4results about How to "Achieving a soft start" patented technology

This utility model provides a mine-use explosion-proof and intrinsically safe low-voltage contactless switch circuit, including: a main circuit, a control circuit, a transformer TC, and a comprehensive controller JZK1; the main circuit includes a reversing switch QS, one side of which is used to connect to the incoming three-phase live wires X1, X2, and X3, and the other side is connected to the power supply three-phase live wires XA, XB, and XC respectively through fuses KR1, KR2, and KR3; the first terminals of bidirectional thyristors MTC1, MTC2, and MTC3 are respectively connected to the power supply three-phase live wires XA, XB, and XC. The second terminals of the bidirectional thyristors MTC1, MTC2, and MTC3 are connected to the three-phase power terminals of the three-phase motor M1 via three-phase lines; the first and second terminals of the bidirectional thyristors MTC1, MTC2, and MTC3 are connected to the corresponding voltage detection terminals of the integrated controller JZK1; and the gate terminals of the bidirectional thyristors MTC1, MTC2, and MTC3 are connected to the corresponding gate control terminals of the integrated controller JZK1. This circuit is safer and more reliable for long-term use, and also realizes the soft-start function of the motor.

This application relates to the field of motor control technology and discloses a motor control method and system. The motor control method includes: upon detecting an AC zero-crossing, determining the electrical angle increment of the motor relative to the previous AC zero-crossing; determining the electrical angle of the current AC zero-crossing based on the electrical angle of the previous AC zero-crossing and the electrical angle increment; determining the target phase path that needs to be turned on based on the comparison results of the electrical angle of the current AC zero-crossing with multiple conduction control intervals; and controlling the target phase path to be turned on at the current AC zero-crossing. This motor control method, through precise electrical angle tracking and zero-crossing synchronized phase-by-phase conduction control, can reduce the instantaneous current during motor startup, effectively limit current surges, alleviate transient stress on channel devices, lines, and the load body, and achieve soft starting of the motor.

The application discloses a metro pulse passenger flow-oriented escalator control method, equipment and medium, the method comprises the following steps: according to metro train operation data, construct the pulse passenger flow trigger sequence based on discrete events, calculate the continuous passenger flow injection curve arriving at the entrance of the escalator;The future dynamic load torque of the escalator is predicted by using PINN network;In combination with the predicted dynamic load torque, the minimum system operation energy consumption, mechanical wear and queuing congestion penalty are taken as the comprehensive target, the multi-objective nonlinear model predictive control optimization problem is constructed and solved, the optimal speed control instruction is generated and issued to the escalator frequency converter for execution.The application can accurately reconstruct the real-time quality distribution on the escalator, and calculate the future dynamic load torque accordingly, and the controller adjusts the motor operation accordingly, so that it always works at the optimal slip frequency point, reduces the energy consumption of the escalator, reduces the wear of parts, prolongs the service life.

This application relates to the field of traditional Chinese medicine massage devices, and discloses a traditional Chinese medicine pediatric massage device, including a massage bed and a moving mechanism for moving the massage structure along the XYZ axes. A switching mechanism for switching different massage modes is installed on one side of the moving mechanism. The switching mechanism includes a geared motor, and the output shaft of the geared motor is connected to a drive gear via a coupling. By selectively energizing an electromagnet in any magnetic coupling structure through a control unit, the friction connection at the bottom of that structure gains power, while the other two mechanisms remain in a free-running, separated state. This structural design allows the same device to freely switch between three completely different traditional Chinese medicine massage techniques—reciprocating acupressure, rotary kneading, and linear reciprocating rubbing—as needed for massage therapy. Compared to existing single rolling massage techniques, this device integrates multiple massage techniques, possessing comprehensive therapeutic capabilities and significantly improving the targeting and clinical efficacy of massage therapy.