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Novel Brushless Tachogenerator

The brushless speed-measuring generator means that the outer stator is fixed on the inner side of the machine base through an outer magnetic sleeve, the permanent magnetic steel is embedded in the clamping slot between the parts, and the inner stator is connected to the right end cover through the inner magnetic sleeve. A fixed speed generator.

Definition

The brushless speed-measuring generator means that the outer stator is fixed on the inner side of the machine base through an outer magnetic sleeve, the permanent magnetic steel is embedded in the clamping slot between the parts, and the inner stator is connected to the right end cover through the inner magnetic sleeve. A fixed speed generator.

Features

1. No commutation device is needed, simple structure and small error

2. The output electromotive force is proportional to the speed

Basic structure

The generator mainly includes a rotating shaft, a cup-shaped rotor, a magnetic isolation sleeve, a permanent magnet steel, a base, an inner and outer stator, and a Hall element.

Among them, the outer stator of the speed measuring generator is fixed on the inside of the machine frame through an outer magnetically-isolated sleeve; the permanent magnetic steel is embedded in a clamping slot between various parts; the inner stator is fixed with the right end cover by an inner magnetically-isolated sleeve, and the inner A through hole is provided at the center of the magnetic isolation sleeve, and the Hall element is embedded in the clamping slot between the parts; the cup wall of the cup rotor is placed in the air gap between the inner and outer stators; The permanent magnets between the Hall element and the outer stator are staggered at 45 ° from each other in space.

Principle

The magnetic field lines form a closed loop after passing through the outer stator, air gap, cup rotor, and inner stator. Because the installation position of the permanent magnet steel and the Hall element is staggered at a 45 ° angle in space, the magnetic field generated by the permanent magnet steel and the Hall element are not linked.

When the cup rotor is stationary, the constant magnetic flux generated by the permanent magnetic steel does not pass through the Hall element, so the Hall element does not generate a Hall potential; when the cup rotor starts to rotate, there is an instantaneous rotational angular velocity. At this time, the cup rotor begins to cut the constant magnetic flux of the permanent magnetic steel, and the cup body of the cup rotor is regarded as a plurality of guide bars. According to the Faraday law of electromagnetic induction, the cup rotor generates an induction corresponding to the instantaneous angular velocity Emf.

Assuming that the rotation direction of the cup rotor is counterclockwise, the induced electromotive force generates a corresponding short-circuit current, and the direction of the short-circuit current is the same as the direction of the induced emf. At this time, the short-circuit current will generate a corresponding magnetic field, which forms a closed loop after passing through the inner stator, Hall element, air gap, cup rotor and outer stator. Because the magnetic flux and the Hall element turn chain, according to the Hall effect, the Hall element generates a corresponding Hall potential.

Applicable models

Novel brushless tachogenerator are widely used in various speed or position control systems.

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