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Selection of motor voltage and speed

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.

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Operating characteristics of three-phase asynchronous motors

Operating characteristics of three-phase asynchronous motors

The working characteristics of three-phase asynchronous motors The working characteristics of asynchronous motors refer to the relationship between the rotation speed N, stator current I1, power factor cosφ1, electromagnetic torque T, efficiency η, etc. of the motor and the output power P2 under the condition of rated voltage and rated frequency operation, I .e. when U1 = UN,f = fN, n, I1, cosφ1, t, n = f(P2). Since the asynchronous motor is an AC motor, it is necessary to consider the power factor for the power grid. At the same time, due to the unilateral excitation, the excitation current and the load current coexist in the stator winding, so the stator current should be paid attention.

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