- Frequency inverter
- general purpose frequency inverter low voltage 690V and lower
- special purpose frequency inverter low voltage 690V and lower
- four quadrants frequency inverter low voltage
- Servo drives low voltage
- medium voltage (1140V)
- high voltage (3.3KV/6.6KV/10KV)
- Accessories
- Option cards
- Solution
Address: No.4 Building, Gaofa Industrial Park, Longjing, Nanshan District, Shenzhen, 518055, China
ZipCode: 518055
Tel: +86-755-86312856 86318602 86318456 (direct line) Mobile: +86 133 169 613 20 /+86 135 100 656 90
Fax: +86-755-8602 8412
Email: wangjian@invt.com.cn
Company Profile Tel :+86 755 86312834 86028065 (direct line) Mobile: +86 136 326 868 69 Fax:+86 755 8602 8412 Tel :+86 755 86312845 86028065 (direct line) Mobile: +86 130 778 019 09 Fax:+86 755 8602 8412 Tel :+86-755-86312856 86318602 86318456 (direct line) Mobile: +86 133 169 613 20 /+86 135 100 656 90 Fax:+86-755-8602 8412
I. Principle for Energy Saving According to the theory of hydrodynamics, the relationship among motor shaft power (P), air quantity (Q), and pressure (H) is defined by the following formula: P=K*H*Q/η Where, K is a constant; η indicates efficiency. Their relationship with rotation speed N is as follows: Q1/Q2=N1/N2 Curve Based on hydrodynamics, air quantity Q is in direction proportion to the rotation speed, pressure H is in directional proportion to the square of the rotation speed, and shaft power P is in directional proportion to the cube of rotation speed. When the air quantity decreases and the rotation speed of fan drops, the shaft power decreases sharply. For example, when the air quantity drops to 80% and the rotation speed to 80%, the shaft power decreases to the 51% of the rated power. When air quantity drops to 50%, the power P drops to the 13% of the rated power. The power actually saved may not be so drastic due to the influence of actual working conditions, but the energy will be considerably saved. Therefore, in mechanical equipment with fans and pumps, the use of inverters to adjust air quantity and flow rate is the most effective way of energy saving. II. Working Principle With the application of the latest computer control technology, INVT energy saving controller uses pressure sensor signals and related electric control signals to keep the pressure at a desirable value according to the rotation speed of the motor of the pressure control pump for water supply pipelines, thus saving unnecessarily consumed energy and saving electricity. 2. Block diagram of basic working principle
H1/H2= (N1/N2)2
P1/P2= (N1/N2)3

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