Electrical Co., Ltd. Suzhou Sigma
No. 588 Riverside Road, Suzhou New District: Address
Tel :0512 -8,187,019,868,081,876
Fax 0512 -68,081,876
Mobile: 13770660888 (Nanjing)



Sigma electromechanical history for everyone to bring a permanent magnet synchronous motor development

Date:2014/2/10 10:41:04 Hits:2166
  Early people using DC motor speed control system, the drawback is the low efficiency, maintenance difficulties. 70s inverter technology developed asynchronous motor inverter drive rapidly replacing the elevator industry in DC drive system. And this past decade in the elevator industry is increasingly using the latest drive technology of permanent magnet synchronous motor drive system, its small size, energy saving, good control performance, and easy to make low-speed direct drive, eliminating gear reduction; their low noise, flat layer precision and comfort are better than the previous drive system is also suitable for use in machine room less elevators.
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