Total pressure starting, also known as direct starting, it is the most common way of starting, it is the brushless motor stator winding is directly connected to the power supply, under the rated voltage, starting with the characteristics of large starting torque, starting time is short, also is the simplest and the most economic and reliable way of starting.
ac brushless motor starting, the power distribution busbar voltage shall meet the following requirements:
delta in the general case, frequent starting motor, should not be less than 90% of the rated voltage value; Motor is not frequent starting, should not be less than 85% of the rated voltage.
delta distribution bus did not pick up on other electric equipment, according to the condition of starting torque of motor,For low voltage motor, but also should guarantee the contactor coil voltage not under voltage release.
delta distribution bus by lighting or other load are sensitive to voltage fluctuation, infrequent and motor starting, shall not be less than 80% of the rated voltage.
cage type motor and the choice of the ways of brushless synchronous motor starting, shall meet the following requirements:
delta when meet the following conditions, the motor should be full pressure start
when the motor starting, the power distribution busbar voltage should comply with the 'general electric equipment distribution design standard' regulation.
pieces mechanical energy to withstand the impact of the full pressure starting torque.
mixer factory no special provisions for motor starting ways.
delta when does not meet the requirements for the full pressure start, electric made step-down starting, or choose other appropriate way of starting.
delta when speed control requirements, the way of starting motor should be made to match the speed adjustment way.
total pressure motor start the advantages and disadvantages of
total pressure starting is a common way of starting, also known as direct starting. It is the motor stator winding is directly connected to the power supply under the rated voltage starting, has a large starting torque, starting time is short, the characteristics of is simple, economic and reliable way of starting. At present the design and manufacture of low-voltage squirrel-cage motor according to the pressure of the impact of the starting torque and the hot condition to consider its mechanical strength and thermal stability, so as long as being dragged the equipment to withstand the impact pressure of the impact of the starting torque, starting pressure drop is less than the allowable values, you should choose the starting way.
total pressure starting disadvantage is that the starting current is big, can reach 5 ~ 8 times the rated current, the bigger brushless motor power and power supply capacity of the smaller cases, the starting current of the motor will cause a significant reduction in the voltage of power distribution system, which reduces the power supply quality, especially for voltage fluctuation sensitive equipment.
