Air-cooled motor and piston air compressor

Abstract

An air-cooled motor and a piston air compressor. The air-cooled motor comprises a housing (1); a motor assembly (2) and a fan (3) are provided in the housing (1); a rotor (7) of the motor assembly and the fan (3) are provided on a rotor shaft (21); a piston air compressor is provided in the housing (1); the piston air compressor comprises a cylinder (8) and a piston (10); the piston (10) is provided in the cylinder (8); a second stator is provided around the periphery of the cylinder (8); a second winding (9) is provided on the second stator; a second permanent magnet (12) is provided on the piston (10). When first alternating current power is applied to a first stator (4), the rotor (7) drives the rotor shaft (21) to rotate, and the fan (3) blows air toward the motor assembly (2) and the piston air compressor; when a positive- / negative-polarity rectangular pulse power supply is provided to the second winding (9), the piston (10) moves in the cylinder so as to compress air and the compressed air is stored in a storage container. The motor assembly (2) and the piston air compressor can be simultaneously cooled by means of one fan (3), thereby reducing costs and achieving a compact structure.

Description

A wind-cooled motor and a piston air compressor Technical Field

[0001] This invention provides an air-cooled motor and a piston-type air compressor, belonging to the field of motor technology. Background Technology

[0002] Chinese invention patent application CN117595560A discloses an electric motor, including a housing. A left bearing assembly and a right bearing assembly are respectively disposed on both sides of the housing. The left and right bearing assemblies are fixed to blind holes in the housing via, for example, long screws through mounting holes in a cover. A stator is disposed in the center of an internal cavity of the housing, and an armature winding is disposed on the stator. A rotor is disposed in a cavity formed in the center of the stator, and the rotor is mounted on an output spindle. The left and right bearing assemblies are respectively disposed at both ends of the output spindle. A fan blade is also disposed on the output shaft outside the right bearing assembly. A fan shroud is disposed around the outer periphery of the fan blade, and the fan shroud is connected to the housing so that they together form an internal receiving cavity. The above patent application uses a fan blade on the output shaft to provide air cooling for the internal components of the motor.

[0003] In the existing technology, reciprocating air compressors require an electric motor to drive the piston to move inside the cylinder and further compress the air. However, the repeated movement of the piston inside the cylinder also causes the reciprocating air compressor to heat up, so additional equipment is needed to cool the reciprocating air compressor. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention provides an air-cooled motor and a piston air compressor, which can simultaneously cool the motor assembly and the piston air compressor with a single fan blade, saving costs and enabling a compact structure.

[0005] To achieve the aforementioned objective, this invention provides an air-cooled motor, comprising a housing, within which a motor assembly and a fan are disposed. The motor assembly includes a first stator, a rotor, and a rotor shaft. The rotor is disposed within a first cylindrical cavity formed by the first stator. The rotor and the fan are mounted on the rotor shaft. The invention is characterized by further comprising a piston-type air compressor within the housing. The piston-type air compressor includes a cylinder and a piston, the piston being disposed within the cylinder. A second stator is disposed around the outer periphery of the cylinder. The second stator includes a cylindrical support and a second winding wound around the cylindrical support. A second permanent magnet is disposed on the piston. When a first alternating current is applied to the first stator, the rotor drives the rotor shaft to rotate, and the fan blows air to the motor assembly and the piston-type air compressor. When a rectangular pulse power supply with positive and negative polarities is provided to the second winding, the piston moves within the cylinder, thereby compressing the air and storing it in a storage container.

[0006] The present invention uses a single fan blade to simultaneously cool the motor assembly and the reciprocating air compressor, thereby saving costs and enabling a compact structure.

[0007] Preferably, the rotor forms a third cylindrical cavity therein, and a third stator is disposed in the third cylindrical cavity. The third stator includes a third winding. The first stator includes a first winding. When a first alternating current is applied to the first winding, a rotating magnetic field is formed, which drives the rotor to rotate in the cylindrical cavity. The third winding induces a second alternating current.

[0008] The present invention enables the third stator and the third winding, which are arranged in the cavity formed inside the rotor, to generate alternating current energy when the rotor rotates, through the above technical solution.

[0009] Preferably, the air-cooled motor further includes a processing module, which processes the second AC power to generate a positive and negative polarity rectangular pulse power supply, wherein the positive and negative polarity rectangular pulse power supply outputs a positive DC voltage for a first duration and outputs a negative DC voltage for a second duration.

[0010] The present invention, through the above technical solution, can convert the AC power generated by the third stator and the third winding into positive and negative pulse power under the action of the processing module.

[0011] Preferably, the air-cooled motor includes a control device, which includes a control module and N+1 electronic switches; a second cylindrical cavity is formed inside the second stator, and the cylinder is disposed inside the second cylindrical cavity; the second winding includes N coils; the N coils are evenly wound around the cylindrical support around the cylinder and arranged along the axial direction of the cylinder; the N coils are connected in series with each other; the middle node of the series-connected coils and the outer leads of the coils at both ends are connected to a positive and negative polarity rectangular pulse power supply through an electronic switch; the control terminal of the electronic switch is provided with high and low levels by the control module to control the conduction and cutoff of the electronic switch; the positive and negative polarity rectangular pulse power supply changes its polarity according to the running direction of the second permanent magnet.

[0012] The present invention, through the above technical solution, can generate a magnetic field in the second cylindrical cavity formed in the second stator, causing the second permanent magnet to move in a straight line.

[0013] Preferably, the second stator forms a second cylindrical cavity, the lower end of the cylinder is disposed in the second cylindrical cavity, and the two ends of the second winding are connected to the two ends of a positive and negative polarity rectangular pulse power supply; the positive and negative polarity rectangular pulse power supply changes its polarity according to the running direction of the second permanent magnet.

[0014] The present invention, through the above technical solution, can generate a magnetic field in the second cylindrical cavity formed in the second stator, causing the second permanent magnet to move in a straight line.

[0015] Preferably, the air-cooled motor further includes a piston moving assembly, which includes a crank, a connecting rod, and a piston pin integrally formed with the rotor shaft. A hole for the crank to pass through is formed at the first end of the connecting rod; a hole for the piston to pass through is formed at the second end of the connecting rod; and the piston pin is disposed on the piston.

[0016] The present invention, through the above technical solution, can simultaneously drive the piston of a reciprocating air compressor to run in the cylinder while the rotor shaft rotates to drive the fan blades to rotate.

[0017] To achieve the aforementioned objective, the present invention also provides a piston-type air compressor, which includes a cylinder and a piston disposed within the cylinder. The compressor is characterized by having a second stator disposed on the outer periphery of the cylinder, a second winding disposed on the second stator, and a second permanent magnet disposed on the piston. When a rectangular pulse power supply of positive and negative polarities is supplied to the second winding, the piston moves within the cylinder to compress air and store it in a storage container.

[0018] The present invention utilizes magnetic force to compress air through the above-described technical solution.

[0019] Preferably, the reciprocating air compressor further includes a control device, which includes a control module and N+1 electronic switches; a second cylindrical cavity is formed inside the second stator, and the cylinder is disposed inside the second cylindrical cavity; the second winding includes N coils; the N coils are evenly wound around the cylindrical second stator around the outer periphery of the cylinder, and the N coils are connected in series with each other; the middle node and the outer leads of the coils at both ends of the series-connected coils are all connected to a positive and negative polarity rectangular pulse power supply through an electronic switch; the control terminal of the electronic switch is provided with high and low levels by the control module to control the conduction and cutoff of the electronic switch; the positive and negative polarity rectangular pulse power supply changes its polarity according to the running direction of the second permanent magnet.

[0020] The present invention, through the above technical solution, can generate a magnetic field in the second cylindrical cavity formed in the second stator, causing the second permanent magnet to move in a straight line.

[0021] Preferably, a second cylindrical cavity is formed inside the second stator, the lower end of the cylinder is disposed inside the second cylindrical cavity, and the two ends of the second winding are connected to the two ends of a positive and negative polarity rectangular pulse power supply; the positive and negative polarity rectangular pulse power supply changes its polarity according to the running direction of the second permanent magnet.

[0022] The present invention, through the above technical solution, can generate a magnetic field in the second cylindrical cavity formed in the second stator, causing the second permanent magnet to move in a straight line.

[0023] Preferably, the reciprocating air compressor further includes a piston moving assembly, which includes a crank, a connecting rod, and a piston pin integrally formed with the rotor shaft of the motor. A hole for the crank to pass through is formed at a first end of the connecting rod; a hole for the piston to pass through is formed at a second end of the connecting rod; and the piston pin is disposed on the piston.

[0024] The present invention, through the above technical solution, can drive the piston of a reciprocating air compressor to run in the cylinder when the rotor shaft rotates.

[0025] Compared with the prior art, the air-cooled motor and reciprocating air compressor provided by the present invention have the following beneficial effects:

[0026] 1. A single fan blade can simultaneously cool the motor assembly and the reciprocating air compressor, saving costs and enabling a compact structure;

[0027] 2. Air compression is achieved by utilizing the magnetic effect or by using the magnetic effect to assist a motor in compressing air. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the air-cooled motor provided in the first embodiment of the present invention;

[0029] Figure 2 is a circuit diagram of the control device for the second stator coil provided in the first embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of the composition of the air-cooled motor provided in the second embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of the second stator coil connected to a rectangular pulse power supply with positive and negative polarities according to the second embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of the air-cooled motor provided in the third embodiment of the present invention. Detailed Implementation

[0033] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention, as well as the methods for achieving these advantages and features, will become clear.

[0034] However, the present invention is not limited to the embodiments disclosed below. These embodiments are only used to make the disclosure of the present invention more complete and to fully inform those skilled in the art of the present invention of the scope of the invention.

[0035] While terms such as "first," "second," etc., are used to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are used only to distinguish one element, component, or part from other elements, components, or parts. Therefore, it is apparent that, within the technical spirit of this disclosure, the first element, first component, or first part mentioned below may also be a second element, second component, or second part, used only to describe embodiments and not intended to limit this disclosure.

[0036] In this specification, unless otherwise specified in the text, the singular includes the plural. The use of "comprising" and / or "consisting of" in this specification does not exclude the presence or addition of one or more other structural elements, steps, actions, and / or components mentioned.

[0037] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, terms defined in commonly used dictionaries shall not be interpreted ideally or excessively unless explicitly and specifically defined.

[0038] In addition, the same or identical structures are labeled with the same reference numerals, and repeated descriptions are omitted.

[0039] First Embodiment

[0040] Figure 1 is a schematic diagram of the composition of the air-cooled motor provided in the first embodiment of the present invention. As shown in Figure 1, the air-cooled motor of the present invention includes a housing 1, and a motor assembly 2 and a fan blade 3 are disposed inside the housing 1. The motor assembly includes a first stator 4, a rotor 7, and a rotor shaft 21. The rotor 7 is disposed within a first cylindrical cavity formed by the first stator 4, and the rotor 7 and the fan blade 3 are disposed on the rotor shaft 21. The first stator 4 includes a first stator core 6 and a first winding 5 wound around the first stator core 6. The rotor 7 includes a plurality of L-shaped magnets, and the N poles and S poles of the plurality of L-shaped magnets are arranged alternately.

[0041] In the first embodiment of the present invention, the air-cooled motor further includes a partition wall 24, which divides the internal space near the motor assembly of the housing 1 into an outer space and an inner space.

[0042] In the first embodiment of the present invention, the rotor 7 forms a third cylindrical cavity therein, and a third stator is disposed within the third cylindrical cavity. The third stator includes a third stator core 14 and a third winding 15 disposed on the third stator core 14. In the present invention, when a first alternating current is applied to the first winding 5, a rotating magnetic field is formed, driving the rotor 7 to rotate in the cylindrical cavity. When the rotor 7 rotates, the third winding 15 within it induces a second alternating current.

[0043] In a first embodiment of the present invention, the air-cooled motor further includes a processing module. This processing module processes the second AC power to generate a rectangular pulse power supply with positive and negative polarities. The rectangular pulse power supply outputs a positive DC voltage for a first duration and a negative DC voltage for a second duration; preferably, the first and second durations are equal. Processing the second AC power to generate the rectangular pulse power supply includes, for example, using known techniques such as Schmitt triggers, comparators, or zero-crossing comparators.

[0044] In the first embodiment of the present invention, a piston-type air compressor is further provided inside the housing 1. The piston-type air compressor includes a cylinder 8 and a piston 10 disposed inside the cylinder. A second stator is disposed around the outer periphery of the cylinder. The second stator includes a cylindrical support and a second winding 9 wound on the cylindrical support. The second winding 9 is cylindrical and surrounds the cylindrical support around the outer periphery of the cylinder, and is evenly arranged along the axial direction of the cylinder and covers most of the cylinder area. When a rectangular pulse power supply with positive and negative polarities is applied to the second winding 9, the magnetic field lines of the generated magnetic field are parallel to the axis of the cylinder. A second permanent magnet 12 is disposed on the piston. One end of the second permanent magnet 12 is the N pole, and the other end is the S pole. When a rectangular pulse power supply with positive and negative polarities is provided to the second winding, the piston, together with the second permanent magnet 12, moves within the cylinder 8 to compress air and store it in a storage container.

[0045] In the first embodiment of the present invention, two through holes are provided on the housing 1 corresponding to the bottom of the cylinder, namely a first air inlet 17 and a first exhaust port 18. Both the first air inlet 17 and the first exhaust port 18 are connected to the cylinder. A one-way air inlet valve is provided at the first air inlet 17 and a one-way exhaust valve is provided at the first exhaust port 18.

[0046] The air-cooled motor provided in the first embodiment of the present invention further includes a piston moving assembly, which includes a crank 27 integrally formed with the rotor shaft 21, a connecting rod 26, and a piston pin 11. A hole for the crank 27 to pass through is formed at the first end of the connecting rod 26. A hole for the piston pin 11 to pass through is formed at the second end of the connecting rod 26. The piston pin 11 is disposed on the piston, and the piston pin 11 and a second permanent magnet are disposed on the two end faces of the piston. The connecting rod 26 is rotatable relative to the crank 27 and the piston.

[0047] In the first embodiment, bearing holes are provided at the center of both ends of the housing 1, wherein a first bearing 19 and a second bearing 22 are respectively provided to support the rotor shaft 21. A second air inlet 20 and a second air outlet 23 are respectively provided on both end faces of the housing 1.

[0048] When the first AC power is applied to the first stator, the rotor drives the rotor shaft to rotate, and the fan blows air to the motor assembly and the reciprocating air compressor, while the reciprocating air compressor compresses the air.

[0049] The air-cooled motor provided by the present invention also includes a control device, which is used to control the direction and intensity of the magnetic field formed in the cylinder when the second winding is energized, so that the second permanent magnet runs along the axial direction of the cylinder.

[0050] Figure 2 is a circuit diagram of the control device provided in the first embodiment of the present invention. The control device includes a control module and N+1 electronic switches, namely electronic switches T1, T2, T3, ..., TN+1. A second stator forms a second cylindrical cavity, and a cylinder is disposed within the second cylindrical cavity. The second winding includes N coils, namely coil L1, coil L2, coil L3, ..., coil LN. The N coils are uniformly wound around the outer circumference of the cylinder and connected in series. The intermediate nodes and the outer leads of the coils at both ends of the series-connected coils are connected to a positive and negative polarity rectangular pulse power supply through an electronic switch. The control terminal of the electronic switch is provided with high and low levels by the control module to control the conduction and cutoff of the electronic switch. The positive and negative polarity rectangular pulse power supply changes its polarity according to the running direction of the second permanent magnet. The electronic switch can be, for example, a CMOS transistor or a relay.

[0051] The working process of the air-cooled motor provided in the first embodiment is as follows: AC power is supplied to the first winding, the rotor rotates, the rotor drives the shaft to rotate, the fan starts to work, blowing air to the motor assembly and the piston air compressor, thereby cooling the motor assembly and the piston air compressor. When the rotor shaft rotates, the crank drives the second permanent magnet to move from the top to the bottom of the cylinder. The control module provides control signals to the electronic control switches T1 to TN+1, so that electronic control switches T1 and TN+1 are turned on, while electronic control switches T2 to TN are turned off. At this time, the positive and negative polarity rectangular pulse power supply provides positive DC voltage to N coils connected in series. The absolute value of the current flowing into the N coils is I1N. The direction of the magnetic field formed in the coil is as shown by the dotted line A. The magnetic field generated by the N coils connected in series also causes the second permanent magnet to run along the cylinder from the top to the bottom, thereby compressing the air in the cylinder. When the piston travels for the first duration t1N, the control module provides control signals to the electronic control switches T1 to TN+1, causing the electronic control switches T1 and TN to conduct, while the electronic control switches T2 to TN-1 and TN+1 are disconnected. At this time, the positive and negative polarity rectangular pulse power supply provides positive DC voltage to the N-1 coils connected in series. The absolute value of the current flowing into the N-1 coils is I1(N-1), where I1(N-1) > I1N. The direction of the magnetic field formed in the coils is as shown by the dashed line A. The magnetic field generated by the N-1 coils connected in series also causes the second permanent magnet to continue moving along the bottom of the cylinder, further compressing the air in the cylinder. After the piston has traveled for t1(N-1) hours, the control module provides control signals to the electronic switches T1 through TN+1, turning on switches T1 and TN-1, while turning off switches T2 through TN-2, TN, and TN+1. At this time, the positive and negative polarity rectangular pulse power supply provides positive DC voltage to N-2 coils connected in series, and so on. This process repeats until one end of the second permanent magnet contacts the bottom of the cylinder, and only coil L1 is connected to the positive and negative polarity rectangular pulse power supply. At this point, the exhaust valve at the bottom of the cylinder opens, releasing compressed air into the storage container.

[0052] In the first embodiment, the above-described control method provides a gradually increasing magnetic force to the second permanent magnet, thereby compensating for the gradually increasing load of the motor driving the reciprocating air compressor during the air compression process, and keeping the load of the motor driving the reciprocating air compressor during the air compression process constant.

[0053] When the crank drives the second permanent magnet to move from the bottom to the top of the cylinder, the intake valve opens and the exhaust valve closes. The control module provides control signals to the electronic control switches T1 to TN+1, turning on electronic control switches T1 and TN+1, while turning off electronic control switches T2 to TN. At this time, the positive and negative polarity rectangular pulse power supply provides negative DC voltage to N coils, and the absolute value of the current flowing into the N coils is I2N. The direction of the magnetic field formed in the coils is shown as shown by the dashed line B. The magnetic field generated by the N coils also causes the second permanent magnet to move along the cylinder from the bottom to the top, and the cylinder draws in air from the outside. After the piston has traveled for t2N, the control module provides control signals to the electronic control switches T1 to TN+1, causing the electronic control switches T2 and TN+1 to conduct while the electronic control switches T3 to TN and T1 to disconnect. At this time, the positive and negative polarity rectangular pulse power supply provides a negative DC voltage to the N-1 coils connected in series. The absolute value of the current flowing into the N-1 coils connected in series is I2(N-1), where I2N < I2(N-1). The direction of the magnetic field formed in the coil is as shown by the dashed line B. The magnetic field generated by the N-1 coils connected in series also causes the second permanent magnet to continue moving upward along the cylinder, further drawing air into the cylinder. After the piston has traveled for t2(N-1) hours, the control module provides control signals to the electronic switches T1 to TN+1, turning on electronic switches T3 and TN+1, while turning off electronic switches T4 to TN and T1 to T2. At this time, the positive and negative polarity rectangular pulse power supply provides positive DC voltage to N-2 coils connected in series, and so on, until the second permanent magnet reaches the top of the cylinder. Simultaneously, all coils are connected in series to the positive and negative polarity rectangular pulse power supply, and the cylinder is filled with air.

[0054] In the first embodiment, the above-described control method provides a gradually increasing magnetic force to the second permanent magnet, thereby compensating for the gradually increasing load of the motor in driving the reciprocating air compressor during the air intake process, and keeping the load of the motor in driving the reciprocating air compressor during the air intake process constant.

[0055] The above process is repeated, compressing the air and storing it in the storage container.

[0056] Second Embodiment

[0057] The second embodiment of the present invention only describes the content that is different from the first embodiment; the same content will not be repeated.

[0058] Figure 3 is a schematic diagram of the air-cooled motor provided in the second embodiment of the present invention. As shown in Figure 3, the air-cooled motor provided in the second embodiment differs from that in the first embodiment only in that it is a piston-type air compressor. The second stator forms a second cylindrical cavity, and the lower end of the cylinder is disposed in the second cylindrical cavity. The two ends of the second winding are connected to the two ends of a positive and negative polarity rectangular pulse power supply. The positive and negative polarity rectangular pulse power supply changes its polarity according to the running direction of the second permanent magnet. The coil on the outer periphery of the cylinder is disposed on the outer periphery of the bottom of the cylinder, and there is only one coil.

[0059] Figure 4 is a schematic diagram of the second stator coil connected to the positive and negative rectangular pulse power supply according to the second embodiment of the present invention. As shown in Figure 4, the second stator coil is directly connected to both ends of the positive and negative rectangular pulse power supply.

[0060] The working process of the air-cooled motor provided in the second embodiment is as follows: AC power is provided to the first winding, the rotor rotates, the rotor drives the shaft to rotate, the fan starts to work, blowing air to the motor assembly and the piston air compressor, cooling the motor assembly and the piston air compressor; when the rotor shaft rotates, the crank drives the second permanent magnet to move from the top to the bottom of the cylinder, the positive and negative rectangular pulse power supply provides positive DC voltage to the coil L, so that the magnetic field formed in the coil is in the direction shown by the dotted line A. The magnetic field generated by the coil L also causes the second permanent magnet to run along the cylinder from the top to the bottom, thereby compressing the air in the cylinder; when the piston runs to the bottom of the cylinder, the exhaust valve opens, and the compressed air is discharged into the storage container.

[0061] As the crankshaft moves the second permanent magnet from the bottom to the top of the cylinder, the intake valve opens and the exhaust valve closes. A rectangular pulse power supply with positive and negative polarities provides a negative DC voltage to coil L, causing the magnetic field formed within the coil to be in the direction shown by dashed line B. The magnetic field generated by the coil also causes the second permanent magnet to move along the cylinder from bottom to top, drawing air in from the outside. This process is repeated, compressing the air and storing it in the storage container.

[0062] Third Embodiment

[0063] The third embodiment of the present invention only describes the content that is different from the first embodiment; the same content will not be repeated.

[0064] Figure 5 is a schematic diagram of the air-cooled motor provided in the third embodiment of the present invention. The rotor shaft of the air-cooled motor provided in the third embodiment is a straight shaft without a crank. The connecting rod 26 and the piston pin 11 are also omitted.

[0065] In the third embodiment, the top of the cylinder is a sealed structure. A piston 28 is disposed inside the cylinder, and a second permanent magnet 12 is mounted on the piston. One end of the second permanent magnet 12 is an N pole, and the other end is a S pole. The piston 28 is disc-shaped. The control device of the third embodiment is still described with reference to Figure 2.

[0066] The control device includes a control module and N+1 electronic switches, such as electronic switches T1, T2, T3, ..., TN+1. The second stator forms a second cylindrical cavity, and the cylinder is disposed within the second cylindrical cavity. The second winding includes N coils, such as coil L1, coil L2, coil L3, ..., coil LN. The N coils are evenly wound around the outer circumference of the cylinder and connected in series. The intermediate nodes and the outer leads of the coils at both ends of the series-connected coils are connected to a positive and negative polarity rectangular pulse power supply through an electronic switch. The control terminal of the electronic switch is provided with high and low levels by the control module to control the conduction and cutoff of the electronic switch. The positive and negative polarity rectangular pulse power supply changes its polarity according to the running direction of the second permanent magnet. The electronic switch can be, for example, a CMOS transistor, a relay, etc.

[0067] The working process of the air-cooled motor provided in the third embodiment is as follows: AC power is provided to the first winding, the rotor rotates and drives the shaft to rotate, the fan starts to work, blows air to the motor assembly and the piston air compressor, and cools the motor assembly and the piston air compressor.

[0068] The control module provides control signals to the electronic switches T1 to TN+1, turning on electronic switches T1 and TN+1, while turning off electronic switches T2 to TN. At this time, the positive and negative polarity rectangular pulse power supply provides negative DC voltage to the N coils. The absolute value of the current flowing into the N coils is I2N. The direction of the magnetic field formed in the coils is shown as shown by the dotted line B. The magnetic field generated by the N coils also causes the second permanent magnet to move along the cylinder from bottom to top. The intake valve opens and the exhaust valve closes, allowing the cylinder to draw in air from the outside. After the piston has traveled for t2N, the control module provides control signals to the electronic switches T1 to TN+1, turning on the electronic switches T2 and TN+1, while turning off the electronic switches T3 to TN and T1. At this time, the positive and negative polarity rectangular pulse power supply provides negative DC voltage to the N-1 coils connected in series. The absolute value of the current flowing into the N-1 coils connected in series is I2(N-1), where I2N < I2(N-1). The direction of the magnetic field formed in the coil is as shown by the dashed line B. The magnetic field generated by the N-1 coils connected in series also causes the second permanent magnet to continue moving upward along the cylinder, further drawing air into the cylinder. After the piston has traveled for t2(N-1) hours, the control module provides control signals to the electronic switches T1 to TN+1, turning on electronic switches T3 and TN+1, and disconnecting the circuits from electronic switches T4 to TN and T1 to T2. At this time, the positive and negative polarity rectangular pulse power supply provides positive DC voltage to N-2 coils connected in series, and so on, until the second permanent magnet reaches the top of the cylinder. Simultaneously, all coils are connected in series to the positive and negative polarity rectangular pulse power supply, and the cylinder is filled with air.

[0069] Then, the control module provides control signals to the electronic control switches T1 to TN+1, turning on electronic control switches T1 and TN+1, while turning off electronic control switches T2 to TN. At this time, the positive and negative polarity rectangular pulse power supply provides positive DC voltage to the N coils connected in series. The absolute value of the current flowing into the N coils is I1N. The direction of the magnetic field formed in the coil is as shown by the dashed line A. The magnetic field generated by the N coils connected in series also causes the second permanent magnet to run along the cylinder from top to bottom, thereby compressing the air in the cylinder. When the piston runs for the first duration t1N, the control module provides control signals to the electronic control switches T1 to TN+1, turning on the electronic control switches T1 and TN, while turning off the electronic control switches T2 to TN-1 and TN+1. At this time, the positive and negative polarity rectangular pulse power supply provides positive DC voltage to the N-1 coils connected in series. The absolute value of the current flowing into the N-1 coils is I1(N-1), where I1(N-1) > I1N. The direction of the magnetic field formed in the coil is as shown by the dashed line A. The magnetic field generated by the N-1 coils connected in series also causes the second permanent magnet to continue running along the bottom of the cylinder, further compressing the air in the cylinder. After the piston has run for a duration t1(N-1), the control module provides control signals to the electronic switches T1 to TN+1, turning on switches T1 and TN-1, while turning off switches T2 to TN-2, TN, and TN+1. At this time, a rectangular pulse power supply provides a positive DC voltage to N-2 coils connected in series, and so on. This process repeats until one end of the second permanent magnet contacts the bottom of the cylinder, and only coil L1 is connected to the rectangular pulse power supply. At this point, the exhaust valve at the bottom of the cylinder opens, releasing compressed air into the storage container.

[0070] Third embodiment. The above control method causes the piston to drive the second permanent magnet, which compresses the air.

[0071] In the third embodiment, a first DC power of relatively low power can be provided to the first winding, while a positive and negative rectangular pulse power supply of relatively high power can be provided to the second stator winding.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An air-cooled motor, comprising a housing, within which a motor assembly and fan blades are disposed, the motor assembly comprising a first stator, a rotor, a rotor shaft, and a control device, the rotor being disposed within a first cylindrical cavity formed by the first stator, and the rotor and fan blades being disposed on the rotor shaft, characterized in that, The housing also houses a piston-type air compressor, which includes a cylinder and a piston. The piston is disposed within the cylinder, and a second stator is disposed around the outer periphery of the cylinder. The second stator includes a cylindrical support and a second winding wound around the cylindrical support. A second permanent magnet is disposed on the piston. A second cylindrical cavity is formed within the second stator, and the cylinder is disposed within the second cylindrical cavity. The second winding includes N coils, which are evenly wound around the cylindrical support around the outer periphery of the cylinder and arranged along the axial direction of the cylinder. The N coils are connected in series. When a first alternating current is applied to the first stator, the rotor drives the rotation... The spindle rotates, and the fan blows air to the motor assembly and the reciprocating air compressor. When a rectangular pulse power supply with positive and negative polarities is supplied to the second winding, the piston moves inside the cylinder to compress the air and store it in the storage container. The control device includes a control module and N+1 electronic switches. The intermediate nodes of the series-connected coils and the outer leads of the coils at both ends are all connected to the rectangular pulse power supply with positive and negative polarities through an electronic switch. The control terminals of the electronic switches are provided with high and low levels by the control module to control the switching on and off. The rectangular pulse power supply with positive and negative polarities changes its polarity according to the running direction of the second permanent magnet.

2. The air-cooled motor according to claim 1, characterized in that, The rotor forms a third cylindrical cavity within it, and a third stator is disposed within the third cylindrical cavity. The third stator includes a third winding. The first stator includes a first winding. When a first alternating current is applied to the first winding, a rotating magnetic field is formed, which drives the rotor to rotate in the cylindrical cavity. The third winding induces a second alternating current.

3. The air-cooled motor according to claim 2, characterized in that, It also includes a processing module that processes the second AC power to generate a positive and negative polarity rectangular pulse power supply, which outputs a positive DC voltage for a first duration and a negative DC voltage for a second duration.

4. The air-cooled motor according to any one of claims 1-3, characterized in that, It also includes a piston moving assembly, which includes a crank, a connecting rod and a piston pin integrally formed with the rotor shaft, a hole for the crank to pass through is formed at a first end of the connecting rod; a hole for the piston to pass through is formed at a second end of the connecting rod; and the piston pin is disposed on the piston.

5. A reciprocating air compressor, comprising a cylinder, a piston, a control device, and a piston moving assembly, wherein the piston is disposed within the cylinder, characterized in that, A second stator is disposed on the outer periphery of the cylinder. The second stator includes a second winding and forms a second cylindrical cavity. The cylinder is disposed within the second cylindrical cavity. The second winding includes N coils. The N coils are evenly wound around the cylindrical second stator on the outer periphery of the cylinder and are connected in series. A second permanent magnet is disposed on the piston. When a rectangular pulse power supply with positive and negative polarities is provided to the second winding, the piston moves within the cylinder to compress air and store it in a storage container. The control device includes a control module and N+1 electrically controlled switches connected in series at the intermediate nodes of the coils. The coil leads at both ends are connected to a rectangular pulse power supply with positive and negative polarities via an electronically controlled switch. The control terminal of the electronically controlled switch is provided with high and low levels by the control module to control the switching on and off. The rectangular pulse power supply with positive and negative polarities changes according to the running direction of the second permanent magnet. The piston moving assembly includes a crank, connecting rod, and piston pin integrally formed with the rotor shaft of the motor. A hole for the crank to pass through is formed at the first end of the connecting rod. A hole for the piston to pass through is formed at the second end of the connecting rod. The piston pin is set on the piston. The rotor and fan blades are set on the rotor shaft.

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