Ice region pod propulsion motor winding structure

Abstract

The application discloses an ice region nacelle propelling motor winding structure, which comprises a stator core, a torque control coil and a magnetic field modulation coil, four layers of independent coils are arranged in each stator slot, the original double-layer winding is decoupled into torque control and magnetic field modulation, the winding process and the offline process can be simplified after decoupling, the end length of the coil can be effectively shortened, the overall size of the motor can be effectively reduced, the stator has two sets of independent coil control modes in the control aspect, the motor has stronger overload capacity and speed expansion capacity, the double-winding design in the same slot simplifies the process of the double-winding design, the motor scheme has certain redundancy, when one set of winding fails, the other set of winding can still operate for a short time, under the extreme condition that the permanent magnet loses magnetism, the two sets of independent windings can still keep the motor to operate for a short time under overload.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ice region pod propeller, and particularly relates to a winding structure of an ice region pod propeller motor. BACKGROUND

[0002] As a common ice-breaking propelling device for ships, the ice region pod propeller has a large overload capacity and a wide speed regulation range, and needs to meet the low-speed ice-breaking and high-speed open water running of the motor at the same time.

[0003] The rotor of the ice region pod motor generates a constant magnetic field by a permanent magnet, and the stator winding is connected to a three-phase alternating current to generate an alternating rotating magnetic field. At this time, the rotating magnetic field of the stator and the constant magnetic field of the rotor are interlinked with each other, and the electromagnetic energy conversion of the two makes the rotor part of the motor rotate, which is the basic principle of motor rotation.

[0004] The disadvantage of the traditional scheme is that the ice region pod motor cannot cope with complex working conditions. The pod motor needs to realize the ice-breaking function when running at low speed, so it has a large overload capacity. At the same time, high-speed navigation needs to be realized under the open water condition. Since the ice region pod motor adopts a surface-mounted permanent magnet synchronous motor structure, the direct and quadrature axis inductances of the stator are the same, the reluctance torque does not work, the quadrature axis current generates the torque of the motor, and the motor outputs the maximum power when id=0 control. The ice region pod needs to increase the main magnetic field to realize greater overload capacity. At the same time, the terminal voltage of the motor is proportional to the speed. In order to meet the terminal voltage of the motor under the open water condition, which does not exceed the limit value of the frequency converter, the direct-axis demagnetizing current of the winding needs to be increased to reduce the winding voltage when the motor runs at high speed, so as to realize the function of field weakening and speed expansion. However, the increase of the direct-axis current of the motor will cause the current of the stator winding to increase rapidly, which will soon exceed the capacity of the frequency converter, so that the frequency converter needs to be designed to be larger. At the same time, when designing the motor, more margin needs to be considered for these complex working conditions, so that the volume of the motor is large. SUMMARY

[0005] In order to solve the above problems in the prior art, the application provides an ice region pod propeller motor winding structure, which can reduce the winding difficulty of the motor, shorten the axial length of the motor, reduce the overall size of the motor, decouple the control algorithm of the stator magnetic field, realize that the ice region pod propeller has a high overload capacity at low speed ice-breaking, has a wider speed regulation range when running in open water, and ensures that the motor has a certain fault tolerance.

[0006] In order to achieve the above object, the technical scheme adopted by the present application to solve its technical problems is: an ice region nacelle propelling motor winding structure, comprising a stator core and a stator winding, M stator slots are uniformly arranged on the stator core, the stator winding comprises four groups of independent coils of a first layer coil, a second layer coil, a third layer coil and a fourth layer coil arranged in the stator slots, the first layer coil and the second layer coil in the first stator slot are connected with the third layer coil and the fourth layer coil in the N+1 st stator slot respectively, the first layer coil and the third layer coil are connected to form a torque control coil, the second layer coil and the fourth layer coil are connected to form a magnetic field modulation coil, the end wire noses of the torque control coil and the magnetic field modulation coil are misalignedly installed, 1≤N<M, the distance between adjacent torque control coils and magnetic field modulation coils is 15-50mm, and the distance between adjacent end wire noses is 15-50mm.

[0007] Further, the first layer coil, the second layer coil, the third layer coil and the fourth layer coil are sequentially arranged in each stator slot along the slot opening to the slot.

[0008] Further, the first layer coil and the second layer coil are arranged side by side, the third layer coil and the fourth layer coil are arranged side by side, the first layer coil and the third layer coil are sequentially arranged in each stator slot along the slot opening to the slot, and the second layer coil and the fourth layer coil are sequentially arranged in each stator slot along the slot opening to the slot.

[0009] Further, the stator winding comprises two sets of independent three-phase control modes, the number of turns of the first layer coil and the third layer coil is more than that of the second layer coil and the fourth layer coil.

[0010] Further, the distance between adjacent end wire noses is 15-50mm.

[0011] The present application has the following beneficial effects:

[0012] The coils in the stator slots are physically decoupled, there are four layers of coils in each slot, the first layer coil in one stator slot and the third layer coil in another stator slot are connected to form a torque control coil, similarly, the second layer coil in one stator slot and the fourth layer coil in another stator slot are connected to form a magnetic field modulation coil, and so on, after decoupling, the winding process and the offline process can be simplified, the length of the end part of the coil can be effectively shortened, and the overall size of the motor can be effectively reduced when the motor is designed, without leaving more margin for ice breaking and speed expansion of the main magnetic field.

[0013] The stator has two independent control modes, when the motor is in the ice breaking working condition, the torque control coil controls the rotating speed, the magnetic field modulation coil generates a magnetic field for magnetizing, the air gap magnetic field of the motor is increased, the motor has greater overload function, when the motor is in the open water running, the magnetic field modulation coil of the motor is in the demagnetization working condition, the terminal voltage of the motor can be reduced, and a wider speed regulating range is realized.

[0014] The application realizes double-winding control in the same slot, greatly simplifies the processing technology of double-winding control, and the main magnetic field magnetic circuit of the motor is consistent with the previous one, so that the risk of redesigning the double-winding motor can be avoided, the design scheme makes the coil have certain redundancy when running, and when one set of winding fails, the other set of winding can still run for a short time, and when the motor is subjected to strong impact under extreme conditions and the permanent magnet is demagnetized, the two sets of independent windings can still keep the motor short-time overload running. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a structural schematic diagram of Example 1 of the application;

[0016] Figure 2 Fig. 1 is a structural schematic diagram of Example 1 of the application;

[0017] Figure 3 Fig. 2 is a structural schematic diagram of Example 2 of the application.

[0018] The reference signs are as follows: 1 - stator slot, 2 - torque control coil, 3 - magnetic field modulation coil, 4 - first layer coil, 5 - second layer coil, 6 - third layer coil, 7 - fourth layer coil. DETAILED DESCRIPTION

[0019] The embodiments of the application will be described in detail below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the application, and are not intended to limit the protection scope of the application. For example, although the components in the drawings are drawn in a specific proportion, these proportion relationships are only exemplary, and those skilled in the art can adjust them as needed to adapt to specific application occasions. Example 1

[0020] According to an example of the application, as Figure 1The ice region pod propulsion motor winding structure disclosed by the application is composed of the stator slot 1, the torque control coil 2 and the magnetic field modulation coil 3 which are uniformly arranged on the stator core, wherein the torque control coil 2 comprises the first layer coil 4 and the third layer coil 6, the magnetic field modulation coil comprises the second layer coil 5 and the fourth layer coil 7, the torque control coil controls the rotating speed when the motor runs at low speed in the ice breaking condition, the magnetic field generated by the magnetic field modulation coil is used for magnetizing, the air gap magnetic field of the motor is increased, the overload function of the motor can be realized, the magnetic field modulation coil of the motor runs in the demagnetization condition when the motor runs in the open water, the working voltage of the motor can be reduced, and a wider speed regulating range can be realized.

[0021] The torque control coil normally runs when the motor runs at low speed in the ice breaking condition, and the magnetic field modulation coil works in the magnetizing condition at this time.

[0022] The stator winding comprises two sets of independent three-phase control modes, the first layer coil 4 and the third layer coil 6 belong to the torque control of the motor, the number of turns of the coils is large, and the second layer coil 5 and the fourth layer coil 7 belong to the magnetic field modulation of the motor, the number of turns of the coils is small.

[0023] The stator winding of the embodiment is composed of four groups of independent coils, i.e., the first layer coil 4, the second layer coil 5, the third layer coil 6 and the fourth layer coil 7 which are arranged in the slot from the slot opening to the slot in sequence, in M stator slots 1, the first layer coil 4 and the second layer coil 5 in a certain stator slot 1 are connected with the third layer coil 6 and the fourth layer coil 7 in the N+1 st stator slot 1 separated by a partition, the first layer coil 4 and the third layer coil 6 in different stator slots 1 are connected to form the torque control coil 2, the second layer coil 5 and the fourth layer coil 7 are connected to form the magnetic field modulation coil 3, the end noses of the torque control coil 2 and the magnetic field modulation coil 3 are installed in a staggered manner, and from the radial view, i.e., the top view, they are parallelly installed, but there is a distance of 15-50 mm between them. Embodiment 2

[0024] Different from the above embodiment, when viewed from the inside of the stator to the slot, the first layer coil 4 and the second layer coil 5 are in a parallel state, the third layer coil 6 and the fourth layer coil 7 are in a parallel state, the first layer coil 4 and the third layer coil 6 are arranged in each stator slot 1 from the slot opening to the slot in sequence, and the second layer coil 5 and the fourth layer coil 7 are arranged in each stator slot 1 from the slot opening to the slot in sequence. The torque control coil 2 and the magnetic field modulation coil 3 in different stator slots 1 are parallelly installed from the axial view, i.e., the front view.

[0025] The above embodiments only illustrate the principles and effects of the present application and some applied embodiments, and for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. An ice region pod propulsion motor winding structure, comprising a stator core and a stator winding, wherein M stator slots (1) are evenly arranged on the stator core, and characterized in that: The stator winding comprises a first layer coil (4), a second layer coil (5), a third layer coil (6) and a fourth layer coil (7) independently arranged in a stator slot (1); the first layer coil (4) and the second layer coil (5) in the first stator slot (1) are respectively connected to the third layer coil (6) and the fourth layer coil (7) in the N+1 stator slot (1); the first layer coil (4) and the third layer coil (6) are connected to form a torque control coil (2); the second layer coil (5) and the fourth layer coil (7) are connected to form a magnetic field modulation coil (3); the end wire noses of the torque control coil (2) and the magnetic field modulation coil (3) are staggered, 1≤N<M, and the spacing between adjacent torque control coils (2) and magnetic field modulation coils (3) is 15 to 50 mm.

2. The winding structure of an ice region pod propulsion motor according to claim 1, characterized in that: The first layer coil (4), the second layer coil (5), the third layer coil (6) and the fourth layer coil (7) are arranged in sequence along the notch.

3. The winding structure of an ice region pod propulsion motor according to claim 1, characterized in that: The first layer coil (4) and the second layer coil (5) are arranged side by side, the third layer coil (6) and the fourth layer coil (7) are arranged side by side, and the first layer coil (4) / second layer coil (5) and the third layer coil (6) / fourth layer coil (7) are arranged in sequence along the notch.

4. The ice region pod propulsion motor winding structure according to claim 1, 2 or 3, characterized in that: The number of turns of the first layer coil (4) and the third layer coil (6) is greater than that of the second layer coil (5) and the fourth layer coil (7).

5. The winding structure of an ice region pod propulsion motor according to claim 4, characterized in that: The distance between adjacent end line noses is 15 to 50 mm.

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