How to Control the Forward and Reverse Current of the Electric Machine with Diode
The one-way conducting characteristic of the LED can be used to control the forward and backward current of the motor. For example, in a circuit, there are S1 and S2 limit switches (light touch switch) and D1 and D2 two ordinary switches (such as 1N4007). When the power supply is connected, if the motor is rotating forward, the normally closed switch S1 and S2 are closed, and D1 and D2 are short-circuited at this time. The current flows through the motor directly through the two switches to realize the forward rotation of the motor. When the motor power supply is reversed, the current flows through the direct current motor, S2, and D1 to the Ground to form a closed loop, and the motor is reversed. In addition, if the two colored lights were used in the circuit to indicate the positive and negative rotation directions of the motor, when the red indicator light was on (assuming that the corresponding current was from top to bottom), it meant that the motor was rotating in the positive direction, and when the green indicator light was on (assuming that the corresponding current was from bottom to top), it meant that the motor was rotating in the reverse direction. This also reflected the relationship between the light and the direction of rotation of the motor (current direction). Read more exciting novels for free
The principle of using a relay to control the forward and reverse rotation of the washing machine
The washing machine's reversing control circuit was usually powered by an alternating current power supply. In the circuit design of using the relay to control the forward and reverse rotation of the washing machine, factors such as the forward and reverse rotation of the motor and safety needed to be considered. The relay could be used as an electronic switch to change the direction of the current flow by controlling the switching state of the circuit, thereby controlling the direction of the motor. Specifically, when the state of the relay in the circuit changes, the cascaded connection of the main (secondary) winding will be changed to another secondary (primary) winding, or when the motor is disconnected from the power supply, the head and tail ends of any set of winding in the primary and secondary winding will be exchanged, so as to achieve the forward and reverse rotation of the washing machine motor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Air conditioner, cooling machine, forward or reverse
During normal cooling work, the fan of the air conditioner usually rotated clockwise. However, some air-conditioning units had an automatic cleaning function (such as Kelon air-conditioning units). After the cleaning function was turned on, the fan would rotate counterclockwise. Its main function was to blow off the soil on the outdoor unit's heat sink (cooler). There was no fixed mode, which was determined by the external fan used by the air conditioner manufacturer. However, the final effect was the same. They were all suction type, blowing forward. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Diode Reverse Circuit Diagram Test
How to control the forward and reverse of the frequency changer
In some situations, it is necessary to control the forward and reverse rotation of the frequency changer. Double switches can be used to realize the forward and reverse rotation start and stop. For example, a maintaining switch was connected to the forward rotation terminal of the frequency changer (some were FWD, here was DI1). When this switch was closed, the frequency changer would rotate forward. After the switch was opened, the frequency changer would stop directly. Similarly, another holding switch is connected to the reversing terminal of the frequency changer (some are REV, here is DI2). When this switch is closed, the frequency changer will reverse. When the switch is opened, the frequency changer stops running. If there is no external regulator, the frequency value of the frequency changer can be set through the panel. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reverse Connection Diagram of Single-phase Electric Machine
The following are several types of single-phase motor reverse connection methods: 1. For a motor with two identical winding and three-terminal connection (1/3 is the common terminal of the two winding, connected to L of the AC power supply, and 2/4 terminal is connected with the starting capacity), if the N terminal of the AC power supply is connected to terminal 2 for forward rotation, then N is connected to terminal 4 for reverse rotation. 2. For the agricultural single-phase motor (the main/secondary winding is different, there are four terminal: 1/2 for the main winding, 3/4 for the secondary winding), the two copper plates can be connected vertically to achieve reversal (the starting capacity, CPR, is connected between V2 and Ce, the running capacity, CPR, is connected between E and Ce, and the live line and neutral line are connected). 3. Another method was to cut the wires to connect to T1 and T2 of the reversing switch, and the other one was short-circuited to L1 and L2. The wires connecting U1 and W1 were also cut to connect to L3 and T3, and then connected to 220V alternating current to achieve reversal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reverse rotation of two direct current electric machines
There were many ways to realize the positive and negative rotation of a direct current motor: 1. ** Manual Control-Mechanical Switch **: A double-pole double-throw switch is used to realize the forward and reverse rotation of a single direct current motor. If you want to control two direct current motor, you can equip each motor with a double-pole double-throw switch. The connection method is that when the switch is turned up, the A pole of the direct current motor will be connected to Vac, and the B pole will be connected to Ground, and the motor will rotate forward (reverse). When the switch is turned down, the B pole of the direct current motor will be connected to Vac, and the A pole will be connected to Ground, and the motor will rotate backward (forward). 2. ** Relays Control **: Dual relay can also be used to achieve forward and backward rotation of the direct current motor. The principle was similar to a mechanical switch, but the relay could be programmed to automatically control it. For the two direct current electric machines, two two-way relaying were required. When the relay is not working, the A pole of the direct current motor is connected to the true voltage, the B pole is connected to the voltage, and the motor is rotating forward (reverse); when the relay is connected, the B pole of the direct current motor is connected to the true voltage, the A pole is connected to the voltage, and the motor is rotating backward (forward). 3. ** Transcendence control **: The positive and negative rotation of the direct current motor can be achieved by controlling the high and low level of the input port. For the two direct current electric machines, they needed to build their own control circuits. For example, when P00 is at a low level, Q4 is turned off, Q3 is turned on, Q1 and Q6 are turned on, Q2 and Q5 are turned off, the left end of the direct current motor is positive, the right end is negative, and the motor is rotating in the forward direction (reverse direction); when P00 is at a high level, Q4 is turned on, Q3 is turned off, Q2 and Q5 are turned on, Q1 and Q6 are turned off, the left end of the direct current motor is negative, the right end is positive, and the motor is rotating in reverse direction (forward direction). 4. ** Use a motor drive board **: If you don't want to design your own circuit, you can buy a motor drive board, such as the L298N module, which can realize two-way motor control. It can not only control the forward and reverse rotation, but also realize the speed regulation function. When controlling the forward and reverse rotation of the two direct current motor, it was also necessary to consider whether the power supply could meet the needs of the two motor working at the same time, as well as the overall circuit layout, heat dissipation and other issues to ensure stable and reliable operation of the system. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
High-frequency Diode with High Reverse Resistance
Among the high-frequency lasers, the Fast Recovery Diode (FRD) had a short reverse recovery time and a large reverse resistance under high-frequency operating conditions. It could reduce switching losses and improve circuit efficiency. It was widely used in high-frequency switching power supplies, Inverters, power factor correction circuits, and so on. In addition, the BaV99 model has a strong reverse voltage capability, suitable for high-frequency applications. Its reverse resistance is large, and it can be used as signal detection, rectify, reverse protection, etc. in the circuit. It is also suitable for high-frequency amplifier, frequency splitter, detector, limiters, multi-way switch and other circuits. It is also commonly used to protect the circuit from static interference and over-voltage, especially in car electronics and high-speed communication systems. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Can the soft starter control the forward and reverse rotation?
Yes, the soft starter could control the motor to rotate forward and backward. The main function of the soft starter was to reduce the current impact when the motor was started. In addition to the basic starting protection function, modern soft starter usually also had the function of forward and reverse control. The soft starter controls the starting process of the motor by adjusting the voltage and frequency of the motor, thus achieving smooth start and stop. When controlling the forward and reverse rotation of the motor, there would be a set of circuits inside the soft starter to switch the power phase sequence of the motor. The phase sequence of the three-phase power supply of the motor determines the direction of rotation of the motor. Therefore, by changing the phase sequence, the forward and backward rotation of the motor can be realized. This phase sequence change was usually achieved through the control button on the soft starter panel or an external control signal. However, in practical applications, it was also necessary to consider whether the motor itself supported forward and reverse rotation, whether the soft starter had enough capacity to meet the starting requirements of the motor when it was in forward and reverse rotation, and whether the control system design could ensure the smoothness and safety of the forward and reverse rotation switching. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Analysis of the Circuit Diagram for Measuring the Reverse Characteristic of Diode
In the circuit diagram for measuring the reverse characteristics of the circuit, the circuit was connected in the reverse direction, that is, the positive pole of the power supply was connected to N, and the negative pole was connected to P. In this connection method, the direction of the external electric field was the same as the direction of the internal electric field of the junction, which would strengthen the internal electric field, making the thickness of the depletion layer wider and the space charge larger. This made it more difficult for the holes in the P region and the free electrons in the N region to pass through the junction, and the current was greatly reduced. At this time, the current through the junction was mainly drift current. Since the concentration of minority carriers does not change when the temperature is constant, the reverse current does not change with the applied voltage within a certain range. This current is called the reverse saturation current. In the measuring circuit, by changing the size of the variable resistance, the reverse current flowing through the LED under different values of terminal voltage could be measured, thereby depicting the reverse characteristic curve of the LED. From the perspective of the V-A characteristic curve of the LED, the bottom left part is the reverse characteristic part, which can be used to analyze the relevant data and phenomena in the reverse characteristic measurement circuit of the LED, such as the reverse breakdown voltage and other parameters. When the reverse voltage exceeds a certain value, the reverse current will suddenly increase, and this voltage value is the reverse breakdown voltage. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Plc control motor forward and reverse rotation start delay
The following is an example of how to realize the delay of the positive and negative rotation of the motor: ** 1. Electric Connection ** 1. ** Electric motor control circuit ** - The motor has two control modes, remote control and local control. The switch can be used for conversion. The local control is started by the button beside the machine. Generally, the self-reset button is used. Press the start button and release the stop button. The remote control was controlled by the PC to start and stop the motor. - The output points (such as Q1.0 and Q1.1) of the PC control the intermediate relay coil, which in turn controls the suction of the contactors-K01 and-K02 to control the start and stop of the motor. Here, two self-reset buttons (such as- S11, - S12) are used as the start enable, and- S13 is used as the motor stop signal. The I/O point of the PC and the motor control circuit have corresponding electrical connections. 2. ** Principle ** - Take the forward rotation control as an example. Press the- S11 button, and the I0.2 of the PC will input a pulse signal. After the "PR" trigger (reset priority), the relevant signal will become 1 and start the delay timer (such as T10). After a certain delay time (such as 10 seconds), the forward rotation command will be issued to make Q1.0 become 1, and the motor will run forward. During this process, if the stop button- S13 is pressed, the relevant signals will change and stop the motor operation or the timer. The principle of reverse control was similar. ** 2. Program Control ** 1. ** Signal processing ** - First, scan the input signal status to obtain the status information of the start button, stop button, and so on. 2. ** Forward and Reverse Delay Logics ** - When the start enable signal arrives (such as pressing the forward start button- S11 or reverse start button- S12), start the delay timer first. Before the delay time of the timer is up, the motor will not start. For example, in the forward rotation, after the timer delays for 10 seconds, the relevant operation command signal becomes 1, and when it is 1 at the same time as the forward rotation control signal, after the "and" operation, the output signal of the output point of the Plc (such as Q1.0) makes the motor rotate forward. The same is true for reverse rotation, but the corresponding output point of the Plc (such as Q1.1) controls the reversing contactors. - During the operation of the motor, if the stop button is pressed, it will change the relevant logic signal, causing the motor to stop running, and the timer will stop counting (if it is still in the counting state) until the next time there is a start signal. The same logic could be applied to the mitsui plcs, for example, by setting appropriate instructions and logical judgments to achieve the delay of the motor's positive and negative rotation. At the same time, in practical applications, factors such as the power of the motor, the stability of the control method, and safety needed to be considered. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>