Dry forward and reverse rotation is better than single rotation
If the drying machine kept running in one direction, it would cause the clothes to be entangled and knotted. The forward and reverse rotation function could reduce the entanglement of clothes, making them more stretched and less prone to wrinkles, especially when dealing with large clothes. Most dryers on the market were driven by a single motor. The drum and the fan shared a motor. When the inner cylinder reversed, the fan also reversed, which would affect the circulation of the air path, and the internal heat accumulation could not be discharged. Therefore, the single-motor driven dryers could only reduce the heat accumulation by shortening the reversal time. The common positive and negative rotation ratio was 8:1, 12:1, 16:1, etc. The dual motor drive could achieve 1:1 forward and backward rotation. The drum and the fan were driven by two independent motor, and the work of the two did not affect each other, so the circulation in the wind path would not be destroyed. For example, the dual-lift heat pump series dryers of Hai Er and some dryers of Kawasaki had the function of forward and reverse rotation. The time settings of different models of Kawasaki dryers were different. For example, the KGH50 and KGH50 series had 6 minutes of forward rotation, 4 seconds of stop, and 14 seconds of reverse rotation;KGH100 - V010/KGH100-V110E had 3 minutes of forward rotation, 5 seconds of stop, and 3 minutes of reverse rotation, etc. Read more exciting novels for free
Forward and Reverse Rotation of the Servo-motor
There are three ways to change the forward and backward rotation of the servo-motor: 1. ** Setting parameters **: If you find that the current rotation direction is different from the required direction, you can change the rotation direction of the servo-motor through the "Setting parameters". 2. ** Pulse signal **: The servo-motor has three control methods: positioning control, immediate control (also known as moment control), and speed control. If it was "positioning control," he would need to change the pulse signal. There were "direction A and B" pulse signals and "direction + pulse" pulse signals. The direction of the pulse could be changed by changing the output signal of the pulse. 3. ** Forward and Reverse Rotation Terminals **: The motor connected to the forward rotation terminal will rotate forward, and the motor connected to the reverse rotation terminal will rotate backward. It should be noted that the reverse rotation of the servo-motor could not be changed by changing the "U, V, W phase sequence" like an ordinary three-phase motor, because the servo-motor was very different from an ordinary motor. The ordinary motor was an open-loop control, while the servo-motor was a real-time feedback. The internal programmer would feedback the current position of the motor. The phase sequence was pre-arranged and could not be modified at will. <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>
The difference between the reverse and forward rotation of the air conditioner
When rotating forward, the fan blades of the belt discs hit the cylinder, which is conducive to heat dissipation during work. When rotating backward, this effect is weakened, which will affect the heat dissipation of the cylinder. In other directions, it is related to the locking nuts of the two belt discs. When rotating forward, it will be tight, and when rotating backward, it will be loose, which will affect safety. In terms of the main unit of the air conditioner, if the main power supply of the screw air conditioner is removed during maintenance, pay attention to the positive and negative rotation of the motor after the power supply is connected back. The rotation direction of the motor should be based on the rotation direction of the main unit. The correct rotation direction can be checked by the rotation icon marked on the main unit. <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>
How to set the mode of the forward and reverse rotation of the frequency changer
There were two main modes for the frequency changer to realize the forward and reverse rotation of the motor: - ** External Control Mode **: - First of all, make sure that the frequency changer is properly connected to the power supply and motor. Check if the connection is firm and if the cable is loose or damaged. Then, he turned on the power of the frequency changer and waited for the start to complete. - Enter the parameters setting menu through the control panel on the frequency changer or the remote controller. In this menu, you can find the option to set up the reverse rotation. - The external switch signal must be set correctly. When the motor needs to run in the forward direction, the switch signal should be set to the forward direction. When the motor runs in the reverse direction, the switch signal should be set to the reverse direction. It must also ensure that the external switch signal is correctly connected to the input port of the frequency changer. - Different drives may have different external terminal functions for forward and reverse control. For example, in two-wire mode 1, the forward and reverse operation of the motor is determined by the terminal XX (forward operation FWD) and XY (reverse operation REV). In two-wire mode 2, the XX terminal is the operation enabling terminal, and the XY terminal function determines the direction of operation (XX forward operation FWD, XY reverse operation REV). - ** Internal Control Mode **: - Similarly, first ensure that the frequency changer is connected to the power supply and the motor, and then start the frequency changer. - He entered the parameters setting menu of the frequency changer. - According to the requirements, manually set the relevant parameters of the frequency changer, such as working frequency, working voltage and other parameters to realize the control of the motor operation direction. During the setting, you need to refer to the frequency changer user manual to ensure that it is correct. When setting the positive and negative rotation mode, you should also pay attention to: during the adjustment process, you must ensure that the motor load is within the acceptable range. If the load is too large, it may cause the motor to be overheated or damaged; pay close attention to the operation of the motor, such as temperature, noise, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The principle diagram of the motor's forward and reverse rotation swing
The principle of the three-phase induction motor's forward and reverse swing: The three-phase induction motor has three-phase winding, and the voltage of each phase winding is 120° different. When three-phase symmetrical alternating current is introduced into the three-phase winding of the stators, a rotating magnetic field is generated, and an induced current is generated by cutting the winding of the rotators. Under the effect of the rotating magnetic field of the stators, the conductor of the current carrying rotators generate electromagnetic force to form an electromagnetic moment to drive the motor to rotate, and the direction of rotation of the motor is the same as the direction of the rotating magnetic field. To achieve positive and reverse control, you only need to switch any two phases in the power supply phase sequence (such as keeping phase B unchanged and switching phase A and phase C), and make the connection on the top port of the contactors consistent, and phase adjust the lower port of the contactors. For the single-phase motor, the principle of positive and negative rotation swing: Single-phase motor is generally powered by single-phase AC power supply (AC220V). There are two-phase winding on the stators, and the rotor-type is ordinary squirrel cage. The starting winding is added to the stators. The starting winding and the main winding are separated by 90° in space. The starting winding is connected in series with a suitable capacity, so that the current of the starting winding and the main winding are separated by approximately 90° in phase, thereby generating a rotating magnetic field to make the rotor-to-start operation automatically. When the direction of rotation needs to be changed, the L wire ends of the main and auxiliary winding can be reversed to realize reverse operation. In terms of the motor reverse rotation control circuit schematics: - In the relay control circuit, such as the three-phase induction motor forward and reverse control circuit, KM1 and KM2 are AC contactors that control forward and reverse operation respectively. Two start-stop protection circuits are used to control the forward and reverse rotation of the motor respectively. When the forward rotation start button is pressed, the corresponding contactors coil is energized and the motor is rotated forward. The forward and reverse contactors will not be energized at the same time through the interlocked (including the interlocked contact of the normally closed contact of the contactors and the interlocked button). It was the same for reversal. - In the control system of the PC, the external connection diagram and the ladder diagram achieved similar functions. There was also a start-stop circuit to control the positive and negative rotation, and there were interlocked measures to prevent simultaneous output. In addition, in order to avoid the instantaneous short-circuit fault caused by the delay of the induction, the delay during the forward and reverse switching can be used (but it will increase the programming workload and cannot solve all short-circuit accidents). At the same time, in order to prevent the three-phase power short-circuit accident caused by the electric arc fusion welding when the main contact of the contactors is cut off due to the excessive current of the main circuit or the quality of the contactors, a hardware interlocked circuit composed of the auxiliary normally closed contacts of the contactors should be set outside the PC. The thermal relay was used for overload protection. The thermal relay with different reset functions (manual reset or automatic reset) had different contact connection methods. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
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>
What's the difference between a forward and a reverse rotation of an air conditioner?
The fan blades of the forward rotating belt reel are directed to the cylinder, which is beneficial to the heat dissipation during work, and the weakened effect during reverse rotation affects the heat dissipation of the cylinder; the other direction is related to the locking nuts of the two belt reel, which is tight in the forward direction and loose in the reverse direction, which affects the safety. The positive and negative rotation of the main motor of the air conditioner should be based on the rotation direction of the main machine. The correct rotation direction of the main machine of the air conditioner can be checked by the rotation icon marked on the main machine. From the perspective of heat dissipation and the locking nut of the belt, there was a difference between forward and reverse rotation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How long does the forward and reverse rotation of the servo-motor delay?
In the given data, there was an example of a delay of 1 second after three revolutions of the motor, and a delay of 1 second after three revolutions. However, this was only a delay in a specific example, and it did not indicate that this was a universal forward and reverse rotation delay standard. Therefore, based on the available information, it was impossible to determine the standard delay time of the forward and reverse rotation of the servo-motor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Forward and reverse rotation of electric motor plus sequence starting template
The motor reversing plus sequence starting circuit mainly involves the following components and connection logic: ** 1. Prepare the components ** 1. ** button ** - It required a stop button, a forward rotation start button, and a reverse rotation start button. 2. ** Contactor ** - Two contactors were required, and the contactors needed to have auxiliary contacts that were normally open and normally closed (for example, the 1211 contactors). 3. ** Electric motor ** - If two electric machines were to be started in sequence (electric machine 1 and electric machine 2), the starting sequence logic control circuit between the electric machines should also be considered. ** 2. Circuit connection and working principle (Take two electric machines as an example)** 1. ** Forward and Reverse Circuit Connection and Principle ** - When the start button was pressed, the corresponding contactors were energized and the motor turned forward. At this time, the normally closed contact of the forward rotating contactors was disconnected to achieve the interlocked, so pressing the reverse start button when the motor was rotating forward had no effect. When the motor was rotating forward, the start button was released, and the motor was self-locked and continued to rotate forward. Only by pressing the stop button, the motor would stop, the forward rotating contactors would lose power, and the normally closed contacts would return to the connected state. - When the reverse start button was pressed, the other contactors were energized and the motor reversed. At this time, the normally closed contact of the reversing contactors was disconnected to achieve the interlocked. Pressing the forward start button when the motor was reversing had no effect. When reversing, release the start button, and the motor will self-lock to maintain reverse operation. 2. ** Sequential Starting Circuit Connection and Principle ** - If the motor 2 is directly started without starting the motor 1, the motor 2 cannot be started. When the start button of the motor 1 is pressed, the motor 1 starts. After starting up the motor 1, press the start button of the motor 2, and the motor 2 can start up normally. - When stopping, if you stop the motor 1 first and press the stop button of the motor 1, the motor will not stop. Only when you press the stop button of the motor 2 first, the motor 2 will stop, and then press the stop button of the motor 1, the motor 1 can stop normally. In the actual connection, pay attention to the winding connection method according to different motor types (such as three-phase motor, single-phase capacity starter motor, etc.). For a single-phase condenser-start motor, there is a main winding and a secondary winding. When the secondary winding is connected in series with the voltage circuit, there is a corresponding connection relationship with the main winding. At the same time, pay attention to the rated voltage, current and other parameters of each component to ensure that the circuit works normally. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>