The basic content required for motor selection includes: the type of load to be driven, rated power, rated voltage, and rated speed.
The advantage of the DC motor produced by Sima Motor Factory is that it can easily adjust the speed by changing the voltage and can provide a larger torque. It is suitable for loads that need to adjust the speed frequently, such as rolling mills in steel mills, hoists in mines, etc. But now with the development of frequency conversion technology, AC motors can also adjust the speed by changing the frequency. However, although the price of variable frequency motors is not much more expensive than ordinary motors, the price of frequency converters occupies the main part of the whole set of equipment, so there is another advantage of DC motors that they are cheap.
The shortcoming of the flow motor is that the structure is complex, any equipment as long as the structure is complex, will inevitably lead to an increase in the failure rate. Compared with AC motors, DC motors have complicated windings (excitation windings, commutating pole windings, compensation windings, armature windings), but also add slip rings, brushes and commutators. Not only the manufacturer's process requirements are high, but the subsequent maintenance costs are also relatively high. Therefore, DC motors are in an embarrassing situation in industrial applications where they are gradually declining but are still useful in the transitional stage.
Generally speaking, the motor can be roughly determined by providing the type of load driven, the rated power of the motor, the rated voltage, and the rated speed. But if the load requirements are to be optimally met, these basic parameters are far from enough. The parameters that need to be provided include: frequency, working system, overload requirements, insulation level, protection level, moment of inertia, load resistance torque curve, installation method, ambient temperature, altitude, outdoor requirements, etc., which are provided according to specific conditions.
Although DC motors are inferior to the high-efficiency and energy-saving motors developed today in terms of energy saving and environmental protection, many large state-owned enterprises are still widely using them due to the early stages of industrial development.
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