Third, the structure of the steering gear
The steering gear is mainly composed of a casing, a circuit board, a drive motor, a speed reducer and a position detecting element. The working principle is that the receiver sends a signal to the steering gear, drives the coreless motor through the IC on the circuit board to start rotating, transmits the power to the swing arm through the reduction gear, and sends back the signal by the position detector to determine whether it has arrived. Positioning. The position detector is actually a variable resistor. When the servo is turned, the resistance value will change. By detecting the resistance value, the angle of rotation can be known. A general servo motor winds a thin copper wire around a three-pole rotor. When a current flows through the coil, a magnetic field is generated, which causes a repulsive action with the magnet on the periphery of the rotor, thereby generating a rotational force. According to the principle of physics, the moment of inertia of an object is proportional to the mass, so the greater the mass of the object, the greater the force required. In order to achieve high speed and low power consumption, the steering gear is wound into a very thin hollow cylinder to form a very light-weight, infinitely hollow rotor, and the magnet is placed in the cylinder. This is the hollow cup motor.
In order to adapt to different working environments, there are steering gears with waterproof and dustproof design; and according to different load requirements, the gears of the steering gear are distinguished by plastic and metal. The steering gears of metal gears are generally high torque and high speed. The gear does not have the advantage of disintegrating due to excessive load. The higher-grade rudder opportunity device has a ball bearing that makes it lighter and more precise when turning. Ball bearings have one and two differences, of course, the two are better. At present, the newly introduced FET servos mainly use FET (FieldEffectTransistor) field effect transistors. FETs have the advantage of low internal resistance, so the current consumption is less than that of a typical transistor.
