Week Five study notes

• Control motor of Interest

This week to learn the control of the motor, let me think of this time has been very interested in the steering machine .

Rudder is also called Servo motor, the earliest for the ship to achieve its steering function, the size of the rudder from the outside outfitting in accordance with the norms of classification society, the selection of the main consideration of torque size.

In space, the rudder is widely used. In space, the pitch, yaw and roll movement of the missile attitude change are all coordinated by the rudder. Servos are used in many engineering applications and are not limited to ships. And because the rotation can be controlled continuously by the program, the intelligent Trolley is widely used to realize the steering and various joint motion of the robot.

General industrial ships with servos classification : Marine Rudder current multi-use liquid type, that is, the hydraulic equipment by the electric equipment remote control operation. There are two types: one is reciprocating plunger type rudder, the principle is through the conversion of high and low pressure oil to produce a linear motion, and through the rudder handle converted to rotational motion. The other is a rotary vane rudder, the principle is that high and low pressure oil directly acting on the rotor, small and efficient, but high cost.

The difference between the two types of servos : Reciprocating plunger-type rudder to bear the load-bearing rudder system, the rudder bearing to locate, the rudder handle of the pressure of only a few millimeters, and the rotary vane servos do not need to be on the rudder, the rudder directly load-bearing, but in the rudder platform needs to consider the water tightness, the pressure of the rudder handle Reciprocating plunger type servos have larger requirements for size. Reciprocating plunger type rudder can be deflected to one side less than 40 °, the rotary vane type Rudder can reach 70 °. The function of hydraulic system is high and low pressure conversion, and the pressure loss is converted into mechanical motion. Includes 1. High pressure pump set (provide pressure oil) 2. Control and operation of equipment 3. Actuator (oil motor, cylinder plunger, etc.).

Construction: The rudder is mainly composed of shell, circuit board, non-core motor, gear and position detector. The principle is that the receiver signals to the rudder, through the IC on the circuit board to determine the direction of rotation, and then drive the non-core motor began to turn, through the deceleration gear to transfer power to the swing arm, while the position detector sent back to the signal, determine whether the positioning has been reached. Position detector is actually a variable resistor, when the steering gear rotation resistance value will also change, by detecting the resistance value will know the angle of rotation. The general servo motor is winding the fine copper wire on the three-pole rotor, when the current flows through the coil will produce a magnetic field, and the rotor periphery of the magnet to create repulsion, and thus produce rotational force. According to the principle of physics, the moment of inertia of an object is proportional to its mass, so the greater the mass of the object, the greater the force required to rotate it. Rudder for speed, low power consumption, so the fine copper wire wound into a very thin hollow cylinder, the formation of a very light-weight non-polar hollow rotor, and the magnet placed in the cylinder, which is no core motor. In order to fit different working environment, there is waterproof and dustproof design of the rudder, and due to different load demand, the gear of the rudder has a distinction between plastic and metal, the steering gear of metal gears are generally large torque and high-speed type, with the gear will not be excessive load and the advantages of disintegrating teeth. The higher-level rudder device ball bearings make the rotation more light and precise. Ball bearings have one and two difference, of course, two are better. Currently the new FET servos are mainly using FET (field Effect transistor) field-effect transistors. FET has the advantage of low internal resistance, so the current loss is less than ordinary transistors. Of course these are not the most attractive to me, I am most interested in the application of the servo to the model robot and the intelligent trolley, like this: steering gear is a steering control mechanism, with small size, torque, external mechanical design simple, high stability characteristics, whether in hardware design or software design, rudder design is a part of the important parts of the car controlpointsThe servos are generally composed of: the place where you feel you need to know more is:This is an important part of the development and use of servos for the proper selection of servos and for more precise control of the servo system. two • Browse the national standard "preparation of gb-t6988 Electrical technology documents"after browsing, learn that a complete electrical drawing should include:

1. drawings Catalog 2 parts List 3 Electrical cabinet Dimensions drawing 4 component layout Diagram 5 electrical schematic (including plc input and output contact diagram in electrical schematic diagram; terminal arrangement diagram; program diagram; parameter setting list, etc.)

Three · Browse Schneider Electric's website for commonly used low-voltage appliances.

Two home low voltage appliances were selected:

1.IC Illumination Control Element Select model CCT15284

Http://www.schneider-electric.cn/zh/product-range-selector/843-ic-zhaomingkongzhiyuanjian/?filter= business-5-zhinengshenghuokongjian&parent-category-id=1600

Power consumption: 6VA

Maximum switching current: A-250 V AC PF = 1
A-250 V AC PF = 0.6

Rated operating voltage: V (+10 -15) AC 50/60 Hz

Time delay: ≥ 60 seconds (delay before disconnection)
≥ 60 seconds (delay before switching on)

2. Uninterruptible power supply

Bk1000y-ch

APC back-ups 1000VA, 220V, China backup battery and surge protector for electronics and computers

http://www.schneider-electric.cn/zh/home/house-electrical-products/battery-backup-and-surge-protection/ back-ups-bk1000y-ch.jsp

Week Five study notes