General frequency converter torque lifting system and method
A technology of torque boosting and frequency converter, which is applied in control system, vector control system, control electromechanical brake, etc. It can solve problems such as complex calculation, prone to over-compensation and under-compensation, and difficult to realize
Active Publication Date: 2012-10-24
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology
[0010] The technical problem to be solved by the present invention is to provide a general-purpose inverter torque boosting method for the above-mentioned problems that the method of compensating the stator voltage drop when increasing the starting torque of the inverter is difficult to implement, the calculation is complicated, and overcompensation and undercompensation are prone to occur. System and method
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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0046] Such as figure 1 As shown, it is a schematic diagram of an embodiment of the general frequency converter torque boosting system of the present invention. In this embodiment, the torque boost system includes a voltage drop compensation unit 15 , a reference voltage acquisition unit 12 , a current sampling unit 11 , a complementary angle calculation unit 13 and a compensation voltage calculation unit 14 . Each of the above units can be realized by software integrated into the frequency converter control device, or by a device independent of the frequency converter.
[0047] The reference vol...
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The invention provides a general frequency converter torque lifting system. The general frequency converter torque lifting system comprises a pressure drop compensation unit, a reference voltage acquiring unit, a current sampling unit, a complement angle calculating unit and a compensation voltage calculating unit, wherein the pressure drop compensation unit is used for compensating stator pressure drop by using a compensation voltage value Vb; the reference voltage acquiring unit is used for acquiring reference output voltage Ex1; the current sampling unit is used for sampling motor phase current; the complement angle calculating unit is used for calculating a complement angle thetaErr of the included angle between back electromotive force and current; and the compensation voltage calculating unit is used for calculating a compensation voltage value Vb. The invention also provides a corresponding torque lifting method. By utilizing the system and the method, the input current is sampled, an accurate voltage compensation value is acquired by utilizing the triangle relation between the input voltage and the input current, and the stator pressure drop is compensated by using the compensation value so as to keep constant magnetic flux during the speed regulation of a stator.
Description
technical field [0001] The invention relates to the field of motor control, and more specifically relates to a general frequency converter torque boosting system and method. Background technique [0002] The VVVF (Variable Voltage Variable Frequency) control technology of the general-purpose inverter has the advantages of less dependence on motor parameters, simple operation, reliability, and low cost, and has been widely used in the field of AC drives. However, when the motor speed is adjusted, if the magnetic flux is too weak, the iron core of the motor cannot be fully utilized, resulting in waste; if the magnetic flux is large, the iron core will be saturated, resulting in excessive excitation current, and in severe cases, the winding will overheat and damage the motor. Therefore, the key to realize speed regulation of induction motor is to maintain the magnetic flux Φ of each pole in the motor m The rated value remains unchanged. [0003] The effective value of the el...
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Login to View More IPC IPC(8): H02P27/04H02P21/14H02P21/34
Inventor 陈自强
Owner SUZHOU INOVANCE TECH CO LTD