3-Phase BLDC Motor Sensorless Control Using MC56F8013

Appendix B.GlossaryAC — alternating currentADC — analogue-to-digital converterback-EMF — back electromotive force (in this document, it means the voltage induced in motor windingdue to the movement of the rotor)brush — a component that transfers electrical power, from non-rotational terminals mounted on thestator, to the rotorBLDC motor — brushless direct current motorcommutation — a process providing the creation of a rotation field by switching of power transistor(electronic replacement of brush and commutator)commutator — a mechanical device that alternates the DC current in a DC commutator motor, causingrotation of the DC commutator motorCOP — Computer operating properly watchdog timerDC — direct currentDC-bus — power supply bus carrying direct currentDC motor — direct current motor; unless stated otherwise, it means a motor with brushesDSP — digital signal processordead-time (DT) — short time that must be inserted between turning off one transistor in an inverter halfbridge and turning on the complementary transistor, because of the limited switching speed of thetransistorsduty cycle — the ratio of the time a signal is on to the time it is off; duty cycle is usually stated as apercentage.GPIO — general purpose input/outputHall sensor — a position sensor. In this application, sensors are arranged to give six defined events(each 60 electrical degrees) per electrical revolution (for a 3-phase motor)interrupt — a temporary break in the sequential execution of a program to respond to signals fromperipheral devices by executing a subroutineISR — interrupt service routineI/O — input/output interfaces between a computer system and the external world. A CPU reads an inputto sense the level of an external signal and writes to an output to change the level on an external signalJTAG — a Joint Test Action Group interface allowing on-chip emulation and programmingLIN — local interconnect networklogic 1 — a voltage level approximately equal to the input power voltage (V DD )3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 0Freescale Semiconductor 93