FT-2500 advanced tachometer measures the rotational speed by using the signal of change in sound, vibration or magnetic flux from rotating machines such as motor or the like.
The use of FFT technology enables the FT-2500 to calculate and display the rotational speed of any complex waveform signals from microphone, sound level meter or vibration sensor by extracting the frequency component which is equivalent to the rotational speed.
The FT-2500 has several advantages over conventional tachometers. Even though the rotating shaft is not accessible, it allows easy evaluation of the rotation object such as motor which has already been built in product. There is no need to affix reflective mark to the measurement object or special machining to the rotating shaft. A newly developed algorithm is incorporated in the FT-2500 so that not only the steady rotation of motor or engine but also the status of the accelerated/decelerated rotation can be measured with high respon
Rotational speed measurement of a DC motor with the micro rotating shaft
The rotational speed of a DC motor can be measured without attaching the reflective mark on the surface of the shaft. This example allows the rotational speed measurement of the fan, which shaft is too thin that reflective mark can not be attached or optical light can not be reflected straight when optical sensor is used.
Determining of rotating direction and rotational speed measurement of a general DC motor
It is an example to determine the rotating direction and measure the rotational speed of a DC motor by using the FT-0501 DC Motor Rotation Detector. The FT-0501 detects the magnetic flux leakage of a DC motor and extracts a frequency signal in proportion to the rotational speed.
Since the FT-0501 has two internal coils, a phase shift occurs between the two detected signals. The rotating direction is then determined by the relationship of these two phases. This function is very convenient for quality control of small DC motors, whose rotating directions may be difficult to be determined visually. Of course, it can measure the rotational speed.
