CN217036873U

CN217036873U - Three-tap motor

Info

Publication number: CN217036873U
Application number: CN202220052999.4U
Authority: CN
Inventors: 马晓鹏; 张磊; 王辉; 杨瑞敏
Original assignee: Xi'an Tsingtech New Energy Technology Co ltd
Current assignee: Xi'an Tsingtech New Energy Technology Co ltd
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-07-22
Anticipated expiration: 2032-01-10

Abstract

The utility model relates to the technical field of motor design and manufacture, in particular to a three-tap motor which comprises a stator, wherein a stator slot is arranged on the stator, and a stator winding is matched in the stator slot; the utility model has the following advantages: the widely adopted scattered winding technology has the advantages of convenience, flexibility and low cost, but when the technology is used for a winding three-tap scheme, the operation is very difficult due to the fact that the number of connection points between coil groups is very large. The three-tap scheme of the winding adopts the flat wire wave winding technology, so that the operation is very convenient, and the three-tap scheme of the winding can be very conveniently implemented due to the advantages of very few connecting wires among the special coil groups of the wave winding and convenience in equal division of the winding and the convenience in insulating operation in the flat wire slot.

Description

Three-tap motor

Technical Field

The utility model relates to the technical field of motor design and manufacture, in particular to a three-tap motor.

Background

For the permanent magnet synchronous motor to simultaneously meet the output requirements of low-speed large torque and high-speed high power, a variable winding technology can be adopted, namely the motor adopts full winding work when outputting large torque at low speed, the motor is gradually switched to 3/4 windings, 2/4 windings and 1/4 windings to work along with the increase of the rotating speed, and the motor can output high power in a 1/4 winding work mode at the highest rotating speed. The winding is switched for many times, so that the range of the output torque and the power of the motor in a full-rotating-speed interval can be wider, and the change of the current is smaller due to the smaller change of the winding before and after switching, so that the switching transition is more stable.

According to the motor principle, the electromagnetic torque vector T of the motor_emEqual to the cross product of the flux linkage vector Ψ and the current vector I, i.e., T_emΨ × I. The flux linkage psi is equal to the product of the number of winding turns N and the magnetic flux phi in value, that is, psi is equal to N phi, so that for a low-speed high-torque working condition, the flux linkage psi can be increased by increasing the number of winding turns N, and while the electromagnetic torque can be increased, the current can be kept at a relatively small value, so that the capacity of the controller is relatively small, and the cost is saved.

For the high-speed high-power working condition, the number of turns of the motor winding is required to be less so that the inductance of the motor winding is smaller, the output of enough large peak power can be ensured, and the burden of the controller for outputting large weak magnetic current can be lightened, so that the output current of the controller can be reduced, and the capacity of the controller is relatively smaller.

The requirements of the two working conditions on the number of turns of the motor winding are opposite, so that the problem is solved by using a variable winding technology, the motor works by using a full winding when the motor is in low speed and high torque, and the motor is switched to a partial winding to work when the motor is in high speed and high power, so that the requirement of outputting larger peak torque to the motor is met, the motor can be ensured to output enough peak power even at the highest speed, and the advantage of smaller controller capacity can be obtained.

The switching from the full winding to the 3/4, 2/4 and 1/4 windings is realized by arranging three middle taps on the windings, and a plurality of connection points are generated by adopting a common scattered winding scheme, so that the implementation is very difficult.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provides a three-tap motor.

In order to achieve the purpose, the technical scheme provided by the utility model is as follows:

a three-tap motor comprises a stator, wherein a stator slot is formed in the stator, and a stator winding is matched in the stator slot.

Further, three intermediate taps equally divide each phase winding into four parts with equal turns.

Furthermore, all the single-turn coils under the positive phase zone of each phase winding are connected in series according to the wave winding rule to form a positive phase zone coil group, and all the single-turn coils under the negative phase zone of each phase winding are connected in series according to the wave winding rule to form a negative phase zone coil group.

Furthermore, the coil groups of the positive and negative phase belts of each phase of winding are connected in series by tail ends, so that the coil groups are formed, the coil groups are formed by 3 times of operation, the coil groups are respectively formed, the coil groups are stacked on the coil group, the tail ends of the 4 coils are connected, and the coil groups can be connected in series to form the U-phase winding.

Furthermore, the coil groups are completely the same, namely, the coils are divided into four equal parts.

Furthermore, after the three-phase winding is completely finished, the flat wires in the stator slots finally form 8 layers.

Furthermore, the adopted flat wire is an enameled flat copper wire. The section of the flat wire is rectangular, and the insulation between the coils of different layers in the slot is easy to implement.

Compared with the prior art, the utility model has the following advantages: the advantages of the widely adopted random-insertion winding technology are convenience, flexibility and low cost, but when the technology is used for a winding three-tap scheme, the operation is very difficult due to the fact that the number of connection points among coil groups is very large. The three-tap scheme of the winding adopts the flat wire wave winding technology, so that the operation is very convenient, and the three-tap scheme of the winding can be very conveniently implemented due to the advantages of very few connecting wires among coil groups specific to the wave winding and convenience in equal division of the winding and the convenience in insulating operation in the flat wire slot.

Drawings

For a more clear understanding of the present invention, the present disclosure is further described by reference to the drawings and illustrative embodiments, which are provided for illustration and are not to be construed as limiting the disclosure.

FIG. 1 is an expanded view of an 8-pole 48-slot wave winding;

FIG. 2 is a schematic diagram of an 8-pole 48-slot 3-tap winding connection;

figure 3 is a schematic illustration of the layering of the flat wire within the slot.

Detailed Description

The preferred embodiments of the present invention are described below, and it should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention and are not to be construed as limiting the present invention.

Example 1

A three-tap motor characterized by: and each phase winding is provided with three middle taps, and each phase winding is divided into four parts, so that 1/4, 2/4, 3/4 and 4/4 winding operation modes are realized.

The adopted flat wire is an enameled copper flat wire.

As shown in fig. 1, taking an 8-pole 48-slot motor as an example, fig. 1 is an expanded view of an 8-pole 48-slot U-phase wave winding, where all single-turn coils under a positive phase belt are connected in series according to a wave winding rule to form a coil group, and the coil group has only 2 end points at the head and the tail; and all the single-turn coils under the negative phase zone are connected in series according to the wave winding rule to form a coil group, and the coil group also only has 2 end points at the head and the tail. Then the positive and negative phase coil groups are connected in series by connecting the tail ends of the coil groups, thus forming the coil group (I) which only needs to be connected once. And (3) operating to form coil groups II, III and IV, overlapping the coil groups I layer by layer, connecting the tail ends of 4 coils, and connecting the tail ends of the 4 coils in series to form a U-phase winding, wherein the coil groups are connected 7 times in total and less, and the figure 2 shows that the coil groups are formed. The coil groups are completely the same, namely, the coil is divided into four equal parts. The section of the flat wire is rectangular, and the insulation between the coils of different layers in the slot is easy to implement.

As shown in fig. 1, the tail U1' of the positive phase band coil group is connected to the head X1 of the negative phase band coil group, so that the coil group (r): head U1, tail X1'. The coil group I is completely overlapped and superposed with 3 layers of coil groups II, III and IV, the tail ends of 4 coil groups are connected and are connected in series to form a U-phase winding: the head U1 and the tail X4 'are shown in figure 2, so that the middle three-tap U2, U3 and U4 equally divide the whole winding into four parts, and U1-U2, U1-U3, U1-U4 and U1-X4' respectively form 1/4, 2/4, 3/4 and 4/4 windings. As shown in fig. 3, after the three-phase winding is completed, the flat wires in the stator slots are finally formed into 8 layers.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A three-tap motor comprises a stator, wherein a stator slot is formed in the stator, and a stator winding is matched in the stator slot.

2. A three-tap motor according to claim 1, characterized in that: the three middle taps equally divide each phase winding into four parts with equal turns.

3. A three-tap motor as claimed in claim 1 or 2, characterized in that: all the single-turn coils under the positive phase zone of each phase winding are connected in series according to the wave winding rule to form a positive phase zone coil group, and all the single-turn coils under the negative phase zone of each phase winding are connected in series according to the wave winding rule to form a negative phase zone coil group.