A Sensorless PMDC Motor Speed Controller with a Logical Overcurrent Protection

Abstract

A method to control the speed or the torque of a permanent-magnet direct current motor is presented. The rotor speed and the external torque estimation are simultaneously provided by appropriate observers. The sensorless control scheme is based on current measurement and switching states of power devices. The observers performances are dependent on the accurate machine parameters knowledge. Sliding mode control approach was adopted for drive control, providing the suitable switching states to the chopper power devices. Despite the predictable chattering, a convenient first order switching function was considered enough to define the sliding surface and to correspond with the desired control specifications and drive performance. The experimental implementation was supported on a single dsPIC and the controller includes a logic overcurrent protection.

Finite Control Set Model Predictive Speed Control of a DC Motor

“…KF proposed here is based on the predictor-corrector form [16]. It is assumed that state variables are excited by random disturbances (e.g., inaccurately modeled dynamics), and so we consider the sampled-data model (7) and (8) in the presence of noise as follows:…”

“…The PMDC machines have been extensively studied and many advanced control strategies have been presented in the past, but they are studied by many researchers even today [1][2][3][4][5][6][7]. Among the new approaches, a new and attractive alternative for the control of H-bridge supplied PMDC machine is finite control set model predictive control (FCS-MPC) [8].…”

Road motion control electric vehicle with speed and torque observer

“…The difference between the angular speeds of the wheel drives is express by equation (13). The signal of the steering angle indicates the curve direction (14). The simulation results of the described system were obtained from the block diagram represented in fig.…”

“…The speed and external torque observers are based on the armature voltage and current measurement [14]. Let be x the vector to be observed and x the corresponding estimative value, so:…”

Analysis and Simulation of Speed Control in DC Motor Drive By Using Fuzzy Control Based on Model Reference Adaptive Control

“…Thus there is a large tendency and effort to develop the control tool of it [8,9]. In industrial drives and dc motor control, three methods are common [10][11][12][13][14][15][16][17][18][19][20]: 1) a classic method is employment of PI and PID controllers which is not flexible for system parameters change, so it provides many limits and problems. 2) adaptive control methods that are more sophisticated than the classic method, commonly, sudden disturbance and changes in driving motor exist that because we couldn't get a complete and stable design for system.…”