For low-cost applications, trapezoidal control of permanent magnet (PM) brushless motors is an attractive approach. To synchronize the rotor flux with the stator, position information about the rotor is required. This information is measured by sensors or estimated using sensorless techniques. The latter eliminates the need for position sensors, thereby minimizing costs. These techniques include closed and open-loop observers, back EMF sensing methods, and HF signal injection. Among these, back EMF sensing is particularly suitable for trapezoidal control. This paper examines the use of trapezoidal control in the speed regulation of PM brushless motors. It reviews back EMF-sensing techniques, covering recent developments, discusses four types of rotor position detection methods: terminal voltage sensing, back EMF integration, third harmonic voltage, terminal current sensing, and addresses their limitations in high-speed operations.