High-torque low-speed permanent magnet synchronous motor hoisting load on-line detection system and detection method

Abstract

The invention relate to a high-torque low-speed permanent magnet synchronous motor hoisting load on-line detection method and a system. The system comprises a high-torque low-speed magnet synchronous motor, a control device, and a signal collecting device used for acquiring current signals of the motor. The signal collecting device relates to a current sensor used for collecting current inputting signals and/or a frequency converter capable of outputting current outputting signals. According to the online detection method, the current signals of the motor are acquired; the current signals are adopted as sensing signals of the hoisting load, or hoisting load data of the motor can be calculated according to the current signals; a current threshold when the hoisting load is overload is set; and when the collected current signals reach or exceed the set current threshold, the motor is stopped and/or an overload alarm is given. The detection method and the system are simple in structure, and convenient, rapid, accurate and reliable in signal detection, and are particularly suitable for load/hoisting load detection of the high-torque low-speed permanent magnet synchronous motor and a crane gearless hoisting mechanism based on the motor.

Description

technical field [0001] The present invention relates to a high-torque low-speed permanent magnet synchronous motor hoisting online detection system, and also relates to a high-torque low-speed permanent magnet synchronous motor hoisting online detection method using the detection system, which is suitable for permanent magnet synchronous motors, especially Low-speed high-torque external rotor permanent magnet synchronous motor and the load / hoisting detection of the gearless lifting mechanism of the crane based on this motor. Background technique [0002] The weighing of existing cranes generally detects the weight by installing a weight sensor on a stressed steel wire rope or a motor. The weight sensor in the prior art is usually a mechanical weight sensor, and the elastic deformation signal of the signal acquisition element is used as the transmission of the hoisting weight. Inductive signal, calculate or convert the elastic deformation of the signal acquisition element und...

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Problems solved by technology

[0002] The weighing of existing cranes generally detects the weight by installing a weight sensor on a stressed steel wire rope or a motor. The weight sensor in the prior art is usually a mechanical weight sensor, and the elastic deformation signal of the signal acquisition element is used as the transmission of the hoisting weight. Inductive signal, calculate or convert the elastic deformation of the signal acquisition element under the stress state into the weight of the hoisting weight. The weight sensor related to the crane usually has a large error and low accuracy, and a relatively better sensor is expensive. , Installation and maintenance are sometimes dangerous, so the weighing instrument in the crane industry is always unreliable, especially in the application process, the weighing instrument is often used for a long time, the sensor is installed loose or misplaced, etc., and the false alarm is overweight. As a result, it cannot work, and some users shield the weighing instrument, which brings safety hazards to production

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