CONTROL METHOD FOR SPEED OF BRUSHLESS D.C. MOTOR AND BRUSHLESS D.C. MOTOR

摘要

PURPOSE: To adapt a speed to specific requests, such as external conditions by a simple component, for example, by controlling the closing and breaking of a stator current in terms of time according to a specific rule, based on a time difference between two specific rotor positions. CONSTITUTION: Each parameter, for example, a voltage Uc of a capacitor C, is set to an initial value at a first specific rotor position, for example, at a first commutation point and is changed continuously, depending on time. Then, the parameter is compared with another parameter that depends on, for example, a control variable (for example, a temperature), and a comparison signal Udif is formed in the case of a specific comparison standard. Then, a time difference between the starting time of a comparison signal Udif and the time of a second specific rotor position following a first specific rotor position, for example, a time difference to a second commutation point following the first commutation time is obtained. Then, the closing and/or breaking of stator currents i1 and i2 are controlled in terms of the time, according to at least a specific rule based on the time difference.