In Figure 4-15, curve 1 represents the U/f characteristic of the motor when low-frequency compensation is applied while driving the LXT905LC dynamic constant torque load. Curve 2 shows the U/f characteristic without low-frequency compensation under the same constant torque load condition. Curve 3 illustrates the U/f curve with low-frequency compensation when the motor is driving a water pump fan load, and curve 4 depicts the U/f curve without low-frequency compensation for the same type of load. These curves demonstrate how different load types affect the voltage-to-frequency relationship during motor operation.
As shown in Figure 4-15, it is also evident that once the motor reaches its rated voltage, the inverter cannot increase the output voltage beyond this point. Therefore, above the base frequency (f_i), the output voltage (U) remains at the rated level, resulting in a horizontal line on the U/f curve. This change affects the magnetic flux according to equation (4-4). As the frequency increases, the magnetic flux decreases, leading to reduced torque. Consequently, the motor transitions into a constant power speed control mode. For example, when maintaining a constant voltage (U = fixed value), the magnetic flux variation is more pronounced, as illustrated in Figure 4-16.
In Figure 4-16, curve 2 represents the U/f characteristic without low-frequency compensation when the motor is driving a constant torque load, while curve 1 shows the corresponding flux variation. Below the base frequency (f_i), the flux remains constant, which corresponds to the constant torque speed control mode. However, when the frequency exceeds f_i, the flux decreases, and the flux variation follows an inverse relationship, representing the constant power speed control mode. Curve 4 illustrates the U/f curve without low-frequency compensation when the motor is driving a square torque load, and curve 3 reflects the corresponding flux variation. Below f_i, this corresponds to the square torque speed control mode, while above f_i, the flux again follows an inverse relationship, indicating constant power speed regulation.
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