(1) Technical scope of application

(1) Technical scope of application

This technology is mainly used for energy-saving technology in motors in various industries.

(2) Technical principles (transformation content)

① Technical introduction

The original DC traction motor in the company's production line was replaced with a variable frequency drive permanent magnet synchronous motor, and a supporting frequency converter was installed.

② Energy saving principles

Permanent magnet synchronous motors have the advantages of simple structure, small size, light weight, small loss, high efficiency, and high power factor. They are mainly used for high-performance servo drive systems and DC motors that require fast response, wide speed regulation range, and accurate positioning. Replacement motors. The cast film production line mainly consists of five parts: extrusion part, casting part, corona part, winding part, and electronic control part. The DC drive motor used before the project renovation has complex structure and requirements on the environment. The speed is determined by its own structure, power supply voltage and load weight. Therefore, it is not suitable for occasions with large load changes, causing electromagnetic interference and affecting production and working conditions. The variable frequency permanent magnet synchronous motor control system adopts a variable frequency system with a wide speed regulation range, high dynamic characteristics and efficiency, so as to meet the requirements of production conditions and save energy.

(3) Application cases

Shanghai Dahui Plastic Industry Co., Ltd. Motor power-saving renovation and energy-saving project.

1) Implementation content and cycle: Replace three DC traction motors in a casting film production line of the company with three variable-frequency drive permanent magnet synchronous motors (motor powers are: one set of 250kW and two sets of 75kW respectively); Install 1 set of 250kW and 2 sets of 75kW variable frequency inverters, and add control devices such as electronic component modules. The implementation cycle is 7 months.

2) Energy conservation and emission reduction effect and investment payback period: Project electricity saving =(product power consumption before project transformation-product power consumption after project transformation) × product output before project transformation =(0.483-0.226) ×4820123=123.88 (ten thousand kWh), equivalent to 357 tons of standard coal. After review, the statistical data of the company's total production output in 2017 before the project transformation was 12776123.2 kg, the annual power consumption was 7.0344 million kWh, and the product power consumption was 0.55 kWh/kg; after the project transformation, the statistical data of the company's total production output in 2019 was 21599534.49 kg, the annual power consumption was 5.3056 million kWh, and the product power consumption was 0.25 kWh/kg; The unit consumption of products within the boundaries of the plant and the annual electricity saving is (0.55-0.25) ×12776123.2=383.3 (ten thousand kWh), which is much greater than the project's electricity saving.

The payback period is 0.4 years.

(4) Potential for replication and promotion, energy-saving potential (payback period)

The technology is applied to all walks of life, used for energy-saving technical transformation, the technical transformation method is safe and reliable, can effectively improve the original defects of the existing motor, has greater energy-saving potential, obvious energy-saving emission reduction effect, broad application prospect and greater replication potential.