Welcome to PF!Vardges said:Hi there. I have an idea which is interesting. Let's suppose, we have AC generator which has capability of 100 KW and 100 RPM. And we have hydraulic motor which produces 500 RPM and 2400 Nm torque. Additionally, I attach 5:1 gearbox for reducing 500 RPM to 100 RPM for Ac generator. Please, share your thoughts, is it possible to produce high efficiency and electric energy with this combination?
125kW input for 100 kW output is not generally considered high efficiency. In practice it would be even less than that.Vardges said:Hi there. I have an idea which is interesting. Let's suppose, we have AC generator which has capability of 100 KW and 100 RPM. And we have hydraulic motor which produces 500 RPM and 2400 Nm torque. Additionally, I attach 5:1 gearbox for reducing 500 RPM to 100 RPM for Ac generator. Please, share your thoughts, is it possible to produce high efficiency and electric energy with this combination?
The hydraulic motor is spun by hydraulic pump. And the hydraulic pump is powered by electric motor.russ_watters said:Welcome to PF!
Depends -- what is making the hydraulic motor spin? And what do you consider "high efficiency"?
Dale said:125kW input for 100 kW output is not generally considered high efficiency. In practice it would be even less than that.
Power density is not relevant to the question of efficiency. For efficiency all that is considered is the input power and the output power. It doesn't matter how dense the power is, just how much goes in and how much comes out.Vardges said:Hydraulic motors have 10 times more power density than electric motors have.
Sure. That is what a hydroelectric power plant does. As @mfb and I have said, the efficiency of such a conversion is strictly less than 1.Vardges said:I want to use hydraulic mechanism to get electric power
Dale said:Power density is not relevant to the question of efficiency. For efficiency all that is considered is the input power and the output power. It doesn't matter how dense the power is, just how much goes in and how much comes out.
Based on your numbers above at least 125 kW hydraulic power goes in and at most 100 kW of electric power comes out. That is not a very high efficiency, but might be acceptable in some scenarios (e.g. If the hydraulic power were very inexpensive so you could sell the smaller amount of electrical power for more)
Sure. That is what a hydroelectric power plant does. As @mfb and I have said, the efficiency of such a conversion is strictly less than 1.
Perperual motion machines do not work and are not discussed on PF. Thread closedVardges said:typical hydraulic press consumes 5-7 KW electricity ... couple them to 100 KW PM generator.
A hydraulic motor-AC generator coupling works by using hydraulic power to rotate a motor, which in turn rotates an AC generator to produce electricity. The hydraulic fluid is pressurized and flows through the motor, causing it to rotate and drive the generator. This process allows for the conversion of hydraulic power into electrical energy.
One of the main advantages of a hydraulic motor-AC generator coupling is its efficiency. Since it utilizes hydraulic power to drive the motor, it can be more efficient than traditional mechanical systems. It also allows for precise control over the speed and power output, making it ideal for applications where variable speeds are necessary. Additionally, it can operate in a wide range of environments, including high temperatures and harsh conditions.
A hydraulic motor-AC generator coupling is commonly used in industrial and commercial settings, such as in power plants, manufacturing facilities, and construction sites. It can also be found in various types of machinery, including cranes, excavators, and pumps. It is also used in renewable energy systems, such as hydroelectric power plants, to convert the energy of moving water into electricity.
Like any other mechanical system, a hydraulic motor-AC generator coupling requires regular maintenance to ensure its proper functioning. This includes regular inspections, lubrication of moving parts, and replacement of worn-out components. It is important to follow the manufacturer's recommended maintenance schedule to prevent breakdowns and ensure the longevity of the coupling.
A hydraulic motor-AC generator coupling can be controlled through various means, such as manual control valves, electronic control systems, or computerized control systems. These control systems allow for precise control over the speed and power output of the coupling, making it suitable for a wide range of applications. The type of control used depends on the specific needs and requirements of the system it is being used in.