Wireless motor

Abstract

The present invention relates to a wireless motor comprising: a housing forming the exterior of the motor; a rotor connected to a rotating shaft and rotating the rotating shaft and including at least one magnet; a stator fixed inside the housing; a plurality of coils wound on the stator; a first switch, a second switch, a third switch, and a fourth switch connected to one of the plurality of coils; and a control unit for controlling the first, second, third, and fourth switches, wherein the control unit controls the current flowing on the one coil to flow in a first direction by closing the first switch and the third switch during a first time, and after the first time has passed, controls the current flowing on the one coil to flow in a second direction opposite to the first direction by closing the second switch and the fourth switch during a second time, and the rotor magnetically interacts with the magnet of the rotor of the stator by changes in the current flowing in the first direction and the second direction, and the rotor can rotate the rotating shaft through magnetic interaction with the at least one magnet.

Description

Technology Field

[0001] The present invention relates to a wireless motor that rotates a rotor by switching polarity through a switch. Background Technology

[0002] Motors include wireless motors with brushes, BLDC (Brush-less Direct Current) motors without brushes, AC motors, wireless motors, etc.

[0003] A wireless motor is a motor that rotates by receiving power without physical wires. While conventional motors operate using batteries or wired power sources, wireless motors can operate via wireless power transfer.

[0004] The stator of a motor uses an armature formed by passing current through coils, and the rotor uses a permanent magnet formed by alternating N and S poles. For a BL wireless motor to rotate continuously, it is necessary to form a continuous rotating magnetic field of the BL wireless motor. To form a continuous rotating magnetic field, the commutation of the current flowing through the coils of each phase of the armature must be performed at an appropriate time, and for appropriate commutation, the position of the rotor must be accurately recognized.

[0005] Position detection sensors such as Hall sensors, resolver elements, and encoders have been used to accurately detect the rotor's position; however, these position detection sensors have problems such as increased manufacturing costs and complex driving circuits.

[0006] In addition, for motors containing brushes, wear issues or maintenance cost problems may arise due to brush damage. The problem to be solved

[0007] The objective of the present invention is to reduce wear problems caused by brush damage and maintenance costs by ensuring that the wireless motor does not include a brush.

[0008] The objective of the present invention is to provide a wireless motor with improved energy efficiency and faster switching speed than a wireless motor including a brush by changing polarity through a switch rather than a brush.

[0009] The objective of the present invention is to provide a wireless motor with a simpler configuration than a BL wireless motor that changes polarity through a sensor.

[0010] The objective of the present invention is to provide a wireless motor that eliminates the need for complex feedback control, as there is no need to change the polarity according to the position of the rotor. means of solving the problem

[0011] According to one embodiment of the present invention, a wireless motor comprises: a housing forming the exterior of the motor; a rotor connected to a rotating shaft and rotating the rotating shaft and including at least one magnet; a stator fixed inside the housing; a plurality of coils wound on the stator; a first switch, a second switch, a third switch, and a fourth switch connected to one of the plurality of coils; and a control unit for controlling the first, second, third, and fourth switches, wherein the control unit controls the current flowing on the one coil to flow in a first direction by closing the first switch and the third switch during a first time, and after the first time has passed, controls the current flowing on the one coil to flow in a second direction opposite to the first direction by closing the second switch and the fourth switch during a second time, and the rotor magnetically interacts with the magnet of the rotor of the stator by changes in the current flowing in the first direction and the second direction, and the rotor can rotate the rotating shaft through magnetic interaction with the at least one magnet.

[0012] According to one embodiment, a plurality of coils may include a first coil, a second coil, a third coil, and a fourth coil. A first stator wound with the first coil and a second stator wound with the second coil may form different magnetic poles. A third stator wound with the third coil and a second stator wound with the second coil may also form different magnetic poles.

[0013] According to one embodiment, the first time and the second time may be substantially the same.

[0014] According to one embodiment, the control unit further includes an input unit for inputting the rotational speed of the wireless motor; a receiver unit for receiving the input rotational speed signal; and a speed control unit for controlling the first time and the second time based on the received rotational speed, and the speed control unit can control the change cycle of the first time and the second time based on the rotational speed signal input by the user.

[0015] According to one embodiment, the first switch and the fourth switch are closed during the first time, and when the first switch and the fourth switch are opened after the first time has passed, the first switch, the second switch, the third switch, and the fourth switch are opened during the third time, and after the third time has passed, the second switch and the third switch may be closed during the second time.

[0016] According to one embodiment, the third time may be longer than the first time and the second time.

[0017] According to one embodiment, a heat dissipation member that dissipates heat generated from the first, second, third, and fourth switches may be further included.

[0018] According to one embodiment, the heat dissipation member may be attached to the stator.

[0019] According to one embodiment, the control unit further includes a high-speed gate driver IC, and the high-speed gate driver IC can control the switches more quickly. Effects of the invention

[0020] According to the present invention, the manufacturing cost of the motor and the operating efficiency of the motor can be improved.

[0021] According to the present invention, the structure of the motor can be simplified. Brief explanation of the drawing

[0022] Figure 1 is a perspective view of a wireless motor. Figure 2 is a drawing showing an internal cross-section of a wireless motor. Figure 3 is a diagram illustrating the current flow when the first switch and the fourth switch are closed. Figure 4 is a diagram illustrating the current flow when the second switch and the third switch are closed. Figure 5 is a block diagram illustrating the control unit and the motor. Specific details for implementing the invention

[0023] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0024] Figure 1 is a perspective view of a wireless motor.

[0025] Figure 2 is a drawing showing an internal cross-section of a wireless motor.

[0026] Figure 3 is a diagram illustrating the current flow when the first switch and the fourth switch are closed.

[0027] Figure 4 is a diagram illustrating the current flow when the second switch and the third switch are closed.

[0028] Figure 5 is a block diagram illustrating the control unit and the motor.

[0029] The wireless motor (10) may include a housing (100), a rotor (110), a stator (120), a plurality of coils (130), a plurality of switches (211, 212, 213, 214), and a control unit. Housing (100)

[0030] The housing (100) can form the exterior of the wireless motor (10). A rotor (110), a stator (120), and a plurality of coils (130) can be arranged within the housing (100).

[0031] rotor (110) and ball bearing (150)

[0032] The rotor (110) may be placed inside the housing (100). The rotor (110) may include at least one magnet. The rotor (110) may include a first magnet (111) and a second magnet (112). The first magnet (111) and the second magnet (112) may have different magnetic poles. For example, the first magnet (111) may have a North pole and the second magnet (112) may have a South pole. As another example, the first magnet (111) may have a South pole and the second magnet (112) may have a North pole.

[0033] The rotor (110) can be connected to a rotation axis (140). For example, the rotation axis (140) can rotate by the rotation of the rotor (110).

[0034] The rotor (110) can magnetically interact with the stator (120) by including magnets having different polarities. Through the magnetic interaction between the rotor (110) and the stator (120), the rotation axis (140) connected to the rotor (110) can rotate. By rotating the rotation axis (140), electrical energy can be converted into physical energy.

[0035] The ball bearing (150) can allow the rotor (110) to rotate smoothly.

[0036] Stator (120) and multiple coils (130)

[0037] The stator (120) may be fixed inside the housing (100). The stator (120) may include a first stator (121), a second stator (122), and a third stator (123). The first stator (121), the second stator (122), and the third stator (123) may be spaced apart at regular intervals.

[0038] A plurality of coils (130) can be wound onto a stator (120). For example, among the plurality of coils (130), a first coil (131) can be wound onto a first stator (121), a second coil (132) can be wound onto a second stator (122), and a third coil (133) can be wound onto a third stator (123). A fourth coil (134) can be wound onto a fourth stator (124).

[0039] Referring to FIG. 2, the coil is illustrated and described as being composed of four coils, but is not limited thereto. The number of coils can be a multiple of 2. For example, the coils and stators can be formed with 2, 4, 8, or more.

[0040] One of the multiple coils (130) may be connected to multiple switches. For example, referring to FIG. 1, the multiple coils (130) may include a first coil (131), a second coil (132), and a third coil (133). The first coil (131) may be connected to a first switch (211), a second switch (212), a third switch (213), and a fourth switch (214).

[0041] During the process in which the first switch (211) and the fourth switch (214) are opened and closed together, and the process in which the second switch (212) and the third switch (213) are opened and closed together, currents of different directions may flow on the first coil (131).

[0042] The opening and closing of the first switch (211), the second switch (212), the third switch (213), and the fourth switch (214) can be controlled by a control unit described later.

[0043] Although the first coil (131) has been described as an example, this is for convenience of explanation, and the second coil (132), third coil (133), and fourth coil (134) may refer to the first coil (131).

[0044] control unit

[0045] The control unit can control the direction of the current by making the first switch (211), the second switch (212), the third switch (213), and the fourth switch (214) different from each other.

[0046] The control unit can wirelessly control the first switch (211), the second switch (212), the third switch (213), and the fourth switch (214). For example, the switches can be controlled via Bluetooth or Wi-Fi.

[0047] Referring to FIGS. 3 and 4, the control unit can control the switches to close the first switch (211) and the fourth switch (214) during a first time (t1). For example, power can be supplied from terminal A to terminal D by closing the first switch (211) and the fourth switch (214) during the first time (t1). When the first switch (211) and the fourth switch (214) are closed during the first time (t1), the current of the first coil (131) can flow in the first direction.

[0048] When power is supplied from terminal A to terminal D, N-pole magnetism can be generated in the first coil (131).

[0049] The control unit can control the switches so that the second switch (212) and the third switch (213) are closed during the second time (t2) after the first time (t1) has passed. For example, power can be supplied from terminal B to terminal C by closing the second switch (212) and the third switch (213) during the second time (t2). When the second switch (212) and the third switch (213) are closed after the first time (t1) has passed and during the second time (t2), the current of the first coil (131) can flow in a second direction opposite to the first direction.

[0050] When power is supplied from terminal B to terminal C, the first coil (131) may generate S-pole magnetism.

[0051] The magnetism of the North Pole and the South Pole are merely examples to explain that different magnetisms appear, and are not limited thereto.

[0052] The rotor (110) can magnetically interact with the magnet in the stator (120) by the current flowing in the first coil (131) in the first direction and the second direction at different timings. For example, when the first coil (131) of the rotating rotor (110) approaches the magnet of the stator (120), different magnetic poles (N-pole to S-pole) are formed, allowing the first coil (131) to approach the magnet of the stator (120) quickly. When the first coil (131) of the rotating rotor (110) moves away from the magnet of the stator (120), the same magnetic poles (N-pole to N-pole or S-pole to S-pole) are formed, allowing the first coil (131) to move away from the magnet of the stator (120) quickly. The rotation axis connected to the rotor (110) can rotate due to the electrical interaction between the stator (120) and the rotor (110). Electrical energy can be converted into mechanical energy by rotating the rotation axis (140).

[0053] The first time (t1) and the second time (t2) can be substantially the same. Since the first time (t1) and the second time (t2) are substantially the same, the rotational speed of the motor can be constant. Since the rotational speed of the motor is constant, the motor can supply stable mechanical energy to the user.

[0054] The operating time of the plurality of switches (210) may further include a third time (t3). During the third time (t3), the first switch (211), the second switch (212), the third switch (213), and the fourth switch (214) may all be opened. For example, during the third time (t3), current may not flow through the first coil (131).

[0055] The third time (t3) may be larger than the first time (t1) and the second time (t2). By making the third time (t3) larger than the first time (t1) and the second time (t2), the rotor (110) can rotate smoothly through magnetic interaction with the stator (121).

[0056] The control unit may further include an input unit, a receiving unit, and a speed control unit. The input unit may receive the rotational speed of the motor input by a user. The receiving unit may receive the rotational speed of the motor input by the input unit and transmit it to the speed control unit. The speed control unit may control the conversion cycle between the first time and the second time based on the rotational speed of the motor. As another example, the control unit may control the closing speed of the switch based on the conversion cycle between the first time and the second time stored in the memory unit.

[0057] The control of the first switch (211), the second switch (212), the third switch (213), and the fourth switch (214) can be controlled through a MOSFET.

[0058] The change in the direction of current flow of the aforementioned coil has been explained using the first coil (131) as an example, but is not limited thereto. The second coil (132), third coil (133), and fourth coil (134) may refer to the first coil (131).

[0059] The first stator (121) wound with the first coil (131) and the second stator (122) wound with the second coil (132) can form different stimuli. The third stator (123) wound with the third coil (133) and the second stator (122) wound with the second coil (132) can also form different stimuli. The fourth stator (124) wound with the fourth coil (134) can also be formed with different stimuli corresponding to the first coil (131), the second coil (132), and the third coil (133).

[0060] By eliminating the brush and converting the stimulus via a switch, maintenance and durability issues caused by brush damage can be resolved. For example, brush wear may not occur. Resolving the brush wear issue can reduce maintenance costs.

[0061] Unlike BLDC (brush-less direct current) motors that change the direction of current using Hall sensors, the motor of the present invention can have its configuration simplified by controlling the switching timing of the switch. For example, the cost of the motor of the present invention can be reduced by omitting the sensor. For example, complex feedback control based on the position of the rotor can be omitted by simply changing the direction of current through the switch.

[0063] Heat dissipation component (not shown)

[0064] The wireless motor (10) may further include a heat dissipation member. For example, a heat dissipation fan may be attached to the housing (100) of the wireless motor (10), and heat generated from the first switch (211), the second switch (212), the third switch (213), and the fourth switch (214) may be dissipated by the heat dissipation fan.

[0065] A heat dissipation member (not shown) may be attached to the stator. For example, the heat dissipation member may be attached to the rear surface of the first stator (121). As another example, the heat dissipation member may be positioned to surround the exterior of the first stator (121).

[0066] A wireless motor that changes polarity through a switch may have limitations in providing high-speed rotation compared to a standard BL wireless motor that changes polarity by identifying the position of the rotor through a sensor. To overcome these limitations, the wireless motor (10) may further include a high-speed gate driver IC. The control speed of the first switch (211), the second switch (212), the third switch (213), and the fourth switch (214) can be improved by the high-speed gate driver IC.

[0067] The wireless motor (10) can be electrically connected to a battery (not shown). The wireless motor (10) can be operated by receiving power from the battery. The battery can be charged by receiving power wirelessly. For example, the battery can be charged by at least one of magnetic induction (Inductive Coupling), magnetic resonance (Resonant Inductive Coupling), microwave power transmission, and laser power transmission.

[0068] Unlike conventional BLDC motors, the wireless motor (10) of the present invention can have its configuration simplified and manufacturing costs reduced by changing the polarity through a simple switch without a Hall sensor. In addition, maintenance can be easy due to the simple configuration.

[0069] Unlike conventional BLDC motors that basically consist of three stators, the wireless motor (10) of the present invention may have an even number of stators. For example, the wireless motor (10) of the present invention may be formed with four or eight stators.

[0070] Additionally, portability can be ensured by the wireless motor (10) being able to control the switch wirelessly and be wirelessly charged. For example, the wireless motor (10) can be controlled from a distance and charged from a distance via a wireless frequency for wireless supply and wireless control.

[0071] Unlike a general wireless motor, the wireless motor (10) of the present invention is By directly converting polarity using a switch, power loss is minimized, and the switch can be controlled without distance limitations. Additionally, the simplified configuration can reduce manufacturing costs and facilitate maintenance.

[0072] Since the wireless motor (10) is wirelessly supplied and wirelessly controlled, it can be used as an external power source for an artificial heart or in isolated spaces, such as a motor used underwater. Additionally, by controlling it from a distance, the user's portability and space limitations can be overcome.

[0073] The aforementioned wireless motor can be used in high-voltage power of 800V or higher, such as in automobiles.

[0074] The aforementioned wireless motor can be charged and rotated by receiving wireless power through electrical interaction with a road surface coil installed inside the road. A vehicle can be driven by the wireless motor that receives wireless power.

[0075] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0076] 10: Motor 100: Housing 110: Rotor 111: First magnet 112: The second magnet 120: Stator 121: First stator 122: Second stator 123: Third stator 124: 4th stator 130: Multiple coils 131: First coil 132: Second coil 133: Third coil 134: 4th coil 140: Rotation axis 150: Ball bearing 210: Multiple switches 211: 1st Switch 212: Second switch 213: Third Switch 214: 4th Switch

Claims

Claim 1 A wireless motor comprising: a housing forming the exterior of the motor; a rotor connected to a rotating shaft and rotating the rotating shaft and including at least one magnet; a stator fixed inside the housing; a plurality of coils wound on the stator; a first switch, a second switch, a third switch, and a fourth switch connected to one of the plurality of coils; and a control unit for controlling the first, second, third, and fourth switches, wherein the control unit closes the first switch and the third switch during a first time to control the current flowing on the one coil to flow in a first direction, and after the first time has passed, closes the second switch and the fourth switch during a second time to control the current flowing on the one coil to flow in a second direction opposite to the first direction, and the rotor magnetically interacts with the magnet of the rotor of the stator by changes in the current flowing in the first direction and the second direction, and the rotor rotates the rotating shaft through magnetic interaction with the at least one magnet. Claim 2 A wireless motor according to claim 1, wherein the first time and the second time are substantially the same, and the control unit further comprises: an input unit for inputting the rotational speed of the wireless motor; a receiver unit for receiving the input rotational speed signal; and a speed control unit for controlling the first time and the second time based on the received rotational speed, wherein the speed control unit controls the change cycle of the first time and the second time based on the rotational speed signal input by a user. Claim 3 A wireless motor according to claim 1, wherein the first switch and the fourth switch are closed during the first time, and when the first switch and the fourth switch are opened after the first time has elapsed, the first switch, the second switch, the third switch, and the fourth switch are opened during the third time, and when the third time has elapsed, the second switch and the third switch are closed during the second time, and the third time is longer than the first time and the second time. Claim 4 A wireless motor according to claim 1, further comprising: a heat dissipation member for dissipating heat generated from the first, second, third, and fourth switches; and a battery electrically connected to the plurality of coils and the control unit, wherein the heat dissipation member is attached to the stator and the battery is charged by at least one of a magnetic induction method, a long-term resonance method, a microwave method, or a laser method. Claim 5 A wireless motor according to claim 1, wherein the control unit further comprises a high-speed gate driver IC, and the high-speed gate driver IC controls the opening and closing cycles of the first and fourth switches and the opening and closing cycles of the second and third switches more quickly.

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