特点 Characteristic | 异步电机 Asynchronous motor | 永磁电机 Permanent magnet motor |
效率 Efficiency | 低 Low~High | 高 Super High |
功率因数 Power factor | 低，无功电流大，加大了电网负荷，有时需増加电补偿器。 Low PF, and with large inactive current. PF compensator capacitor could be needed. | 高，无转子感应电流，电网中不需安装补尝器 Highest PF, no need for PF compensator.
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控制特性 Control characteristics | 差 Poor | 好 Good |
体积 Volume | 大 Large | 小，正常缩小两个中心高，重量轻，约相当于同功率异步电机重量的60%。 Small, usually two frame sizes of reduction, light weight, equivalent to 60% of the weight of the asynchronous motor with same rating. |
启动性能 Start performance | 工频电直接启，起动电流大，对电网有冲击，不允许多次启停 Direct one line starting, large starting current, has impact to the electricity grid, and frequent starts are not allowed. | 变频，恒转矩启动，允许多次启停 Frequency drive, constant torque start, frequent starts are allowed.
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转子结构 Rotator structure | 简单，鼠笼 Simple, squirrel cage
| 复杂，内贴或表贴磁钢 Complex, in-slot or surface sticking of magnetic steel. |
总成本 Total cost | 初期投入少，后期用电多，总成本高 Low purchase cost but with large amount of electricity consumption in the later stage, high total cost.
| 初期投入贵，后期比异步省电，总成本低，运行200天可回差价。 Relative higher purchase cost however with lower total cost from the saving on electricity during operation. The return of price difference is about 100 operation days. |
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