摘要:
An electric tool control circuit comprises a central control module, a motor drive module, a motor, and a working parameter detection module. The working parameter detection module is separately electrically connected to the motor and the central control module, and the working parameter detection module can return a parameter that is detected when the motor works to the central control module. The motor drive module is separately electrically connected to the motor by using first and second switch modules, and the motor drive module controls the first and second modules to be discontinuously on and off. The features of first switch module and the second switch module being on and off are always contrary, that is, when a first switch is on, a second switch is off, and when the first switch is off, the second switch is on.
摘要:
A method of determining when to utilise a back EMF sampling method for motor resistance profiling in at least one DC motor, the method including the steps of analysing a parameter prior to initialising the back EMF sampling method, and upon a determination that the analysed parameter is within a defined range, initialising the back EMF sampling method.
摘要:
Apparatus and associated systems and methods may relate to a process for supplying unidirectional current to a load, controlling a reverse electromotive force (REMF), capturing inductive energy from the load, and supplying the captured inductive energy to the load. In an illustrative example, an operating cycle may include a sequence of operations. First, inductive energy captured from the load on a previous cycle may be supplied to the load. Second, energy may be supplied to the load from an external power source. Third, a REMF voltage may be substantially controlled upon disconnecting the power source from the load. Fourth, the load current may be brought to zero by capturing the inductive energy for use on a subsequent cycle. In some embodiments, a single power stage may supply a DC inductive load, or a pair of power stages may be operated to supply bidirectional current to an AC load.