A driving method for a permanent magnet brushless DC motor without a position sensor
A permanent magnet brushless DC and driving method technology, applied in the field of brushless DC motor without position sensor and brushless DC motor control, can solve the problems of high electromagnetic design requirements of the motor, disadvantageous motor machining, etc., to achieve strong versatility, The effect of supplementing the range of applications
Active Publication Date: 2017-04-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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However, this method requires that the opposite potential of the motor contains a large third harmonic, and the center point of the winding needs to be drawn out, which not only requires high electromagnetic design requirements for the motor, but also is not conducive to the machining of the motor.
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[0034] The invention samples the current in the freewheeling phase in real time, calculates the slope of the phase current and compares it with a relevant threshold to indirectly detect the motor rotor position signal. This method provides a new position sensorless driving method for the submerged situation of the zero-crossing point of the back EMF, which not only has lower requirements on the back EMF waveform of the BLDC motor, but also does not need to change the structure of the motor.
[0035] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0036] The invention discloses a driving method for a permanent magnet brushless DC motor without a position sensor, which comprises the following steps:
[0037] Step 1), when the commutation time arrives, collect the current of the freewheeling phase in real time;
[0038] Step 2), solving its current slope according to the collected freewheeling phase curr...
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The invention discloses a driving method for a position-sensorless of a permanent magnet brushless direct current motor, is applied to the permanent magnet brushless direct current motor under a high-speed and heavy-load condition, and belongs to the field of permanent magnet brushless direct current motor controlling. By utilizing the characteristic that the current slop of a follow current phase is a monotone function, by setting a corresponding threshold value, the counter potential of the follow current phase can still be detected when zero crossing point is submerged. The driving method for the position-sensorless of the permanent magnet brushless direct current motor is matched with a traditional counter potential zero crossing point method, the application range of sensorless technology of the permanent magnet brushless direct current motor can be enlarged. A central point of a coil does not need to be connected out, the requirement for the counter potential waveform of the motor is low, and the adaptability is high.
Description
technical field [0001] The invention belongs to the technical field of brushless direct current motor control methods, relates to a brushless direct current motor without a position sensor technology, in particular to a permanent magnet brushless direct current motor without a position sensor driving method. Background technique [0002] Permanent magnet brushless DC motors (BLDC motors for short) have simple control methods, high power density, and high efficiency, and are widely used in high-speed electric drive applications. As an important research direction of BLDC motor, position sensorless technology eliminates the position sensor of the motor, reduces the axial length of the motor, reduces the constraints of the motor design, and improves the reliability of the system. [0003] Judging the rotor position based on the back EMF zero crossing point is one of the most widely used position sensorless solutions for BLDC motors. [0004] This method is mainly divided into ...
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IPC IPC(8): H02P6/08H02P6/182
CPCH02P6/085H02P6/182H02P6/187
Inventor 王骋邓智泉蔡骏王晓琳孙小丽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS