This frequency range is proximate to main vibration frequency of the traction machine at rated speed, and, according to this, measures against elevator resonance are proposed.
并针对该频率区与曳引机主机额定转速———主振频率接近的特点，提出了防止电梯发生系统共振的措施。
Because of good performance and space saving, gearless permanent magnet synchronous traction machine is more and more widely used to drive the elevator.
由于无齿轮永磁同步曳引机具有性能优越、占用空间小的特点，在电梯驱动系统中的应用日趋广泛。
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