A method for detecting spindle motor speed using Hall current addition algorithm

Abstract

The present invention discloses a method for detecting the speed of a spindle motor by using a Hall current plus algorithm, comprising the following steps: S1: a system for detecting the speed of a spindle motor by using a Hall current plus algorithm comprises a 4-way Hall open type current transformer, an analog signal processing unit, a central control unit, a LORA transmission unit, an RS485 transmission unit and a 4G transmission unit, wherein the central control unit and the 4-way Hall open type current transformer are all electrically connected to the analog signal processing unit, and the LORA transmission unit, the RS485 transmission unit and the 4G transmission unit are all electrically connected to the central control unit. The present invention directly measures the speed by utilizing a 4-way Hall open type current transformer to detect and cooperate with an edge computing algorithm. The algorithm is simple, and there is no need to install a speed sensor on the motor spindle. The system is easy to install and use, reduces investment costs, avoids complex installation and inaccurate measurement at low speeds, improves measurement accuracy, and ensures safety and real-time reliability.

Description

Technical Field

[0001] This invention relates to the field of spindle motor speed detection technology, and in particular to a method for detecting spindle motor speed using a Hall current plus algorithm. Background Art

[0002] In the measurement of spindle speed in warp knitting machines and lace machines in the textile industry, and in response to the digital transformation of the textile industry, the current method for measuring the spindle speed of warp knitting machines and lace machines mainly involves installing proximity switches or rotary encoders. This requires the installation of sensors and other supporting devices on the spindle, which is difficult and costly to implement on-site. Therefore, we propose a Hall current plus algorithm method for detecting spindle motor speed to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a Hall current plus algorithm method for detecting spindle motor speed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for detecting spindle motor speed using a Hall current addition algorithm includes the following steps:

[0006] S1: The Hall current plus algorithm detection system for spindle motor speed includes four Hall open-type current transformers, an analog signal processing unit, a central control unit, a LoRa transmission unit, an RS485 transmission unit, and a 4G transmission unit. The central control unit and the four Hall open-type current transformers are electrically connected to the analog signal processing unit, and the LoRa, RS485, and 4G transmission units are all electrically connected to the central control unit. The central control unit includes a high-precision comparator and is an MCU with edge computing capabilities. The analog signal processing unit is an analog signal processing module.

[0007] S2: Connect the 4-channel Hall effect open-type current transformer to the inverter power supply output cable of the spindle motor to collect the power supply current of the spindle motor;

[0008] S3: The inverter outputs a current signal ADC during power supply through the analog signal processing unit and transmits it to the central control unit. The central control unit filters out noise from the current waveform and adjusts the waveform to form an alternating current waveform.

[0009] S4: Utilize the high-precision comparator of the central control unit to acquire the Vout signal output from the 4-channel Hall open-type current transformer at the moment of no current, and use it as the base point of the signal.

[0010] S5: Based on the different base points of different 4-channel Hall open-type current transformer products, and based on the signal base point obtained in S3, the reference voltage is output using the DAC function of the central control unit, compared with the actual Vout, and the time interval between acquisition and output is compared to obtain the time of the AC signal zero crossing. The frequency of the AC current is calculated through hardware and software filtering algorithms.

[0011] S6: Using edge computing of the central control unit, the current frequency of the AC power in S4 is calculated and converted into motor speed;

[0012] S7: Through the ROLA transmission unit, the wireless communication module function of the ROLA transmission unit itself is used to realize the wireless self-organizing network function between multiple devices, and realize the functions of remote data transmission and parameter revision.

[0013] S8: Through the RS485 transmission unit, it can act as a MODBUS RTU slave station, providing data networking and parameter correction functions to the outside world.

[0014] Preferably, in S1, the 4-channel Hall open-type current transformer is a Hall current sensor based on the magnetic balance Hall principle.

[0015] Preferably, in S5, the DAC function of the central control unit outputs a reference voltage of 2.5V.

[0016] Compared with existing technologies, the beneficial effects of this invention are:

[0017] This invention utilizes a 4-channel Hall effect open-type current transformer detection combined with an edge computing algorithm to directly measure rotational speed. The algorithm is simple, eliminating the need for speed sensors on the motor shaft, making installation and use convenient, reducing investment costs, avoiding complex installation and inaccurate measurements at low speeds, improving measurement accuracy, and ensuring safety, real-time reliability. Attached Figure Description

[0018] Figure 1 This is a block diagram of a method for detecting spindle motor speed using a Hall current addition algorithm proposed in this invention. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figure 1 A method for detecting spindle motor speed using a Hall current plus algorithm includes the following steps:

[0021] S1: The Hall current plus algorithm detection system for spindle motor speed includes four Hall open-type current transformers, an analog signal processing unit, a central control unit, a LoRa transmission unit, an RS485 transmission unit, and a 4G transmission unit. The central control unit and the four Hall open-type current transformers are electrically connected to the analog signal processing unit, and the LoRa, RS485, and 4G transmission units are all electrically connected to the central control unit. The central control unit includes a high-precision comparator and is an MCU with edge computing capabilities. The analog signal processing unit is an analog signal processing module, wherein the four Hall open-type current transformers are Hall current sensors based on the magnetic balance Hall principle.

[0022] S2: Connect the 4-channel Hall effect open-type current transformer to the inverter power supply output cable of the spindle motor to collect the power supply current of the spindle motor;

[0023] S3: The inverter outputs a current signal ADC during power supply through the analog signal processing unit and transmits it to the central control unit. The central control unit filters out noise from the current waveform and adjusts the waveform to form an alternating current waveform.

[0024] S4: Utilize the high-precision comparator of the central control unit to acquire the Vout signal output from the 4-channel Hall open-type current transformer at the moment of no current, and use it as the base point of the signal.

[0025] S5: Based on the different base points of different 4-channel Hall open-type current transformer products, and based on the signal base point obtained in S3, the reference voltage is output using the DAC function of the central control unit. The reference voltage output by the DAC function of the central control unit is 2.5V. It is compared with the actual Vout. The time interval between acquisition and output is compared to obtain the time of the AC signal zero crossing. The frequency of the AC current is calculated through hardware and software filtering algorithms.

[0026] S6: Using edge computing of the central control unit, the current frequency of the AC power in S4 is calculated and converted into motor speed;

[0027] S7: Through the ROLA transmission unit, the wireless communication module function of the ROLA transmission unit itself is used to realize the wireless self-organizing network function between multiple devices, and realize the functions of remote data transmission and parameter revision.

[0028] S8: Through the RS485 transmission unit, it can act as a MODBUS RTU slave station, providing data networking and parameter correction functions to the outside world.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for detecting spindle motor speed using a Hall current addition algorithm, characterized in that, Includes the following steps: S1: The Hall current plus algorithm detection system for spindle motor speed includes 4 Hall open-type current transformers, an analog signal processing unit, a central control unit, a LoRa transmission unit, an RS485 transmission unit, and a 4G transmission unit. The central control unit and the 4 Hall open-type current transformers are electrically connected to the analog signal processing unit. The LoRa transmission unit, RS485 transmission unit, and 4G transmission unit are all electrically connected to the central control unit. The central control unit includes a high-precision comparator and is an MCU with edge computing capabilities. The analog signal processing unit is a signal analog quantity processing module. S2: Connect the 4-channel Hall effect open-type current transformer to the inverter power supply output cable of the spindle motor to collect the power supply current of the spindle motor; S3: The inverter outputs a current signal ADC during power supply through the analog signal processing unit and transmits it to the central control unit. The central control unit filters out noise from the current waveform and adjusts the waveform to form an alternating current waveform. S4: Utilizing the high-precision comparator of the central control unit, the Vout signal output from the four Hall-effect open-type current transformers is acquired at the moment of no current, serving as the base point of the signal. S5: Based on the different base points of different 4-channel Hall open-type current transformer products, and based on the signal base point obtained in S3, the reference voltage is output using the DAC function of the central control unit, compared with the actual Vout, and the time interval between acquisition and output is compared to obtain the time of the AC signal zero crossing. The frequency of the AC current is calculated through hardware and software filtering algorithms. S6: Using edge computing of the central control unit, the current frequency of the AC power in S4 is calculated and converted into motor speed; S7: Through the ROLA transmission unit, the wireless communication module function of the ROLA transmission unit itself is used to realize the wireless self-organizing network function between multiple devices, and realize the functions of remote data transmission and parameter revision. S8: Through the RS485 transmission unit, it can act as a MODBUS RTU slave station, providing data networking and parameter correction functions to the outside world.

2. The method for detecting spindle motor speed using a Hall current addition algorithm according to claim 1, characterized in that, In S1, the 4-channel Hall open-type current transformer is a Hall current sensor based on the magnetic balance Hall principle.

3. The method for detecting spindle motor speed using a Hall current addition algorithm according to claim 1, characterized in that, In S5, the DAC function of the central control unit outputs a reference voltage of 2.5V.

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