CN110165864A - Linear motion motor and application method - Google Patents

Abstract

The invention relates to a linear motion motor, comprising: a casing, a front end cover and a rear end cover respectively connected with the casing, an output shaft, and a ring-shaped coil stator fixed in the casing, which is connected with the output shaft and has a length less than that of the ring. The permanent magnet mover of the coil stator; the output shaft and the front end cover are axially slidably connected through the front bearing; the output shaft and the rear end cover are axially slidably connected through the rear bearing. In the linear motion motor, through the cooperation of the annular coil stator and the permanent magnet mover passing through the annular coil stator, the magnetic field generated by the electrification of the annular coil stator interacts with the permanent magnetic field of the outer ring of the NdFeB magnet, The outer ring of the NdFeB magnet drives the output shaft to move linearly along the axial direction through the inner ring of the yoke. It does not require Hall elements and other devices. The structure is simple, and the length and dimension of the linear motion direction are relatively short.

Description

Linear motion motor and its usage

technical field

The invention relates to the field of motors, in particular to a linear motion motor and a use method.

Background technique

When doing mechanical linear motion, it is necessary to convert the rotational power of the rotating motor into the driving force of linear motion through an intermediate conversion mechanism. The intermediate conversion mechanism reduces mechanical efficiency and improves energy consumption, and the cost is high; the common linear motor is a kind of Electric energy is directly converted into linear motion mechanical energy without the need for a drive device for an intermediate conversion mechanism. It can be regarded as a rotating motor that is cut radially and developed into a plane; its mover (rotor) includes coil windings, Hall element circuit board, thermistor (temperature sensor monitors temperature) and electronic interface; the side evolved from the stator is called the primary, and the side evolved from the rotor is called the secondary; the primary and secondary manufacturing into different lengths to ensure that the coupling between the primary and secondary remains unchanged within the required travel range; linear motors can be short primary and long secondary, or long primary and short secondary; traditional linear motors require Devices such as Hall elements have complex structures and long lengths in the direction of linear motion. Therefore, it is urgent to design a linear motion motor that does not require Hall elements and other devices with a simple structure and a shorter length in the direction of linear motion and its use. solved problem.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of current linear motors that require Hall elements and other devices with complex structures and long dimensions in the direction of linear motion, and provide a device that does not require Hall elements and other devices with a simple structure and relatively small lengths in the direction of linear motion. Short linear motion motor and method of use.

Concrete technical scheme of the present invention is:

A linear motion motor, comprising: a casing, a front end cover and a rear end cover respectively connected to the casing, an output shaft, and a ring-shaped coil stator fixed in the casing, which is connected to the output shaft and has a length shorter than that of the ring-shaped coil stator The permanent magnet mover; the output shaft and the front end cover are axially slidably connected through the front bearing; the output shaft and the rear end cover are axially slidably connected through the rear bearing. In the linear motion motor, through the cooperation of the annular coil stator and the permanent magnet mover passing through the annular coil stator, the magnetic field generated by the electrification of the annular coil stator interacts with the permanent magnetic field of the outer ring of the NdFeB magnet, The outer ring of the NdFeB magnet drives the output shaft to move linearly along the axial direction through the inner ring of the yoke. It does not need Hall elements and other devices. The structure is simple, and the length and dimension of the linear motion direction are relatively short.

Preferably, the permanent magnet mover includes: an NdFeB magnet outer ring, a yoke inner ring connected to the output shaft and the NdFeB magnet outer ring respectively; Out of the two ends of the inner ring of the yoke; the outer sleeve of the output shaft is provided with a buffer return spring that connects the two ends of the rear end of the front bearing and the front end of the inner ring of the yoke in one-to-one correspondence; the front end of the rear bearing protrudes from the front end of the rear end cover; The outer diameter of the ring is larger than that of the rear bearing; the distance between the front end of the rear bearing and the front end of the rear end cover is greater than the distance between the rear end of the NdFeB magnet outer ring and the rear end of the yoke inner ring; The material is mild steel. The buffer return spring is beneficial to the buffer and reset of the permanent magnet mover; the material of the inner ring of the yoke is low carbon steel with better magnetic conductivity.

Preferably, the front end of the outer ring of the NdFeB magnet is an S pole, and the front end of the outer ring of the NdFeB magnet is an N pole. It meets the requirement that the outer ring of the NdFeB magnet drives the output shaft to move linearly along the axial direction through the inner ring of the yoke.

Preferably, a buffer washer is provided at the rear end of the inner ring of the yoke. Buffer the impact force when the permanent magnet mover resets.

As a preference, an anti-rotation groove is provided at the rear end of the side wall of the output shaft, and an anti-rotation block whose width matches the width of the anti-rotation groove and whose inner end extends into the anti-rotation groove is arranged on the inner side of the rear bearing. The anti-rotation block and the anti-rotation slot cooperate to prevent the permanent magnet mover from rotating relative to the ring coil stator.

Preferably, the front bearing is a linear bearing or an oil bearing; the rear bearing is a linear bearing or an oil bearing. The linear bearing improves the linear motion accuracy of the output shaft; the oil bearing is low in cost, can absorb vibration and reduce noise, and is easy to maintain and does not need to add lubricating oil during a long working time.

A method for using a linear motion motor. The linear motion motor is the linear motion motor described above. (1) The ring coil stator is connected to an AC power supply. According to Ampere's law, the ring coil stator generates an alternating magnetic field after being energized. According to the principle of the same-sex attraction and opposite-sex repulsion of the magnetic field, the magnetic field generated by the ring coil stator energized interacts with the permanent magnetic field of the outer ring of the NdFeB magnet, and the outer ring of the NdFeB magnet drives the output shaft to vibrate linearly along the axial direction through the inner ring of the yoke. ;The vibration frequency can be adjusted by adjusting the frequency of the AC power supply, and the amplitude of the linear vibration of the output shaft along the axial direction can be adjusted by adjusting the voltage of the AC power supply; (2) The annular coil stator is connected to the DC power supply. After the coil stator is energized, a magnetic field is generated. According to the principle of the same-sex attraction and opposite-sex repulsion of the magnetic field, the magnetic field generated by the toroidal coil stator interacts with the permanent magnetic field of the outer ring of the NdFeB magnet. The output shaft protrudes forward; the distance of the output shaft protruding forward can be changed by adjusting the voltage of the DC power supply; when the annular coil stator is de-energized or reversely energized, under the return force of the buffer return spring, or under the buffer reset Under the combined action of the spring return force and the magnetic field force, the outer ring of the NdFeB magnet drives the output shaft to reset backward through the inner ring of the yoke. The use method of the linear motion motor can meet the requirement that the linear motion motor does not need Hall elements and other devices, has a simple structure, and has a short length in the direction of linear motion.

Compared with the prior art, the beneficial effect of the present invention is: the linear motion motor, through the cooperation of the ring-shaped coil stator and the permanent magnet mover pierced in the ring-shaped coil stator, the ring-shaped coil stator is energized to produce The magnetic field interacts with the permanent magnetic field of the outer ring of the NdFeB magnet, and the outer ring of the NdFeB magnet drives the output shaft to move linearly along the axial direction through the inner ring of the yoke, without the need for Hall elements and other devices. short. The buffer return spring is beneficial to the buffer and reset of the permanent magnet mover; the material of the inner ring of the yoke is low carbon steel with better magnetic conductivity. The front end of the outer ring of the NdFeB magnet is the S pole, and the front end of the outer ring of the NdFeB magnet is the N pole, which meets the requirement that the outer ring of the NdFeB magnet drives the output shaft to move linearly along the axial direction through the inner ring of the yoke. A buffer washer is provided at the rear end of the inner ring of the yoke to buffer the impact force of the permanent magnet mover when it is reset. The anti-rotation block and the anti-rotation slot cooperate to prevent the permanent magnet mover from rotating relative to the ring coil stator. The linear bearing improves the linear motion accuracy of the output shaft; the oil bearing is low in cost, can absorb vibration and reduce noise, and is easy to maintain and does not need to add lubricating oil during a long working time. The use method of the linear motion motor can meet the requirement that the linear motion motor does not need Hall elements and other devices, has a simple structure, and has a short length in the direction of linear motion.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention;

Fig. 2 is a state diagram after the ring coil stator is supplied with direct current;

Fig. 3 is a state diagram of the toroidal coil stator after the power is cut off or the direction is supplied with direct current.

In the figure: casing 1, front end cover 2, rear end cover 3, output shaft 4, ring coil stator 5, front bearing 6, rear bearing 7, NdFeB magnet outer ring 8, yoke inner ring 9, buffer reset Spring 10, buffer washer 11, anti-rotation groove 12, anti-rotation block 13.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1: a linear motion motor, including: a casing 1, a front end cover 2 and a rear end cover 3 respectively screwed to the casing 1, an output shaft 4, and a ring-shaped The coil stator 5 is connected to the output shaft 4 and is a permanent magnet mover whose length is shorter than the annular coil stator 5; the output shaft 4 and the front end cover 2 are axially slidably connected through the front bearing 6; the output shaft 4 and the rear end cover 3 are connected through the rear bearing 7 Axial sliding connections. The toroidal coil stator 5 is helically wound with enameled wire to form a ring shape; the permanent magnet mover is installed in the toroidal coil stator 5 ; the rear end cover 3 presses against the rear end of the toroidal coil stator 5 .

The permanent magnet mover includes: NdFeB magnet outer ring 8, yoke inner ring 9 connected with output shaft 4 and NdFeB magnet outer ring 8 with interference fit respectively; two NdFeB magnet outer rings 8 Ends correspond to the two ends of the yoke inner ring 9; the output shaft 4 is provided with two ends and the rear end of the front bearing 6 and the front end of the yoke inner ring 9. The front end of the yoke inner ring 9 corresponds to the buffer return spring 10 welded one by one; The front end protrudes from the front end of the rear end cover 3; the outer diameter of the yoke inner ring 9 is greater than the outer diameter of the rear bearing 7; the distance between the front end of the rear bearing 7 and the front end of the rear end cover 3 is greater than the rear end of the NdFeB magnet outer ring 8 and the distance between the rear end of the yoke inner ring 9. The material of the inner ring 9 of the yoke is low carbon steel with better magnetic permeability.

The front end of the NdFeB magnet outer ring 8 is an S pole, and the front end of the NdFeB magnet outer ring 8 is an N pole.

The rear end of the yoke inner ring 9 is provided with a buffer washer 11 .

The rear end of the output shaft 4 is provided with an anti-rotation groove 12, and the inner side of the rear bearing 7 is provided with an anti-rotation block 13 whose width is matched with the width of the anti-rotation groove 12 and the inner end extends into the anti-rotation groove 12.

The front bearing 6 is a linear bearing; the rear bearing 7 is an oil bearing.

A method of using a linear motion motor. The linear motion motor is the linear motion motor described above. (1) The ring coil stator 5 is connected to an AC power supply. According to Ampere's law, the ring coil stator 5 generates alternating current Magnetic field, according to the principle of same-sex attraction and opposite-sex repulsion, the magnetic field generated by the ring coil stator 5 interacts with the permanent magnetic field of the NdFeB magnet outer ring 8, and the NdFeB magnet outer ring 8 is driven by the yoke inner ring 9 to output Shaft 4 vibrates linearly along the axial direction; the vibration frequency can be adjusted by adjusting the frequency of the AC power supply, and the amplitude of the linear vibration of the output shaft 4 along the axial direction can be adjusted by adjusting the voltage of the AC power supply; (2) The annular coil stator 5 and the DC power supply connection, according to Ampere’s law, the magnetic field is generated after the ring coil stator 5 is energized (see accompanying drawing 2, a in the figure is the magnetic force line of the magnetic field generated after the ring coil stator 5 is energized), and according to the principle of the same sex attracts the opposite sex and repels each other, the ring The magnetic field generated by the energized coil stator 5 interacts with the permanent magnetic field of the NdFeB magnet outer ring 8, and the NdFeB magnet outer ring 8 drives the output shaft 4 to protrude forward through the yoke inner ring 9; by adjusting the voltage of the DC power supply The distance that the output shaft 4 protrudes forward can be changed; when the annular coil stator 5 is de-energized or reversely energized (see Figure 3), under the action of the return force of the buffer return spring 10, or under the return force of the buffer return spring 10 Under the combined action of the magnetic field force, the outer ring 8 of the NdFeB magnet drives the output shaft 4 to reset backward through the inner ring 9 of the yoke.

In addition to the above-mentioned embodiments, within the scope disclosed in the claims and description of the present invention, the technical features or technical data of the present invention can be re-selected and combined to form new embodiments, which are not necessary for those skilled in the art. It can be realized by performing creative work, so these embodiments of the present invention that are not described in detail should also be regarded as specific embodiments of the present invention and fall within the protection scope of the present invention.

Claims (6)

1. a kind of linear motion motor, comprising: casing, the drive end bearing bracket and rear end cap being connect respectively with casing, output shaft, feature It is the linear motion motor further include: the annular coil stator being installed in casing is connected with exporting axis and length is less than The permanent magnetic rotor of annular coil stator；Output shaft and drive end bearing bracket are in axial sliding connection by fore bearing；Output shaft and rear end cap are logical Later bearing is in axial sliding connection.

2. linear motion motor according to claim 1, it is characterized in that: the permanent magnetic rotor includes: ndfeb magnet Outer ring, the yoke inner ring being connect respectively with output shaft and ndfeb magnet outer ring；The both ends of ndfeb magnet outer ring correspond Grow the both ends of yoke inner ring；Output outer shaft sleeve is equipped with what both ends connected one to one with fore bearing rear end and yoke inner ring front end Buffer reset spring；Rear end cap front end is stretched out in the front end of rear bearing；The outer diameter of yoke inner ring is greater than the outer diameter of rear bearing；Rear bearing The distance between front and rear end lid front end be greater than the distance between ndfeb magnet outer ring rear end and yoke inner ring rear end.

3. linear motion motor according to claim 2, it is characterized in that: the front end of the ndfeb magnet outer ring is S Pole, the front end of ndfeb magnet outer ring are the pole N.

4. linear motion motor according to claim 2, it is characterized in that: the yoke inner ring rear end is equipped with cushion Circle.

5. linear motion motor according to claim 1 or 2 or 3 or 4, it is characterized in that: the output shaft side wall rear end Equipped with anti-rotation groove, side wall is equipped with that width is adapted to anti-rotation groove width and Anti-rotary block in anti-rotation groove is protruded into inner end in rear bearing.

6. a kind of application method of linear motion motor, the linear motion motor is that claim 1 is any to claim 5 The linear motion motor, it is characterized in that: (1) annular coil stator is connect with AC power source, according to Ampere's law, ring-like line Delineation generates alternating magnetic field after being powered, and according to magnetic field same-sex attraction opposite sex repulsion principle, the energization of annular coil stator is generated The permanent-magnetic field of magnetic field and ndfeb magnet outer ring interacts, and ndfeb magnet outer ring drives output shaft along axis through yoke inner ring To linear oscillator；Vibration frequency can be adjusted by adjusting the frequency of AC power source, by adjusting the voltage of AC power source, can be adjusted Amplitude of the output shaft along axial linear vibration；(2) annular coil stator is connect with DC power supply, according to Ampere's law, ring-like line Delineation generates magnetic field after being powered, according to magnetic field same-sex attraction opposite sex repulsion principle, the magnetic field of annular coil stator energization generation It interacts with the permanent-magnetic field of ndfeb magnet outer ring, ndfeb magnet outer ring drives output shaft to extension through yoke inner ring Out；The distance that output shaft forward extends out can be changed by adjusting the voltage of DC power supply；Annular coil stator power-off or reversed When energization, under buffering reset spring reset force effect, or under buffering reset spring reset force and magnetic field force collective effect, neodymium Iron boron magnets outer ring drives output shaft to reset backward through yoke inner ring.