Series excited motor suitable for high-voltage and low-voltage dual-voltage work

Abstract

The utility model discloses a series excited motor suitable for high and low voltage dual-voltage work, which comprises a stator and a rotor, the stator is provided with two or more groups of windings, and each group of windings corresponds to one group of outgoing lines and carbon brushes; the rotor is provided with two or more groups of commutators, and each group of commutators corresponds to one group of carbon brushes of the stator; the number of winding turns between the stator and the rotor is close, and the angle of the commutator is consistent. The motor can be conveniently switched between a low voltage such as 70V direct current and a high voltage such as 220V alternating current, and can maintain high working efficiency and good rotating speed control performance under the two voltages.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a series-excited motor suitable for high-voltage and low-voltage dual-voltage operation. Background Art

[0002] In the existing field of electric machinery technology, series motors are widely used due to their compact structure, large starting torque, good speed regulation performance, etc., especially in mobile devices such as battery vehicles, which are usually powered by a DC power supply of about 70V. However, the existing series motor design is mainly optimized for a specific voltage range, especially when facing a high-voltage power supply such as 220V AC, it is often not directly and effectively utilized, or can only be barely operated in a reduced efficiency manner, which greatly limits the versatility and flexibility of such motors.

[0003] The published patent CN219227332U proposes a dual-voltage driven motor solution. Although this solution also uses multiple sets of carbon brush structures to adapt to different voltage conditions, the core difference is that the stator in this patent uses a permanent magnet structure instead of a series-excited winding design. Although this motor improves voltage adaptability to a certain extent, it still has problems such as efficiency loss and increased control complexity when dealing with the conversion between high and low voltages. In particular, it fails to solve the problems of excessive speed, difficulty in precise control, and low efficiency that may occur in traditional 70V series-excited motors under 220V high voltage conditions. Summary of the invention

[0004] The technical solution adopted by the present application to solve its technical problems is: a series-excited motor suitable for high-low voltage dual voltage operation, including a stator and a rotor, the stator has two or more groups of windings, each group of windings corresponds to a group of lead wires and carbon brushes; the rotor has two or more groups of commutators, each group of commutators corresponds to a group of carbon brushes of the stator; the number of winding turns between the stator and the rotor is close, and the angles of the commutators are consistent.

[0005] In some embodiments, the windings are connected to a circuit board via lead wires, and the stator windings are selectively connected in series or in parallel via switches.

[0006] In some embodiments, each set of commutators is located at the same end of the rotor.

[0007] In some embodiments, each set of commutators is distributed at both ends of the rotor.

[0008] In some embodiments, the wires on each group of commutators are wound on the non-salient pole core with a number of turns close to that of the corresponding stator windings, and can be connected to corresponding carbon brushes respectively.

[0009] In some embodiments, the winding directions of the windings corresponding to each group of commutators are consistent.

[0010] The beneficial effect of the present application is to provide a series-excited motor that can be easily switched between low voltage, such as 70V DC, and high voltage, such as 220V AC, and can maintain high working efficiency and good speed control performance under both voltages. By improving the structure and arrangement of the stator winding and the design of the rotor commutator, the motor can achieve efficient dual-voltage operation without the intervention of an additional complex controller, greatly expanding the applicable scenarios of the series-excited motor in a variety of voltage environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 It is a structural diagram of the stator assembly of this application.

[0013] Figure 2 It is the connection principle diagram of this application.

[0014] Figure 3 This is one of the schematic diagrams of this application.

[0015] Figure 4 This is one of the schematic diagrams of this application.

[0016] Figure 5 This is the first embodiment of the rotor assembly of the present application.

[0017] Figure 6 This is the second embodiment of the rotor assembly of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection of this application.

[0019] Please refer to Figure 1-6 As shown, a specific implementation of the present application is: a series-excited motor suitable for high-voltage and low-voltage dual-voltage operation, mainly including a stator assembly and a rotor assembly.

[0020] The specific structure of the stator assembly is as follows:

[0021] The stator includes two independent windings, namely the first winding 11 and the second winding 12. Each winding is wound evenly on the iron core according to predetermined equal parts, and the winding direction of each winding is consistent and the number of turns is close. The first winding 11 leads out wires as A+ and A- at the head and tail ends respectively, and the second winding 12 also leads out wires as B+ and B-. The two windings are connected to the external circuit through their respective carbon brushes (111, 121).

[0022] The specific structure of the rotor assembly is as follows:

[0023] There are two identical commutators inside the rotor, namely commutator A and commutator B, with the same structure and angle. Commutators A and B are each connected to a set of windings that match the stator windings. These two sets of windings are wound on the hidden pole core in the same direction and with a similar number of turns as the stator windings.

[0024] like Figure 5-6 As shown, the commutators A and B on the rotor can be arranged on the same end face or two end faces to facilitate current switching in conjunction with carbon brushes.

[0025] About system connection method: Figure 2-4 As shown, the lead wires A+, A-, B+, B- of the stator winding are connected to the circuit board, and a switch that can switch between series and parallel modes is integrated in the circuit board. In practical applications, by switching the switch, the two sets of stator windings can be connected in series or in parallel, so as to achieve flexible switching between 70V low-voltage DC power supply and 220V high-voltage AC power supply, so that the motor can maintain efficient and stable operation in both voltage environments, and also avoid the problem of speed loss control caused by voltage mutation.

[0026] In addition, this application also particularly emphasizes that the stability during high and low voltage switching is fully considered during the design. By accurately calculating and designing the winding parameters, it is ensured that the motor has good dynamic response and torque output characteristics under different voltages, which significantly improves the practicality and safety of the motor.

[0027] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present application, and the aforementioned embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A series-excited motor suitable for high-low voltage dual-voltage operation, comprising a stator and a rotor, characterized in that: The stator has two or more windings, each winding corresponds to a set of lead wires and carbon brushes; the rotor has two or more commutators, each commutator corresponds to a set of carbon brushes of the stator; the number of winding turns between the stator and the rotor is close, and the angles of the commutators are consistent.

2. A series-excited motor suitable for high-low voltage dual-voltage operation according to claim 1, characterized in that: The windings are connected to the circuit board through lead wires, and the stator windings are selectively connected in series or in parallel through switches.

3. A series-excited motor suitable for high-low voltage dual voltage operation according to claim 1 or 2, characterized in that: Each set of commutators is located at the same end of the rotor.

4. A series-excited motor suitable for high-low voltage dual voltage operation according to claim 1 or 2, characterized in that: Each set of commutators is distributed at both ends of the rotor.

5. The series-excited motor suitable for high-low voltage dual-voltage operation according to claim 1, characterized in that: The wires on each group of commutators are wound on the hidden pole core with a number of turns close to that of the corresponding stator windings, and can be connected to the corresponding carbon brushes respectively.

6. The series-excited motor suitable for high-low voltage dual-voltage operation according to claim 1, characterized in that: The winding directions of the corresponding windings on each set of commutators are consistent.

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