Motor with switchable working voltage

Abstract

The utility model discloses a working voltage switchable motor, which comprises a motor assembly, a rear end cover, a thermal protector assembly and a wiring board, the rear end cover is fixed at the rear end of the motor assembly, the thermal protector assembly and the wiring board are fixed in the rear end cover, and the motor assembly comprises a first winding and a second winding; the wiring board is provided with an insertion piece assembly, and the insertion piece assembly is used for connecting the first winding, the second winding, the thermal protector assembly and a connecting line of a motor power supply. The first winding and the second winding form a motor working loop with a motor power supply through an insertion piece assembly, and the insertion piece assembly is used for changing the series-parallel connection relation of the first winding and the second winding in the motor working loop; and the thermal protector assembly is connected in series in a working loop of the motor through the insertion piece assembly. The utility model provides the motor with the switchable working voltage, the working voltage of the motor can be switched, the generality of a product is improved, and overload protection is carried out on the motor.

Description

Technical Field

[0001] The utility model relates to a motor with a switchable working voltage, belonging to the technical field of motors. Background Art

[0002] At present, in the field of motors, as a bridge connecting the external power supply and the motor winding, the wiring board enables the motor to be powered through the connection between the insertion piece and the terminal, without the need to separately set up the motor lead wire to connect to the external power supply, which is convenient and fast. Moreover, the required voltage of the motor can even be switched by changing the insertion position of the wiring board to meet the usage in different countries and regions.

[0003] However, traditional wiring board components, such as the patent with the publication number US6040646A, provide a plug and a motor for changing the operating conditions of the motor. Although it can switch the working voltage of the motor, there are still the following problems: 1. It is necessary to separately mold a plastic plug and connect it to the stator winding; 2. The stator needs to be impregnated with paint and dried at high temperature, and the plastic plug may be deformed at high temperature; 3. This wiring board cannot be connected to a thermal protector, and the motor has no overload protection ability. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a motor with a switchable working voltage, which can switch the working voltage of the motor, improve the versatility of the product, and provide overload protection for the motor.

[0005] To solve the above technical problem, the technical solution of the utility model is as follows:

[0006] A motor with a switchable working voltage, which comprises a motor assembly, a rear end cover, a thermal protector assembly and a wiring board. The rear end cover is fixed to the rear end of the motor assembly. The thermal protector assembly and the wiring board are fixed inside the rear end cover. The motor assembly includes a first winding and a second winding;

[0007] The wiring board is provided with an insertion piece assembly, and the insertion piece assembly is used to connect the first winding, the second winding, the thermal protector assembly and the connecting wires of the motor power supply;

[0008] The first winding and the second winding form a motor working circuit with the motor power supply through the insertion piece assembly, and the insertion piece assembly is used to change the series-parallel relationship of the first winding and the second winding in the motor working circuit;

[0009] The thermal protector assembly is connected in series in the motor working circuit through the insertion piece assembly, and the thermal protector assembly is used to provide overload protection for the motor assembly.

[0010] Further, the insertion piece assembly includes a first transfer insertion piece, a second transfer insertion piece, a first power socket, a second power socket and an idle terminal placement hole installed through the wiring board.

[0011] Furthermore, the first power socket and the second power socket have the same structure. The first power socket includes a contact piece, on which a front insert piece and a back insert piece are provided. The contact piece and the back insert piece are both located on the back of the wiring board, and the front insert piece is located on the front of the wiring board. A fastening screw is provided on the contact piece.

[0012] Furthermore, a limit post is provided on the contact piece.

[0013] Furthermore, an isolation surface is provided on the back of the wiring board, and the isolation surface is used for electrically isolating the insert component.

[0014] Furthermore, a wire surface is provided on the side wall of the wiring board facing the wire outlet of the rear end cover, and the wire surface is an arc surface.

[0015] Furthermore, installation holes are provided at both ends of the wiring board, and isolation columns are provided on the front of the installation holes.

[0016] Furthermore, an annular boss is provided on the back of the installation hole.

[0017] Furthermore, a wire groove is provided on the end face of the wiring board, and the wire groove is located on the outer periphery of the annular boss.

[0018] Furthermore, a window is provided on the rear end cover.

[0019] By adopting the above technical solution, the utility model can use the insert component designed on the wiring board as a transfer to connect electrical components such as the motor component, the thermal protector component, and the motor power supply to form a motor working circuit. The series-parallel relationship of the motor windings can be changed by changing the connection positions of the wiring terminals of the first winding and the second winding with the insert component. The first winding and the second winding are switched between series and parallel, so that the working voltage of the motor is switched between 115V and 230V, and different national power requirements can be adapted. At the same time, a thermal protector component is added to the motor working circuit to protect the motor against overload and ensure the safety of the motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a motor with a switchable working voltage according to the utility model;

[0021] Figure 2 is a schematic structural diagram of the back of the wiring board according to the utility model;

[0022] Figure 3 is a schematic structural diagram of the front of the wiring board according to the utility model;

[0023] Figure 4Schematic diagram of the electrical isolation structure of the isolation column of the present utility model;

[0024] Figure 5 Schematic diagram of the installation structure of the wiring board of the present utility model;

[0025] Figure 6 Schematic diagram of the electrical isolation structure of the isolation surface of the present utility model;

[0026] Figure 7 Schematic diagram of the installation structure of the idle wiring terminal of the present utility model;

[0027] Figure 8 Schematic diagram of the partial structure on the back of the wiring board of the present utility model;

[0028] Figure 9 Schematic diagram of the partial structure on the front of the wiring board of the present utility model;

[0029] Figure 10 Schematic diagram of the guiding structure of the wire surface to the motor power line of the present utility model;

[0030] Figure 11 Schematic diagram of the window opening structure of the rear end cover of the present utility model;

[0031] Figure 12 Schematic diagram of the wiring of the 115V voltage of the present utility model;

[0032] Figure 13 Circuit schematic diagram of the motor working circuit of the 115V voltage of the present utility model;

[0033] Figure 14 Schematic diagram of the wiring of the 230V voltage of the present utility model;

[0034] Figure 15 Circuit schematic diagram of the motor working circuit of the 230V voltage of the present utility model. Detailed implementation manners

[0035] In order to make the content of the present utility model easier to be clearly understood, the present utility model will be further described in detail below according to specific embodiments and in conjunction with the accompanying drawings.

[0036] As Figure 1 shown, this embodiment provides a motor with a switchable working voltage, which includes a motor assembly 1, a rear end cover 2, a thermal protector assembly 3 and a wiring board 4. The rear end cover 2 is fixed to the rear end of the motor assembly 1, and the thermal protector assembly 3 and the wiring board 4 are fixed inside the rear end cover 2. The motor assembly 1 of this embodiment includes a first winding Q1 and a second winding Q2. After the motor power is turned on, the first winding Q1 and the second winding Q2 are energized to drive the rotor of the motor assembly 1 to rotate.

[0037] As Figure 12 、 14 shown, the power strip 4 of this embodiment is provided with a blade assembly, and the blade assembly is used to connect the first winding Q1, the second winding Q2, the thermal protector assembly 3 and the connecting wires of the motor power supply.

[0038] The first winding Q1 and the second winding Q2 form a motor working circuit with the motor power supply through the blade assembly, and the blade assembly is used to change the series-parallel relationship of the first winding Q1 and the second winding Q2 in the motor working circuit. The thermal protector assembly 3 is connected in series in the motor working circuit through the blade assembly, and the thermal protector assembly 3 is used to protect the motor assembly 1 against overload.

[0039] As Figure 2 、 3 shown in 8, 9, the blade assembly of this embodiment includes a first transfer blade 51, a second transfer blade 52, a first power socket 61, a second power socket 62 and an idle terminal placement hole 63 that are installed through the power strip 4.

[0040] Among them, the first transfer blade 51 and the second transfer blade 52 have the same structure. Each transfer blade penetrates through the power strip 4, and the terminals of the connecting wires can be plugged into the first transfer blade 51 and the second transfer blade 52. The parts of each transfer blade located on the front and back of the power strip 4 can be plugged with the terminals of the connecting wires.

[0041] The first power socket 61 and the second power socket 62 have the same structure. The first power socket 61 includes a contact piece 611. The contact piece 611 is provided with a front blade 612 and a back blade 613. The contact piece 611 and the back blade 613 are both located on the back of the power strip 4, and the front blade 612 is located on the front of the power strip 4. The contact piece 611 is provided with a fastening screw 614 and a limiting post 615. The terminals of the connecting wires can be plugged into the front blade 612 and the back blade 613. In order to adapt to different-shaped terminals, if a round terminal or a U-shaped terminal needs to be used, first loosen the fastening screw 614, then insert the terminal between the contact piece 611 and the fastening screw 614, and finally tighten the fastening screw 614. The function of the limiting post 615 is to prevent the terminals from intersecting and causing a short circuit during the installation process, thus ensuring safety.

[0042] The function of the idle terminal placement hole 63 is that when switching the voltage, there will be an extra idle terminal 631, which is used to place this terminal. The idle terminal placement hole 63 and the injection molded body of the power strip 4 adopt an integrated structure, which can be integrally formed during the injection molding process, without adding an extra blade as a placement position, which can reduce the production process steps and save costs.

[0043] The method for the motor of this embodiment to switch the working voltage is as follows:

[0044] As Figure 12 shown, this figure is the wiring method for 115V voltage. The dotted line is the front-side wiring method of the wiring board 4, and the solid line is the back-side connection method of the wiring board 4. Figure 13 It is the circuit schematic diagram of the motor working circuit for 115V voltage. The M1 position of the first winding Q1 is connected to the first transfer insert 51 on the front side of the wiring board 4, the M2 position of the first winding Q1 is connected to the front insert 612 of the first power socket 61, and the I position of the thermal protector assembly 3 is connected to the front insert 612 of the second power socket 62; the N1 position of the second winding Q2 is connected to the second transfer insert 52 on the front side of the wiring board 4, the II position of the thermal protector assembly 3 is connected to the first transfer insert 51 on the back side of the wiring board 4, the N2 position of the second winding Q2 is connected to the back insert 613 of the first power socket 61, the contacts 611 of the first power socket 61 and the second power socket 62 are connected to the 115V motor power supply, and the III position of the thermal protector assembly 3 is connected to the second transfer insert 52 on the back side of the wiring board 4.

[0045] As Figure 14 shown, this figure is the wiring method for 230V voltage. The dotted line is the front-side wiring method of the wiring board 4, and the solid line is the back-side connection method of the wiring board 4. Figure 15 It is the circuit schematic diagram of the motor working circuit for 230V voltage. When the motor needs to switch to the 230V mode, connect the N2 position of the second winding Q2 to the first transfer insert 51 on the back side of the wiring board 4, and insert the terminal at the II position of the thermal protector assembly 3 into the idle terminal placement hole 63. In this way, the switching between 115V and 230V working voltages can be realized, enabling the motor to be applicable in more countries and regions without being unable to work due to different voltages.

[0046] Figure 12 and Figure 14 The working principle of the thermal protector assembly 3 in is: when the motor is overloaded and running, the heater in the thermal protector assembly 3 starts to heat up. When the temperature reaches the threshold, the metal spring piece 31 pops open, disconnecting the motor power supply to protect the motor.

[0047] As Figure 2 、 3 shown, both ends of the wiring board 4 in this embodiment are provided with mounting holes 43, and a circular boss 45 is provided on the back side of the mounting holes 43. There are two circular bosses 45 designed on the wiring board 4. During installation, the shape of the circular boss 45 is adapted to the shape of the mounting post 23 on the rear end cover 2. As Figure 5As shown, the annular boss 45 is used to cooperate with the mounting post 23 of the rear end cover 2 for positioning when installing the wiring board 4. Then, screws are inserted from the front of the wiring board 4 into the mounting post 23 of the rear end cover 2. There is a thread in the hole of the mounting post 23, so that the wiring board 4 and the rear end cover 2 can be tightly connected together. The annular boss 45 plays a positioning role during installation, making it convenient and fast to drive in the screws later and improving production efficiency.

[0048] As Figure 3 shown, an isolation post 44 is provided on the front of the mounting hole 43 of this embodiment. As Figure 4 shown, the isolation post 44 is to separate the screws and the wiring terminals in the mounting hole 43 for electrical isolation, preventing dangerous situations such as electric arcs or sparks from occurring between the screws and the wiring terminals during the operation of the motor.

[0049] As Figure 2 shown, an isolation surface 41 is provided on the back of the wiring board 4 of this embodiment. The isolation surface 41 is used for electrical isolation of the insert component. As Figure 6 shown, in the position boxed in the figure, the rear end cover 2 is too close to the insert and the screws. To prevent dangerous situations such as electric arcs or sparks from occurring between the wiring terminals and the rear end cover 2 and the screws during the operation of the motor. The isolation surface 41 can also be used as a reinforcing rib to improve the strength of the wiring board 4. Therefore, the isolation surface 41 and the isolation post 44 are designed on the wiring board 4 to ensure the safety of the motor operation.

[0050] As Figure 2 、 3 shown, a wire surface 42 is provided on the side wall of the wiring board 4 facing the wire outlet 21 of the rear end cover 2 in this embodiment. The wire surface 42 is an arc surface. As Figure 10 shown, an arc-shaped wire surface 42 is designed on one side of the wiring board 4 facing the wire outlet 21 of the rear end cover 2. After the wiring board 4 is installed, the worker needs to insert the motor power cord 11 through the wire outlet 21 and connect it to the first power socket 61 and the second power socket 62 on the wiring board 4. When the worker inserts the motor power cord 11 into the wire outlet 21, the arc-shaped wire surface 42 on the wiring board 4 can guide the connection terminal to the first power socket 61 and the second power socket 62 on the wiring board 4, avoiding the uncertainty of the wire insertion position during installation and preventing the connection terminal from reaching the wire coil of the motor assembly 1 during installation. The connection terminal may scratch the enameled wire, resulting in motor failure. With this wire surface 42, the installation difficulty can be reduced, the installation time can be shortened, and damage to the motor during installation can be avoided, thereby indirectly reducing costs.

[0051] As Figure 2 shown, a wire groove 46 is provided on the end face of the wiring board 4 in this embodiment. The wire groove 46 is located on the outer periphery of the annular boss 45. As Figure 9As shown in the figure, a wire groove 46 is designed on the right end face of the wiring board 4. During installation, first, the thermal protector assembly 3 is installed on the rear end cover 2 through the mounting posts and screws on the rear end cover 2. Then, the thermal protector assembly 3 is connected to the blade assembly on the wiring board 4 through the thermal protector connecting wire 32. After that, the wiring board 4 is installed on the rear end cover 2 through the mounting posts 23 and screws. When installing the wiring board 4, it is necessary to insert the thermal protector connecting wire 32 on the thermal protector assembly 3 into the wire groove 46 on the wiring board 4. This wire groove 46 can prevent the thermal protector connecting wire 32 from blocking the threaded holes of the mounting posts 23 on the rear end cover 2, resulting in the inability to insert the screws or damage the thermal protector connecting wire during the installation of the rear end cover 2, which may cause a short circuit. This can not only reduce the installation difficulty, shorten the installation time, but also reduce the probability of failure.

[0052] As Figure 11 shown, a window 22 is provided on the rear end cover 2 of this embodiment. The window 22 on the rear end cover 2 is for facilitating the voltage switching operation of the motor. When switching the voltage, there is no need to disassemble the entire rear end cover 2 and then connect the wires.

[0053] In the specific embodiments described above, the technical problems solved, technical solutions, and beneficial effects of the present invention have been further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, 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 motor with switchable working voltage, characterized in that: It comprises a motor assembly (1), a rear end cover (2), a thermal protector assembly (3) and a terminal block (4); the rear end cover (2) is fixed at the rear end of the motor assembly (1); the thermal protector assembly (3) and the terminal block (4) are fixed inside the rear end cover (2); the motor assembly (1) comprises a first winding (Q1) and a second winding (Q2); The wiring board (4) is provided with a plug assembly, and the plug assembly is used to connect the first winding (Q1), the second winding (Q2), the thermal protector assembly (3) and the connecting wire of the motor power supply; The first winding (Q1) and the second winding (Q2) form a motor working circuit with a motor power supply through a plug-in assembly, and the plug-in assembly is used to change the series-parallel relationship between the first winding (Q1) and the second winding (Q2) in the motor working circuit; The thermal protector component (3) is connected in series in the motor working circuit via a plug-in component, and the thermal protector component (3) is used to provide overload protection for the motor component (1).

2. The motor with switchable working voltage according to claim 1, characterized in that: The plug assembly comprises a first transfer plug (51), a second transfer plug (52), a first power socket (61), a second power socket (62) and an idle terminal placement hole (63) installed through the wiring board (4).

3. The motor with switchable working voltage according to claim 2, characterized in that: The first power socket (61) and the second power socket (62) have the same structure. The first power socket (61) comprises a contact piece (611). The contact piece (611) is provided with a front plug piece (612) and a back plug piece (613). The contact piece (611) and the back plug piece (613) are both located on the back side of the wiring board (4). The front plug piece (612) is located on the front side of the wiring board (4). The contact piece (611) is provided with a fastening screw (614).

4. The motor with switchable working voltage according to claim 3, characterized in that: A limiting column (615) is arranged on the contact piece (611).

5. The motor with switchable working voltage according to claim 1, characterized in that: An isolation surface (41) is provided on the back of the wiring board (4), and the isolation surface (41) is used to electrically isolate the plug-in assembly.

6. The motor with switchable working voltage according to claim 1, characterized in that: A conductor surface (42) is provided on the side wall of the wire outlet (21) of the wiring board (4) facing the rear end cover (2), and the conductor surface (42) is an arc surface.

7. The motor with switchable working voltage according to claim 1, characterized in that: Mounting holes (43) are provided at both ends of the wiring board (4), and isolation columns (44) are provided on the front sides of the mounting holes (43).

8. The motor with switchable working voltage according to claim 7, characterized in that: An annular boss (45) is provided on the back side of the mounting hole (43).

9. The motor with switchable working voltage according to claim 8, characterized in that: The end surface of the wiring board (4) is provided with a wire groove (46), and the wire groove (46) is located on the outer periphery of the annular boss (45).

10. The motor with switchable working voltage according to claim 1, characterized in that: The rear end cover (2) is provided with a window (22).

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