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Selection of motor voltage and speed
The rated speed of the motor is selected according to the requirements of the production machinery. When determining the rated speed of the motor, the transmission ratio of the mechanical deceleration mechanism must be considered. The two cooperate with each other and can be determined through a comprehensive comparison of technology and economy. Generally, the motor speed is not less than 500r/min, because when the power is constant, the lower the motor speed, the larger its size, the more expensive, and the lower the efficiency. If you choose a high-speed motor, it is bound to increase the mechanical deceleration mechanism The transmission ratio of the machine makes the mechanical transmission part complicated.
The rated speed of the motor is selected according to the requirements of the production machinery. When determining the rated speed of the motor, the transmission ratio of the mechanical deceleration mechanism must be considered. The two cooperate with each other and can be determined through a comprehensive comparison of technology and economy. Generally, the motor speed is not less than 500r/min, because when the power is constant, the lower the motor speed, the larger its size, the more expensive, and the lower the efficiency. If you choose a high-speed motor, it is bound to increase the mechanical deceleration mechanism The transmission ratio of the machine makes the mechanical transmission part complicated.
For some high-speed and medium-speed machines that do not need speed regulation, such as water pumps, blowers, air compressors, etc., motors with corresponding speeds can be used to drive directly without mechanical deceleration mechanisms. For machinery requiring speed regulation, the maximum speed of the motor should be adapted to the speed of the production machinery. If the use of DC variable speed motor to change the excitation, in order to make full use of the motor capacity, should be selected to adjust the magnetic speed of the base speed. Another example is some steel rolling machinery, etc., the working speed is low, often in frequent positive and reverse operation state, in order to shorten the positive and reverse transition time, improve production efficiency, reduce consumption, and reduce noise, save investment, select the appropriate Low-speed motor, the use of direct transmission without reducer is more reasonable.
For intermittent cycle working machines that require fast and frequent starting and braking, usually when the product of the moment of inertia of the motor rotor and the square of the rated speed is the minimum, the fastest starting and braking effect can be obtained.
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