Censored method based on switched reluctance motor

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Censored method based on switched reluctance motor drive system reliability analysis

Chart difficult start), in order to not start when starting difficulties, should have a minimum starting the starting current. Minimum starting current from (1) to determine: where: J is the minimum starting current; as the load torque; as starting torque ratio; J is the motor stall current. Uo is based on the initial current and voltage of the initial moment of the initial decision. Soft-start routine is determined by the operation program, the size of the output control voltage process. First to start the motor, must overcome the load torque; Second, we must meet certain starting current, the two factors is given initial voltage U. , The slope of the size of the voltage rise is determined by the starting time, and is in accordance with the time interval to send a progressive cycle control voltage, until the end of the last start, send full voltage, power supply machine running. The control voltage changes the size of the final analysis, by controlling the firing angle a to achieve. The design of the system control to control the angle of roughly be divided into four stages: (1) to find the fixed starting phase of a control angle. The process at this stage, the control settings from the initial starting angle, decreases rapidly until a (��, when the control angle of the motor stator current is just not more than the starting current value), this period is very short. Control angle a corresponding voltage is U. . (2) control angle a fixed stage. In this process (starting the beginning), a smaller change in the power factor, so if you control the angle does not change,[link widoczny dla zalogowanych], the current continuity will not change much,[link widoczny dla zalogowanych], the motor stator voltage, current, average torque output is essentially unchanged, so the torque can be increased linearly. (3) by step phase-shifting stage. Late in the second phase of the power factor is rapidly increasing,[link widoczny dla zalogowanych], the electromagnetic torque under the same conditions,[link widoczny dla zalogowanych], the rotor current will decrease rapidly, and the corresponding stator current will drop,[link widoczny dla zalogowanych], and the decrease is increasing. To take full advantage of starting the process of limiting the space to ensure that the stator current does not exceed the limits of the premise, if you want to get the most torque of the motor to start the process completed as quickly as possible, you can set the increment step �� a. (4) phase transition stage. Close to synchronous speed in a suitable time, the control angle a push to the pre-set minimum control angle (the minimum control angle and the power factor related), the motor running at full pressure to complete the starting process. 4 Conclusion The author of the developed soft starter in the production is completed, the system through the debug test hardware and software solutions to improve and complete soft starter designed to bring the actual three-phase asynchronous motor starting load, measured experiment had data and waveform. The designed system can set different required starting voltage and starting time to complete motor soft start. Mouth