T. Rudnicki

Effective BIST for crosstalk faults in interconnects

The paper is devoted to a test-per-clock method of an length.

Performance analysis of a PMSM drive with torque and speed control

The paper presents performance analysis of a permanent magnet synchronous motor (PMSM) drive with torque and speed control. The PMSM motor requires sinusoidal stator currents to produce constant torque. The paper presents constituents for the mathematical analysis of the motor operation within the dq-axis model. The mathematical model serves as inspiration for development of a drive design based on the DSP processor and IGBT power module. The measurement system consists of a control unit equipped with an inverter and an encoder, the PMSM drive (500W; 5Nm; 800 rpm), a torque measuring device and a motor that work in the generator mode. The performance analysis has been performed in two control intervals. It is possible to operate the PMSM with the speed that exceeds the rated rpm if the permanent-magnet excitation is weakened by a demagnetising field component produced by the stator winding. However, it leads to a decrease of the motor efficiency. The conducted experiments have shown, that in the second control interval it is possible to increase the motor speed by about 30% as compared to the nominal rpm (overspeed).

Impact of PWM control frequency on efficiency of drive with 1 kW permanent magnet synchronous motor

Purpose The paper presents the impact of Pulse Width Modulation (PWM) control frequency for specific Permanent Magnet Synchronous Motors (PMSMs) on the efficiency of the entire driving unit. Examinations were carried out for a PMSM unit with a power of 1 kW, rated speed of 1000 rpm, and rated torque of 6 Nm. Design/methodology/approach The PWM frequency ranged from 4 to 20 kHz with increments of 1 kHz. Measurements were taken for each of the foregoing frequencies, for the different load torques, and for the different rotation speeds including overspeed. The results achieved allow the PWM control frequency to be properly adjusted for each PMSM to operate the entire driving unit in the most efficient way and, in consequence, save energy consumed by the drive. Findings Obtained results may be used as a kind of background for the design of drive system. Research limitations/implications For a specific PMSM-based drive system one can find the optimal PWM control frequency. This frequency depends on the rotatio...

The Virtual Drum Kit

Abstract A virtual drum kit simulator is presented in the paper. The simulator is designed as an embedded system connecting processors, FPGA device and devices enable signal conversion and amplification. A logic device (FPGA) is a central processing unit of a base station. Four manipulators were also designed. Manipulators are equipped with microcontroller and accelerometers. Manipulators communicate with base station by means of radio transmitter. The wirelessly transmitted signals are decoded and the appropriate sound and animation is played. Sounds are stored in the boards RAM memory and are fed into digital to analog module via SPI interface. Visualization on VGA monitor shows in real-time which drum or cymbal was hit.