Study on the Characteristics of Electromagnetic Noise of Axial Flux Permanent Magnet Synchronous Motor

Table 1

Main normal electromagnetic force.

Harmonic source	Item
	Amplitude	Frequency	Order
The interaction between rotor and stator harmonic	1/2𝜇0𝐵𝜈𝐵𝜇	2𝑘1𝑓1; 2(𝑘1+1)𝑓1	2𝑘1+1𝑝1±𝑘2𝑍1𝑡−𝜈𝑝; 2𝑘1+1𝑝1±𝑘2𝑍1𝑡+𝜈𝑝
The interaction of different rotor harmonic	1/2𝜇0𝐵𝜇1𝐵𝜇2	2(𝑘1−𝑘3)𝑓1; 2(𝑘1+𝑘3+1)𝑓1	2𝑘1−𝑘3𝑝1±𝑘2±𝑘4𝑍1𝑡; 2𝑘1+𝑘3+1𝑝1±𝑘2±𝑘4𝑍1𝑡

Remark: 𝑘₁, 𝑘₂, 𝑘₃, 𝑘₄ are defined as 0, 1, 2, 3,…, respectively  𝑓₁ is fundamental frequency; 𝜈_𝑝 is harmonic order produced by stator winding.