Ice pod propulsion motor winding structure

Abstract

The invention discloses an ice pod propulsion motor winding structure, which comprises a stator iron 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 coil inserting process can be simplified after decoupling, and the winding efficiency is improved. The length of the end portion 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 higher overload capacity and speed expansion capacity, the double-winding design in the same groove simplifies the process of the double-winding design, and the scheme of the motor has certain redundancy. When one set of winding breaks down, the other set of winding can still operate in a short time, and after the permanent magnets are demagnetized under an extreme condition, the two sets of independent windings can still keep the motor to operate in a short-time overload mode.

Description

Technical Field

[0001] The invention belongs to the technical field of ice region pod propulsion, and in particular relates to a winding structure of an ice region pod propulsion motor. Background Art

[0002] As a common marine icebreaking propulsion device, ice zone pod thrusters have a large overload capacity and a wide speed regulation range, and need to meet the motor's low-speed icebreaking and high-speed open water operation requirements at the same time.

[0003] The rotor of the ice zone pod motor generates a constant magnetic field by permanent magnets, and three-phase alternating current is passed into the stator winding 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 interconnected, and the electromagnetic energy conversion between the two causes the rotor part of the motor to rotate. This is the basic principle of motor rotation.

[0004] The disadvantage of the traditional solution is that the pod motor in the ice area 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, it needs to realize high-speed navigation under open water conditions. Since the pod motor in the ice area adopts a surface-mounted permanent magnet synchronous motor structure, the stator's direct-axis inductance and direct-axis inductance are the same, the magnetic resistance torque does not do work, and the direct-axis current generates the torque of the motor. The motor has the maximum output power when id=0 control. When the pod in the ice area breaks ice, it is necessary to increase the main magnetic field to achieve a greater overload capacity. At the same time, the terminal voltage of the motor is proportional to the speed. In order to ensure that the terminal voltage of the motor in open water conditions does not exceed the limit value of the inverter, the motor needs to increase the direct-axis demagnetization current of the winding to reduce the winding voltage when running at high speed, thereby realizing the function of weak magnetic speed expansion. However, the increased direct-axis current of the motor will cause the current of the motor stator winding to increase rapidly, which will soon exceed the capacity of the inverter, making the inverter larger in design. At the same time, when designing the motor, considering these complex working conditions, it is also necessary to leave a larger margin, making the motor larger in size. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present invention proposes a winding structure of an ice zone pod propulsion motor, which can reduce the difficulty of motor winding offline, shorten the axial length of the motor, shorten the overall size of the motor, and physically decouple the control algorithm of the stator magnetic field, so as to achieve a higher overload capacity for the ice zone pod propulsion device during low-speed icebreaking and a wider speed regulation range during open water operation, while ensuring that the motor has a certain fault tolerance rate.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: an ice area pod propulsion motor winding structure, including a stator core and a stator winding, M stator slots are evenly arranged on the stator core, and the stator winding includes four groups of independent coils, namely a first layer coil, a second layer coil, a third layer coil and a fourth layer coil, which are arranged in the stator slots. The first layer coil and the second layer coil in the first stator slot are respectively connected to the third layer coil and the fourth layer coil in the N+1th stator slot, 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, and the end wire noses of the torque control coil and the magnetic field modulation coil are staggered. 1≤N<M, the spacing between adjacent torque control coils and magnetic field modulation lines is 15-50mm, and the spacing between adjacent end wire noses is 15-50mm.

[0007] Furthermore, 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.

[0008] Furthermore, 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 arranged in sequence along the slot opening into the slot in each stator slot, and the second layer coil and the fourth layer coil are arranged in sequence along the slot opening into the slot in each stator slot.

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

[0010] Furthermore, the distance between adjacent end line noses is 15 to 50 mm.

[0011] The beneficial effects of the present invention are: The coils in the stator slots of the present invention are physically decoupled, and each slot has 4 layers of coils. The first layer of coils in one stator slot and the third layer of coils in another stator slot are connected to form a torque control coil. Similarly, the second layer of coils in one stator slot and the fourth layer of coils 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, and the end length of the coil can be effectively shortened. At the same time, when designing the motor, the main magnetic field does not need to leave more margin for ice breaking and speed expansion, which can effectively reduce the overall size of the motor.

[0012] The stator of the present invention has two independent control modes. When the motor is operating in ice-breaking conditions, the torque control coil controls the speed, and the magnetic field generated by the magnetic field modulation coil is used to increase magnetization, thereby increasing the air gap magnetic field of the motor. The motor has a greater overload function. When operating in open water, the magnetic field modulation coil of the motor operates in a demagnetization condition, which can reduce the terminal voltage of the motor and achieve a wider speed regulation range.

[0013] The present invention realizes dual-winding control in the same slot, greatly simplifies the processing technology of dual-winding control, and at the same time, the main magnetic field magnetic circuit of the motor is consistent with that before, which can avoid the risk of redesigning the dual-winding motor. Such a design scheme allows the coil to have a certain redundancy during operation. At the same time, when one set of windings fails, the other set of windings can still operate for a short time. Under extreme conditions, when the motor is subjected to a strong impact and causes the permanent magnet to lose magnetism, the two existing independent windings can still keep the motor in short-term overload operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of Example 1 of the present invention; Figure 2 A top view of the coil of Example 1 of the present invention; Figure 3 This is a schematic diagram of the structure of Example 2 of the present invention.

[0015] The reference numerals of the figures are: 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

[0016] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the various components in the accompanying drawings are drawn in specific proportions, these proportional relationships are only exemplary, and those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios. Example 1

[0017] According to an example of the present invention, Figure 1 As shown, the present invention discloses an ice area pod propulsion motor winding structure, which is composed of stator slots 1, torque control coils 2 and magnetic field modulation coils 3 evenly arranged on the stator core, wherein the torque control coils 2 include a first layer coil 4 and a third layer coil 6, and the magnetic field modulation coils include a second layer coil 5 and a fourth layer coil 7. When the motor runs at a low speed in an icebreaking condition, the torque control coil controls the speed, and the magnetic field generated by the magnetic field modulation coil is used for magnetization, which increases the air gap magnetic field of the motor and can achieve a greater overload function of the motor. When running in open water, the magnetic field modulation coil of the motor runs in a demagnetization condition, which can reduce the working voltage of the motor and achieve a wider speed regulation range.

[0018] The torque control coil operates normally during low-speed ice breaking, and the magnetic field modulation coil operates in a magnetizing condition. When the motor is running at high speed, the magnetic field modulation coil operates in a demagnetizing condition.

[0019] The stator winding includes 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 and have more coil turns. The second layer coil 5 and the fourth layer coil 7 belong to the magnetic field modulation of the motor and have fewer coil turns.

[0020] The stator winding of the present embodiment is composed of four groups of independent coils, namely, a first layer coil 4, a second layer coil 5, a third layer coil 6 and a fourth layer coil 7, which are arranged in sequence from the slot opening to the slot inside each stator slot 1. Among the M stator slots 1, the first layer coil 4 and the second layer coil 5 in a certain stator slot 1 are respectively connected to the third layer coil 6 and the fourth layer coil 7 in the adjacent N+1 stator slot 1, the first layer coil 4 and the third layer coil 6 in different stator slots 1 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, and the end wire noses of the torque control coil 2 and the magnetic field modulation coil 3 are installed in an offset manner. From the top view, that is, the radial view, they are installed in parallel, but there is a distance of 15 to 50 mm between the two. Example 2

[0021] The difference from the above embodiment is that when looking from the inner circle of the stator into the slot, the first layer coil 4 and the second layer coil 5 of the stator are in parallel, the third layer coil 6 and the fourth layer coil 7 are in parallel, the first layer coil 4 and the third layer coil 6 are arranged in sequence along the slot opening into the slot in each stator slot 1, and the second layer coil 5 and the fourth layer coil 7 are arranged in sequence along the slot opening into the slot in each stator slot 1. The torque control coil 2 and the magnetic field modulation coil 3 in different stator slots 1 are installed in parallel from the front view, i.e., the axial direction.

[0022] The above embodiments are only illustrative of the principles and effects of the present invention, as well as some embodiments of its application. For those skilled in the art, several modifications and improvements may be made without departing from the creative concept of the present invention, and all of these belong to the protection scope of the present invention.

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+1th 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 15-50 mm.

2. The ice region pod propulsion motor winding structure according to claim 1 is 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 ice region pod propulsion motor winding structure according to claim 1 is 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 ice region pod propulsion motor winding structure according to claim 4 is characterized in that: The distance between adjacent end line noses is 15 to 50 mm.

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