Choose power frequency or frequency conversion motor for food processing air compressor
The demand for compressed air in the food processing industry is concentrated in blowing and filling, pneumatic transmission, packaging and sealing, etc. According to compressed air purity rating standards ISO 8573-1:2010The oil content of food-grade compressed air must be <0.01ppm, and the dew point should be controlled between 2℃ and 10℃ (PDP). The choice of motor type directly affects energy consumption efficiency and process stability-power frequency motors run at a fixed speed, and variable frequency motors match load demand by intelligently adjusting the speed. The difference between the two can be seen in the middle-aged energy consumption gap in continuously produced food factories. Up to 30%-50%.
Why food processing requires scientific selection of motor types
1. energy efficiency optimization
The energy efficiency of inverter motors is 15%-25% higher than that of power frequency motors under 50%-80% load conditions, and complies with the ISO 50001 energy management system standard.
2. pressure control
Frequency conversion technology controls pressure fluctuations to ±0.02MPa (power frequency equipment is ±0.05MPa) to avoid the decrease in filling accuracy of the bottle blowing machine due to unstable pressure.
3. equipment life
The soft start function reduces bearing wear rate by 60%, extending equipment life to 12-15 years.
4. compliance requirements
The frequency conversion system that has passed the EU CE certification can meet the requirements of the BRCGS food safety standard for energy consumption traceability. Shanghai Granklin Group’s variable frequency air compressor adopts oil-free compression technology that meets international standards, passes German Tüv “0” oil-free certification, and adapts to HACCP system requirements.
Comparison of core parameters of power frequency and frequency conversion motors
according to ISO 8573-1:2010 Class 1 In line with food production standards, the following parameters need to be verified:
1. load adaptability
- Inverter motor: Efficiency ≥94% in the 30%-100% load range (IE4 standard)
- Power frequency motors: Efficiency drops to 82% at <70% load
2. average annual energy consumption
Taking the 55kW unit as an example, the annual power consumption of inverter motors is 280,000 kWh, and the annual power frequency motors reaches 370,000 kWh (the difference exceeds 90,000 kWh).
3. Pressure band control
Frequency conversion technology narrows the pressure bandwidth to 0.1MPa and reduces gas waste by 10%-15%.
4. harmonic interference
Frequency conversion equipment equipped with AFE active filter has a total harmonic distortion (THD) of less than 3%, complying with IEC61000 -3-12 standard.
Potential risks of improper selection
1. Excessive energy consumption
When power frequency motors are operating under low load in the off-season, the annual electricity bill loses more than 500,000 yuan.
2. equipment loss
Frequent loading and unloading results in the number of starts and stops of power frequency motors ≥20 times per hour, and the life of contactors is shortened to 1-2 years.
3. process contamination
Pressure fluctuations cause filter breakdown, and oil content exceeding 0.01ppm triggers an FDA audit warning.
4. Carbon tax costs
The carbon emissions per unit production capacity of power frequency equipment are 18%-22% higher than that of frequency conversion models, and the annual carbon tax increase is 300,000 yuan.
by comparing ISO 50001 Energy Efficiency Baseline(Power frequency 2.5kW/m³ vs frequency conversion 1.8kW/m³), which can clarify the necessity of technical iteration.
Economic benefits of inverter motors
1. Direct energy conservation
Permanent magnet synchronous frequency conversion technology saves annual electricity bills by more than 1.2 million yuan (160kW unit).
2. maintenance costs
Reduce mechanical impact by 90%, and reduce annual maintenance costs from 150,000 yuan to 50,000 yuan.
3. capacity improvement
Pressure stability increases filling efficiency by 3%-5%, and the annual increase in production benefits exceeds 8 million yuan.
4. renewable energy subsidies
Comply with ISO 14064 carbon footprint certification and receive 5%-8% clean production subsidies from local governments.
Comparison of power frequency motors versus variable frequency motors in food processing
| parameters | Variable frequency motor air compressor | Power frequency motor air compressor |
|---|---|---|
| pressure control precision | ±0.02MPa (PID closed loop control) | ±0.05MPa (mechanical adjustment) |
| Power consumption per unit of gas | 0.10-0.15 Yuan/m³ | 0.18-0.25 Yuan/m³ |
| starts and stops | ≤2 times/hour (soft start) | ≥20 times/hour (hard start) |
| Average annual maintenance cost | 30,000 – 50,000 yuan (no contact loss) | 100,000 – 150,000 yuan (including component replacement) |
| equipment life | 12-15 Year (low stress operation) | 8-10 Years (cumulative mechanical fatigue) |
| compliance certification | CE/ISO 50001/Tüv certification | Only meets basic security certification |
summary
Food processing companies choosing inverter motor air compressors is a strategic decision to balance energy efficiency, cost and compliance. by following ISO 8573-1:2010 standards and IE4 Energy Efficiency Rating Requirements that frequency conversion technology can reduce comprehensive operating costs by more than 30%. Leading manufacturers such as Shanghai Granklin Group focus on permanent magnet frequency conversion technology and provide global food companies with compliance with permanent magnet frequency conversion technology. BRCGS with HACCP Intelligent compressed air solutions for the system.