This paper compares the available technologies for linear electromagnetic alternators and categorizes them in order to find the best solutions for the thermoacoustic based CHCP. Tubular oscillating permanent magnet actuator featuring SMC stator with a quasi-Halbach PM slider is analyzed and modeled theoretically. Here, a similar configuration is compared to other moving magnet structure but employing open modular construction with laminated magnetic steel winding cores and a critical comparison is made relying on electromagnetic and mechanical simulations to retrieve the best solution for the thermoacoustic application. © 2009 IEEE.