초록 ▼

A brushless tachometer in which output signal switching is achieved using field effect transistors and which is capable of achieving linearity over a broad range, particularly the zero speed region. According to a preferred embodiment, the brushless tachometer is operated in a current mode as part o

A brushless tachometer in which output signal switching is achieved using field effect transistors and which is capable of achieving linearity over a broad range, particularly the zero speed region. According to a preferred embodiment, the brushless tachometer is operated in a current mode as part of the servo loop to substantially reduce tachometer voltage switching requirements. A ROM can be used to control commutation switching. Commutation is preferable line-to-neutral to reduce ripple.

대표청구항 ▼

A DC tachometer comprising an alternator including a stator, a rotor, and windings for producing an alternating signal proportional to the speed of rotation; a rotor position sensor; a field effect transistor switching circuit controlled by said position sensor to produce a DC signal proportional to

A DC tachometer comprising an alternator including a stator, a rotor, and windings for producing an alternating signal proportional to the speed of rotation; a rotor position sensor; a field effect transistor switching circuit controlled by said position sensor to produce a DC signal proportional to rotor speed from said alternating signal; and wherein said position sensor indicates position by a digital code and further including a read only memory for converting said digital code into control signals for said field effect transistor switching circuit.