This section provides an overview for tachogenerators as well as their applications and principles. Also, please take a look at the list of 10 tachogenerator manufacturers and their company rankings.
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A tachogenerator is attached to the shaft of a motor to generate a DC voltage corresponding to the rotational speed of the motor and is used to detect the rotational speed.
Its shape is similar to that of a motor, and its internal construction is the same as that of a DC motor. It consists of a rotor, stator, and commutator (including brushes), and its output terminals have two wires, a positive pole and a negative pole.
The output terminal has two wires, a positive pole and a negative pole. Voltage is output through the brushes, but care must be taken because if the direction of connection to the output terminal is incorrect, the rotation perception will be in the opposite direction.
As mentioned in the overview, tachogenerators are mainly attached to the shafts of DC motors to detect rotational speed.
In automatic speed control of motors, the DC voltage obtained from the tachogenerators are used as feedback and multiplied by a speed reference to obtain the difference between the speed and the speed originally desired, and then the motor rotation speed is accelerated or decelerated.
In recent years, AC motors have become the mainstream, and speed detectors such as PLGs are increasingly replacing tachogenerators.
The principle of tachogenerators are similar to that of a DC motor, consisting of a stator and rotor that generate voltage and a commutator and brushes that output the voltage to the outside. This voltage is output to the outside through the commutator (brushes).
Since the direction of positive/negative induced electromotive force is reversed depending on the direction of motor rotation, the direction of rotation can be determined in addition to the rotation speed.
In the case of automatic control, if the positive/negative wiring connections are reversed, for example, if the speed reference is positive, the motor will be commanded to rotate forward, but because the feedback from the tachogenerators are negative, the forward speed command to the motor will become larger and larger, resulting in the motor accelerating more than necessary. This causes the motor to accelerate more than necessary, resulting in equipment breakdown and motor over-specification, which can lead to breakdowns.
*Including some distributors, etc.
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