Siemens Original Reducer

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Q:What does the D axis and the Q axis mean for AC induction motors?
The D axis and the Q axis represent the direct axis and communicate. By decomposing the stator current into the direct axis component and the quadrature axis component, the armature responses are calculated respectively so as to better control the stator currents.In permanent magnet synchronous motor control, in order to obtain similar control characteristics of DC motor,
Q:Why should a single-phase AC motor start with a capacitor?
Because only the formation of a rotating magnetic field, the squirrel cage rotor will rotate, only increase the starting winding, but start winding must be shifted to start capacitor winding current advance main coil current of 90 degrees, the rotating magnetic field motor to rotate (motor power will start after the resection of the starting capacitor).
Q:The difference between three-phase AC synchronous motor and three-phase AC asynchronous motor
Asynchronous motor is stator into alternating current, to produce a rotating magnetic field, and the rotor is produced by induction and magnetic field, so that the two magnetic field, so that the rotor rotates the rotating magnetic field of stator and rotor. The stator rotating magnetic field than a slow slip, not synchronous so called asynchronous machine.The rotor of a synchronous motor is a constant magnetic field which is added by the man to the direct current, so that the rotor is synchronized with the rotating magnetic field of the stator, and then the synchronous motor is called synchronous motorStructure and principle
Q:How to distinguish AC and DC machines
This also increases the manufacturing cost of DC motors to a certain extent. The alternator is concerned, it can realize direct energy feedback to the grid (but must ensure 4 conditions: the same voltage amplitude, phase and phase sequence of the same, the same frequency); but DC generator power needs to convert AC inverter (DC rectification process called, the direct current into alternating current the process that the inverter can be feedback to the power grid). So it also needs to increase the power of the inverter.
Q:What are the speed regulating methods of AC motors? Detailed point
(1) rotor circuit series resistance: used in AC winding asynchronous motors. The range of speed regulation is small, the resistance consumes power, and the motor efficiency is low. Used of cranes.(2) change the speed of power supply voltage, the speed range is small, the torque decreases greatly with the voltage drop, and the three-phase motor is usually not used. Used for single-phase motor speed regulation, such as fan.(3) cascade speed regulation, in essence, is the introduction of additional rotor electromotive force, change its size to speed. It is also only used in wound motors, but the efficiency is improved.(4) electromagnetic speed regulation. Used only for slip motors. By changing the exciting coil current, stepless smooth speed regulation, the mechanism is simple, but the control power is smaller. Not suitable for long term low speed operation.
Q:The direction of alternating current keeps changing. How about the direction of AC motor?
Three-phase motor to change the phase sequence (any two-phase electrical connection ~ ~ ~ ~ swap position)One way motor changes the direction of main winding or secondary winding in the direction of fire
Q:What is the influence on the motor when AC motor is connected to direct current?.
In the circuit of the home soybean milk machine, there is a rectifier circuit, and the motor is not an AC motor in the sense of pure.48V inverter, which means to convert 48V DC to 220V AC. But you this inverter because it is driven by the inductive load, the nominal power to more than double. Because the household machine (beating) Soybean Milk time is very short, usually in less than 3 minutes, so the motor temperature is relatively high, but can try 2 48V battery series 96V try, but first we must carefully look at the temperature rise of the motor.
Q:How to judge the quality of three-phase AC motor?
First of all, cut off the power supply, hand disk motor rotation, whether there are bearings stuck, rotor sweeping, and other mechanical faults.Remove the motor power line (U1, V1, W1, U2, V2, W2, U1, U2 respectively) measured with a multimeter, V1, V2, W1, W2 resistance, resistance is similar to the normal phase, if the difference is too large winding interturn short circuit, three-phase three-phase (also check the resistance between each other between the infinite resistance is normal) and ground (for housing) resistance.
Q:100W AC motor or DC motor good?
Depending on what you do with the motor, each has its own characteristics,The main difference between AC and DC motors is that the nature of the power supply is different. The AC motor uses alternating current. The generator sends out alternating current, while the direct current motor uses the direct current, and the generator sends out the DC point too
Q:Why is DC motor wider than AC motor? High speed regulation accuracy? How do you know?
The DC motor has the ability to keep the rated torque from the zero speed to the nominal speed, so it can perform stepless speed regulation from zero speed to rated speed (constant torque).

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