The speed regulating motor is a kind of motor that changes the speed of the motor by changing the number of stages, voltage, current, frequency, etc. of the motor to make the motor reach higher performance. But do you know the speed control method of the speed control motor? Dalan Motor will tell you! 1. Electromagnetic speed regulation The electromagnetic speed regulation motor consists of a cage motor, an electromagnetic slip clutch and a DC excitation power supply (controller). The DC excitation power supply is small, usually composed of a single-phase half-wave or full-wave thyristor rectifier. Changing the conduction angle of the thyristor can change the magnitude of the excitation current. The electromagnetic slip clutch is composed of three parts: an armature, a magnetic pole and a field winding. The armature and the latter have no mechanical connection and are free to rotate. The armature and the rotor of the motor are coaxially coupled to the active part, which is driven by the motor; the pole of the magnetic pole is connected to the load shaft and is called the driven part. When both the armature and the magnetic pole are stationary, if the field winding is DC-connected, a plurality of pairs of N and S poles will be formed along the circumferential surface of the air gap, and the magnetic flux passes through the armature. When the armature rotates with the drag motor, the armature induces a vortex due to the relative movement between the armature and the magnetic pole. The eddy current interacts with the magnetic flux to generate a torque, and the rotor with the magnetic pole rotates in the same direction, but The rotation speed is lower than the rotation speed N1 of the armature. This is a slip speed regulation method. By changing the DC excitation current of the slip clutch, the output torque and the rotation speed of the clutch can be changed. The method is suitable for production machines with medium and small power, requiring flat sliding and short time and low speed operation. 2, the pole-to-pole logarithmic speed-changing logarithmic speed regulation is to change the stator winding wiring mode to change the stator pole number of the cage motor to achieve the purpose of speed regulation, the method is suitable for production machinery that does not require stepless speed regulation, Such as elevators, lifting equipment, fans, pumps, etc. 3. Frequency control The frequency conversion speed regulation is a speed control method that changes the frequency of the motor stator power supply and changes its synchronous speed. The main equipment is a frequency converter that provides variable frequency power. The frequency converter can be divided into AC-DC-AC inverter and AC-AC inverter. At present, most of the domestic use AC-DC-AC inverter. The method is suitable for occasions requiring high precision and good speed regulation performance. 4. Cascade speed regulation Cascade speed regulation refers to the addition of an adjustable additional potential in the rotor circuit of the wound-type motor to change the slip of the motor and achieve the purpose of speed regulation. Most of the slip power is absorbed by the added additional potential, which is then used to generate additional means to return the absorbed slip power back to the grid or to convert energy for use. According to the slip power absorption and utilization mode, the cascade speed regulation can be divided into the motor cascade speed regulation, the mechanical cascade speed regulation and the thyristor cascade speed regulation mode, and the thyristor cascade speed regulation is often adopted. The method is suitable for use on fans, water pumps and rolling mills, mine hoists and extruders. 5. The wound-type speed-regulated wound-type asynchronous motor rotor is inserted into the additional resistor to increase the slip of the motor and the motor runs at a lower speed. The greater the resistance in series, the lower the speed of the motor. The method is simple in equipment and convenient in control, but the slip power is consumed in the form of heat on the resistor. It has a graded speed regulation and soft mechanical characteristics. 6. Voltage regulation When changing the stator voltage of the motor, a different set of mechanical characteristic curves can be obtained to obtain different speeds. Since the torque of the motor is proportional to the square of the voltage, the maximum torque drops a lot, and the speed adjustment range is small, making the general cage motor difficult to apply. In order to expand the speed regulation range, the voltage regulation speed regulation should use a cage motor with a large rotor resistance value, such as a torque motor for voltage regulation and speed regulation, or a series frequency sensitive resistor on a wound motor. In order to expand the stable operating range, when the speed regulation is above 2:1, feedback control should be adopted to achieve the purpose of automatically adjusting the speed. The main device for voltage regulation and speed regulation is a power supply that can provide voltage change. Commonly used voltage regulation methods include series saturation reactor, autotransformer and thyristor voltage regulation. The thyristor voltage regulation method is optimal. The pressure regulation speed is generally applicable to production machines below 100KW. 7. Coupler Speed ​​Control The fluid coupler is a hydraulic transmission device. It is generally composed of a pump wheel and a turbine. They are collectively referred to as a working wheel and are placed in a sealed housing. The shell is filled with a certain amount of working liquid. When the pump wheel rotates under the driving of the prime mover, the liquid in the liquid is pushed by the blade to rotate, and when the centrifugal pump enters the turbine along the outer ring of the pump wheel, it is given on the same steering. The turbine blades are thrust to drive the production machinery. The power transfer capacity of the fluid coupler is consistent with the relative amount of liquid in the shell. In the working process, changing the liquid filling rate can change the turbine speed of the coupler and make stepless speed regulation. This method is suitable for speed regulation of fans and pumps. ----- Responsible Editor: Dalan Oil Pump Motor 02- Purchasing Consultant Copyright http:/(Dalan Motor) Reprint, please indicate the source http://news.chinawj.com.cn
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