产品技术标准
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. |
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. |
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. |
产品使用环境
举例说明（按0.5元/度计算，22KW永磁电机运行200天可节电1900元，相当于200天收回电机采购价差）
型号 Type | 功率 Power | 频率 Frequency | 电压 Voltage | 电流 Current | 效率% Efficiency | 功率因数PF | 以数量1台，连续运行200天节电（度） Saving on electricity for 1pc of 22kw PM motor during operation for 100 days (KWH) | ||||
恒转矩转速 Constant torque speed | 负荷 (%) Load (%) | ||||||||||
3000 | 2100 | 900 | 100 | 50 | 25 | ||||||
OMP22-160 | 22 | 100 | 370 | 38.3 | 94.4 | 94 | 90.3 | 0.95 | 0.95 | 0.95 | 1899 |
IE2-180M-2 | 22 | 50 | 380 | 41.1 | 91.3 | 89.5 | 79.4 | 0.89 | 0.89 | 0.89 | |
IE3-180M-2 | 22 | 50 | 380 | 40.5 | 92.7 | 91.2 | 83 | 0.89 | 0.89 | 0.89 | 873 |
以上纯属效率提升带来的节电效益，不包括变频降速带来的节能，以风机负载为例的变频节电详见下图
转速n% RPM (n%) | 风量(Q%) Fluid Load (Q%) | 频率 Frequency | 风压F% Wind pressure | 轴功率P% Shaft power (P%) |
100 | 100 | 50 | 100 | 100 |
90 | 90 | 45 | 81 | 72.9 |
80 | 80 | 40 | 64 | 51.2 |
70 | 70 | 35 | 49 | 34.3 |
60 | 60 | 30 | 36 | 21.6 |
50 | 50 | 25 | 25 | 12.5 |
显然，变频控制系统的节能效果是十分突出的，请见下图的比较曲线。
当风机效率一定，调节风量微小的变化时，转速可成比例下降，则风机的轴功率成立方关系下降。在满足工艺要求的前提下，若风机转速有富余10%，将可节省电耗27.1%，若风机的转速富余20%，将可节省电耗48.8%。由此可见，风机、水泵类负载，其节电效果将是非常明显。
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