Speed/Torque Estimation and Control of a DC Machine in Four Quadrants Operation Modes. Al-Nahrain Journal for Engineering Sciences, [S. l.], v. 21, n. 2, p. 238–247, 2018. DOI: 10.29194/NJES21020238. Disponível em: https://nahje.com/nahje/article/view/444. Acesso em: 28 apr. 2026.