Views: 76 Author: Leapion Publish Time: 07-28-2022 Origin: Leapion
It mainly depends on the specific application situation. In short, it is necessary to determine: the nature of the load (such as horizontal or vertical load, etc.), the requirements for torque, inertia, speed, accuracy, acceleration, and deceleration, and the requirements for upper control (such as port interface and Communication requirements), the main control method is position, torque or speed. The power supply is DC or AC power, or a battery-powered voltage range. Based on this, determine the model of the motor and the associated drive or controller
What kind of motor to choose should be decided according to the specific application, every motor has its characteristics
According to the current of the motor, it chooses to use a driver that is greater than or equal to this current. If low vibration or high precision is required, it can use a subdivision driver. For high-torque motors, use high-voltage drivers as much as possible to obtain good high-speed performance
The 2-phase motor has low cost, but the vibration is large at low speed, and the torque drops quickly at high speed. The 5-phase motor has less vibration and good high-speed performance. It is 30-50% faster than the 2-phase motor and can replace the servo motor someplace.
DC servo motors are divided into brushed and brushless motors. The brushed motor has low cost, a simple structure, large starting torque, wide speed regulation range, easy control, and requires maintenance, but it is easy to maintain (replacement of carbon brushes), generates electromagnetic interference, and has environmental requirements. Therefore, it can be used in cost-sensitive general industrial and civil applications. The brushless motor is small in size, light in weight, large in output, fast in response, high in speed, small in inertia, smooth in rotation, and stable in torque. The control is complex, and it is easy to realize intelligence. Its electronic commutation mode is flexible, and it can be square wave commutation or sine wave commutation. The motor is maintenance-free, has high efficiency, low operating temperature, small electromagnetic radiation, and long life, and can be used in various environments. The AC servo motor is also a brushless motor, which is divided into synchronous and asynchronous motors. At present, synchronous motors are generally used in motion control. It has a large power range and can achieve large power. Large inertia, low maximum rotational speed, and decreases rapidly as power increases. Therefore, it is suitable for applications that operate smoothly at low speeds.
Check the following before power-on operation:
1) Whether the power supply voltage is appropriate (overvoltage may cause damage to the drive module); the +/- polarities of the DC input must not be wrongly connected, and whether the motor model or current setting value on the drive controller is appropriate (not too large at the beginning );
2) The control signal line is firmly connected, and it is best to consider the shielding problem (such as using twisted pair) in the industrial field;
3) Don't connect all the wires that need to be connected at the beginning, only connect to the most basic system, and then connect gradually after the operation is good.
4) Be sure to figure out the grounding method, or use floating.
5) Within half an hour of starting to run, closely observe the state of the motor, such as whether the movement is normal, the sound and temperature rise, and immediately stop and adjust if any problems are found.
Generally, the following aspects should be considered for inspection:
1) Whether the motor torque is large enough and whether it can drive the load, we generally recommend that users choose a motor with a torque 50%~100% larger than the actual need when selecting models because the stepping motor cannot be overloaded, even for an instant, it will cause loss. Step, stop, or move in place repeatedly in severe cases.
2) Whether the current of the input walking pulse from the host controller is large enough (usually >10mA) to make the optocoupler turn on stably, and whether the input frequency is too high so that it cannot be received if the output circuit of the host controller is CMOS If the circuit is used, a CMOS input type driver should also be selected.
3) Whether the starting frequency is too high, and whether the acceleration process is set on the starting program, it is best to start accelerating from the starting frequency specified by the motor to the set frequency, even if the acceleration time is very short, otherwise, it may be unstable or even in an inert state.
4) When the motor is not fixed, this situation sometimes occurs, which is normal. Because the strong resonance of the motor is caused at this time, which leads to the out-of-step state. The motor must be fixed
5) For a 5-phase motor, if the phases are connected incorrectly, the motor will not work.
Yes, it is more convenient, but it is only a speed issue, and it is used for applications that do not require high response speed. If a fast response to control parameters is required, it is best to use a servo motion control card, which generally has DSP and high-speed logic processing circuits to achieve high-speed and high-precision motion control. Such as S acceleration, multi-axis interpolation, etc.
In general, it is best not to, especially for high-torque motors, unless a switching power supply with more than twice the required power is used. Because the motor is a large inductive load when it is working, it will form an instantaneous high voltage on the power supply end. The overload performance of the switching power supply is not good, it will protect the shutdown, and its precise voltage regulation performance is not required, which may sometimes cause damage to the switching power supply and the driver. A DC power source that can be transformed with a conventional toroidal or R-type transformer.
Yes, but requires additional conversion modules.
Yes, but it needs to be equipped with an encoder to the tachometer signal module.
It is forbidden to disassemble, because the quartz plate in the code disc is easily broken, and after entering the dust, the life and accuracy will not be guaranteed, and professional maintenance is required.
No, it is better to let the manufacturer do it. After disassembly, it is difficult to install it back to its original state without professional equipment, and the gap between the rotor and stator of the motor cannot be guaranteed. The performance of the magnetic steel material is destroyed, even causing loss of magnetism, and the motor torque is greatly reduced.
If you encounter the set resistance, stop, return or maintain a certain thrust to follow up.
In principle, it is possible, but it is necessary to know the technical parameters of the motor before it can be used, otherwise, it will greatly reduce the due effect, and even affect the long-term operation and life. It is best to consult with the supplier before deciding
Normally this is not a problem as long as the motor is running within the set speed and current limits. Because the motor speed is proportional to the motor line voltage, selecting a certain supply voltage will not cause Overspeed, but failures such as the drive may occur. In addition, it must be ensured that the motor meets the minimum inductance requirements of the drive and that the current limit set is less than or equal to the rated current of the motor. If you can make the motor run slower (below-rated voltage) in your design, it's good that running at a lower voltage (and therefore lower speed) will make the brush run bounce back Less and less brush/commutator wear, lower current consumption and longer motor life. On the other hand, if the motor size and performance requirements require additional torque and speed, overdriving the motor is fine, but at the expense of product life.
It is recommended to select a power supply voltage value that is 10%-50% higher than the maximum required voltage. This percentage varies with Kt, Ke, and voltage drop within the system. The current value of the driver should be sufficient to deliver the energy required by the application. Remember that the output voltage value of the driver is not the same as the supply voltage, so the output current of the driver is also not the same as the input current. To determine the proper supply current, calculate all power requirements for this application and add another 5%. The required current value can be obtained by calculating according to the formula I = P/V. It is recommended to select a power supply voltage value that is 10%-50% higher than the maximum required voltage. This percentage varies with Kt, Ke, and voltage drop within the system. The current value of the driver should be sufficient to deliver the energy required by the application. Remember that the output voltage value of the driver is not the same as the supply voltage, so the output current of the driver is also not the same as the input current. To determine the proper supply current, calculate all power requirements for this application and add another 5%. According to the formula of I = P/V, the required current value can be obtained.
The different modes are not all present in all models of drives.
1) If there is no isolation between the AC power supply and the drive DC bus (such as a transformer), do not connect the non-isolated port of the DC bus or the ground of the non-isolated signal to the ground, this may cause equipment damage and personal injury. Because the AC common voltage is not to the ground, there may be a high voltage between the DC bus ground and the ground.
2) In most servo systems, all common grounds and grounds are connected at the signal end. Ground loops created by multiple ways of connecting the earth are susceptible to noise and flow at different reference points.
3) To keep the command reference voltage constant, connect the signal ground of the driver to the signal ground of the controller. It will also be connected to the ground of the external power supply, which will affect the work of the controller and driver (eg: 5V power supply of the encoder).
4) It is more difficult to ground the shielding layer, and there are several methods. The correct shield ground is at the reference potential point inside its circuit. This point depends on whether the noise source and receiver are grounded at the same time, or floating. Make sure that the shield is grounded at the same point so that the ground current does not flow through the shield.
Many reduction ratios will far exceed the torque rating of the reducer if the maximum continuous torque produced by the motor through the reducer is taken into account. If we were to design each reducer to match full torque, the reducer's internal gears would have too many combinations (larger volume and more material). This will make the product price high, and violate the product's "high performance, small size" principle.
Planetary reducers are generally used when high torque is required in a limited space, that is, small volume and large torque, and their reliability and life are better than spur gear reducers. Spur gear reducers are used for lower current consumption, low noise, and high efficiency and low-cost applications.
The duty cycle refers to the ratio of the working time / (working time + non-working time) of the motor in each working cycle. If the load factor is low, the motor is allowed to run at 3 times the continuous current for short periods, thus producing more power than when running at rated continuous.
Generally, it is possible. You can think of linear motors as rotary motors, such as linear stepper motors, brushed, brushless, and AC linear motors. Please consult the supplier for details.
Yes, according to the user's requirements, we can install the balance device of the mover slider or install the guide rail brake for vertical installation.
Yes. As long as several movers do not interfere with each other.
Can. As long as several movers do not interfere with each other.
Since there is no mechanical connection between the stator and the mover, the problems of backlash, wear, and blocking is eliminated, and the movement is smoother. It highlights the characteristics of higher precision, high speed, high acceleration, fast response, smooth motion, high control precision, good reliability, compact size, low profile height, long life, and maintenance-free.
Another selection suggestion for users is that if it is not necessary, the three main parameters of push-pull or load, speed, and positioning accuracy should not be very high at the same time, because the actuator is a high-precision and high-tech mechatronics product, We need to consider and select the corresponding motor, drive controller and feedback device from the aspects of mechanical structure, electrical performance, material characteristics, materials and processing methods when designing and manufacturing, as well as guide rails, screw rods, supports of different precision levels The seat and other mechanical systems can achieve the required overall motion parameters, which can be described as a product that drives the whole body. Of course, if you have high-demand product needs, we can still meet them, but the cost will increase accordingly.
