Q:What is the difference between ac servo motor and three-phase ac asynchronous motor?

Different control accuracy Two-phase hybrid stepper motor step Angle is 3.6 ° and 1.8 °, 5 phase hybrid stepping motors interval Angle is 0.72 ° and 0.36 ° in general. There are also some high performance steps in the step of the motor. Such as cross company produces a kind of stepping motor for wire walking machine, where the step Angle is 0.09 °. BERGER LAHR company in Germany (BERGER LAHR) production of three-phase hybrid stepping motor where the step Angle can dial the code switch is set to 1.8 ° and 0.9 ° and 0.72 ° and 0.36 ° and 0.18 ° and 0.09 ° and 0.072 ° and 0.036 °, combine the two and five phase hybrid stepper motor step Angle. The control accuracy of ac servo motor is guaranteed by rotating encoder on the back end of the motor shaft. Panasonic digital ac servo motor, for example, in line with standard 2500 encoder of the motor, drive due to the internal used four frequency multiplication technology, the pulse equivalent to 360 ° / 10000 = 0.036 °. For with 17 encoder of the motor, drive each receive 217 = 131072 pulse motor turns a circle, namely the pulse equivalent to 360 ° / 131072 = 9.89 seconds. Interval Angle is 1.8 ° is 1/655 of the pulse equivalent of stepper motor.

Q:The difference between dc motor and ac motor

Different speed control accuracy: Dc speed control does not change the load properties of the motor, and ac speed change the property of load. In other words, the frequency of the alternator is different. The resistance of the dc motor is constant while the voltage is different. Ac speed adjustment, due to unstable, it is difficult to realize fine speed adjustment. Dc speed adjustment, due to stability, it is easy to achieve fine speed adjustment, and several millivolt speed can be resolved.

Q:Single phase synchronous alternator working principle

Without dc voltage on the brush, constant speed by prime mover drag the armature to counterclockwise rotation, on both sides of the coil is cutting lines of magnetic force under different magnetic polarity, respectively, in which the induction electromotive force, electromotive force direction determined by the right-hand rule. This electromagnetic situation is shown on the graph. Due to the armature rotate continuously, and, therefore, must take the current carrying conductor in magnetic field from the coil side ab and CD alternately cutting lines under the N pole and S pole, although each side of coil and the coil in the direction of induction electromotive force is alternating. Induction electromotive force in the coil is A kind of alternating electromotive force, and in the brush. A, B side electromotive force for dc electromotive force (some say exactly, is A kind of direction invariable pulse vibration electromotive force). Because, the armature in the rotation process, no matter the armature turn to what position, due to the effect of the reversing of the commutator with brush, brush A by commutator segment of electromotive force always is the cutting edge of electromotive force by the coil in N pole magnetic field lines, therefore, brush A always have A positive polarity. In the same way, the brush B has always negative polarity, so the brush can lead to the same change in the direction of the pulse. If the number of coils per pole increases, the pulse vibration decreases, and the dc electromotive force can be obtained. That's how the dc generator works. It also shows that the zidc generator is essentially an ac generator with a commutator.

Q:Is the servo motor a dc motor or ac motor?

What is a step motor? A step motor is an actuator that converts electrical impulses into angular displacement. Popular point: when the stepper driver receives a pulse signal, it is driving a stepper motor according to set the direction of a fixed Angle (and the step Angle). You can control the amount of angular displacement by controlling the number of pulses, so that the target is accurate. At the same time, you can control the speed and acceleration of the motor by controlling the pulse frequency. There are three types of steps: permanent magnetic (PM), reactive (VR) and hybrid (HB). The permanent magnet step is generally two phases, the torque and volume are small, the step Angle is usually 7.5 degrees or 15 degrees. The reaction type step is generally three-phase, can realize the big torque output, the step Angle usually is 1.5 degrees, but the noise and vibration are very large. Developed countries such as the United States and Europe were eliminated in the 1980s. Hybrid step refers to the advantage of mixing permanent magnet and reactive type. It is divided into two phases and five phases: the Angle of two phases is 1.8 degrees and the Angle is 0.72 degrees. This step is the most widely used.

Q:Is it still a communication welder

Of course the ac welder was used in sales; And it's not too small; But today's ac welders are mainly concentrated in high-power welders;

Q:How does the three-phase ac motor identify the phase

What you're talking about is the traditional start of the de-stress In fact, there is a soft start and frequency converter

Q:The three-phase ac motor can be divided into which classes

At the speed of operation The three-phase asynchronous motor is divided into high speed motor, low speed motor, constant speed motor and speed regulating motor. Low speed motor is divided into gear reduction motor, electromagnetic deceleration motor, torque motor and claw pole synchronous motor. 6, according to structure and principle of work According to the structure and principle of the motor, it can be divided into dc motor, asynchronous motor and synchronous motor.

Q:What is the difference between dc brushless motor and dc brushmotor?

No carbon brush, need drive electron commutation, have the brush structure is the stator magnet, the rotor coil, no brush on the other side, have uvw three, is ac motor winding

Q:Why should ac motors be used in parallel with capacitors

A capacitor is usually a single phase, or 220V motor. The capacitors it takes are usually strung together in so-called starting coils, not in parallel. You know that in a three-phase machine, you have three phase electrical connections, so you have a rotating magnetic field. This magnetic field drives the rotor. There is only one phase of the single phase motor. If a single phase motor does not start the coils and start the capacitance, it will not be able to form a rotating field with a single phase connected motor.

Q:Calculation method of motor torque

The relation between power, speed and torque is not related to motor form. All the rotating machines are the same. The formula is P = T * n / 9550, P is power, unit KW, T is torque, unit N.m, n is RPM, unit RPM. Different types of motors have different output characteristics, and there is no way to do the exact equivalent, mainly for use.