Control device for brushless direct current motor sensorless and method thereof

A brushed DC motor and control device technology, applied in electronic commutation motor control, single motor speed/torque control, control system, etc. The volume and cost of the system, the complexity of the control algorithm, etc., achieve the effect of large output, low cost, and small torque ripple
CN101557187BInactive Publication Date: 2011-03-30SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2011-03-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a control device for a brushless direct current motor sensorless based on 12-beat control and a method thereof. The device comprises a direct current power supply, a three-phase inverter, a brushless direct current motor, a drive circuit of a power device of the three-phase inverter, a microcontroller and a rotor position detection circuit, wherein the direct current powersupply is connected with the brushless direct current motor through the three-phase inverter; after the rotor position detection circuit is connected with the brushless direct current motor for detecting, an output signal is directly connected with an analog-to-digital conversion input pin of the microcontroller; and six-path output of the microcontroller is connected to the three-phase inverterthrough the drive circuit of the power device of the three-phase inverter. The method detects terminal voltage of an inactive phase winding in a two-pipe conducting region at PWM conducted moment by an analog-to-digital conversion unit embedded in an XC866 singlechip, and acquires back electromotive force zero crossing as accordance of 12-beat phase conversion, thereby reducing the requirement ofthe adopted control device of the brushless direct current motor sensorless on a peripheral circuit, and achieving the aims of not only effectively inhibiting electromagnetic torque pulsation, but also reducing the system cost.
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Description

Technical field:

[0001] The invention relates to a position sensorless control device and method for a brushless direct current motor, in particular to a position sensorless control device and method for a brushless direct current motor with low cost and capable of effectively suppressing electromagnetic torque ripple. Background technique:

[0002] At present, the conventional method used to control the brushless DC motor is the 120° conduction type three-phase six-state square wave drive method. This method usually uses 3 Hall elements as position sensors, and performs 6 commutation steps within 360° electrical angle. The algorithm is simple, and the drive control circuit is also relatively simple, so the cost is low and it is suitable for many large-scale applications. However, the outstanding disadvantage of this method is that the winding current contains rich harmonics, which makes the electromagnetic torque ripple large, resulting in poor running stability of the moto...

Claims

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