3HAB3700-1 Classification of speed measuring instruments
The speed measuring instrument has the characteristics of digital, high precision, portable, etc., and has important applications in many fields. And in the process of practical application, there are the following three types that we can often use. The following is a brief introduction to the classification of speed detection instruments:
3HAB3700-1 Centrifugal speed: Use the balance of centrifugal force and tension to indicate the speed. Centrifugal tachometer is the most traditional speed measuring tool, is the use of centrifugal force principle of mechanical tachometer; The measurement accuracy is generally 1~2, and it is generally installed on the spot. An excellent centrifugal tachometer not only has accurate and intuitive characteristics, but also has the advantages of reliability and durability. But the structure is complicated.
Magnetic tachometer: The rotating magnetic field is used to generate a rotating force on the metal cap, and the balance between the rotating force and the spring force is used to indicate the speed. Magnetic tachometer, is a successful use of magnetic force a model, is the use of magnetic principle of mechanical tachometer; Generally installed on the spot, with a flexible shaft can be installed in a short distance. Magnetic tachometer, because of its simple structure, is currently more commonly used in motorcycles and automobiles and other mechanical equipment. The flexible shaft is easily damaged when installed in different places.
3HAB3700-1 Electric tachometer: consists of a small alternator, a cable, a motor and a magnetic watch head. A small alternator produces alternating current, which is delivered through a cable and drives a small AC motor whose speed is consistent with the speed of the shaft being measured.
The magnetic speed head is coaxial connected with the small AC motor, and the speed indicated by the magnetic head is naturally the speed of the measured shaft; Electric speed, off-site installation is very convenient, good vibration resistance, widely used in diesel engines and Marine equipment.
3HAB3700-1 Magnetoelectric tachometer: magnetoelectric sensor plus ammeter, remote installation is very convenient.
Flash tachometer: Using the principle of visual retention. Flash tachometer, in addition to detecting speed (reciprocating speed), can also observe the static image of the cyclic reciprocating motion object, to understand the working state of mechanical equipment, is an essential observation tool.
Electronic tachometer: The continuous progress of electronic technology has made this kind of tachometer develop by leaps and bounds.