How is the speed of gearless traction elevator drive mechanisms varied?

Understanding Motor Controls
4th Edition
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter43: Direct Drives And Pulley Drives
Section: Chapter Questions
Problem 3RQ: What three alignment checks should be made to ensure satisfactory and long service for directly...
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How is the speed of gearless traction elevator drive mechanisms varied?

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