Magnetic suspension bearing electric magnetic pole magnetic force control method based on double bridge structure
A magnetic levitation bearing and magnetic control technology, which is applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve problems such as high real-time requirements, bus voltage short-circuit faults, and complex control circuits, etc. Potential for short-circuit faults and reduced on-off loss
Inactive Publication Date: 2016-08-24
XIANGTAN UNIV
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Problems solved by technology
The speed of the magnetic levitation rotor is usually above 10,000 rpm, and the safety requirements are high. However, the working environment of the magnetic levitation bearing will inevitably have electromagnetic pollution. External interference makes the switch tubes Q1 and Q2 tubes conduct at the same time. Instantaneous short circuit fault in voltage
[0009] Magnetic levitation bearings generally have more than 20 inputs and more than 10 outputs, and have high real-time requirements. Currently, the products are implemented with multiple DSP systems, and the control circuits are complicated. For the high switching frequency, low power consumption and High reliability requirements, it is necessary to design a control method for the electromagnetic pole
Method used
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Embodiment 1
[0104] Embodiment 1: as Figure 6 , a method for controlling the magnetic force of magnetic suspension bearing electromagnetic poles based on a double bridge structure, the power supply circuit of the magnetic suspension bearing electromagnetic poles adopts a main circuit with a double bridge structure, and the main circuit includes 2 power switching devices and 2 diodes: the first power a switching device (Q1), a second power switching device (Q2), a first diode (D1) and a second diode (D2);
[0105] The first power switching device and the second diode form a first bridge arm, and the second power switching device and the first diode form a second bridge arm;
[0106] In the first bridge arm, the first terminal of the first power switching device (Q1) is connected to the positive pole of the DC power supply (VDD); the second terminal of the first power switching device is the control terminal, which is connected to the control signal HIN, and the first power The third termi...
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The invention discloses a magnetic suspension bearing electric magnetic pole magnetic force control method based on a double bridge structure. The control method utilizes a main circuit with a double bridge structure, wherein the main circuit includes two power switch devices and 2 diodes: the first power switch device (Q1), the second power switch device (Q2), the first diode (D1) and the second diode (D2); the first power switch device and the second diode form a first bride arm; and the second power switch device and the first diode form a second bridge arm. The magnetic suspension bearing electric magnetic pole magnetic force control method based on a double bridge structure utilizes an FPGA to realize a driving circuit, and has the advantages of being high in safety, being low in loss, and being low in magnetic force pulsation amplitude.
Description
technical field [0001] The present invention relates to a PWM control technology, in particular to a magnetic force control method for an electromagnetic pole of a magnetic suspension bearing, and a current drive control technology for inductive loads. Background technique [0002] Figure 1-2 It is a circuit diagram of an inductive load drive. When the MOSFET switch signal LIN is high, Q2 is turned on, and the bus voltage is loaded on both ends of the electromagnetic pole EMP, resulting in figure 1 The driving current i shown, when LIN is low level, Q2 is closed, and the current i is as figure 2 As shown, the freewheeling through the diode D1 adjusts the magnitude of the current by adjusting the duty ratio of LIN. This control method has high conduction loss, and the switching frequency is restricted by the reverse recovery time of the freewheeling diode D1 and the switching loss. Generally only suitable for low power occasions. [0003] Figure 3-4 A low-voltage and h...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M1/088H02M3/158
CPCH02M1/088H02M3/158H02M1/0012H02M1/0041H02M1/0054H02M1/0064Y02B70/10
Inventor 张义兵刘旺殷理杰
Owner XIANGTAN UNIV