Tangential four-layer winding fractional slot permanent magnet motor flux density distribution calculation method

Abstract

The invention discloses a tangential four-layer winding fractional slot permanent magnet motor flux density distribution calculation method. The method comprises the following steps: performing equivalence on each magnetic isolation bridge of a permanent magnet motor by using a rectangular equivalent air gap; estimating the saturation degree of the iron core at the magnetic isolation bridge; calculating an equivalent air gap length initial value; dividing a motor region into five types of sub-domains; establishing a vector magnetic potential equation in each sub-domain and a boundary condition on an interface; obtaining a flux density expression of the permanent magnet motor and an error of relative permeability by solving an unknown coefficient in the vector magnetic potential equation; and the relative permeability of the iron core at the magnetic isolation bridge is updated for iterative calculation until the error value of the obtained relative permeability is smaller than a limit value, so that the final flux density result of the permanent magnet motor is obtained. According to the method, the flux density of the permanent magnet motor under the consideration of iron core saturation can be accurately calculated, and an efficient and accurate research method is provided for magnetic field calculation and performance analysis of the tangential four-layer winding fractional slot permanent magnet motor.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and in particular relates to a method for calculating magnetic density distribution of a tangential four-layer winding fractional slot permanent magnet motor. Background technique [0002] Electromagnetic field calculation is one of the important steps in motor design, and it is also the basis and premise of calculating and analyzing motor performance. The commonly used calculation methods mainly include equivalent magnetic circuit method, finite element method and analytical method. Among them, the analytical method can obtain the intuitive relationship expression between the performance of the motor and the design parameters by solving the Laplace / Poisson equation of the magnetic potential in the motor, which is a fast and effective method for calculating the electromagnetic field. It has unique advantages in optimization design and parameter analysis. However, the premise of a...

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Problems solved by technology

However, the rotor structure of the motor with this structure is complex, mathematical modeling is more difficult, and there are magnetic flux leakage and iron core saturation at the rotor magnetic isolation bridge. If the iron core saturation cannot be considered, it will lead to large errors in subsequent magnetic field calculations.

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