CN107154710B - Serial design method for variable-frequency power supply speed regulation permanent magnet synchronous motor - Google Patents
Serial design method for variable-frequency power supply speed regulation permanent magnet synchronous motor Download PDFInfo
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- CN107154710B CN107154710B CN201710408279.0A CN201710408279A CN107154710B CN 107154710 B CN107154710 B CN 107154710B CN 201710408279 A CN201710408279 A CN 201710408279A CN 107154710 B CN107154710 B CN 107154710B
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Abstract
The invention discloses a series design method of a variable-frequency power supply speed regulation permanent magnet synchronous motor, which selects an adaptive machine base number according to the requirements of power and rotating speed, adopts stator and rotor punching sheets with the same pole number and the same size for the same machine base number, selects corresponding power supply frequency according to the difference of designed rated rotating speed, further determines the thickness of a silicon steel sheet, the magnetic density of an iron core and the width of a permanent magnet in sequence, and realizes series design according to the analog rule of motor design. The invention is beneficial to shortening the design and trial-manufacture period of the speed-regulating permanent magnet synchronous motor, reducing the number of moulds, improving the universality of motor parts and being convenient for popularization and application.
Description
Technical Field
The invention relates to a series design method of a variable-frequency power supply speed regulation permanent magnet synchronous motor.
Background
Along with the aggravation of the energy crisis and the gradual deterioration of the ecological environment, the electricity has two major hotspots in the world at present, namely high efficiency, energy conservation, cleanness and environmental protection. In the field of energy power, the efficient and energy-saving permanent magnet synchronous motor is used as a power driving source, meets the target requirements of low-carbon and green economic development of the current society, and becomes a new trend for the development of future manufacturing industry. In recent years, the development of efficient energy-saving permanent magnet synchronous motors is greatly promoted in our country, and the national development committee publishes a twelve-five planning outline in 2011, and particularly emphasizes in a ten-key energy-saving engineering implementation suggestion: the energy-saving engineering of a propulsion motor system, the popularization of a high-efficiency energy-saving rare earth permanent magnet motor, and the popularization of advanced motor speed regulation technologies such as variable frequency speed regulation, permanent magnet motor speed regulation and the like. Under the strong support of the country, the market demand of the high-efficiency motor is rapidly increased. In order to meet the development needs of the market, the state continuously publishes design standards of permanent magnet synchronous motors, namely 12 months 2008, and the state publishes technical conditions (machine seat numbers 132-280) of high-efficiency three-phase permanent magnet synchronous motors of GBT22711-2008, and the design standards begin to be implemented at 10 months 2009. In 12 months in 2011, the state also promulgates design standards for permanent magnet synchronous motors, namely GBT27744-2011 technical conditions (machine seats 132-280) for ultra-efficient three-phase permanent magnet synchronous motors, and the design standards are implemented at 5 months in 2012. In 2013, the energy efficiency standard of the permanent magnet synchronous motor is released by the country, the energy efficiency level of the permanent magnet synchronous motor is specified, and the standard is implemented in 9 months in 2014.
At present, the design of the speed-regulating permanent magnet synchronous motor is mainly carried out by referring to an asynchronous motor, and the specifications are various. With the expansion of the application market of the speed-regulating permanent magnet synchronous motor, the development and design of the speed-regulating permanent magnet synchronous motor which is standard, efficient, universal and serialized becomes a need. The advantages of the design of a series of motors are fully exerted, the universality of motor parts is improved, and the complexity of a manufacturing process is reduced, so that the manufacturing cost of the motor is reduced, the development of the motor industry is greatly promoted, and the competitiveness of motor products in China in the international market is improved.
Disclosure of Invention
The invention provides a series design method of a variable-frequency power supply speed regulation permanent magnet synchronous motor, aiming at solving the problems, and the invention can shorten the design and trial-manufacture period of the speed regulation permanent magnet synchronous motor, reduce the number of moulds, improve the universality of motor parts, simplify the process of motor batch production, improve the mechanization and automation of production, improve the product quality and reduce the production cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a series design method for a variable-frequency power supply speed regulation permanent magnet synchronous motor selects an adaptive base number according to the requirements of power and rotating speed, adopts the same pole number and the same size of stator and rotor punching sheets for the same base number, selects corresponding power supply frequency according to the difference of designed rated rotating speed, further determines the thickness of silicon steel sheets, the magnetic density of an iron core and the width of a permanent magnet in sequence, and realizes series design according to the analog rule of motor design.
Further, for motors with the same power and different rotating speeds, the analogy law of the designed iron core length is as follows: when the rotating speed of the motor is more than 1000r/min, namely the frequency is more than 50Hz, the materials of the iron core punching sheets of the motor are the same, and silicon steel sheets with the same thickness H1 are adopted.
When the motor speed is greater than 1000r/min, the product of the length, the frequency and the air gap flux density amplitude of the series of motors is a fixed value.
When the rotating speed of the motor is less than or equal to 1000r/min, the punching sheet materials of the iron core all adopt silicon steel sheets with the same thickness H2, and the magnetic density values of the motor are the same.
And H2 is less than H1.
When the rotating speed of the motor is less than or equal to 1000r/min, the product of the length and the frequency of the motor is a fixed value.
Further, for motors with the same power and different rotating speeds, the analogy law of the number of designed winding turns is as follows:
the winding turns of series motors with the same power and different rotating speeds are the same.
Further, for motors with the same rotating speed and different powers, the analogy rule of the core length is that when the rotating speed is the same and the power is different, the core length of the motor is in direct proportion to the power of the motor.
For motors with the same rotating speed and different powers, the analogy law of the number of winding turns is that the number of winding turns of the motors with the same rotating speed and different powers is inversely proportional to the length of a motor iron core.
Compared with the prior art, the invention has the beneficial effects that: the invention can shorten the design and trial-manufacture period of the speed-regulating permanent magnet synchronous motor, further improve the universality of motor parts, simplify the process of motor batch production, improve the mechanization and automation degree of production, be beneficial to improving the product quality and reduce the production cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of an internal speed regulation permanent magnet synchronous motor designed by the invention;
wherein: 1-a stator; 2-a rotor; 3-a permanent magnet; 4-axis.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For the same engine base number, the same pole number and slot number are adopted, and stator and rotor punching sheets with the same size are adopted; and if the rotating speeds of the motors are different, the power supply frequency is different.
A design method of a variable-frequency power supply speed regulation permanent magnet synchronous motor series comprises the following steps:
(1) selecting an applicable machine seat number according to the requirements of power and rotating speed;
(2) for the same engine base number, adopting stator and rotor punching sheets with the same pole number and the same size;
(3) selecting different power supply frequencies according to different designed rated rotating speeds;
(4) the thickness (0.35mm or 0.5mm) of the silicon steel sheet is reasonably selected according to different power supply frequencies;
(5) selecting reasonable iron core magnetic density according to the requirement of iron loss density;
(6) selecting proper width of the permanent magnet according to the requirement of the magnetic density of the iron core;
(7) according to the analogy rule of motor design, the motor is designed in series.
The serialized design rule of the speed-regulating permanent magnet synchronous motor is as follows:
(1) design criterion of motors with same power and different rotating speeds
A. Analogy law of core length
When the rotating speed of the motor is more than 1000r/min, namely the frequency is more than 50Hz, the materials of the iron core punching sheets of the motor are the same, and 0.35mm silicon steel sheets are adopted. In this case, the product of the length, frequency and air gap flux density of the series of motors is a constant value, so that the analog law of the core length is obtained
When the rotating speed of the motor is less than or equal to 1000r/min, the punching sheet materials of the iron core are all silicon steel sheets with the thickness of 0.5mm, the magnetic density values of the motor are the same, and under the condition, the product of the length and the frequency of the motor is a fixed value, so that the motor can obtain the product
The length of the motor is 1000r/min (50Hz) as a reference length L0The length L at each rotational speed is
B. Analogy law of winding turns
The winding turns of series motors with the same power and different rotating speeds are the same.
(2) Design rule of motors with same rotating speed and different powers
A. Analogy law of core length
When the rotating speeds are the same and the power is different, the length of the iron core of the motor is in direct proportion to the power of the motor.
B. Analogy law of winding turns
The number of winding turns of the motor with the same rotating speed and different power is inversely proportional to the length of the motor core.
As shown in fig. 1, the design method of the variable-frequency power supply speed-regulating permanent magnet synchronous motor series adopts the same number of poles and slots and the same size of stator and rotor punching sheets for the same base number; and if the rotating speeds of the motors are different, the power supply frequency is different. A specific implementation method is provided below by combining a 160-base motor design example.
Example (c): 160 machine base motor design
160 machine base motors have 18 specifications. Table 1 shows the correspondence between the number of the engine base and the power.
TABLE 1160 corresponding relationship between engine base number, rotation speed and power
The number of poles of a 160-machine-base motor is 6, the number of grooves is 36, and the rotor structure is a V-shaped built-in structure. Silicon steel sheets with different thicknesses are selected according to different power supply frequencies, and details are shown in table 2.
In order to ensure that the iron loss densities of the motors with different rotating speeds are the same, the electromagnetic parameters of the motors with different frequencies are taken as a reference, and the electromagnetic parameters of the motors with different frequencies meet the formula (4), so that the iron core magnetic densities of the motors with different frequencies can be determined. Core flux density B of 50Hz motor in consideration of saturation of motor corebAs the maximum magnetic density, the magnetic density calculated by the formula (4) is larger than BbWhen pressing according to BbAnd (4) taking values. The magnetic densities of the iron cores corresponding to different frequencies are detailed in table 2.
According to the requirement of the magnetic density of the iron core, the proper width of the permanent magnet is selected, and the details are shown in table 2.
TABLE 2 electromagnetic parameters corresponding to different frequencies
According to a series design rule, a 160-machine-base motor is designed, and the design schemes of the permanent magnet synchronous motor with the speed regulation of 18.5kW, 15kW, 11kW, 7.5kW and 5.5kW are shown in tables 3 to 7.
Design scheme of permanent magnet synchronous motor with 318.5 kW-shaped speed regulation
Design scheme of table 415 kW speed-regulating permanent magnet synchronous motor
Design scheme of permanent magnet synchronous motor with meter 511 kW speed regulation
Design scheme of table 67.5 kW speed-regulating permanent magnet synchronous motor
Design scheme of permanent magnet synchronous motor with 75.5 kW of table speed
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (2)
1. A series design method for a variable-frequency power supply speed regulation permanent magnet synchronous motor is characterized by comprising the following steps: according to the requirements of power and rotating speed, selecting an adaptive machine base number, adopting stator and rotor punching sheets with the same pole number and the same size for the same machine base number, selecting corresponding power supply frequency according to the difference of designed rated rotating speed, further sequentially determining the thickness of silicon steel sheets, the magnetic density of an iron core and the width of a permanent magnet, and realizing the serialization design according to the analog rule of motor design;
the serialized design criteria of the speed-regulating permanent magnet synchronous motor comprise the following steps:
under the design of motors with the same power and different rotating speeds or the same rotating speed and different powers, the motor design comprises an analogy law of the length of an iron core and an analogy law of the number of turns of a winding;
for motors with the same power and different rotating speeds, the analogy law of the designed iron core length is as follows: when the rotating speed of the motor is more than 1000r/min and the frequency is more than 50Hz, the materials of the iron core punching sheets of the motor are the same, silicon steel sheets with the same thickness H1 are adopted,
the product of the length, the frequency and the air gap flux density amplitude of the series of motors is a fixed value;
when the rotating speed of the motor is less than or equal to 1000r/min, the punching sheet materials of the iron core all adopt silicon steel sheets with the same thickness H2, the values of the iron core magnetic density and the air gap magnetic density of the motor are the same, and the product of the length and the frequency of the motor is a fixed value;
for motors with the same power and different rotating speeds, the analogy law of the number of designed winding turns is as follows:
the winding turns of series motors with the same power and different rotating speeds are the same;
for motors with the same rotating speed and different powers, the analogy rule of the length of the iron core is that when the rotating speed is the same and the power is different, the length of the iron core of the motor is in direct proportion to the power of the motor;
for motors with the same rotating speed and different powers, the analogy law of the number of winding turns is that the number of winding turns of the motors with the same rotating speed and different powers is inversely proportional to the length of a motor iron core.
2. The serialized design method of the variable-frequency power supply speed regulation permanent magnet synchronous motor according to claim 1, is characterized in that: and H2 is greater than H1.
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