JP3053156U - Permanent magnet type high efficiency synchronous motor - Google Patents

Abstract

(57) [Summary] [Problem] To provide a permanent magnet type high efficiency synchronous motor. SOLUTION: This is a high-efficiency synchronous motor using a permanent magnet made of a neodymium iron boron rare earth material, and the motive motor is composed of a stator and a rotor. The stator coil has a y-shaped structure connected to the air gap to achieve reliability and reduced volume of operation, and a straight groove structure is adopted for the iron core of the rotor. A single-car closing groove is employed, the magnet steel groove has a T-shaped structure, and a combined excitation magnetic circuit formed by combining magnet steel is formed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a type of permanent magnet type high efficiency synchronous motor, and more particularly to a high efficiency synchronous motor using a permanent magnet made of neodymium iron boron as a stator.

[0002]

[Prior art]

 Electric motors have the advantages of simple structure, reliable operation, and low cost, and are currently used for powering more than 75% of rotating machines. However, a relatively large excitation current is required, the efficiency is relatively low, and the efficiency of small and medium-sized motors is not very high, leading to a decrease in the utilization rate and insufficient use of electric energy. Also have.

[0003] Among the existing synchronous motors, those using an iron-oxygen permanent magnet for the magnet steel all have the following common drawbacks. 1. The motor itself could not start itself, and could not operate normally unless it was started by the starter. 2. The volume and weight were large, and the manufacturing cost was high. 3. Driving was not reliable. 4. The induction motor could not be replaced directly with the relatively widely used y-series induction motor due to differences in model, mounting seat and mounting dimensions.

[0004]

[Problems to be solved by the invention]

 An object of the present invention is to provide a rare-earth permanent magnet type high-efficiency synchronous motor that has a self-starting ability, is highly efficient, has a high power saving rate, has a reliable operation, and can be directly substituted for an induction motor. And

[0005]

Means for Solving the Problems The invention of claim 1 includes a stator 1 and a rotor 2, wherein the stator 1 includes a casing 11, a stator core 12, a stator groove 13, and a stator coil 14. 2 includes a starting cage 21, a rotor core 22, a rotor groove 23, a magnet steel groove 22, a magnet steel 25, and a rotor shaft 26. Among them, the casing 11 includes the most widely used y-series induction motor type and mounting. Designed according to the seat number and mounting dimensions, but not open, the stator core 12 has a sloping groove structure, the stator coil 14 employs a y-shaped connection, and the number of coil turns is a permanent magnetic field. Is determined to be 0.85 to 0.95 UN (rated voltage), and the gap between the stator 1 and the rotor 2 is assumed to be able to operate smoothly. The rotor core 22 has a straight groove structure, the rotor groove 23 has a single cage closing groove structure, and the cross-sectional area thereof can secure a sufficient starting torque. It has a T-shaped structure and is symmetrically distributed outside the rotor shaft 26. Three magnet steels 27, 28 and 29 are installed in each magnet steel groove 24, and one of the magnet steels 27 is a T-shaped magnet. The permanent magnet type high-efficiency synchronous motor having the above configuration, which is placed in the radial groove of the steel groove and the remaining two magnetic steels 28 and 29 are placed in the tangential groove of the T-shaped magnetic steel groove. And

[0006] The invention of claim 2 is that the magnet steel in the radial groove of the magnet steel groove 24 is tangentially excited, and the two tangential magnet steels are radially excited, and when necessary, further on the end face. A permanent magnet type high efficiency synchronous motor according to claim 1, wherein a magnet is added to form an axial excitation, thus exhibiting a composite excitation type.

The invention according to claim 3 is the permanent magnet type high-efficiency synchronous motor according to claim 1, wherein the magnet steels 27, 28, and 29 are all made of rare earth neodymium iron boron permanent magnet material.

The invention according to claim 4 is the permanent magnet type high-efficiency synchronous motor according to claim 1, wherein the stator core 12 and the rotor core 22 are made of high-magnetism, low-wear silicon steel pieces.

[0009]

[Embodiment of the invention]

 The present invention provides a high-efficiency synchronous motor that uses a permanent magnet made of a neodymium iron boron rare earth material, and the motive motor is a combination of a stator and a rotor. The stator coil employs a structure that connects to the air gap in a y-shape to achieve operational reliability and reduce volume. The rotor iron core employs a straight groove structure, and the rotor groove A single cage closing groove is adopted as the shape, the magnet steel groove has a T-shaped structure, and a composite excitation magnetic circuit formed by combining magnetic steel is formed. The present invention not only has high efficiency, but also has strong overload capability, high power saving effect, and automatic starting capability, can operate synchronously with load, and can be directly substituted for induction motor.

[0010]

【Example】

 Please refer to FIG. The permanent magnet type high-efficiency synchronous motor of the present invention includes a stator 1 and a rotor 2. The stator 1 includes a casing 11, a stator core 12, a stator groove 13, and a stator coil 14. The core 22, the rotor groove 23, the magnet steel groove 22, the magnet steel 25, and the rotor shaft 26 are included.

[0011] Among them, the casing 11 is designed according to the type, mounting sheet number and mounting dimensions of the most popular y-series induction motor, but it is not open type, so that it is directly known. It can be replaced with an induction motor.

The stator core 12 has an oblique groove structure, and is formed by laminating high magnetic conductivity, low wear silicon steel pieces and pressing them together.

The stator coil 14 employs a y-shaped connection, and the number of turns of the coil is determined so that the sensitive electric power generating the permanent magnetic field is 0.85 to 0.95 UN (rated voltage). Therefore, wear due to leakage can be reduced.

The rotor core 22 has a straight groove structure, and is formed by laminating high magnetic conductivity, low wear silicon steel pieces and pressing them together.

The rotor groove 23 has a single cage closing groove structure, and has a cross-sectional area capable of securing a sufficient starting torque, and allows the electric motor to start smoothly under a load condition and to synchronize. .

The magnet steel grooves 24 in the rotor 2 have a T-shaped structure, and the magnet steel grooves 24 are symmetrically distributed outside the rotor shaft 26. Each magnet steel groove 24 is provided with three magnet steels 27, 28, 29, wherein the magnet steel 27 is placed in the radial groove of the T-shaped magnet steel groove, and the magnet steels 28, 29 are provided. It is symmetrically located in the tangential groove of the T-shaped magnet steel groove. Each of the three magnet steels 27, 28, and 29 is made of a rare earth neodymium iron boron permanent magnet material, and as can be seen from the structure of the magnet steel groove 24 and the magnet steels 27, 28, and 29, as described above. The magnetic circuit of the motor is a composite excitation magnetic circuit, and magnet steel is attached to the end face when necessary to form axial excitation. Among them, the magnet steel 27 performs tangential excitation and forms a parallel magnet steel circuit, and the magnetic steels 28 and 29 perform radial excitation to form a series magnetic circuit. Since the composite excitation magnetic circuit has no isolation groove, the magnetic leakage is relatively small, and the utilization rate and the magnetic permeability of the magnet steel can be greatly increased. In addition, the design has been improved to use the arrangement of magnet steel in parallel and in series. Comparing the radially excited series magnetic circuit (FIG. 2), the tangentially excited parallel magnetic circuit (FIG. 3) and the x-type magnetic circuit (FIG. 4) in the well-known technology, the present invention has a small leakage and a large magnetic permeability. In addition, the maximum utilization rate of the unit magnet steel can be obtained, and the electric energy and the maximum output efficiency of the motor can be greatly increased.

[0017]

[Effects of the Invention] Compared with known technologies, the present invention has the following advantages. 1. The motor of the present invention has sufficient synchronous torque during the starting process, and it is assumed that the motor starts smoothly and operates synchronously under load conditions, and is highly efficient and can be operated under high load conditions. . 2. Compared with the induction motor of the same model number, the efficiency is increased by 5 to 9%, the efficiency factor is set to 30% or more, the starting torque is increased by 30%, and the temperature rise is reduced to 40 ° C. 3. The power saving effect is high, and the power saving rate is 12 to 15% or more. 4. Small in volume, light in weight, reliable in operation, convenient for installation and transportation. 5. It can be replaced with a direct induction motor.

Taken together, the present invention provides a permanent magnet type high efficiency synchronous motor which overcomes the shortcomings of similar technologies known for isolation, is a kind of higher efficiency, and is directly compatible with known induction motors. It offers a new alternative motor design.

[Brief description of the drawings]

FIG. 1 is a structural view of a rare earth permanent magnet synchronous motor of the present invention.

FIG. 2 is a diagram showing a magnetic circuit for connecting a radial excitation stake in a known technique.

FIG. 3 is a schematic diagram of a tangential excitation tangent magnetic circuit in a known technique.

FIG. 4 is a schematic view of an x-type magnetic circuit according to a known technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 11 Casing 12 Stator iron core 13 Stator groove 14 Stator coil 2 Rotor 21 Starting cage 22 Rotor iron core 23 Rotor groove 24 Magnet steel groove 25 Magnet steel 26 Rotor shaft 27 Magnet steel 28 Magnet steel 29 Magnet steel 3 Tangential magnet steel circuit 4 Radial magnet steel circuit 5 Isolation groove 6 Magnetic steel 7 Magnetic leakage

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[Procedure amendment]

[Submission date] May 12, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

Claims (4)

[Utility model registration claims] A stator includes a casing, a stator core, and a stator groove.
3 and a stator coil 14, the rotor 2 includes a starting cage 21, a rotor core 22, a rotor groove 23, and a magnet steel groove 2.
2. Includes magnet steel 25 and rotor shaft 26, in which casing 11 is designed according to the type, mounting sheet number and mounting dimensions of the most widespread y-series induction motor, but is open. The stator core 12 has an oblique groove structure, and the stator coil 1
4 adopts a y-shaped connection, the number of coil turns is 0.85 to 0.95 UN (rated voltage)
Is determined so that the gap between the stator 1 and the rotor 2 can be smoothly operated, the rotor core 22 has a straight groove structure, and the rotor groove 23 has a single cage closing groove. The magnet steel groove 24 has a T-shaped structure and is symmetrically distributed outside the rotor shaft 26. Each magnet steel groove 24 has three magnets. Steels 27, 28, 29 are installed, one of which is placed in the radial groove of the T-shaped magnetic steel groove, and the other two magnetic steels 28, 29 are of the T-shaped magnetic steel groove. A permanent magnet type high-efficiency synchronous motor of the above configuration, which is placed in a tangential groove. 2. The magnet steel in the radial groove of the magnet steel groove 24 is excited tangentially, the two magnet steels in the tangential direction are excited radially, and further magnets are added on the end face when necessary. 2. The permanent magnet type high efficiency synchronous motor according to claim 1, wherein the permanent magnet type high-efficiency synchronous motor is adapted to form an axial excitation and thus exhibits a composite excitation type. 3. The magnet steel 27, 28, 29, each made of rare earth neodymium iron boron permanent magnet material.
2. A permanent magnet type high efficiency synchronous motor according to item 1. 4. The permanent magnet type high-efficiency synchronous motor according to claim 1, wherein the stator core 12 and the rotor core 22 are made of a high magnetic permeability and low wear silicon steel piece.