A brushless DC motor controller with automatic adjustment of phase advance angle

Abstract

The invention discloses a brushless direct current motor controller with a function of automatically adjusting phase advance angle. The brushless direct current motor controller comprises a brushless motor control chip, an IGBT inversion unit, a rotor position detecting circuit, an over-current detection circuit and a power source. The over-current detection circuit is used for detecting a busbar current signal, converting the busbar current signal into a voltage signal (Uf) and sending the voltage signal to an over-current input foot (If) processed by the brushless motor control chip. The rotor position detecting circuit is used for inputting a position signal of a rotor into the brushless motor control chip which is used for outputting a signal to the IGBT inversion unit, an output end of the IGBT inversion unit is connected with a motor winding, the voltage signal (Uf) output by the over-current detection circuit is further connected with an amplifying circuit, and an output end of the amplifying circuit is connected with a phase advance angle input end of the brushless motor control chip. According to the brushless direct current motor controller, the phase advance angle can be automatically adjusted according to a bushar current to adapt to different loads, the adjustment range of the phase advance angle is wide, the demands of multi-rotating speed and multi-power application on a motor are met, and motor efficiency is improved.

Description

Technical field: [0001] The invention relates to a DC brushless motor controller capable of automatically adjusting the phase advance angle. Background technique: [0002] At present, the brushless DC motor control chip IC and corresponding hardware are used to control the operation of the brushless DC motor without writing software, the circuit structure is simple, the control is simple, the manufacturing cost is low, and the large-scale production is convenient, such as figure 1 As shown, it mainly includes DC brushless motor special control chip (such as 6551, 6854 and other ICs), IGBT inverter unit, rotor position detection circuit (mainly Hall sensor), resistor R19 detects bus current and converts it into voltage signal Uf, Then send it to the overcurrent input pin If of the dedicated control chip for the DC brushless motor. In addition, the phase advance angle voltage signal is set by resistive voltage division, and the voltage signal is input to the input terminal AN...

AI Technical Summary

Problems solved by technology

At present, many motor factories are confused by the following problems: 1. Configure the advance angle according to the load point of the motor. If the advance angle is too large, the motor will often fail to start when starting.

2. With the application of multi-speed and multi-power motors by customers, the fixed advance angle no longer meets the high efficiency requirements of the entire range

3. The dedicated control chip IC for brushless DC motors cannot be like a software solution, and can be written into the advance angle formula, etc.

Even if it is written, it is not suitable for every motor

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