Weighing-sensor-free starting torque control method of elevator permanent magnet dragging system

A weighing sensor and traction system technology, which is applied in the field of motor and elevator traction control, can solve the problems of reduced reliability and increased cost of the elevator system

Active Publication Date: 2015-02-25
哈尔滨工大正元信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of using a load cell to obtain elevator load weight information to maintain the operation of the elevator system under the condition that the elevator permanent magnet traction system only uses the position information of the ordinary resolution incremental encoder as the feedback of the control system. The balance before the elevator system will cause the problem of lower reliability and higher cost of the elevator system. A method for controlling the starting torque of the elevator permanent magnet traction system without a weighing sensor is provided.

Method used

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  • Weighing-sensor-free starting torque control method of elevator permanent magnet dragging system
  • Weighing-sensor-free starting torque control method of elevator permanent magnet dragging system
  • Weighing-sensor-free starting torque control method of elevator permanent magnet dragging system

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specific Embodiment approach 1

[0084] Specific implementation mode one: the following combination figure 1 and figure 2 This embodiment will be described. The elevator permanent magnet traction system described in this embodiment does not have a weighing sensor starting torque control method. The permanent magnet traction system uses a permanent magnet synchronous motor as the traction machine. The permanent magnet synchronous motor adopts a Quantitative photoelectric encoder is used as position sensor, it is characterized in that, it comprises the following steps:

[0085] Step 1: During the operation of the permanent magnet synchronous motor, the microprocessor is used to collect the position signal A and the position signal B output by the incremental photoelectric encoder. The position signal A and the position signal B are two orthogonal signals. The two-way quadrature signal is used for hysteresis comparison to obtain the incremental count value CNT, and then calculated according to the incremental ...

specific Embodiment approach 2

[0089] Specific implementation mode 2: This implementation mode further explains the implementation mode 1. The method for obtaining the current permanent magnet synchronous motor rotor position value θ in step 1 is:

[0090] θ=2π·CNT / M; (1)

[0091] Among them, M is the number of quadrature signal pulses output by the incremental photoelectric encoder for one revolution.

specific Embodiment approach 3

[0092] Specific implementation mode three: this implementation mode further explains the second implementation mode, setting the current as the kth sampling period, then the current motor backsliding distance θ in step two s The method of obtaining is:

[0093] θ s = θ k -θ 1 ,

[0094] where θ k is the rotor position value of the permanent magnet synchronous motor calculated according to the signal sampled by the incremental photoelectric encoder at the kth sampling period; θ 1 is the rotor position value of the permanent magnet synchronous motor calculated according to the signal sampled by the incremental photoelectric encoder in the first sampling period; where k≥1;

[0095] In the kth sampling period, the method to obtain the current motor angular velocity ω is:

[0096] ω = θ k - θ k - ...

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Abstract

The invention relates to a weighing-sensor-free starting torque control method of an elevator permanent magnet dragging system, and belongs to the technical field of motor and elevator dragging control. According to the starting torque control method, the problems that under the condition that only position information of a common resolution ratio incremental encoder is used in the elevator permanent magnet dragging system to serve as control system feedbacks, the method of obtaining elevator load weight information through a weight sensor is adopted for maintaining balance before the elevator system operates, the reliability of the elevator system is accordingly reduced, and the cost of the elevator system is accordingly increased are solved. The starting torque control method includes the steps of firstly obtaining a current permanent magnet synchronous motor rotor position value theta through calculation; obtaining the current motor inversed slipping distance deltas and the current motor angular speed omega through calculation; controlling the starting torque of a permanent magnet synchronous motor according to the current motor inversed slipping distance deltas and the current motor angular speed omega to restrain inversed slipping of the permanent magnet synchronous motor in the zero servo period. The weighing-sensor-free starting torque control method is used for the elevator permanent magnet dragging system.

Description

technical field [0001] The invention relates to a load cell-less starting torque control method for an elevator permanent magnet traction system, and belongs to the technical field of motor and elevator traction control. Background technique [0002] The direct drive permanent magnet traction system is being widely used in the field of elevators due to its advantages of machine room-less and high efficiency. For the direct-drive permanent magnet traction system, under the condition of low-resolution incremental encoder, how to improve the ride comfort of the elevator during the transition from parking mode to running mode is one of the key issues. When the elevator switches from parking mode to running mode, that is, during the release process of the electromagnetic brake, the backsliding distance and mechanical vibration must be considered comprehensively to ensure the comfort of the elevator. When the elevator is running, the traction machine drives the car and the counte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66B1/06B66B11/04H02P21/00
CPCB66B11/043
Inventor 王高林徐进王博文齐江博孙佳伟徐殿国
Owner 哈尔滨工大正元信息技术有限公司
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