| 摘要 |
A driving apparatus (1, 10, 11) of a sensorless brushless motor (9, 90) includes an inverter circuit (2) supplying a power supply voltage (Vcc) to three phase terminals (95U, 95V, 95W) of three phase armature windings (92, 93, 94) of the sensorless brushless motor provided with a stator (91) and with a rotor (100) including a pair of magnetic poles (S, N), a PWM generator circuit (5) generating a pulse-width modulation signal (SP), a position detection circuit (3, 30, 300) operating at a particular phase of the pulse-width modulation signal, detecting an induced voltage (VUi, VVi, VWi) induced at the terminal that is in a non-energization time zone and detecting a rotational position of the rotor, an inverter control circuit (4) determining an energization time zone and transmitting an energization control signal (SC) to the inverter circuit, and a PWM delay circuit (6, 60) generating a pulse-width modulation signal (SPD) for position detection by delaying the pulse-width modulation signal, wherein the position detection circuit operates at a particular phase of the pulse-width modulation signal for position detection. |
