CN101882850A - High Power Density Permanent Magnet Synchronous Motor - Google Patents

Abstract

A permanent magnet synchronous motor with high power density belongs to the technical field of motors. It solves the problem that the existing multi-phase permanent magnet synchronous motor is cooled by a liquid cooling method, and pipelines need to be arranged inside the motor, resulting in a large volume of the motor or reducing the efficiency of the motor. It includes a stator and a rotor. There is an air gap between the stator and the rotor. The stator includes an armature core and an armature winding. The surface forms a spaced arrangement of parallel teeth and trapezoidal teeth, the air gap side of the trapezoidal teeth is the short side, and an axial circular through hole is set in the middle of the tooth root of each trapezoidal tooth; the armature winding is set on the parallel teeth, and the armature The winding is composed of single-layer coils connected in series or in parallel, and the coils are square. The invention is suitable for permanent magnet synchronous motors.

Description

High Power Density Permanent Magnet Synchronous Motor

technical field

The invention relates to a high power density permanent magnet synchronous motor, which belongs to the technical field of motors.

Background technique

At present, multi-phase permanent magnet synchronous motors mostly use fractional slot concentrated windings. The manufacturing process of the motor is simple, the end of the winding is short, the insulation is easy, the efficiency of the motor is high, and the cost is low; at the same time, by choosing a reasonable number of poles and slots, Can effectively reduce the positioning torque of the motor.

In order to enhance the cooling capacity of the motor, improve the power density and reliability of the motor, liquid cooling methods such as water cooling or oil cooling are often used to cool the motor. For the cooling of the external casing pipeline shown in Figure 6 and the internal winding pipeline cooling shown in Figure 6, the cooling of the external casing pipeline needs to be machined or milled out of the spiral waterway on the casing, so the volume of the motor is large and the structure is complicated. Moreover, the thermal resistance between the core and the casing is large, and the cooling effect of the motor is poor; for the internal winding pipeline cooling method, the winding can be directly cooled, and the cooling effect is good, but because the cooling pipeline occupies the space where the winding is located, the winding The resistance of the motor is large and the loss is large, which reduces the efficiency of the motor.

Contents of the invention

The purpose of the present invention is to solve the problem that the current multi-phase permanent magnet synchronous motor is cooled by liquid cooling, and it is necessary to arrange pipelines inside the motor, resulting in a large motor volume or reducing the efficiency of the motor, and to provide a permanent magnet motor with high power density. synchronous motor.

The present invention includes a stator and a rotor, an air gap is formed between the stator and the rotor,

Stator includes armature core and armature winding,

The side surface of the air gap of the armature core is a tooth alveolar structure, and a plurality of parallel slots form the spaced arrangement of parallel teeth and trapezoidal teeth on the side surface of the air gap of the armature core. The air gap side of the trapezoidal teeth is the short side, and each trapezoid An axial circular through hole is set in the middle of the root of the tooth;

The armature winding is set on the parallel teeth, and the armature winding is composed of single-layer coils connected in series or in parallel, and the coils are square.

The advantages of the present invention are:

The motor of the present invention opens a circular through hole on the armature core as the cooling channel of the motor, which has a high space utilization rate and does not cause an increase in the volume of the motor. It can be used as a motor or as a generator, and has broad application potential Application prospects.

According to the characteristics of the magnetic circuit of the motor, the present invention cleverly arranges the cooling medium passage inside the motor, which improves the space utilization rate inside the motor; this cooling method greatly improves the cooling capacity, thereby effectively improving the power density of the motor; at the same time , due to the single-layer centralized molding coil, the insulation of the winding is simple, the slot fullness rate is high, the fault tolerance is strong, the manufacturing cost is low, and the thermal resistance between the winding and the core is small, which can reduce the copper loss of the winding, improve the efficiency of the motor, and further reduce the motor. temperature rise.

Description of drawings

Fig. 1 is a schematic structural view of a stator of the present invention; Fig. 2 is a schematic structural view of a motor stator described in Embodiment 2; Fig. 3 is a schematic structural view of a motor stator described in Embodiment 3; Fig. 4 is a schematic structural view of an armature winding coil; Fig. 5 is a structural schematic diagram of the existing motor external casing pipeline cooling method; FIG. 6 is a structural schematic diagram of the existing motor internal winding pipeline cooling method.

Detailed ways

Specific Embodiment 1: The present embodiment will be described below in conjunction with FIG. 1 and FIG. 4. This embodiment includes a stator and a rotor, and there is an air gap between the stator and the rotor.

The stator includes an armature core 1-1 and an armature winding 1-2,

The air-gap side surface of the armature core 1-1 is a tooth-alveolar structure, and a plurality of parallel slots 1-11 form the spaced arrangement of parallel teeth 1-12 and trapezoidal teeth 1-13 on the air-gap side surface of the armature core 1-1 , the side of the air gap of the trapezoidal teeth 1-13 is a short side, and an axial circular through hole 1-14 is arranged in the middle of the tooth root of each trapezoidal tooth 1-13;

The armature winding 1-2 is sleeved on the parallel teeth 1-12, and the armature winding 1-2 is composed of concentratedly formed single-layer coils connected in series or in parallel, and the coils are square.

The motor described in this embodiment is a rotating motor, the armature core 1-1 is cylindrical, a plurality of parallel slots 1-11 are arranged in the axial direction, and the side surfaces on both sides of each parallel slot 1-11 are parallel planes. A parallel tooth 1-12 is formed between two adjacent parallel grooves 1-11 that are parallel to each other, and a trapezoidal tooth 1-13 is formed between two adjacent but non-parallel parallel grooves 1-11. The air gap side of -13, that is, the addendum side is the short side, and the side on the dedendum side is the long side. No cooling structure is embedded in the circular through-holes 1-14, which are only used as axial ventilation passages, and the motor is air-cooled or naturally cooled.

The rotor is mainly composed of permanent magnets, yokes and shafts.

Specific Embodiment Two: The present embodiment will be described below in conjunction with FIG. 2. The difference between this embodiment and Embodiment 1 is that the stator also includes a cooling pipe 1-3, and each circular through hole 1-14 is embedded with a cooling pipe. 1-3, adjacent cooling pipes 1-3 along the circumferential direction are serpentinely connected in series on both sides of the armature core 1-1 to form a cooling pipe. Other components and connections are the same as those in Embodiment 1.

The cooling pipes formed by the cooling pipes 1-3 connected in series can pass into the cooling liquid to cool the motor. This high-performance cooling method can greatly improve the cooling capacity of the motor, thereby effectively increasing the power density of the motor.

Specific Embodiment Three: The present embodiment will be described below in conjunction with FIG. 3 . The difference between this embodiment and Embodiment 1 is that the stator also includes a cooling pipe 1-3 and a plurality of heat-conducting heat pipes, and the end surfaces on both sides of the armature core 1-1 An annular cooling pipe 1-3 is respectively fixed at the circumference formed by the circular through hole 1-14;

A heat conduction heat pipe is embedded in each circular through hole 1-14, and the two ends of the heat conduction heat pipe are two cold ends, one cold end is embedded in a cooling pipe 1-3, and the other cold end is embedded in another Inside the cooling tube 1-3. Other components and connections are the same as those in Embodiment 1.

The cooling pipes 1-3 are filled with cooling fluid. The heat conduction heat pipe is an internal vacuum structure, and the boiling point of the liquid inside is extremely low. When the motor temperature rises to vaporize the liquid, the steam will bring heat to the top of the heat conduction heat pipe. After being cooled by the cooling pipes 1-3, the condensed liquid flows to the bottom of the heat conduction heat pipe again, absorbs heat and then evaporates, repeating the cycle in this way to achieve the purpose of cooling the inside of the motor.

Embodiment 4: The difference between this embodiment and Embodiment 1 is that the motor is a three-phase motor, and the tooth pitch between adjacent parallel teeth 1-12 and trapezoidal teeth 1-13 is the pole pitch of the rotor permanent magnet. Two-thirds or four-thirds times, the tooth height of the parallel teeth 1-12 is greater than or equal to the tooth height of the trapezoidal teeth 1-13. Other components and connections are the same as those in Embodiment 1.

Embodiment 5: The difference between this embodiment and Embodiment 1 lies in that the tooth width of the parallel teeth 1-12 is greater than the tooth tip width of the trapezoidal teeth 1-13. Other components and connections are the same as those in Embodiment 1.

Embodiment 6: The difference between this embodiment and Embodiment 1 is that the width of the tooth tip of the trapezoidal teeth 1-13 is 0.4 to 0.9 times of the tooth width of the parallel teeth 1-12. Other components and connections are the same as those in Embodiment 1.

Embodiment 7: This embodiment differs from Embodiment 1 in that the diameter of the circular through hole 1-14 is smaller than the difference between the lengths of the lower base and the upper base of the trapezoidal teeth 1-13. Other components and connections are the same as those in Embodiment 1.

Embodiment 8: This embodiment differs from Embodiments 1, 2, 3, 4, 5, 6 or 7 in that the motor is an inner rotor structure or an outer rotor structure. The other components and connections are the same as those of Embodiments 1, 2, 3, 4, 5, 6 or 7.

Embodiment 9: The difference between this embodiment and the motor described in Embodiment 7 is that the motor described in this embodiment has an inner rotor structure. The stator is mainly composed of an armature core 1-1, an armature winding 1-2 and a cooling pipe 1-3. The armature core 1-1 is cylindrical, and the inner surface of the armature core 1-1 is provided with 24 parallel slots 1-11 along the shaft, and 12 parallel teeth 1 are formed between adjacent parallel slots 1-11. -12 and 12 trapezoidal teeth 1-13, the armature core 1-1 has 12 circular through holes 1-14, each circular through hole 1-14 is embedded with a cooling pipe 1-3, along the circumference The adjacent cooling pipes 1-3 in the same direction are serpentinely connected in series on both sides of the armature core 1-1 to form a cooling pipe, and cooling liquid is passed into the cooling pipe to cool the motor. The rotor is mainly composed of permanent magnets, yokes and shafts.

The present invention is not limited to the above-mentioned embodiments, and may also be a reasonable combination of the technical features described in the above-mentioned embodiments.

Claims (8)

1. permanent magnet synchronous motor with high-power density, it comprises stator and rotor, is air gap between stator and the rotor, it is characterized in that:

Stator comprises armature core (1-1) and armature winding (1-2),

The air gap side surface of armature core (1-1) is the teeth groove structure, a plurality of parallel slots (1-11) form being spaced of parallel teeth (1-12) and stepped tooth (1-13) with the air gap side surface of armature core (1-1), the air gap side of stepped tooth (1-13) is a minor face, and axial manhole (1-14) is set in the middle of the tooth root portion of each stepped tooth (1-13);

Armature winding (1-2) is sleeved on the parallel teeth (1-12), and armature winding (1-2) is in series or in parallel to form by single layer coil, and described coil is square.

2. permanent magnet synchronous motor with high-power density according to claim 1, it is characterized in that: stator also comprises cooling water pipe (1-3), the embedded cooling water pipe (1-3) that is placed with of each manhole (1-14), adjacent cooling water pipe (1-3) along the circumferential direction forms a cooling pipe in the snakelike series connection of the both sides end face of armature core (1-1).

3. permanent magnet synchronous motor with high-power density according to claim 1, it is characterized in that: stator also comprises cooling water pipe (1-3) and a plurality of heat conduction heat pipe, and the cooling water pipe (1-3) of an annular is fixed at the circumference place that is formed by manhole (1-14) on the both sides end face of armature core (1-1) respectively;

Embed a heat conduction heat pipe in each manhole (1-14), the two ends of heat conduction heat pipe are two cold junctions, and cold junction embeds in the cooling water pipe (1-3), and another cold junction embeds in another cooling water pipe (1-3).

4. permanent magnet synchronous motor with high-power density according to claim 1, it is characterized in that described motor is a three phase electric machine, tooth pitch between adjacent parallel tooth (1-12) and the stepped tooth (1-13) is 2/3rds or 4/3rds times of rotor permanent magnet pole span, and the tooth depth of parallel teeth (1-12) is more than or equal to the tooth depth of stepped tooth (1-13).

5. permanent magnet synchronous motor with high-power density according to claim 1 is characterized in that: the facewidth of described parallel teeth (1-12) is greater than the addendum width of stepped tooth (1-13).

6. linear permanent magnet synchronous motor according to claim 1 is characterized in that: the addendum width of described stepped tooth (1-13) is 0.4 to 0.9 times of parallel teeth (1-12) facewidth.

7. permanent magnet synchronous motor with high-power density according to claim 1 is characterized in that: the diameter of described manhole (1-14) is poor less than the length on the bottom of stepped tooth (1-13) and last base.

8. according to claim 1,2,3,4,5,6 or 7 described permanent magnet synchronous motor with high-power density, it is characterized in that: described motor is inner rotor core or outer-rotor structure.

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