| Along with the development of magnetic force insulate vibration technology, electromagnetic active seat suspension was bringing abroad attention with the excellent characteristics such as nonlinear, no contact, pollution-free etc. This paper has developed an electromagnetic actuator using in active seat suspension and a control unit. The finished work and achieved results are generalized as follows:1. A new structure of electromagnetic actuator has been brought forward based on the characteristics of seat suspension. This electromagnetic actuator is made up of two vertical collocation magnets, and was columned. Established the simulation model of the electromagnetic actuator in the ANSYS Emag. module and researched the magnetic characteristic as changing the parameters of electromagnetic actuator such as the core's diameter, core's length, winging number N, winding current I and air gapδ. Analyzed the effect of electromagnetic field distributing and magnitude on the parameters. Simulation results showed that when the winding of electromagnetic actuator has current, the magnetic field distributing was symmetrical ultimately, the flux of core and gag bit were most. In the range of researched parameters, the electromagnetic force of gag bit increased with the core diameter, decreased with the core length. On the same condition, the electromagnetic fore increased with the number of windings. the electromagnetic force of gag bit relates with the current of winding and the air gap, the electromagnetic increased with the current nonlinearly, decreased with the air gap nonlinearly.2. Based on the simulation results, the parameters of the electromagnetic actuator were confirmed, and it was produced. Experiment researched the electromagnetic actuator with single frequency excitation. Study the relation of vertical acceleration and excite frequency as the different winding current. Experiment results show that the vertical acceleration was increased firstly and decreased along with the excite frequency when the current of electromagnetic actuator was invariable. When the frequency was 4-6Hz, the acceleration achieves the peak value. when the below winding current was invariable, but the above winding current was variable, the acceleration was almost unchanging when the frequency was less than 4Hz, and the acceleration increased with current when the frequency was more than 4Hz. This showed adjusting the current of the electromagnetic actuator can change the vibration capability of electromagnetic actuator.3. Constructed the hardware and software system of the control unit. Design a power transform implement which can adjust the current continuously and availably. Developed the controller with a core of DSPIC30F2010, and its periphery circuit contained the signal collection and transact circuit such as vertical acceleration, power voltage, winding current, switching power supply, IGBT drive circuit, communicate interface. Considering the system's expansibility and universal, the applicability of the hardware system was boost up in designing periphery circuit. Using the C language compile the control program, under the request of credibility and practicality, demand to realize functions such as the collection and transact of the input signals, realization of the control arithmetic, the output of the control signal ,the display of the key parameters and so on. Considering the complexity of the application locale, design the anti-jamming of the system's hardware and software.4. Through the single frequency excite experiment research, compared the vibration effect between uncontrolled and controlled electromagnetic actuator. With the analysis of the control system's work status and the experiment result, the control unit can work steadily and reliably, the controlled vibration result is more effective than the uncontrolled.This paper was expected to build theoretical and experimental support for the electromagnetic actuator of the active seat suspension and the control system.
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