A motor with a reverse switch

Abstract

This invention provides a motor with a built-in reversing switch, relating to the field of motor technology. It includes a motor body and further comprises: a power supply terminal group, including multiple first terminals for electrically connecting each phase of the power supply, with at least two first terminals respectively electrically connected to second terminals; a motor side terminal group, including motor terminals for electrically connecting the motor body; and a switching device for electrically connecting the power supply terminal group and the motor side terminal group, configured to switch between the first terminals and the second terminals. When adjusting the direction of rotation, this invention eliminates the need to open the junction box cover to disconnect wiring; only the operating handle needs to be controlled. This simplifies operation and saves time. Furthermore, the use of a switching device in conjunction with the power supply terminal group and the motor side terminal group provides wider and more convenient wiring options.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to an electric motor with a built-in reversing switch. Background Technology

[0002] Electric motors have a wide range of applications. They convert electrical energy into rotational kinetic energy output and are found in almost every aspect of life, from small household exhaust hoods to large factory machinery. They are categorized by voltage level, including AC 220V, 380V, 6000V, and DC motors, with 380V AC motors being the most widely used.

[0003] For most mechanical equipment, the motor is required to have a fixed direction of rotation, that is, to rotate in a specified direction and not to rotate in the opposite direction. Adjusting the direction of rotation of the motor is accomplished by adjusting the phase sequence of the motor wiring, which is called phase adjustment.

[0004] In the prior art, the motor has a junction box 9, and the junction box contains a terminal block 10. The terminal block is an insulating plate fixed to the motor. The insulating plate has a power supply side terminal block 6 and a motor side terminal block 7. These two terminals are connected by a connecting piece 8 (copper sheet). The motor lead wire is connected to the motor side terminal block, and the power supply wire passes through the wiring port on the junction box and is connected to the power supply side terminal block.

[0005] Newly installed motors, as well as new motors replaced after burnout, may experience reverse rotation during the initial wiring. In such cases, the usual practice is to reverse the phase. This involves disconnecting the motor from the power supply, opening the junction box, and swapping any two of the three power wires from the external power source. This will correct the rotation direction. Alternatively, the phase can be reversed in the power switch supplying the motor. After the rotation is corrected, the motor should run normally. (See reference...) Figure 8-10 Wiring diagram for motor phase adjustment.

[0006] Therefore, there are two main problems to be solved in the existing technology: one is the inconvenience of adjusting the direction, and the other is the difficulty of wiring the terminals.

[0007] 1. Difficulty in adjusting steering. For example... Figure 8-10As shown, if the circuit reverses, it often requires reopening the motor's junction box cover, unscrewing the bolts on the terminals, swapping any two power wires (phase switching), and then restoring the circuit. Because the motor junction box is small and has limited internal space, the power wires are easily damaged during the phase switching process. Of course, phase switching can also be done inside the motor's power switch, but this is equally cumbersome, and after phase switching inside the switch, that switch cannot be used interchangeably with other switches (swapping them will result in reverse circuits). Therefore, phase switching is generally performed inside the motor's junction box. Furthermore, many modern motor power switches are equipped with integrated protection devices. For protection purposes, phase switching is not allowed inside the switch; otherwise, the integrated protection device will display a wiring error and will not allow the circuit to be closed and power to be supplied.

[0008] 2. Difficulty in wiring terminals. The space in the motor terminal box is generally very small. If the power cord is thicker and stiffer, the power cord will be very crowded inside the terminal box, resulting in high mechanical stress. This is especially true for some small motors, where the terminals and bolts inside the terminal box are very small. If the bolt tightness is not properly controlled, the terminals can easily be damaged, and the power cord can easily come loose, causing a short circuit or grounding, affecting equipment operation, or even damaging the equipment.

[0009] It should be noted that some motors require alternating rotation in two directions during operation, such as winches, electric hoists, elevators, etc. Even so, the phase sequence needs to be adjusted. That is to say, the direction of the motor rotation must correspond to the original marking. For example, if the motor is operated to run upward, it must actually run upward. You cannot operate it to run upward but actually run it downward.

[0010] Another situation is that it doesn't matter which direction the electric motor rotates, for mechanical equipment. For example, the electric motor of a piston pump can work normally in either direction, and there is no direction restriction. Summary of the Invention

[0011] The purpose of this invention is to provide a motor with a built-in reversing switch, which can solve the problems of inconvenient adjustment of direction and difficulty in wiring the terminals; The present invention provides an electric motor with a built-in reversing switch, comprising an electric motor body, and further comprising: a power supply side terminal group, including a plurality of first terminals for electrically connecting each phase of the power supply, and at least two of the first terminals being electrically connected to second terminals respectively; a motor side terminal group, including motor terminals for electrically connecting the electric motor body; and a switching device for electrically connecting the power supply side terminal group and the motor side terminal group, and the switching device being configured to switch between the first terminals and the second terminals.

[0012] Furthermore, there is a gap between the first terminal and the second terminal, and the switching device is configured to switch between the first terminal, the gap, and the second terminal.

[0013] Furthermore, the switching device includes a plurality of moving contacts, which are electrically connected to the motor terminals of the power supply side terminal group, and are also electrically connected to the first or second terminal of the motor side terminal group.

[0014] Furthermore, the power supply has phase A and phase C. The power supply side terminal group includes a first terminal and a second terminal electrically connected to phase A of the power supply, and the power supply side terminal group includes a first terminal and a second terminal electrically connected to phase C of the power supply.

[0015] Furthermore, the first terminal connecting phase A of the power supply is located between the second terminal connecting phase A of the power supply and the second terminal connecting phase C of the power supply; the second terminal connecting phase A of the power supply is located between the first terminal connecting phase C of the power supply and the first terminal connecting phase A of the power supply.

[0016] Furthermore, the motor body includes an A-phase winding and a C-phase winding, and the motor-side terminal group includes a motor terminal electrically connected to the A-phase winding and a motor terminal electrically connected to the C-phase winding; the switching device includes a first moving contact and a second moving contact; one end of the first moving contact is electrically connected to the motor terminal of the A-phase winding, and the other end is electrically connected to the first terminal of the A-phase power supply or the second terminal of the C-phase power supply; one end of the second moving contact is electrically connected to the motor terminal of the C-phase winding, and the other end is electrically connected to the first terminal of the C-phase power supply or the second terminal of the A-phase power supply.

[0017] Furthermore, the power supply also includes a B phase, and the power supply side terminal group includes a first terminal and a second terminal electrically connected to the B phase of the power supply; the motor body also includes a B phase winding, and the motor side terminal group includes a motor terminal electrically connected to the B phase winding; the switching device includes a third moving contact, one end of which is electrically connected to the motor terminal of the B phase winding, and the other end is electrically connected to either the first terminal or the second terminal of the B phase of the power supply.

[0018] Furthermore, it also includes a switch box, in which the power supply side terminal group, the motor side terminal group, and the switching device are integrated.

[0019] Furthermore, an operating lever is rotatably connected to the switch box, and the operating lever is drively connected to the switch device. One end of the operating lever extends out of the switch box and is detachably connected to an operating handle.

[0020] Furthermore, the end of the operating lever extending out of the switch box has a semi-circular cross-section, and the operating handle is provided with a semi-circular slot, into which the semi-circular end of the operating lever is inserted.

[0021] The beneficial effects of the technical solution of the present invention are as follows: First, adjusting the steering is convenient. Since adjusting the steering eliminates the need to open the junction box cover to disconnect the wiring, only the operating handle needs to be controlled. This not only simplifies operation and saves time but also avoids problems such as damage to the power cord during wiring disconnection.

[0022] Secondly, wiring is convenient. The terminals inside the motor junction box, especially for small motors, are very small. If the power cord is thick, it is often difficult to tighten. In addition, the thin terminals can easily damage the bolts. This invention solves this problem by using a switching device in conjunction with the power supply side terminal group and the motor side terminal group.

[0023] Third, work safety. The reversing switch has a stop position. When repairing motors or mechanical equipment, the reversing switch operating handle is turned to the stop position. Even if the motor is suddenly powered on, the motor will not turn, which increases the safety of the workers. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is an external schematic diagram of the present invention, showing the operating handle not being removed when adjusting the steering. Figure 2 This is an external schematic diagram of the invention, showing the operating handle being removed after adjusting the steering. Figure 3 This is a schematic diagram of the external appearance of the switch box of the present invention; Figure 4 This is a schematic diagram of the power supply side terminal group and the motor side terminal group inside the switch box of the present invention; Figure 5 This is a schematic diagram of the electrical principle of the switching device of the present invention in the sequential position; Figure 6 This is a schematic diagram of the electrical principle of the switching device of the present invention when it is in the stopped position; Figure 7 This is a schematic diagram of the electrical principle of the switching device of the present invention when it is in the reverse position; Figure 8 This is a schematic diagram of a motor junction box in the background art; Figure 9 This is an enlarged schematic diagram of the interior of the motor junction box and the wiring terminals in the background art; Figure 10This is a schematic diagram of the phase-shifting wiring of an electric motor in the background art; Explanation of reference numerals in the attached figures: 1-Motor body; 2-Power supply side terminal group; 21-First terminal; 22-Second terminal; 23-Unoccupied; 3-Motor side terminal group; 31-Motor wiring terminal; 4-Switch device; 41-First moving contact; 42-Second moving contact; 43-Third moving contact; 5-Switch box; 51-Operating lever; 52-Operating handle; 6-Power supply side terminal; 7-Motor side terminal; 8-Connecting piece; 9-Junction box; 10-Terminal. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Example 1 like Figure 1-7 As shown, the present invention provides an electric motor with a built-in reversing switch, including an electric motor body 1, and further including: a power supply side terminal group 2, including a plurality of first terminals 21 for electrically connecting each phase of the power supply, and at least two first terminals 21 are respectively electrically connected to second terminals 22; an electric motor side terminal group 3, including electric motor terminals 31 for electrically connecting the electric motor body 1; and a switching device 4, which is used to electrically connect the power supply side terminal group 2 and the electric motor side terminal group 3, and is configured to switch between the first terminals 21 and the second terminals 22.

[0030] Specifically, the power supply has three phases: A, B, and C. Since the rotation direction can be reversed simply by swapping any two of the three power lines of the external power supply, this invention selects power phases A and C to be electrically connected to interconnected first terminals 21 and second terminals 22 (power phase B can also be connected to first terminals 21 and second terminals 22). For example, when the first moving contact 41 of the switch device 4 is connected to the first terminal 21 of power phase A and the second moving contact 42 is connected to the first terminal 21 of power phase C, the motor rotates in the forward direction. When the switch device 4 is switched so that the first moving contact 41 is connected to the second terminal 22 of power phase C and the second moving contact 42 is connected to the second terminal 22 of power phase A, the motor is reversed by swapping the A and C wires of the three power lines of the external power supply.

[0031] The switching device 4 has at least two positions, forward and reverse, and is operated by an operating handle 52. For motors with fixed direction requirements, there is no actual forward and reverse. As long as the operating handle 52 reverses between the forward and reverse positions, the operating handle 52 can be moved to another position (forward or reverse) to connect the switching device 4 to the motor terminal 31 and the first terminal 21, or switch to connect the motor terminal 31 and the second terminal 22. The internal structure of the switching device 4 will then achieve phase adjustment, and the direction of rotation can be adjusted.

[0032] Example 2 There is also a gap 23 between the first terminal 21 and the second terminal 22, and the switching device 4 is configured to switch between the first terminal 21, the gap 23 and the second terminal 22.

[0033] Specifically, in this embodiment, the switch device 4 has three positions: forward, stop, and reverse. If the operating handle 52 of the switch device 4 is in the neutral position 23, the motor is disconnected from the power supply and cannot start. The three positions of the switch device 4 are positioned by a spring mechanism. The operating handle 52 will not stay in any position other than these three. The operating handle 52 is in the stop position when it is vertical, in the forward position when it is turned 45 degrees to the left from the stop position, and in the reverse position when it is turned 45 degrees to the right from the stop position. After the operating handle 52 is operated, it will be fixed in the corresponding position and will not return by itself.

[0034] The stopping method of the switching device 4 in this invention is not described in detail, but can be referred to the reversing switch structure in the prior art.

[0035] Example 3 The switching device 4 includes multiple moving contacts, which are electrically connected to the motor terminal 31 of the power supply side terminal group 2. The moving contacts are also electrically connected to the first terminal 21 or the second terminal 22 of the motor side terminal group 3.

[0036] Specifically, the moving contact can switch to be electrically connected to the first terminal 21 or the second terminal 22 by means of rotation or movement. For example, in the rotation mode, one end of it is electrically connected to the motor terminal 31 and rotated, while the other end is connected to the first terminal 21 or the second terminal 22 by swinging or placed in the empty position 23.

[0037] Example 4 The power supply has phase A and phase C. The power supply side terminal group 2 includes a first terminal 21 and a second terminal 22 electrically connected to phase A of the power supply, and also includes a first terminal 21 and a second terminal 22 electrically connected to phase C of the power supply. The first terminal 21 connected to phase A is located between the second terminal 22 connected to phase A and the second terminal 22 connected to phase C of the power supply; the second terminal 22 connected to phase A is located between the first terminal 21 connected to phase C and the first terminal 21 connected to phase A of the power supply. The motor body 1 includes an A-phase winding and a C-phase winding. The motor-side terminal group 3 includes a motor terminal 31 electrically connected to the A-phase winding and a motor terminal 31 electrically connected to the C-phase winding. The switching device 4 includes a first moving contact 41 and a second moving contact 42. One end of the first moving contact 41 is electrically connected to the motor terminal 31 of the A-phase winding, and the other end is electrically connected to the first terminal 21 of the A-phase power supply or the second terminal 22 of the C-phase power supply. One end of the second moving contact 42 is electrically connected to the motor terminal 31 of the C-phase winding, and the other end is electrically connected to the first terminal 21 of the C-phase power supply or the second terminal 22 of the A-phase power supply.

[0038] Specifically, this embodiment uses the example of "swapping the A and C wires of the three power lines of the external power supply". However, it should be understood that the forward and reverse switching function can also be achieved by "swapping the A and B wires of the three power lines of the external power supply, or swapping the B and C wires".

[0039] Such as electrical principles Figure 5-7 As shown, the power supply side terminal group 2 consists of the first terminal 21 of power supply phase C, the second terminal 22 of power supply phase A, the first terminal 21 of power supply phase B, the second terminal 22 of power supply phase B, the first terminal 21 of power supply phase A, and the second terminal 22 of power supply phase C.

[0040] When the operating handle 52 of the switch device 4 is turned to the forward position, the first moving contact 41 connects the first terminal 21 of the motor A-phase winding and the power supply A-phase, and the second moving contact 42 connects the first terminal 21 of the motor C-phase winding and the power supply C-phase, the motor rotates in the forward direction. When the operating handle 52 of the switch device 4 is moved to the stop position, the free end of the first moving contact 41 is moved to the empty position 23 between the first terminal 21 of the power supply A phase and the second terminal 22 of the power supply C phase, and the free end of the second moving contact 42 is moved to the empty position 23 between the first terminal 21 of the power supply C phase and the second terminal 22 of the power supply A phase, that is, the motor is disconnected from the power supply and stops. When the operating handle 52 of the switch device 4 is turned to the reverse position, the first moving contact 41 connects the second terminal 22 of the motor A-phase winding and the power supply C-phase, and the second moving contact 42 connects the second terminal 22 of the motor C-phase winding and the power supply A-phase, the motor reverses.

[0041] Example 5 The power supply also includes a B phase, and the power supply side terminal group 2 includes a first terminal 21 and a second terminal 22 electrically connected to the B phase of the power supply; the motor body 1 also includes a B phase winding, and the motor side terminal group 3 includes a motor terminal 31 electrically connected to the B phase winding; the switching device 4 includes a third moving contact 43, one end of which is electrically connected to the motor terminal 31 of the B phase winding, and the other end is electrically connected to the first terminal 21 or the second terminal 22 of the B phase of the power supply.

[0042] Specifically, in this embodiment, the first terminal 21 and the second terminal 22 are also provided for the B phase of the power supply. However, the first terminal 21 and the second terminal 22 of the B phase of the power supply are both used to connect the B phase winding of the motor. That is, they do not participate in the reversal of the power lines. They are only used to adjust the third moving contact 43 to disconnect or remain connected to the power supply when the switch device 4 is moved as a whole.

[0043] Example 6 It also includes a switch box 5, a power supply side terminal group 2, a motor side terminal group 3, and a switch device 4 integrated within the switch box 5. An operating lever 51 is rotatably connected to the switch box 5, and the operating lever 51 is drive-connected to the switch device 4. One end of the operating lever 51 extends out of the switch box 5 and is detachably connected to an operating handle 52. The end of the operating lever 51 extending out of the switch box 5 has a semi-circular cross-section, and the operating handle 52 has a semi-circular slot into which the semi-circular end of the operating lever 51 is inserted.

[0044] Specifically, before use, select a switch device 4 with a rated current greater than or equal to the rated current of the motor. Remove the motor's junction box and its internal terminals, and install the switch box 5 in the position of the motor's junction box. Connect the three wires inside the motor to the three terminals of the motor-side terminal group 3, and connect the power supply wires to the six terminals of the power supply-side terminal group 2 (each power supply wire has two terminals). The terminals of the power supply-side terminal group 2 and the motor-side terminal group 3 on both sides are not distinguished by power supply and load, but the power supply wires or the internal wires of the motor cannot be connected to the terminals of the power supply-side terminal group 2 and the motor-side terminal group 3 on both sides simultaneously.

[0045] After wiring, if the motor is found to be reversing, simply switch the operating handle 52 to the other side (forward or reverse), and then remove the operating handle 52. This is very convenient and requires no disconnection or rewiring. The reason for removing the operating handle 52 after operation is mainly to prevent accidental activation during motor operation; the handle can be temporarily reattached when needed. Even with the operating handle 52 removed, the semi-circular end of the operating lever 51 makes it easy to identify the current position (the semi-circular flat part corresponds to the actual position of the forward / reverse switch, which is very easy to distinguish). This design ensures that the operating handle 52 can drive the operating lever 51 to rotate, and also prevents the operating handle 52 from being installed incorrectly (it cannot be inserted if incorrectly). Figure 1-3 As shown.

[0046] This invention selects a HY2 type reversing switch with a rated current greater than or equal to the rated current of the motor. The motor's junction box and its terminals are removed, and the HY2 type reversing switch is installed in the location of the motor's junction box. Because the reversing switch terminals are much larger than the original terminals in the motor's junction box, wiring is easier, and the larger internal space reduces the risk of damaging the wires, making it very practical. Furthermore, the reversing switch has a stop position, providing additional safety protection for workers.

[0047] In addition, the power can be turned off before operation of the switch device 4, which can improve the service life of the switch and make it safer.

[0048] Due to the limitation of the rated current of the reversing switch, this invention is only applicable to 380V 10kW and below motors. If the HY2 type reversing switch is specially designed to increase the rated current, it can also be used on motors with a rated current not exceeding the rated current of the reversing switch.

[0049] This invention can also be used for AC 220V motors, as long as the rated current of the motor is not greater than the rated current of the reversing switch, and the operation and usage methods are the same.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor with a built-in reversing switch, comprising a motor body, characterized in that, Also includes: The power supply side terminal group includes a plurality of first terminals for electrically connecting each phase of the power supply, and at least two of the first terminals are respectively electrically connected to second terminals; The motor-side terminal group includes motor terminals for electrically connecting the motor body; A switching device for electrically connecting the power supply side terminal group and the motor side terminal group, and the switching device is configured to switch between the first terminal and the second terminal.

2. The electric motor with a built-in reversing switch according to claim 1, characterized in that, There is also a gap between the first terminal and the second terminal, and the switching device is configured to switch between the first terminal, the gap and the second terminal.

3. The electric motor with a built-in reversing switch according to claim 1 or 2, characterized in that, The switching device includes multiple moving contacts, which are electrically connected to the motor terminals of the power supply side terminal group. The moving contacts are also electrically connected to the first or second terminal of the motor side terminal group.

4. The electric motor with a built-in reversing switch according to claim 3, characterized in that, The power supply has phase A and phase C. The power supply side terminal group includes a first terminal and a second terminal that are electrically connected to phase A of the power supply, and a first terminal and a second terminal that are electrically connected to phase C of the power supply.

5. The electric motor with a built-in reversing switch according to claim 4, characterized in that, The first terminal connecting phase A of the power supply is located between the second terminal connecting phase A of the power supply and the second terminal connecting phase C of the power supply. The second terminal connecting phase A of the power supply is located between the first terminal connecting phase C of the power supply and the first terminal connecting phase A of the power supply.

6. The electric motor with a built-in reversing switch according to claim 5, characterized in that, The motor body includes an A-phase winding and a C-phase winding, and the motor side terminal group includes a motor terminal electrically connected to the A-phase winding and a motor terminal electrically connected to the C-phase winding; The switching device includes a first moving contact and a second moving contact; One end of the first moving contact is electrically connected to the motor terminal of the A-phase winding, and the other end is electrically connected to the first terminal of the A-phase power supply or the second terminal of the C-phase power supply. One end of the second moving contact is electrically connected to the motor terminal of the C-phase winding, and the other end is electrically connected to the first terminal of the C-phase power supply or the second terminal of the A-phase power supply.

7. The electric motor with a built-in reversing switch according to claim 6, characterized in that, The power supply also has a B phase, and the power supply side terminal group includes a first terminal and a second terminal that are electrically connected to the B phase of the power supply. The motor body also includes a B-phase winding, and the motor-side terminal group includes motor terminals that are electrically connected to the B-phase winding. The switching device includes a third moving contact, one end of which is electrically connected to the motor terminal of the B-phase winding, and the other end is electrically connected to the first terminal or the second terminal of the B-phase power supply.

8. The electric motor with a built-in reversing switch according to claim 1, characterized in that, It also includes a switch box, in which the power supply side terminal group, the motor side terminal group and the switching device are integrated.

9. The electric motor with a built-in reversing switch according to claim 8, characterized in that, An operating lever is rotatably connected to the switch box. The operating lever is connected to the switch device in a transmission manner. One end of the operating lever extends out of the switch box and is detachably connected to an operating handle.

10. The electric motor with a built-in reversing switch according to claim 9, characterized in that, The end of the operating lever extending out of the switch box has a semi-circular cross-section, and the operating handle is provided with a semi-circular slot. The semi-circular end of the operating lever is inserted into the semi-circular slot of the operating handle.

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