Research on the positioning control of asynchronous motor - brake physical process

 Stator winding from three-phase power disconnected,bubbled into direct current,the stator magnetic field from the rotating state into a fixed position,same size constant magnetic field,because of diesel generating the influence of the mechanical inertia,rotor is rotating in a clockwise direction,the rotor conductor cutting constant magnetic field.Due to the cutting direction,asynchronous motor in contrast to the state of electric,so the rotor induction electric potential and the direction of the induced current,also in contrast to the state of electric,cause the torque of the motor reverse,counterclockwise.M torque and rotational speed n direction on the contrary,as the braking state,the asynchronous motor's kinetic energy into electrical energy,consumption on the motor rotor resistance of the circuit,so that braking energy.

The torque of the motor and load torque,under the electrical motor joint action of slow down soon.When rotation speed is equal to zero,the rotor conductors are no longer cutting magnetic field,rotor induction electric potential and induced current reduce to zero,the motor is no longer produce electromagnetic torque,which can control the production of mechanical parking.Analysis was conducted based on Xm = constant conditions.In the process of braking energy excitation reactance Xm is not constant.But due to the change of Xm for motor operation effect is not big,so think Xm is constant in the theoretical analysis.Using energy consumption braking,both must have bigger brake torque,and acmotortrading.blogspot.com don't make,rotor loop current is too large,the connection mode is shown in figure 3,determine the following relation can be used asynchronous motor stator dc excitation current I_ and rotor circuit of series resistance R Ω.

Generator excitation current of several ways

1, dc generator excitation power supply: this way of excitation generator has a dedicated dc generator, the dedicated dc generator said For the dc exciter, exciter is general and coaxial generators, generator exciting winding through perfectly on the large axial slip ring and fixed brush from the exciter Dc current. This way of electric vehicle motor field independent excitation current, more reliable and decrease for electricity consumption, etc, is in the past few decades Generator main excitation mode and has a mature operating experience. Defect is excitation regulating speed slower, maintenance workload is big, so in more than 10 mw The crew are rarely used. 2, ac exciter power supply mode of excitation, some use ac exciter provides modern large capacity generator excitation current. Ac exciter Installed on the generator shaft, its output of alternating current flows through the rectifier supply generator rotor excitation, at this point, the generator excitation way his wound Magnetic way, and with the stillness of wholesalemotor.blogspot.com the rectifying device, so it is also called separately excited static excitation, exchange exciter provides exciting current. Deputy excitation communication Magnetic machine can be permanent magnet machine with self-excitation constant pressure device or alternator. In order to improve the excitation regulating speed, ac exciter is usually adopted 100-200 hz frequency generator and the ac exciter are using 400-500 hz frequency generator. The motor fan dc excitation winding of generator Group and the three-phase ac winding around the stator slot, the rotor teeth and slots without winding, like a gear, therefore, it has no brush and slip ring Turn the contact parts, with reliable work, simple structure, convenient manufacturing process. The disadvantage is that the noise is bigger, ac voltage harmonic Component is bigger also.

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