CN-115189489-B - Method and system for determining pole grooves of integrated winding bearingless permanent magnet motor

CN115189489BCN 115189489 BCN115189489 BCN 115189489BCN-115189489-B

Abstract

The invention discloses a pole slot determining method and a pole slot determining system for an integrated winding bearingless permanent magnet motor, which relate to the technical field of motor design, wherein the method comprises the steps of determining the number of unit motors of the bearingless permanent magnet motor to be designed relative to a torque winding based on an integrated winding levitation force generating principle; based on the alternating current winding theory, the number of slots of the bearingless permanent magnet motor to be designed is determined according to the pole pair number of the rotor and the number of unit motors, and the bearingless permanent magnet motor is obtained according to the pole pair number of the rotor and the number of slots. The invention can realize the design of the integrated winding bearingless permanent magnet motor, thereby obtaining a miniaturized motor structure.

Inventors

GENG WEIWEI
WU CAIQUAN

Assignees

南京理工大学

Dates

Publication Date: 20260508
Application Date: 20220721

Claims (4)

1. The method for determining the pole slot of the integrated winding bearingless permanent magnet motor is characterized by comprising the following steps of: determining the number of unit motors of the bearingless permanent magnet motor to be designed relative to the torque winding based on the integrated winding levitation force generation principle; based on an alternating current winding theory, determining the number of grooves of the bearingless permanent magnet motor to be designed according to the number of pole pairs of the rotor of the bearingless permanent magnet motor to be designed and the number of unit motors; obtaining a bearingless permanent magnet motor according to the pole pair number of the rotor and the groove number; The method for determining the number of the unit motors of the bearingless permanent magnet motor to be designed relative to the torque winding based on the integrated winding levitation force generation principle specifically comprises the following steps: If the pole pair number of the rotor of the bearingless permanent magnet motor to be designed is p, determining that the unit motor number of the bearingless permanent magnet motor to be designed relative to the torque winding is 2, wherein p=4n, n=3a±1, a=0, 1, 2; The method for determining the number of slots of the bearingless permanent magnet motor to be designed based on the alternating current winding theory according to the number of pole pairs of the rotor of the bearingless permanent magnet motor to be designed and the number of unit motors specifically comprises the following steps: Determining a first calculation formula and a second calculation formula by adopting an alternating-current winding theory according to the pole pair number of the rotor and the unit motor number; wherein, the first calculation formula is: ; q is the number of slots of each pole and each phase, Z is the number of slots of the bearingless permanent magnet motor to be designed, and p is the pole pair number of the rotor; After about division into N 1 is a sub-divided numerator, D is a sub-divided denominator, D=1 when q represents an integer slot, N 1 =q, D is not equal to 1 when q represents a fractional slot, and N 1 and D are not common divisor; the second calculation formula is as follows: ; t 1 is the number of unit motors; substituting the pole pair number of the rotor of the bearingless permanent magnet motor to be designed and the unit motor number into the second calculation formula to obtain a value of denominator after about division; substituting the value of the denominator after about division and the pole pair number of the rotor of the bearingless permanent magnet motor to be designed into the first calculation formula to determine the number of grooves of the bearingless permanent magnet motor to be designed.
2. The method for determining pole grooves of an integrated winding bearingless permanent magnet motor according to claim 1, wherein the number of grooves of the bearingless permanent magnet motor to be designed is 12n+6, n is greater than or equal to 0, and n is an integer.
3. A pole slot determination system for an integrated winding bearingless permanent magnet motor, comprising: The unit motor number determining module is used for determining the unit motor number of the bearingless permanent magnet motor to be designed relative to the torque winding based on the integrated winding levitation force generation principle; The groove number range determining module is used for determining the groove number of the bearingless permanent magnet motor to be designed according to the pole pair number of the rotor of the bearingless permanent magnet motor to be designed and the unit motor number based on an alternating current winding theory; The bearingless permanent magnet motor design module is used for obtaining bearingless permanent magnet motors according to the pole pair numbers of the rotors and the groove numbers; The unit motor number determining module specifically comprises: A unit motor number determining unit for determining that the number of unit motors of the bearingless permanent magnet motor to be designed relative to the torque winding is 2 if the pole pair number of the rotor of the bearingless permanent magnet motor to be designed is p, wherein p=4n, n=3a±1, a=0, 1, 2; The slot number range determining module specifically comprises: A calculation formula determining unit for determining a first calculation formula and a second calculation formula from the pole pair number of the rotor and the unit motor number using an alternating current winding theory; wherein, the first calculation formula is: ; q is the number of slots of each pole and each phase, Z is the number of slots of the bearingless permanent magnet motor to be designed, and p is the pole pair number of the rotor; After about division into N 1 is a sub-divided numerator, D is a sub-divided denominator, D=1 when q represents an integer slot, N 1 =q, D is not equal to 1 when q represents a fractional slot, and N 1 and D are not common divisor; the second calculation formula is as follows: ; t 1 is the number of unit motors; The denominator value determining unit is used for substituting the pole pair number of the rotor of the bearingless permanent magnet motor to be designed and the unit motor number into the second calculation formula to obtain the denominator value after the denominator; And the groove number determining unit is used for substituting the value of the denominator after the reduction and the pole pair number of the rotor of the bearingless permanent magnet motor to be designed into the first calculation formula to determine the groove number of the bearingless permanent magnet motor to be designed.
4. The pole slot determination system of an integrated winding bearingless permanent magnet motor of claim 3, wherein the number of slots of the bearingless permanent magnet motor to be designed is 12n+6, wherein n is greater than or equal to 0, and n is an integer.

Description

Method and system for determining pole grooves of integrated winding bearingless permanent magnet motor Technical Field The invention relates to the technical field of motor design, in particular to a pole groove determining method and a pole groove determining system for an integrated winding bearingless permanent magnet motor. Background The traditional motor adopts a mechanical bearing to support the rotor, and the motor can generate larger friction force between the mechanical bearing and the rotor during high-speed running, so that adverse effects such as increased motor abrasion, increased temperature, reduced service life of the motor, reduced stability of a motor system and the like are caused. The bearingless motor has the advantages of no bearing abrasion, no bearing noise, no lubrication and the like, and has compact structure, high power density, low system cost and easy realization of high rotating speed and high power. Compared with the traditional motor, the bearingless motor can realize stable rotation and stable suspension by additionally adding a set of suspension force windings which are +/-1 from the pole pair number of the torque windings in a stator slot which only comprises one set of torque windings and adjusting the current magnitude and the phase in the two sets of windings. However, because the two sets of windings occupy limited stator slot space together and the winding direction and the lap winding position are strictly limited, the difficulty of the motor stator and rotor structure design and manufacturing process is improved, the power loss of the stator side is increased by adopting the two sets of windings, and the further development of the bearingless motor is limited. Compared with the traditional bearingless motor which uses two sets of windings, namely a torque winding and a suspension winding, the bearingless motor with the integrated winding structure has the advantages that the slotting is reduced, the stator structure can be more compact, and the motor structure is more miniaturized. However, the design theory of the electromagnetic structure of the integrated winding bearingless motor is not perfect at present and a certain theoretical support is lacked. Therefore, a method for determining the pole slots of the integrated winding bearingless permanent magnet motor is needed. Disclosure of Invention Based on the above, the embodiment of the invention provides a pole groove determining method and a pole groove determining system for an integrated winding bearingless permanent magnet motor, which realize the design of the integrated winding bearingless permanent magnet motor, thereby obtaining a miniaturized motor structure. In order to achieve the above object, the present invention provides the following solutions: a pole slot determining method of an integrated winding bearingless permanent magnet motor comprises the following steps: determining the number of unit motors of the bearingless permanent magnet motor to be designed relative to the torque winding based on the integrated winding levitation force generation principle; based on an alternating current winding theory, determining the number of grooves of the bearingless permanent magnet motor to be designed according to the number of pole pairs of the rotor of the bearingless permanent magnet motor to be designed and the number of unit motors; And obtaining the bearingless permanent magnet motor according to the pole pair number of the rotor and the groove number. Optionally, the determining the number of unit motors of the bearingless permanent magnet motor to be designed relative to the torque winding based on the integrated winding levitation force generation principle specifically includes: If the pole pair number of the rotor of the bearingless permanent magnet motor to be designed is p, the unit motor number of the bearingless permanent magnet motor to be designed relative to the torque winding is determined to be 2, wherein p=4n, n=3a±1, a=0, 1,2. Optionally, the determining the number of slots of the bearingless permanent magnet motor to be designed according to the pole pair number of the rotor of the bearingless permanent magnet motor to be designed and the number of the unit motors based on the alternating current winding theory specifically comprises: Determining a first calculation formula and a second calculation formula by adopting an alternating-current winding theory according to the pole pair number of the rotor and the unit motor number; wherein, the first calculation formula is: q is the number of slots of each pole and each phase, Z is the number of slots of the bearingless permanent magnet motor to be designed, and p is the pole pair number of the rotor; After about division into N 1 is a sub-divided numerator, D is a sub-divided denominator, D=1, N 1 =q when q represents an integer slot, D is not equal to 1 when q represents a fractional slot, and N 1 and D are not common divisor; the