A forward and reverse motor with improved forward and reverse efficiency and a control method thereof

Abstract

The present invention provides a forward and reverse motor and a control method thereof for improving forward and reverse efficiency. A forward and reverse motor having a first winding, a second winding and a third winding, both of which have a phase difference of 90 degrees with the first winding, and a switching circuit is used, and the switching circuit connects the first winding as a main winding and the second winding as a secondary winding into the working circuit of the motor; or connects the third winding as a main winding and the first winding as a secondary winding into the working circuit of the motor, so that when the motor rotates forward or reverse, the parameters such as the number of turns, wire diameter and resistance of the main winding and the secondary winding under respective circumstances can be designed respectively, so as to ensure that the motor can obtain high efficiency in both forward and reverse rotation, and solves the problem that the forward and reverse motor in the related art cannot achieve high efficiency in both forward and reverse directions.

Description

Technical Field

[0001] The present invention relates to the field of motor control, and in particular to a forward and reverse motor capable of improving forward and reverse efficiency and a control method thereof. Background Art

[0002] Currently, most single-phase capacitor-operated asynchronous AC motors (referred to as motors) can only rotate in one direction and cannot be used in situations where both forward and reverse rotation are required.

[0003] A forward and reverse control circuit is disclosed in the related technology, in which the forward and reverse motor includes two windings with a phase difference of 90 degrees. When the motor rotates forward and reverse, the two windings switch between the main winding (also called the running winding) and the auxiliary winding (also called the starting winding) to provide a forward starting angle or a reverse starting angle for the motor. Figure 1 It is a circuit topology diagram of a forward and reverse motor system according to related technology.

[0004] Figure 1 The single-phase asynchronous motor shown has two sets of windings, one set is the main winding and the other set is the secondary winding. When winding L1 is the main winding and L2 is the secondary winding, the motor rotates forward. When winding L2 is the main winding and L1 is the secondary winding, the motor rotates reversely. When the motor is selected to rotate forward, winding L1 is connected to the working circuit as the main winding, and winding L2 is connected to the working circuit as the secondary winding (the winding connected in series with the running capacitor is the secondary winding) to achieve the forward rotation effect. When the motor is selected to rotate reversely, winding L2 is connected to the working circuit as the main winding, and winding L1 is connected to the working circuit as the secondary winding (the winding connected in series with the running capacitor is the secondary winding) to achieve the reverse effect. The current flow in the forward and reverse states is as follows Figure 2 and Figure 3 shown.

[0005] However, in a single-phase asynchronous motor, the rotation of the motor rotor is mainly provided by the main winding. The number of turns, wire diameter and resistance of the main winding, as well as the number of turns, wire diameter and resistance of the secondary winding, will affect the motor efficiency. Figure 1 In the forward and reverse motor shown, it is assumed that the motor efficiency can reach the optimal level through the design of the main winding L1 and the auxiliary winding L2; when the motor reverses, the winding L2 acts as the main winding and the winding L1 acts as the auxiliary winding, that is, the number of turns, wire diameter and resistance of the main and auxiliary windings change at the same time, and the motor efficiency cannot reach the optimal level at this time.

[0006] It can be seen that the solution of the above patent application can be applied to occasions where the motor efficiency is not high. When the application requires that the motor should achieve a certain efficiency in both forward and reverse directions, the above solution cannot take both into account. The above solution can only ensure that the efficiency in one direction is optimal, and the efficiency in the other direction needs to be sacrificed, so it cannot meet the requirement of high efficiency in both forward and reverse directions. Summary of the invention

[0007] The present invention provides a forward and reverse motor with improved forward and reverse efficiency and a control method thereof, so as to at least solve the problem in the related art that the forward and reverse motor cannot achieve high efficiency in both forward and reverse directions.

[0008] In a first aspect, an embodiment of the present invention provides a forward and reverse motor, comprising: a first winding, a second winding, a third winding and a switching circuit, wherein the phase difference between the first winding and the second winding is 90 degrees, and the phase difference between the first winding and the third winding is also 90 degrees, wherein:

[0009] The switching circuit is used to connect the first winding as the main winding and the second winding as the auxiliary winding into the working circuit of the motor; or to connect the third winding as the main winding and the first winding as the auxiliary winding into the working circuit of the motor.

[0010] Optionally, the switching circuit includes: a first switch, a second switch, a third switch and a fourth switch, wherein:

[0011] One end of the first winding is connected to the live wire terminal, and the other end is connected to the first neutral wire terminal via the first switch;

[0012] One end of the second winding is connected to the live wire terminal, and the other end is connected to the second neutral wire terminal via the fourth switch and the second switch connected in series in sequence;

[0013] One end of the third winding is connected to the live wire terminal, and the other end is connected to the second neutral wire terminal via the third switch and the second switch connected in series in sequence;

[0014] A first node where the second switch and the third switch are connected is connected to a first terminal of a running capacitor of the motor;

[0015] A second node where the first switch is connected to the first winding is connected to a second terminal of the running capacitor.

[0016] Optionally, the first switch, the second switch, the third switch and the fourth switch are all electromagnetic relay switches.

[0017] In a second aspect, an embodiment of the present invention provides a control method for a forward and reverse motor, comprising: after the motor is powered on, controlling the switching circuit to connect the first winding as the main winding and the second winding as the auxiliary winding into the working circuit of the motor.

[0018] Optionally, controlling the switching circuit to connect the first winding as a main winding and the second winding as a secondary winding into the working circuit of the motor comprises:

[0019] The first switch and the fourth switch are controlled to be closed, and the second switch and the third switch are controlled to be opened, so as to start the motor.

[0020] Optionally, the method further comprises:

[0021] After the motor is powered on, the switching circuit is controlled to connect the third winding as the main winding and the first winding as the auxiliary winding into the working circuit of the motor.

[0022] Optionally, controlling the switching circuit to connect the third winding as a main winding and the first winding as a secondary winding into the working circuit of the motor comprises:

[0023] The second switch and the third switch are controlled to be closed, and the first switch and the fourth switch are controlled to be opened, so as to start the motor.

[0024] Optionally, the method further comprises:

[0025] After the motor is running, the auxiliary winding is controlled to exit the working loop of the motor.

[0026] In a third aspect, an embodiment of the present invention provides a control device for a forward and reverse motor, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, and when the computer program instructions are executed by the processor, the method described in the second aspect is implemented.

[0027] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having computer program instructions stored thereon, which implement the method described in the second aspect when the computer program instructions are executed by a processor.

[0028] The forward and reverse motor, the control method, device and medium of the forward and reverse motor provided by the embodiments of the present invention adopt a forward and reverse motor having a first winding and a second winding and a third winding with a phase difference of 90 degrees with the first winding, and a switching circuit. The switching circuit connects the first winding as the main winding and the second winding as the auxiliary winding into the working circuit of the motor; or connects the third winding as the main winding and the first winding as the auxiliary winding into the working circuit of the motor, so as to ensure that when the motor rotates forward or reverse, the parameters such as the number of turns, wire diameter and resistance of the main winding and the auxiliary winding in each case can be designed separately to ensure that the motor can achieve high efficiency in both forward and reverse rotation, thereby solving the problem that the forward and reverse motor in the related art cannot achieve high efficiency in both forward and reverse directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 It is a circuit topology diagram of a forward and reverse motor system according to the related art;

[0031] Figure 2 This is a schematic diagram of the current flow direction of the forward and reverse motor system according to the related art. Figure 1 ;

[0032] Figure 3 This is a schematic diagram of the current flow direction of the forward and reverse motor system according to the related art. Figure 2 ;

[0033] Figure 4 is a circuit topology diagram of a forward and reverse motor according to an embodiment of the present invention;

[0034] Figure 5 is a circuit topology diagram of a forward and reverse motor system according to an embodiment of the present invention;

[0035] Figure 6 Schematic diagram of the current flow direction of the forward and reverse motor system according to an embodiment of the present invention Figure 1 ;

[0036] Figure 7 Schematic diagram of the current flow direction of the forward and reverse motor system according to an embodiment of the present invention Figure 2 ;

[0037] Figure 8 Schematic diagram of the hardware structure of a control device for a forward and reverse motor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0040] In this embodiment, a forward and reverse motor is provided. Figure 4 1 is a circuit topology diagram of a forward and reverse motor according to an embodiment of the present invention. Figure 4 As shown, the forward and reverse circuit of this embodiment includes: a first winding L1, a second winding L2, a third winding L3 and a switching circuit X, wherein the phase difference between the first winding L1 and the second winding L2 is 90 degrees, and the phase difference between the first winding L1 and the third winding L3 is also 90 degrees, wherein the switching circuit X is used to connect the first winding L1 as the main winding and the second winding L2 as the auxiliary winding to the working circuit of the motor; or connect the third winding L3 as the main winding and the first winding L1 as the auxiliary winding to the working circuit of the motor.

[0041] The circuit structure of the switching circuit X is not unique, and any circuit structure that can realize connecting the first winding L1 as the main winding and the second winding L2 as the auxiliary winding to the working circuit of the motor, or connecting the third winding L3 as the main winding and the first winding L1 as the auxiliary winding to the working circuit of the motor can be conceived. In this embodiment, a basic switching circuit structure is provided to realize the above functions.

[0042] Optionally, the switching circuit X includes: a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4, wherein one end of the first winding L1 is connected to the live wire terminal L, and the other end is connected to the first neutral wire terminal N1 via the first switch K1; one end of the second winding L2 is connected to the live wire terminal L, and the other end is connected to the second neutral wire terminal N2 via the fourth switch K4 and the second switch K2 connected in series; one end of the third winding L3 is connected to the live wire terminal L, and the other end is connected to the second neutral wire terminal N2 via the third switch K3 and the second switch K2 connected in series; the first node where the second switch K2 and the third switch K3 are connected is connected to the first terminal A1 of the running capacitor of the motor; the second node where the first switch K1 and the first winding L1 are connected is connected to the second terminal A2 of the running capacitor.

[0043] Optionally, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are all electromagnetic relay switches. These electromagnetic relay switches are controlled by a controller; the controller may be a controller on the motor mainboard.

[0044] In this embodiment, a control method for a forward and reverse motor is also provided. The control method is used to control Figure 4 The forward and reverse motor is shown. Figure 5 is a circuit topology diagram of the forward and reverse motor system of an embodiment of the present invention. Figure 5 The mainboard and running capacitor C are also shown. Figure 5 The control part of K1~K4 by the mainboard is omitted, but this part exists in the actual circuit structure.

[0045] The control method of the forward and reverse motor of this embodiment is preferably executed by the main board, and includes the following steps:

[0046] Step 1: After the motor is powered on, the switching circuit connects the first winding as the main winding and the second winding as the auxiliary winding into the working circuit of the motor. Figure 4 In the forward and reverse motor shown, the first switch K1 and the fourth switch K4 are controlled to be closed, and the second switch K2 and the third switch K3 are controlled to be opened, so as to start the motor.

[0047] After the above control process, the current is Figure 6 The situation shown is flow, at this time the winding L1 is used as the main winding, L2 is used as the auxiliary winding, and the motor rotates clockwise, that is, the motor rotates forward.

[0048] Step 2: After the motor is powered on, the switching circuit connects the third winding as the main winding and the first winding as the auxiliary winding into the working circuit of the motor. Figure 4 In the forward and reverse motor shown, the second switch K2 and the third switch K3 are controlled to be closed, and the first switch K1 and the fourth switch K4 are controlled to be opened, so as to start the motor.

[0049] After the above control process, the current is Figure 7 The situation shown is flow, at this time the winding L3 acts as the main winding, L1 acts as the auxiliary winding, and the motor rotates counterclockwise, that is, the motor reverses.

[0050] After the motor is running, the auxiliary winding can continue to work, and together with the main winding, provide power to the rotor to improve the power factor of the motor. In some embodiments, the auxiliary winding can also be controlled to exit the working loop of the motor, and only the main winding provides power to the rotor.

[0051] It should be noted that the order of the above steps 1 and 2 can be swapped, that is, the motor can rotate forward first and then reverse, or reverse first and then forward, and no matter when rotating forward or reverse, the optimal motor efficiency can be achieved by designing the number of turns, wire diameter and resistance value of L1~L3.

[0052] In addition, the control method of the forward and reverse motor of the embodiment of the present invention can be implemented by a control device of the forward and reverse motor, and the control device of the forward and reverse motor is preferably arranged Figure 7 shown on the motherboard. Figure 8 A schematic diagram of the hardware structure of a control device for a forward and reverse motor provided in an embodiment of the present invention is shown.

[0053] The control device of the forward and reverse motor may include a processor 81 and a memory 82 storing computer program instructions.

[0054] Specifically, the processor 81 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0055] The memory 82 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 82 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory 82 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 82 may be inside or outside the data processing device. In a specific embodiment, the memory 82 is a non-volatile solid-state memory. In a specific embodiment, the memory 82 includes a read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0056] The processor 81 implements any one of the forward and reverse motor control methods in the above embodiments by reading and executing computer program instructions stored in the memory 82 .

[0057] In one example, the control device for the forward and reverse motor may further include a communication interface 83 and a bus 80. Figure 8As shown, the processor 81, the memory 82, and the communication interface 83 are connected via a bus 80 and communicate with each other.

[0058] The communication interface 83 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiment of the present invention.

[0059] Bus 80 includes hardware, software or both, and the parts of the control device of the forward and reverse motor are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 80 may include one or more buses. Although the embodiment of the present invention describes and shows a specific bus, the present invention considers any suitable bus or interconnection.

[0060] In addition, in combination with the control method of the forward and reverse motor in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any of the control methods of the forward and reverse motor in the above embodiment is implemented.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A forward and reverse motor, characterized in that include: A first winding, a second winding, a third winding and a switching circuit, the phase difference between the first winding and the second winding is 90 degrees, the phase difference between the first winding and the third winding is 90 degrees, wherein, The switching circuit is used to connect the first winding as the main winding and the second winding as the auxiliary winding into the working circuit of the motor; or to connect the third winding as the main winding and the first winding as the auxiliary winding into the working circuit of the motor.

2. The forward and reverse motor according to claim 1, characterized in that: The switching circuit includes: a first switch, a second switch, a third switch and a fourth switch, wherein: One end of the first winding is connected to the live wire terminal, and the other end is connected to the first neutral wire terminal via the first switch; One end of the second winding is connected to the live wire terminal, and the other end is connected to the second neutral wire terminal via the fourth switch and the second switch connected in series in sequence; One end of the third winding is connected to the live wire terminal, and the other end is connected to the second neutral wire terminal via the third switch and the second switch connected in series in sequence; A first node where the second switch and the third switch are connected is connected to a first terminal of a running capacitor of the motor; A second node where the first switch is connected to the first winding is connected to a second terminal of the running capacitor.

3. The forward and reverse motor according to claim 2, characterized in that: The first switch, the second switch, the third switch and the fourth switch are all electromagnetic relay switches.

4. A control method for a forward and reverse motor according to any one of claims 2 to 3, characterized in that include: After the motor is powered on, the switching circuit is controlled to connect the first winding as the main winding and the second winding as the auxiliary winding into the working circuit of the motor.

5. The control method according to claim 4, characterized in that: Controlling the switching circuit to connect the first winding as a main winding and the second winding as a secondary winding into the working circuit of the motor comprises: The first switch and the fourth switch are controlled to be closed, and the second switch and the third switch are controlled to be opened, so as to start the motor.

6. The control method according to claim 4, characterized in that: The method further comprises: After the motor is powered on, the switching circuit is controlled to connect the third winding as the main winding and the first winding as the auxiliary winding into the working circuit of the motor.

7. The control method according to claim 6, characterized in that: Controlling the switching circuit to connect the third winding as the main winding and the first winding as the auxiliary winding into the working circuit of the motor comprises: The second switch and the third switch are controlled to be closed, and the first switch and the fourth switch are controlled to be opened, so as to start the motor.

8. The control method according to any one of claims 4 to 7, characterized in that: The method further comprises: After the motor is running, the auxiliary winding is controlled to exit the working loop of the motor.

9. A control device for a forward and reverse motor, characterized in that: include: At least one processor, at least one memory and computer program instructions stored in the memory, which implement the method according to any one of claims 4 to 8 when the computer program instructions are executed by the processor.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 4 to 8 is implemented.

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