A novel multifunctional energy harvesting microgyroscope (MEHG) system using perovskite piezoelectric materials is considered. The microgyroscope consists of a rotating microbeam made of nanocrystalline material with an attached proof mass, subject to electric actuation, and operating at high frequency. This work focuses on developing a reliable multi-fidelity model for the design of a microelectromechanical (MEMS) inertial sensing gyroscope with broadband energy harvesting capabilities. Piezoelectric energy harvesting has flourished in most recent investigations because of its ease of application and its suitability to take advantage of many environmental mechanisms for energy production. To this end, a spatially varying electric field in the model is developed in this work to approximate the behavior of the multifunctional piezoelectric energy harvester. Typically, the voltage generated by energy harvesters is modeled using an average, or constant electric field value across the length of the piezoelectric material. In this work, these two methods along with an open circuit and constant electric field case under open-circuit conditions are compared for their limits of applicability over a range of electrical load resistance values.