Motor soft start control system based on NB-IoT

Abstract

The invention discloses a motor soft start control system based on NB-IoT (narrowband Internet of Things). The motor soft start control system comprises the following steps: a user sends a click soft start instruction through a monitoring configuration client; the soft start instruction is uploaded to an Internet of Things platform, and the Internet of Things platform transmits a start instruction to a soft starter in a work site; and after the starting instruction is received, the soft starter controls the motor to start softly. By using the soft starter to start the three-phase asynchronous motor, the problem of overlarge impact current in hard start and the problem of single traditional start mode can be effectively avoided, and the impact on a power grid and the motor at the moment of motor start is effectively reduced.

Description

Technical Field

[0001] The present invention is applied to the field of motor control, and in particular relates to a motor soft start control system based on NB-IoT (Narrowband Internet of Things). Background Art

[0002] With the increasing demand for high-power motors in industrial production and the increasing requirements for stability and reliability during motor start-stop and operation, the shortcomings of traditional starting methods have gradually been exposed. That is, traditional direct starting has a large impact current. As a result, the current of the power grid will increase instantly and the voltage will decrease accordingly, thus affecting other running electrical equipment and possibly triggering low-voltage protection, thereby threatening the safe operation of related equipment, making the setting and coordination of the motor itself and the system's relay protection difficult, and reducing the protection sensitivity. Compared with direct starting, the traditional reduced voltage starting method can effectively eliminate the 3-8 times of impact current generated by the direct starting method, but at the same time, the torque of the motor when starting will also be reduced. Therefore, generally, the reduced voltage starting is used when the motor is unloaded or lightly loaded. Therefore, in this case, in order to ensure safety, reliability and economy, soft start mode and soft starter appeared. Soft starter is a motor control device that combines soft start, soft stop and multi-function protection. In the overall starting process, it can achieve impact-free and smooth starting of the motor. NB-loT has stronger and wider signal coverage, and can truly realize normal data transmission in remote areas such as suburbs. At the same time, NB-loT has ultra-low power consumption, and the normal communication and standby currents are at the mA and uA levels. When powered by AA batteries, the module's standby time can be up to ten years, during which time there is no need to replace the battery, reducing the workload of workers. Most of the soft starter products on the market today do not have the functions of detecting multiple faults of the motor (overload, overvoltage, short circuit, etc.), providing real-time feedback of the motor operation data to the operator, and having a monitoring configuration client that can remotely set the various start and stop parameters of the motor. Summary of the invention

[0003] To achieve the above object, the present invention is implemented through the following technical solutions:

[0004] A three-phase asynchronous motor soft start control system based on NB-IoT (narrowband Internet of Things), characterized in that the method comprises the following steps: Step 1: a user issues a click soft start command through a monitoring configuration client; Step 2: uploading the soft start command to an Internet of Things platform, and the Internet of Things platform transmits the start command to a soft starter at a work site; Step 3: after receiving the start command, the soft starter controls the motor to soft start.

[0005] As a further solution of the present invention, step 1 specifically includes the following contents: the user sets the motor start and stop parameters, i.e., the starting voltage and current, through the PC configuration interface, and selects the motor starting mode, i.e., the current limiting starting mode and the ramp voltage boost starting mode.

[0006] As a further solution of the present invention, step 2 specifically includes the following contents: NB-IoP (narrowband Internet of Things) communication equipment, Alibaba Cloud Internet of Things cloud server, and device ID of the soft starter.

[0007] As a further solution of the present invention, step 3 specifically includes the following contents: main controller, three-phase AC voltage regulation system, bypass contactor, electrical parameter detection system, mechanical parameter detection system. The function of the soft starter is to smoothly and steplessly increase the voltage to achieve the purpose of soft starting.

[0008] Compared with the prior art, the present invention has the following significant advantages: it solves the problem that the motor soft starter has a single working mode and cannot provide real-time feedback on the various operating states of the motor, and provides users with a variety of soft starting modes (current limiting starting mode, ramp boost starting mode) and a variety of control modes (remote control, local control, and simultaneous control of multiple machines). BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a flow chart of the motor soft start control system based on NB-IoT (Narrowband Internet of Things) of the present invention. DETAILED DESCRIPTION

[0010] The present invention will be further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0011] The present invention discloses a motor soft start control system based on NB-IoT (narrowband Internet of Things), step 1: a user sends a click soft start command through a monitoring configuration client; step 2: uploading the soft start command to an Internet of Things platform, and the Internet of Things platform transmits the start command to a soft starter at a work site; step 3: after receiving the start command, the soft starter controls the motor to soft start.

[0012] Each step is described in detail below.

[0013] Step 1: The user issues a click soft start command through the monitoring configuration client;

[0014] The monitoring configuration client of the present invention is a configuration interface displayed on the PC side. Its main function is to achieve human-computer interaction between the soft starter and the user. The monitoring configuration client allows the user to set various parameters for starting and stopping the motor and select the starting method of the motor, and transmits the parameter information set by the user to the Internet of Things platform, ultimately achieving the purpose of controlling the motor.

[0015] Step 2: Upload the soft start command to the IoT platform, and the IoT platform transmits the start command to the soft starter at the work site;

[0016] The communication method of the IoT platform adopts NB-loT (narrowband IoT) to replace the wireless communication methods such as WIFI or 3G / 4G commonly used in the market. The IoT platform, this product includes an IoT device end and an application end, as well as a data processing method and system that can realize the connection between the user's third-party server and the IoT cloud server. The user's third-party server will send the data information of the device end registered with the same IoT cloud server to the IoT cloud server to which the device end belongs; the IoT cloud server will send the received data information to the application end associated with the cloud server itself, and then integrate and process the received data, and finally send the control instructions back to the third-party server to realize the control of the IoT device end.

[0017] Step 3: After receiving the start command, the soft starter controls the motor to soft start;

[0018] The soft start and soft stop functions of the three-phase asynchronous motor soft starter are completed by a three-phase AC voltage regulation system, which consists of a three-phase AC voltage regulation circuit, a thyristor trigger circuit, and a zero-crossing detection circuit. The three-phase AC voltage regulation system will smoothly and steplessly increase the motor voltage under the control of the main controller to achieve the purpose of soft starting.

[0019] The above content is a further detailed description of the present invention in combination with specific preferred implementation modes. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A three-phase asynchronous motor soft start control system based on NB-IoT (Narrowband Internet of Things), characterized in that: The method comprises the following steps: Step 1: The user issues a click soft start command through the monitoring configuration client; Step 2: Upload the soft start command to the IoT platform, and the IoT platform transmits the start command to the soft starter at the work site; Step 3: After receiving the start command, the soft starter controls the motor to soft start.

2. According to a three-phase asynchronous motor soft start control system based on NB-IoT (Narrowband Internet of Things) according to claim 1, it is characterized in that: The monitoring configuration client includes: PC configuration interface, motor start / stop parameter setting interface (starting voltage and current limit), and motor starting mode setting interface (current limiting starting mode, ramp voltage boost starting mode).

3. According to a three-phase asynchronous motor soft start control system based on NB-IoT (Narrowband Internet of Things) according to claim 1, it is characterized in that: The Internet of Things platform includes: NB-IoP (Narrowband Internet of Things) communication equipment, Alibaba Cloud Internet of Things cloud server, and device ID of the soft starter.

4. A three-phase asynchronous motor soft start control system based on NB-IoT (Narrowband Internet of Things) according to claim 1, characterized in that: The soft starter mainly includes a main controller, a three-phase AC voltage regulation system, a bypass contactor, an electrical parameter detection system, and a mechanical parameter detection system. The function of the soft starter is to smoothly and steplessly increase the voltage to achieve the purpose of soft starting.

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