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机特性的影响，相应调整电机尺寸和绕组结构得到最佳电机设计方案。本设计要求的额定功率为7.5KW，额定转速为1500r∕min，极对数2，频率50Hz，效率94%。
5.2电机的电磁仿真及设计优化
5.2.1采用RMxprt进行路的方法计算
1.建立项目
启动Maxwell Control Panel 进入Maxwell控制板建立所设计电机项目，本设计项目名为YCTF，如图5.1所示。
图5.1建立项目
2.输入数据
1）输入基本数据
功率7.5Kw、功率因数0.9、电压400V、极数4、频率50Hz、摩擦损耗70W、工作温度75oC、连接方式Y 以及仿真类型。
图5.2 基本数据的输入
2）输入定子铁心数据
定子外径220mm、内径146mm、槽数36、斜槽数1以及槽型尺寸。
图5.3定子铁心数据的输入
3）输入定子绕组数据
铁心长度170mm、叠压系数0.93、定子冲片型号M19-24G、并联支路数1、每槽导体数32、节距8以及绕组形式。
图5.4定子绕组数据输入
4）输入转子数据
气隙长度2mm、转子内径40mm、转子铁心长175、转子冲片叠压系数0.93、冲片型号M19-24G、永磁体牌号N35H、永磁体尺寸以及转子结构类型。
图 5.5转子数据的输入
3通过Rmxprt窗口中Run∕Analytical Design操作运行所输入的参数，输出数据、图形和曲线如下： （1）输出数据：
PERMANENT MAGNET SYNCHRONOUS GENERATOR DESIGN
File: d:/仿真软件/maxwell/default/yctf.pjt/yctf.res GENERAL DATA
Rated Output Power (kW): 7.5 Rated Power Factor: 0.9 Rated Voltage (V): 400 Number of Poles: 4 Frequency (Hz): 50
Friction and Wind Loss (W): 70 Rotor Position: Inner
Operating Temperature (C): 75 Type of Circuit: S3
Operation Type: Individual Machine Domain: Frequency STATOR DATA
Number of Stator Slots: 36
Outer Diameter of Stator (mm): 220 Inner Diameter of Stator (mm): 146 Type of Stator Slot: 2 Dimension of Stator Slot hs0 (mm): 1 hs1 (mm): 1.3 hs2 (mm): 8 bs0 (mm): 4 bs1 (mm): 7.2 bs2 (mm): 8.6 Top Tooth Width (mm): 5.94233 Bottom Tooth Width (mm): 5.93859 Skew Width (Number of Slots): 1 Length of Stator Core (mm): 174 Stacking Factor of Stator Core: 0.93 Type of Steel: M19-24G
Slot Insulation Thickness (mm): 0.3 End Length Adjustment (mm): 0 Number of Parallel Branches: 1 Number of Conductors per Slot: 32 Type of Coils: 22 Average Coil Pitch: 8
Number of Wires per Conductor: 2 Wire Diameter (mm): 0.85 Wire Wrap Thickness (mm): 0.09
Stator Slot Fill Factor (%): 71.9001 Coil Half-Turn Length (mm): 338.724 ROTOR DATA
Minimum Air Gap (mm): 2 Inner Diameter (mm): 40 Length of Rotor (mm): 175
Stacking Factor of Iron Core: 0.93 Type of Steel: M19-24G Shaft Diameter (mm): 33
Mechanical Pole Embrace: 0.820072 Electrical Pole Embrace: 0.863649 Max. Thickness of Magnet (mm): 20 Width of Magnet (mm): 45 Type of Magnet: n35h Type of Rotor: 4
PERMANENT MAGNET DATA
Residual Flux Density (Tesla): 1.22 Coercive Force (kA/m): 923
Maximum Energy Density (kJ/m^3): 282 Relative Recoil Permeability: 1.049
Demagnetized Flux Density (Tesla): 0.457872 Recoil Residual Flux Density (Tesla): 1.21891 Recoil Coercive Force (kA/m): 924.696 MATERIAL CONSUMPTION
Armature Copper Density (kg/m^3): 8900 Permanent Magnet Density (kg/m^3): 7800 Armature Core Steel Density (kg/m^3): 7650 Rotor Core Steel Density (kg/m^3): 7650 Armature Copper Weight (kg): 3.94136 Permanent Magnet Weight (kg): 4.914
Armature Core Steel Weight (kg): 21.7192 Rotor Core Steel Weight (kg): 13.0731 Total Net Weight (kg): 43.6476
Armature Core Steel Consumption (kg): 41.1189 Rotor Core Steel Consumption (kg): 20.5593 STEADY STATE PARAMETERS Stator Winding Factor: 0.818579
D-Axis Reactive Reactance Xad (ohm): 1.61566 Q-Axis Reactive Reactance Xaq (ohm): 6.36334 D-Axis Reactance X1+Xad (ohm): 2.92832 Q-Axis Reactance X1+Xaq (ohm): 7.676
Armature Leakage Reactance X1 (ohm): 1.31266 Zero-Sequence Reactance X0 (ohm): 0.697265 Armature Phase Resistance R1 (ohm): 2.48702 NO-LOAD MAGNETIC DATA
Stator-Teeth Flux Density (Tesla): 1.95904