Method for Controlling an Electronically Commutated Polyphase DC Motor

摘要

A method for controlling a brushless DC motor (BLDC motor) having a rotor, a stator and an angle sensor and a logic circuit for generating the phase voltages of the windings depending on the phase angle of the rotor. The logic circuit access a lookup table, in which to implement commutation with block-shaped, trapezoidal, sinusoidal, sinoid-based signal waveforms. The drive values are stored for the electrical phase angle of the rotor for generating phase voltages (VU, VV, VW) for the windings. A control unit generates configuration data for the logic circuit determine the commutation form, and depending on the form, the drive values are supplied to a PWM generator for generating control signals (VU, VV, VW) depending on the electrical phase angle of the rotor angle, which PWM control signals can be used to control the phase currents in the windings.

主权项

1. A method for controlling an electronically commutated polyphase DC motor (1) with a pole number greater than two and with a winding system (2) with three winding phases, comprising
a rotor, a stator, and an angle sensor (3) for detecting the angle of the rotor, and a logic circuit (10) for generating the phase voltages of the winding system (2) depending on the electrical phase angle of the rotor, the logic circuit (10) has a storage means (11) having a lookup table, in which, in order to implement commutation with at least one of commutation forms including a block-shaped, a trapezoidal, a sinusoidal, a sinoid-based signal waveforms or with other signal waveforms which are suitable for commutation, the associated drive values are stored depending on the electrical phase angle of the rotor for generating phase voltages (VU, VV, VW) for the winding system (2), a control unit (30) for generating configuration data for the logic circuit (10), wherein the configuration data determine at least the commutation form, and depending on the commutation form, the associated drive values are supplied from the storage means (11) to a PWM generator (15) for generating PWM control signals (VU, VV, VW) depending on the electrical phase angle of the rotor determined by means of the angle sensor (3), which PWM control signals can be used to control the phase currents in the winding system (2).