i have a 24V DC motor with 4 wires, 2 wires is input and i never used the other. but when i o'scope it produce a sine wave when i operate the motor. the frequency goes higher as the motor moving faster.
i dont know what it is exactly but someone told me it is a resolver, is that true?
i think i can make a tachometer by using it, any suggestion how to? and how do i calibrate it?
i have a 24V DC motor with 4 wires, 2 wires is input and i never used the other. but when i o'scope it produce a sine wave when i operate the motor. the frequency goes higher as the motor moving faster.
i dont know what it is exactly but someone told me it is a resolver, is that true?
i think i can make a tachometer by using it, any suggestion how to? and how do i calibrate it?
Sounds like a auxiliary generator winding used for speed feedback. One could wire the windings to a op amp comparator to convert to variable frequency square waves then then measure with a frequency counter type circuit or process with a micro controller chip to convert to RPM and display as you wish.