Research on low-speed gearless permanent magnet synchronous motor for elevator drive

Abstract

Some key problems in designing low-speed gearless permanent magnet synchronous motor (PMSM) is discussed in this paper. Firstly, measures to reduce harmonic torque are proposed. Secondly, magnetic circuit structure of PMSM is surveyed to make corresponding selection. At last, finite element analysis of a low-speed gearless PMSM for elevator drive is proposed. A real PMSM product verified the design.

Machine current signature analysis as a way for fault detection in permanent magnet motors in elevators

“…The diagnosis of bearing damage via machine current signature analysis requires to know some bearing design parameters and the rotor speed as shown in equations from (3) to (5). In this case the fault is an inner race defect.…”

“…The stator voltages were measured using a Voltage Differential Probe, the rotor speed was measured using a shaft incremental encoder with 50 Jis of response time and the load fb = ~~fnft[I-(;~ cosp J] (3) was measured with an Energy Analyzer on all three phases.…”

“…The lowspeed gearless permanent magnet synchronous motor (PMSM) is an important topic in techniques for modem elevator drive in recent years [2], [3]. Many elevators with squirrel cage induction motors can now use permanent magnet motors with improved project costs and application performance.…”

Multilayer-Winding Versus Switched-Flux Permanent-Magnet AC Machines for Gearless Applications in Clean-Energy Systems

“…Gearless drives have been also proposed for a variety of other applications, such as elevators, trams, draglines, and ball mills [7]- [10]. Lack of a gear improves efficiency and robustness of a system and reduces its cost, bulk, and weight.…”

Design and construction of a laboratory bench system for the teaching and training of engineers on diagnostics of permanent magnet motors

“…So direct drive systems based on PMSM are a reality in many applications, such as wind power generation [1], lifts [2], electric train traction systems [3], ship propulsion [4], electric traction vehicles [5] or household appliances [6] The use of rare earth PMSM has some technological and economic drawbacks. From the technological point of view the temperature in the motor cannot be high because the permanent magnets are very sensitive to temperature, with low values of Curie Temp.…”