shaft promptly, make the flabellum rotate with faster rotational speed, and then the air flow rate of motor week side accelerates, realize strengthening the holistic radiating efficiency of motor, in order to satisfy the heat dissipation demand of stator, and then guarantee the holistic life and the reliability of motor.

The present invention may be further configured in a preferred embodiment as: the periphery of ring gear is equipped with the annular, adjusting part includes lead screw, slide and becket, lead screw parallel motor shaft, the slide cup joints on the lead screw to constitute the lead screw pair, the becket sets up with the coaxial rotation of ring gear, just the becket rotates to inlay and locates in the annular, the slide is used for driving the becket and follows axial displacement.

By adopting the technical scheme, the sliding seat is driven to move axially along the motor shaft by rotating the screw rod, and the embedded ring is driven to move axially, so that the gear ring is driven to move axially, and the adjustment is completed.

The present invention may be further configured in a preferred embodiment as: the annular is coaxial to be inlayed and to be equipped with the clamping ring, just the clamping ring is located one side that the abaculus deviates from the casing, be equipped with compression spring in the annular, compression spring makes the clamping ring support tight abaculus ring, and makes the abaculus ring supports the lateral wall of tight annular towards the one end of casing.

By adopting the technical scheme, when a space exists between the end part of the gear ring and the fan blade, the compression spring drives the pressing ring to abut against the embedded ring, so that the embedded ring abuts against the gear ring, at the moment, the friction force between the embedded ring and the gear ring can be utilized to finish the fixation between the gear ring and the casing, and the rotating speed of the fan blade is larger than that of the motor shaft;

when the ring gear is driven by the embedded ring to tightly abut against the fan blades, the embedded ring overcomes the elastic force of the compression spring, one end of the embedded ring pushes the pressing ring to move, the other end of the embedded ring is separated from the side wall of the ring groove, at the moment, the ring gear tightly abuts against the fan blades, the ring gear synchronously rotates along with the fan blades, and namely the rotation of the fan blades is equal to the rotation speed of the motor shaft.

The present invention may be further configured in a preferred embodiment as: the one end that the abaculus deviates from the casing is equipped with the ball along its circumference interval, the periphery roll butt clamping ring of ball.

Through adopting above-mentioned technical scheme, utilize the roll of ball, reduce the frictional force between caulking ring and the clamping ring, the ring gear of being convenient for rotates along with the flabellum.

The present invention may be further configured in a preferred embodiment as: the driver is used for driving the screw rod to rotate, one end of the screw rod extends into the shell, a sleeve is further arranged on the end cover, the sleeve is sleeved with the end portion of the screw rod, and a distance exists between the end portion of the screw rod and the end face of the end cover.

By adopting the technical scheme, during the field weakening speed regulation, the driver drives the screw rod to rotate, so as to drive the sleeve to slide along the axial direction, and the stator is driven to slide along the axial direction, meanwhile, the rotating screw rod drives the sliding seat to move along the axial direction, so that the axial position of the gear ring is adjusted, and further, the position of the gear ring is automatically adjusted along with the movement of the stator, so that the transmission ratio between the fan blade and the motor shaft is adjusted.

The present invention may be further configured in a preferred embodiment as: the novel telescopic clamping device is characterized in that a clamping groove is formed in the sliding seat, a guide rod is arranged in the clamping groove, the guide rod is parallel to the lead screw, an ear plate is arranged on the periphery of the embedding ring, the ear plate is embedded into the clamping groove and is sleeved on the guide rod in a sliding mode, telescopic springs are arranged in the clamping groove and on two sides of the ear plate, and two ends of each telescopic spring are respectively abutted against the side walls of the ear plate and the clamping groove.

Through adopting above-mentioned technical scheme, the otic placode slides and cup joints on the guide arm, avoids slide self to rotate along with the lead screw, and simultaneously, during ring gear butt casing or flabellum, the axial position of caulking ring is fixed, at this moment, utilizes compression spring for the slide has certain axial displacement free quantity, and this free quantity is used for satisfying the lead screw and rotates with drive stator axial displacement, and then accomplishes the weak magnetism speed governing of motor.

The present invention may be further configured in a preferred embodiment as: the both ends of ring gear all are equipped with friction parts, two friction parts are used for butt flabellum, casing respectively.

By adopting the technical scheme, the friction force between the gear ring and the fan blades and between the gear ring and the casing is increased by utilizing the friction piece, so that the gear ring can synchronously rotate at a constant speed along with the fan blades, or the gear ring is fixed along with the casing.

To sum up, the utility model discloses a following at least one useful technological effect:

when the motor carries out weak magnetic speed regulation, the driver drives the stator to move along the axial direction, so that the heat dissipation condition of the stator is poor, at the moment, the transmission ratio between the fan blades and the motor shaft is increased, the fan blades rotate at a higher rotating speed, the air flow rate of the peripheral side of the motor is further accelerated, the heat dissipation efficiency of the whole motor is enhanced, the heat dissipation requirement of the stator is met, and the service life and the reliability of the whole motor are further ensured;

before the flux weakening speed regulation, the heat dissipation condition of the stator is good, at the moment, the adjusting assembly drives the gear ring to tightly abut against the fan blades, the gear ring rotates synchronously and at a constant speed along with the fan blades, the sun gear and the gear ring rotate synchronously and at a constant speed, and finally the planet carrier and the sun gear rotate synchronously and at a constant speed, namely the rotating speed of the fan blades is equal to that of a motor shaft, so that the heat dissipation requirement of the stator can be met;

after the weak magnetism speed governing, stator heat dissipation condition variation, at this moment, adjusting part drive ring gear supports tight casing, realizes fixed ring gear, and at this moment, the drive ratio between sun gear and the planet carrier support is greater than 1, and the rotational speed of flabellum is greater than the rotational speed of motor shaft promptly for the flabellum rotates with faster rotational speed, and then accelerates the air flow rate of motor week side, realizes strengthening the holistic radiating efficiency of motor, in order to satisfy the heat dissipation demand of stator.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a schematic diagram of the explosion structure of the present invention.

Fig. 4 is a partially enlarged schematic view of a portion B in fig. 3.

Fig. 5 is a partially enlarged schematic view of a portion C in fig. 3.

Fig. 6 is a sectional view of the governor mechanism.

Fig. 7 is a partially enlarged schematic view of a portion D in fig. 6.

In the figure, 1, a housing; 2. a stator; 21. a cylindrical body; 22. an end cap; 221. a sleeve; 3. a rotor; 31. a motor shaft; 4. a rear cover; 5. a fan blade; 6. a screw rod; 7. a driver; 8. a speed regulating mechanism; 81. a transmission assembly; 811. a sun gear; 812. a planet wheel; 813. a planet carrier; 814. a ring gear; 815. a friction member; 816. a ring groove; 82. an adjustment assembly; 821. embedding a ring; 8211. an ear plate; 8212. a ball bearing; 822. a slide base; 8221. a card slot; 8222. a guide bar; 8223. a tension spring; 823. pressing a ring; 824. compressing the spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the utility model discloses an adjustable speed motor, including casing 1, stator 2 and rotor 3. The stator 2 comprises a cylindrical body 21 and an end cover 22, the end cover 22 is coaxially connected to the rear end of the cylindrical body 21, the rotor 3 is rotatably arranged in the cylindrical body 21, a motor shaft 31 is coaxially arranged on the rotor 3, the front end of the motor shaft 31 is an output end, and the motor shaft 31 sequentially extends out of the cylindrical body 21 and the casing 1 to be connected with an actuating mechanism and outputs torque so as to drive the actuating mechanism to act.

Referring to fig. 2 and 3, the rear end of the motor shaft 31 sequentially penetrates through the end cover 22 and the rear end of the housing 1, the rear end of the housing 1 is further provided with a rear cover 4, the fan blades 5 are rotatably arranged in the rear cover 4, the fan blades 5 are coaxially connected to the motor shaft 31, when the motor operates, the motor shaft 31 drives the fan blades 5 to rotate, and the rotating fan blades 5 forcibly accelerate the flow of air to achieve auxiliary heat dissipation.

The casing 1 is provided with a screw rod 6 in a rotating manner, a shaft 31 parallel to the screw rod 6 is provided with a sleeve 221, the sleeve 221 is sleeved on the screw rod 6 and forms a screw rod pair, a distance exists between the end part of the screw rod 6 and the end cover 22, the screw rod 6 is rotated, the sleeve 221 slides along the axial direction of the motor, the sleeve 22 is further provided with an end cover 22, the stator 2 is driven to move along the axial direction, at the moment, the relative position of the stator 2 and the rotor 3 is changed, the electromagnetic power of the stator 2 in a magnetic field transmission mode to the rotor 3 side is further changed, the electromagnetic torque of the rotor 3 side is adjusted, the change of the rotating speed is realized, and the purpose of weak magnetic speed regulation of the motor is achieved.

Referring to fig. 4, the casing 1 is further provided with an actuator 7, the actuator 7 is used for driving the screw rod 6 to rotate, in this embodiment, the actuator 7 is a stepping motor, and power transmission is completed between the stepping motor and the screw rod 6 through a pair of gears which are externally meshed.

However, when the speed is adjusted by the weak magnetism, the stator 2 of the motor moves in the casing 1, the heat dissipation condition of the stator 2 becomes worse, and the service life and the reliability of the motor are affected.

Referring to fig. 2, a speed adjusting mechanism 8 is disposed between the motor shaft 31 and the fan blade 5 to adjust the transmission ratio between the fan blade 5 and the motor shaft 31.

Referring to fig. 3, the speed adjusting mechanism 8 includes a transmission assembly 81 and an adjusting assembly 82, the transmission assembly 81 includes a sun gear 811, a planet gear 812, a planet carrier 813 and a ring gear 814, the planet carrier 813 is connected to the motor shaft 31, the sun gear 811 is connected to the fan blade 5, the ring gear 814 is located between the fan blade 5 and the housing 1, the adjusting assembly 82 is configured to drive the ring gear 814 to move along the axis, and the ring gear 814 abuts against the fan blade 5 or the housing 1, referring to fig. 5, friction members 815 are respectively disposed at two ends of the ring gear 814 to increase friction between the ring gear 814 and the fan blade 5 and between the ring gear 814 and the housing 1.

Before flux weakening and speed regulation, the heat dissipation condition of the stator 2 is good, at the moment, the adjusting component 82 drives the gear ring 814 to tightly abut against the fan blade 5, and the gear ring 814 rotates synchronously and at a constant speed along with the fan blade 5 through the friction piece 815, so that the sun gear 811 and the gear ring 814 rotate synchronously and at a constant speed, and finally the synchronous and constant-speed rotation of the planet carrier 813 and the sun gear 811 is realized, namely the rotating speed of the fan blade 5 is equal to that of the motor shaft 31, so that the heat dissipation requirement of the stator 2 can be met;

after the weak magnetism speed governing, stator 2 heat dissipation condition variation, at this moment, adjusting part 82 drives ring gear 814 and supports tight casing 1, and realize fixed ring gear 814 through another friction member 815, at this moment, the drive ratio between sun gear 811 and the planet carrier 813 support is greater than 1, the rotational speed of flabellum 5 is greater than the rotational speed of motor shaft 31 promptly, make flabellum 5 rotate with faster rotational speed, and then the air flow rate of motor week side is accelerated, realize strengthening the holistic radiating efficiency of motor, in order to satisfy stator 2's heat dissipation demand, and then guarantee the holistic life and the reliability of motor.

Referring to fig. 3 and 5, the adjusting assembly 82 includes an insert ring 821 and a sliding seat 822, a ring groove 816 is disposed on the periphery of the gear ring 814, the insert ring 821 is rotatably embedded in the ring groove 816, an ear plate 8211 is disposed on the outer side of the insert ring 821, the sliding seat 822 is connected to the ear plate 8211, the sliding seat 822 is sleeved on the lead screw 6 and forms a lead screw pair, a slot 8221 is disposed on the sliding seat 822, a guide rod 8222 is disposed in the slot 8221, the guide rod 8222 is parallel to the lead screw 6, the ear plate 8211 is embedded in the slot 8221 and is sleeved on the guide rod 8222 in a sliding manner, expansion springs 8223 are disposed on the guide rod 8222 and on two sides of the ear plate 8211, and two ends of the expansion springs 8223 respectively abut against side walls of the ear plate 8211 and the slot 8221.

During the field weakening speed governing, driver 7 drive lead screw 6 rotates, and then makes stator 2 along axial displacement, and simultaneously, slide 822 along axial displacement, and then drives insert ring 821 along axial displacement, with the removal of drive ring gear 814, and make ring gear 814 support tight casing 1, compression spring 824 this moment for slide 822 has certain axial displacement free amount, and this free amount is used for satisfying lead screw 6 and rotates in order to continue drive stator 2 axial displacement, and then accomplishes the field weakening speed governing of motor.

And when the driver 7 drives the screw rod 6 to rotate, the moving directions of the stator 2 and the sliding seat 822 are as follows: the screw threads at the two ends of the screw rod 6 can be the same, namely the screw threads at the two ends of the screw rod are the same in the rotating direction; the thread directions of the two ends of the screw rod 6 can be opposite.

Referring to fig. 5, a pressing ring 823 and a compression spring 824 are further coaxially embedded in the ring groove 816 of the gear ring 814, the pressing ring 823 is located on one side, away from the casing 1, of the insert ring 821, the compression spring 824 enables the pressing ring 823 to abut against the insert ring 821, the insert ring 821 abuts against the side wall of the ring groove 816, balls 8212 are arranged between the insert ring 821 and the pressing ring 823 along the circumferential direction at intervals, and the periphery of the balls 8212 abuts against the pressing ring 823 in a rolling mode.

Referring to fig. 6 and 7, before the field weakening speed regulation, the gear ring 814/friction member 815 abuts against the fan blade 5, at this time, the sliding seat 822 is far away from the casing 1, the insert ring 821 abuts against the compression ring 823, and overcomes the elastic force of compression, so that the insert ring 821 is far away from the side wall of the ring groove 816, the gear ring 814 rotates along with the fan blade 5, and the fan blade 5 and the motor shaft 31 rotate at a constant speed;

when the flux is weakened for speed regulation, the driver 7 drives the screw 6 to rotate, the sliding seat 822 gradually approaches to the casing 1, at this time, the insert ring 821 gradually approaches to the casing 1, and under the pushing of the compression spring 824 and the compression ring 823, the insert ring 821 abuts against the side wall of the ring groove 816, so that the ring groove 816, the insert ring 821, the lug plate 8211, the guide rod 8222, the sliding seat 822 and the screw 6 are used for circumferentially fixing the gear ring 814 and the casing 1, and the fan blade 5 rotates at a faster rotating speed,

subsequently, the driver 7 continues to drive the screw 6 to rotate, the gear ring 814/friction member 815 abuts against the casing 1, and circumferential fixation between the gear ring 814 and the casing 1 is completed, so that the fan blades 5 rotate at a faster rotating speed.

The implementation principle of the embodiment is as follows: before the flux weakening speed regulation, the adjusting component 82 enables the gear ring 814/the friction part 815 to tightly abut against the fan blade 5, so that the gear ring 814 rotates along with the fan blade 5, the fan blade 5 and the motor shaft 31 rotate at the same speed, and the heat dissipation requirement of the stator 2 is met;

when the magnetic flux is weakened to regulate speed, the ring gear 814 and the machine shell 1 are circumferentially fixed through the ring groove 816, the insert ring 821, the lug plate 8211, the guide rod 8222, the sliding seat 822 and the screw rod 6, so that the fan blades 5 can rotate at a higher rotating speed; after the field weakening speed regulation, gear ring 814/friction member 815 supports tightly casing 1 to accomplish the circumference between gear ring 814 and the casing 1 fixed, realize that flabellum 5 rotates with faster rotational speed, and then the air flow rate of motor week side is accelerated, realize strengthening the holistic radiating efficiency of motor, in order to satisfy stator 2's heat dissipation demand, and then guarantee holistic life and the reliability of motor.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a speed regulating motor, includes casing (1), stator (2), rotor (3) and driver (7), stator (2) are located casing (1) along axial slip, stator (2) include tube-shape body (21) and set up end cover (22) in tube-shape body (21) one end, rotor (3) are rotated and are located in tube-shape body (21), end cover (22) are connected in driver (7) for drive stator (2) are along axial displacement, its characterized in that: the rotor (3) includes motor shaft (31), the front end of motor shaft (31) is the output, end cover (22) and casing (1) are run through to the rear end of motor shaft (31), the rear end coaxial coupling of motor shaft (31) has flabellum (5), still be equipped with speed adjusting mechanism (8) between motor shaft (31) and flabellum (5), speed adjusting mechanism (8) are used for adjusting the drive ratio between flabellum (5) and motor shaft (31).

2. An adjustable speed motor according to claim 1, wherein: speed adjusting mechanism (8) are including drive assembly (81) and adjusting part (82), drive assembly (81) are including sun gear (811), planet wheel (812), planet carrier (813) and ring gear (814), motor shaft (31) is connected in planet carrier (813), fan blade (5) are connected in sun gear (811), ring gear (814) are located between fan blade (5) and casing (1), just adjusting part (82) are used for driving ring gear (814) to remove along the axis, and make ring gear (814) support tight fan blade (5) or casing (1).

3. An adjustable speed motor according to claim 2, wherein: the periphery of ring gear (814) is equipped with annular (816), adjusting part (82) include lead screw (6), slide (822) and becket (821), lead screw (6) parallel motor axle (31), slide (822) cup joint on lead screw (6) to constitute the lead screw pair, becket (821) and ring gear (814) coaxial rotation setting, just becket (821) rotate to inlay and locate in annular (816), slide (822) are used for driving becket (821) along axial displacement.

4. An adjustable speed motor according to claim 3, wherein: coaxial embedding is equipped with clamping ring (823) in annular (816), just clamping ring (823) is located one side that abaculus (821) deviates from casing (1), be equipped with compression spring (824) in annular (816), compression spring (824) make clamping ring (823) support tight abaculus (821), and make the lateral wall of tight annular (816) is supported towards the one end of casing (1) in abaculus (821).

5. An adjustable speed motor according to claim 4, wherein: one end of the embedded ring (821) departing from the casing (1) is provided with balls (8212) along the circumferential interval, and the periphery of each ball (8212) is in rolling contact with the compression ring (823).

6. An adjustable speed motor according to claim 3, wherein: the driver (7) is used for driving the screw rod (6) to rotate, one end of the screw rod (6) extends into the shell (1), a sleeve (221) is further arranged on the end cover (22), the sleeve (221) is sleeved with the end of the screw rod (6), and a distance exists between the end of the screw rod (6) and the end face of the end cover (22).

7. An adjustable speed motor according to claim 6, wherein: be equipped with draw-in groove (8221) on slide (822), be equipped with guide arm (8222) in draw-in groove (8221), guide arm (8222) parallel screw rod (6), the periphery of ring (821) is equipped with otic placode (8211), otic placode (8211) inlays and establishes to draw-in groove (8221) in to slide and cup joint on guide arm (8222), just the both sides that are located otic placode (8211) in draw-in groove (8221) all are equipped with expanding spring (8223), the both ends of expanding spring (8223) support the lateral wall of tight otic placode (8211), draw-in groove (8221) respectively.

8. An adjustable speed motor according to claim 2, wherein: both ends of ring gear (814) all are equipped with friction member (815), two friction member (815) are used for butt flabellum (5), casing (1) respectively.

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