The servo motor is an engine that controls the operation of the mechanical components in the servo system, and is an auxiliary motor indirect shifting device. The servo motor is an electro-mechanical converter that can rotate continuously. The servo motor as a hydraulic valve controller is a micro-motor with a small power. Servo motors are divided into DC servo motors and AC servo motors. Permanent magnet DC servo motors and parallel DC servo motors are most commonly used.
The servo motor can control the speed and position accuracy very accurately, and can convert the voltage signal into torque and speed to drive the control object. The servo motor rotor speed is controlled by the input signal and can react quickly. It is used as an actuator in the automatic control system, and has the characteristics of small electromechanical time constant, high linearity, and starting voltage, which can receive the received electrical signal. Converted to an angular displacement or angular velocity output on the motor shaft. Divided into two major categories of DC and AC servo motor, its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the rotation speed decreases uniformly with the increase of torque.
The servo motor is used inside a closed loop. That is to say, it transmits the signal to the system at any time, and at the same time, the signal given by the system is used to correct its operation.
　　 1. Accuracy: realizes closed-loop control of position, speed and torque; overcomes the problem of stepping motor out of step;
2, the speed: high-speed performance is good, the general rated speed can reach 2000 ~ 3000 rpm;
3. Adaptability: It has strong anti-overload capability and can withstand three times the rated torque. It is especially suitable for occasions with transient load fluctuations and quick start.
4. Stable: It runs smoothly at low speed, and does not produce stepping operation similar to stepper motor when running at low speed. Suitable for occasions with high speed response requirements;
5. Timeliness: The dynamics of motor acceleration and deceleration are short, generally within tens of milliseconds;
6, comfort: heat and noise are significantly reduced.
To put it simply: the ordinary motor that you usually see, after power off, it will turn for another moment because of its own inertia, and then stop. The servo motor and the stepper motor stop and stop, and walk away, the reaction is extremely fast. However, stepper motors have lost synchronization.
There are too many applications for servo motors. As long as there is a power source, and the accuracy requirements are generally involved in the servo motor. Such as machine tools, printing equipment, packaging equipment, textile equipment, laser processing equipment, robots, automated production lines and other equipment that require relatively high process precision, processing efficiency and operational reliability.
main effect1. The servo motor is used inside the closed ring. That is to say, it transmits the signal to the system at any time, and at the same time, the signal given by the system is used to correct its operation.
2. The servo motor can also be controlled by a single chip microcomputer.
How much is the general servo motor?The size of the motor is not the same, the parts used are different, the price is not the same, generally about 5KW, the price is 4,000 yuan, 20KW or so, about 7,000 to 10,000 yuan, the price difference will be very large, some manufacturers have government subsidies, It will cost 1,000 yuan a piece, and a small micro-motor will cost a few hundred yuan.
The Panasonic servo motor is an engine that controls the operation of mechanical components in a servo system. It is a supplementary motor indirect transmission. Control speed and position accuracy are very accurate. The voltage signal is converted to torque and speed to drive the control object.
Panasonic servo motor works1. The servo is mainly positioned by pulse. Basically, it can be understood that when the servo motor receives one pulse, it will rotate the angle corresponding to one pulse to realize the displacement. Because the servo motor itself has the function of emitting pulses, the servo Each time the motor rotates by an angle, a corresponding number of pulses are emitted, so that it responds to the pulse received by the servo motor, or called a closed loop. In this way, the system knows how many pulses are sent to the servo motor, and how much is received. The pulse is returned, so that the rotation of the motor can be controlled very accurately, so that precise positioning can be achieved, which can reach 0.001 mm.
2. 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 a large power. High inertia, the highest rotational speed is low, and it decreases rapidly as power increases. Therefore, it is suitable for applications with low speed and smooth operation.
3. The rotor inside the servo motor is a permanent magnet. The U/V/W three-phase electric motor controlled by the driver forms an electromagnetic field. The rotor rotates under the action of the magnetic field. At the same time, the encoder feedback signal from the motor is supplied to the driver. The driver is based on the feedback value. Compare the target value and adjust the angle of the rotor rotation. The accuracy of the servo motor is determined by the accuracy (number of lines) of the encoder.
1, no brush and commutator, so reliable work, low maintenance and maintenance requirements.
2. The stator winding heat dissipation is convenient.
3, small inertia, easy to improve the speed of the system.
4, adapted to high speed and large torque working conditions.
5. It has a small volume and weight under the same power.
The basic method of purchasing Panasonic servo motor1. According to your actual situation, choose a suitable Panasonic servo motor.
2. According to your requirements for the product, choose the Panasonic servo motor specifications and models. Panasonic servo motor specifications and models are mainly as follows:
3. According to the above, according to the technical and economic indicators such as price, weight and volume, purchase the most suitable Panasonic servo motor. The specific calculation method is as follows;
a. Calculate the load inertia and the inertia match. The Japanese loyalty Panasonic servo motor is in the column. The inertia of some products can be matched up to 50 times, but the actual smaller the better, so the accuracy and response speed are good.
b. Calculation of load torque on the motor shaft and calculation of acceleration and deceleration torque.
c. Confirmation of speed and encoder resolution.
d. Calculation and selection of regenerative resistors. For servos, generally 2kw or more, it must be configured externally.
Panasonic servo motor purchase considerations1. For linear motion speed v(t), acceleration a(t) and required external force F(t), for angular motion (t), angular acceleration (t) and required torque T(t) for rotational motion They can all be expressed as a function of time, independent of other factors.
2, the maximum power of the motor P motor, the maximum should be greater than the peak power P peak required for the workload, but this is not enough, the physical power includes torque and speed, but in the actual transmission mechanism they are Restricted.
3. With peak value, T peak indicates maximum value or peak value. The maximum speed of the motor determines the upper limit of the reduction ratio of the reducer. n upper limit = peak value, maximum / peak value. Similarly, the maximum torque of the motor determines the lower limit of the reduction ratio. The lower limit of n = T peak / T motor, the maximum, if the lower limit of n is greater than n upper limit, the selected motor is not suitable.
4. Determine the range of possible transmission ratios between the upper and lower limits by a broad analogy for each type of motor. The principle of using only peak power as the motor of choice is not sufficient, and the accurate calculation of the gear ratio is very cumbersome.
Panasonic servo motor price list (for reference only)Here is the price of the Panasonic servo motor found in Alibaba:
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