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What is a dynamometer?

A device, connecting the main shaft of the engine (or gearbox) to the main shaft of the dynamometer absorbs the tension. Such a device which controls torque and speed is called a dynamometer.
The dynamometer is not just a measuring device, it is the device which controls the operation process.

◆The dynamometers generally divided

大別して下記があります。

  1. Hydraulic dynamometer
  2. Electric dynamometer (eddy current)
  3. Electric dynamometer (alternating current)

1、Hydraulic dynamometer

The company Fuchino has CFT and CF types. (particularly refer to the technical catalog)
The user can give them the necessary load by controlling the discharge of water, water supply and drain from the dynamometer.
Our customers are very satisfied with the simple structure of the Fuchino hydraulic dynamometer.
It differs from other companies since there are no springs to adjust the pressure, and therefore it minimalize amount of supplies.

2、Electrical dynamometer (eddy current)

Electricity flows through the dynamometer to form a magnetic current, which controls the rotor teeth resulting braking moment.
The device is similar to the meter for domestic electricity, where the load depends on the supplied voltage.

3、Electric dynamometer (alternating current)

Electric dynamometer not only absorbs but also can perform the function of the drive, with the help of which it is possible to take readings of the mechanical losses.
Previously we used electric dynamometer DC, but now we began to apply AC dynamometer.

History of the dynamometer

それは18世紀後半から19世紀の前半に英国にて起こった「産業革命」に始まります。
その頃発明された内燃機関(スチームタービン)の出力がどれだけの値かを試験するために考案されたのが動力計です。
つまり世界最古の試験機です。

History of Fuchino company

In 1956 plant “Fucino” was founded, and Masayuki Fuchino became the director having “Nakajima Hikouki” company’s engineers.
In 1999 Joint Stock Company “Fuchino” was founded.

Our achievements

We tested different engines with power ranging from 0.75KW to 125.000KW.
At the moment, we are constructing the world’s biggest ynamometer of 350.000KW for a nuclear-powered engine.

Accuracy and its adjustment.

The accuracy depends on how much tension can body absorb and is water moving on(without matching)

  1. To adjust friction on bearings that fix the body – change the position of the roller at 90 degrees.
  2. Whether water (supply and discharge) pipe is parallel to the shaft – lay an iron plate or cut the plate the strain gauge is on.
  3. To check a gap between the dynamometer’s lever and the concern gauge – lay an iron plate under the strain gauge.
  4. Check an accuracy of the gauge.
  5. Check an exactness of the strain gauge amplifier.

Damage to the main shaft bearing.

  1. Stop the oil pump – change the pump, clean the oil tank, change oil, and change the sealing on the shaft bearing and the shaft.
  2. Check the filter-cleaning filter, changing the shaft bearing, oil tank cleaning, oil changes.
  3. Oil change
    Cleaning the oil tank, change the oil (VG # 32 series), change the bearing of the main shaft.
    * It is necessary to clean the oil system from point 1 to point 3.
  4. Check the main shaft bearing, if there is a gap it is necessary to remove it with a protection ring or make the necessary adjustments to eliminate the gap, to make sure whether the shaft bearing has a right angle to the main shaft.
  5. Make sure that the parameters of the main shaft bearing are right.

* Above-mentioned items (1) and (2) have a completely different meaning.
* Measurement accuracy is the body and the frictional resistance of the outside.
* High temperature of the main shaft bearing and its damage indicate a problem in the device.

Possible mechanical damage of the dynamometer

  1. Damage due to the friction of the main shaft bearing.
  2. Damage of sealing materials.
  3. Alternation of water amount from the rotor flow to the stator.

All of the above mentioned causes can be explained with a single answer.
Dynamometer body is constantly in a suspended position, which means that all the resistance and changes can be read by using a strain gauge, lever and through the body of the dynamometer itself.
That means, besides the above mentioned problems nothing more can happen.

* All of the rotors used in the CFT series were made with special technology. Our customers are always satisfied with our accuracy and reliability of products.

On cavitation

-Frequently asked questions of this type are concerned with the material of products.
But problems due to material almost do not exist.
Our experience shows that when the internal pressure of the dynamometer is equal to the negative pressure, the air gets inside and cavitation occurs.
If there is normal pressure within the housing, the cavitation occurs. (when water draining achieves the temperature below 80 C degrees)  

Issues whithout a problem = BC,ALBC,SCS,SC45

Features of the CF

  1. High accuracy
  2. High-speed and precise control
  3. High reliability
  4. Simple management
  5. High-level safety

1. High accuracy.

1) We use strain gauge of a closed type. Our company has the longest history in Japan to use the strain gauge to the equipment. Closed-type strain gauge is not affected by temperature and humidity, is able to perform high-quality work.
Our company also uses a train gauges of the highest quality worldwide.
2) Dynamometer on low speed may start measuring from 0.1rpm
3) Accuracy of holes on the rotor is within 2% of the mean, which stabilizes the test.

2. High-speed and precise control.

1) The load control valve operates with optical precision below 1/3300, when using a high quality detector.
The automatic drain valve has a special form, which is regulated by means of closed-end high-speed engine and straightens the water drain.

3.High-level reliability

1) In order to avoid cavitation the system uses instant control valve on the drain.
2) All parts including the main shaft are made under the close control of the company.
3) Special system and system card are not used on the control panel. The device is of f high accuracy and reliability (can withstand temperatures of up to + -25C degrees to +85C degrees / under operation it is from 0 C degrees to +55C degrees, we use the resistance noise group 1, class-A. The device has passed the test of resistance to vibration of the Japanese Industrial Standard JISB3502 ) The programming is a modular one.
4) The device has a touch screen with which you can avoid problems at work.

4. Simple Management

1) It is equipped with an axis adjust device.
(Not available on the CFT series)
2) Oil cooler and filter are in the oil device.
3) Proportional-Integral-differentiating (PID) controller can be operated during the test work that provides you the ideal conditions for testing.
4) It is possible to change the unit of measurement of torque and other parameters during the test work. It is also possible to connect an external computer with a control panel which helps if necessary to establish the system.
Naturally, all PID information will be displayed on an external computer.
5) The leakproofness of the system eliminates the flow of water feeding and at the outlet side.
6) The leak resistance of the oil system is guaranteed, with makes possible the re-testings at any time.

5. High-level safety

1) There is a reduction gear (ratio 1/50) in front of the high-precision and high-speed electro-valve which is controlled with the AC motor
Even with a sudden break in the power supply (power failure) it leaves the valve from moving to prevent damage to the equipment.

Features of the CFT

  1. High accuracy
  2. High-speed and precise control
  3. High reliability
  4. Simple management
  5. High-level safety

1.High accuracy.

1) We use strain gauge of a closed type. Our company has the longest history in Japan to use the strain gauge to the equipment. Closed-type strain gauge is not affected by temperature and humidity, is able to perform high-quality work. Our company also uses strain gauges of the highest quality worldwide.
2) Dynamometer on low speed may start measuring from 0.1rpm
3) Using the fully treated and balanced rotor you can measure a stable load and minimum vibration.

2. High-speed and precise control.

1) The load control valve operates with optical precision below 1/3300, when using a high quality detector.
The automatic drain valve has a special form, which is regulated by means of closed high-speed engine and it straightens water drain.

3. High-level reliability

1) In order to avoid cavitation the system uses instant control valve on the drain.
2) All parts including the main shaft are made under the close control of the company.
3) Special system and system card are not used on the control panel. The device is of high accuracy and reliability (can withstand temperatures of up to + -25C degrees to +85C degrees / under operation it is from 0 C degrees to +55C degrees, we use the resistance noise group 1, class-A. The device has passed the test of resistance to vibration of the Japanese Industrial Standard JISB3502 ) The programming is a modular one.
4) The device has a touch screen with which you can avoid problems at work.

4. Simple Management

1) Oil cooler and filter are in the oil device.
2) Proportional-Integral-differentiating (PID) controller can be operated during the test work that provides you the ideal conditions for testing.
3) It is possible to change the units of measurement of torque and other parameters during the test work. It is also possible to connect an external computer with a control panel which helps if necessary to establish the system.
Naturally, all PID information will be displayed on an external computer.
4) Leak resistance of the system eliminates the flow of water feeding and at the outlet side.
5) Leak resistance of the oil system is guaranteed, it makes possible retesting at any time.

5. High-level safety

1) There is a reduction gear (ratio 1/50) in front of the high-precision and high-speed electro-valve which is controlled with the AC motor.
Even with a sudden break in the power supply (power failure) it leaves the valve from moving to prevent damage to the equipment.

Features of Electric dynamometer (eddy current)

  1. High accuracy
  2. High reliability
  3. Simple management
  4. High-level safety

1. High accuracy.

(1) We use strain gauge of a closed type. Our company has the longest history in Japan to use the strain gauge to the equipment. Closed-type strain gauge is not affected by temperature and humidity, is able to perform high-quality work.
Our company also uses a train gauges of the highest quality worldwide.
(2) The production of all rotors are processed by a special technology, as are balanced. We guarantee a stable load and minimal vibration in these products.

2. High reliability

(1) In the eddy current dynamometer of our production indirect cooling system is used.
The cooling system does not apply to the rotor on the line, and that means the test will be reliable and stable.
(2) Eddy current collector is easy to be removed for cleaning.
(3) The main shaft and all parts of the device are made under the close supervision and with the use of high technology.
(4) The touch screen is used to display datum.

3. Simple management

(1) Oil cooler and filters are supplied for the oil system.
(2) Proportional-Integral-Differentiating (PID) controller can be operated during the test work that provides you the ideal conditions for testing.
(3) It is possible to change the unit of measurement of torque and other parameters during the test work. It is also possible to connect an external computer with a control panel which helps if necessary to establish the system.
Naturally, all PID information will be displayed on an external computer too.
(4) The leak resistance of the system eliminates the flow of water feeding and at the outlet side.
(5) The leak resistance of the oil system is guaranteed, which makes possible re-testing at any time.

5. High-level safety

* There are different types of alarm systems.
(1) High torque (It is possible to make the setting)
(2) High speed (It is possible to make the setting)
(3) Not enough water
(4) High temperature of drain water
(5) Drop in the oil pressure
(6) Increasing temperature of the bearing (A) (B)
(7) The pressure drop at water supply.
(8) High temperature water at the feeder.

* We provide complete reliability at work.

Modeling water flow

  1. Water enters the water flows through the valve and electrical connector PT (A) and separated into (A) and (B) in the bearing receiving portion.
    * PT connector is a large rubber gasket.
  2. The stator (A) (B) is attached to the bearing receiving part (A) (B) through which water enters into the housing.
  3. Water, after coming through the stator, is injected through the inner holes.
  4. Water which flows through the inner holes of the stator, gets to the rotor from outside inwards and vice versa. Thus we obtain a braking force.
  5. After mixing water exits through the gaps of the stator and rotor.
  6. By adjusting the drain valve, this water accumulates inside the housing.
    The volume and internal pressure of the water help us to obtain a braking force.
  7. The device flooded with water is drained by opening the drain valve.
  8. Internal tension is transmitted through the lever of fixed length and is measured using a strain gauge.
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We also acquired patents of the UK, France, Austria and Germany.