Abstract
This study aims to realize a tactile display which can represent 2D haptic information on the display surface. The display consists of many compact actuation systems whose position and force can be controlled. In our previous works, sensorless motion control for a compact solenoid actuator has been proposed to realize the compact actuation system. Additionally, we have proposed sensorless control method for a dual solenoid actuator (DSA) to improve the control performance. However, the proposed DSA system has a few problems such as large body, large mover mass, and large friction force. In order to solve these problems, this paper proposes a new compact dual solenoid actuator (CDSA). The proposed actuator has less number of coil turns, therefore much current is required to generate large magnetic force. On the other hand, the large current generates large thermal energy which causes change of the inductance characteristics of the dual coils. The sensorless position estimation is conducted using the relation between the mover position and the inductance. Therefore, thermal compensation method for the new CDSA is also proposed in this paper. Experiments were conducted to validate the proposal. As a result, the sensorless position estimation with less than 60μm estimation error was achieved.
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