Knowledge

Propellers for boats are usually of two types, left-hand and right-hand, known as CW and CCW respectively. CW is an abbreviation for Clockwise, indicating a clockwise rotating propeller, also known as a right-hand propeller. When a ship's propeller is rotating, the leading edge of the propeller blade is to the right and the trailing edge is to the left when viewed from the side, propelling the water in the same direction as the rotation. The right-hand propeller is usually mounted on the left side of the ship, i.e. the port side of the ship. CCW stands for Counterclockwise and indicates...

An electronic governor is an electronic device used to control the speed and torque of a brushless motor. The main principle is based on PWM (Pulse Width Modulation) technology and closed-loop control algorithms. In an electronic governor, PWM technology is used to control the current and speed of the motor. It controls a constant-value DC power supply through a switching tube (usually a MOSFET) to produce a square wave of a certain frequency, and controls the motor current and speed by adjusting the duty cycle of the square wave. A three-phase full-bridge circuit is usually used in electronic speed controllers...

Ⅰ. The design of underwater thruster propeller has the following aspects to consider

1、Thrust demand: it is necessary to determine the propeller diameter, torsion, number of blades and other parameters by calculating the thrust required by the thruster.

2, hydrodynamic performance: need to consider the propeller blade shape, cross-sectional shape, pitch and other parameters to achieve the best hydrodynamic performance.

3, noise and vibration: the need to optimize the structure of the propeller to reduce noise and vibration, improve the reliability and service life of the propeller.

4、Materials and manufacturing: Suitable materials and manufacturing processes need to be selected to ensure the strength, stiffness and corrosion resistance of the propeller.

A brushless motor governor, also known as a brushless ESC, is an electronic device used to control the speed of a brushless motor. The main function of a brushless motor governor is to control the speed and steering of the motor, allowing the motor to adapt to different work loads and operating environments. The working principle of a brushless motor governor is based on the induction potential of the motor and the operating characteristics of the electronics. The main components of a brushless motor governor include the power tube, the control circuit and the sensor.The power tube is the core...

Brushless motors require the use of Hall elements to detect the rotor position for proper phase change for proper motor operation. Usually two Hall elements are used to detect the rotor position. This is implemented as follows:1: Two Hall elements are mounted on the stator of the brushless motor at a certain offset angle relative to each other.2: When the rotor rotates close to the first Hall element, the element will detect the magnetic field and output a signal indicating that the rotor has turned to the corresponding position.3: Based on the received signal, the motor controller determines the current...