微电机
微電機
미전궤
MICROMOTORS SERVO TECHNIQUE
2014年
9期
64-68
,共5页
直流电机%换向电流%特征尺度分解%内禀尺度分量%自适应滤波%中心极值差分
直流電機%換嚮電流%特徵呎度分解%內稟呎度分量%自適應濾波%中心極值差分
직류전궤%환향전류%특정척도분해%내품척도분량%자괄응려파%중심겁치차분
DC motor%commutation current%local characteristic decomposition%intrinsic scale component%adaptive filtering%central extreme difference
针对直流电机无转速传感器间接测速问题，构造了基于局部特征尺度分解的具有自适应能力的滤波器组；依据直流电机电枢电流中噪声频率高、幅值小和换向电流频率高、幅值大这一特性，确定了滤波器组中内禀模态分量（ Intrinsic Scale Component ， ISC）分量的阶数以组成换向电流；为避免复杂换向过程引起的换向电流频率突变，提出了基于中心极值差分（ Central Extreme Difference ， CED）的换向电流频率求取方法；最后，根据电机电流频率和转速间的关系，获取了电机的转速特性。实验结果表明所提方法提取的换向电流较平滑，不仅获取的转速曲线波动程度较小、不存在转速突变，而且计算速度也有大幅度的提高。
針對直流電機無轉速傳感器間接測速問題，構造瞭基于跼部特徵呎度分解的具有自適應能力的濾波器組；依據直流電機電樞電流中譟聲頻率高、幅值小和換嚮電流頻率高、幅值大這一特性，確定瞭濾波器組中內稟模態分量（ Intrinsic Scale Component ， ISC）分量的階數以組成換嚮電流；為避免複雜換嚮過程引起的換嚮電流頻率突變，提齣瞭基于中心極值差分（ Central Extreme Difference ， CED）的換嚮電流頻率求取方法；最後，根據電機電流頻率和轉速間的關繫，穫取瞭電機的轉速特性。實驗結果錶明所提方法提取的換嚮電流較平滑，不僅穫取的轉速麯線波動程度較小、不存在轉速突變，而且計算速度也有大幅度的提高。
침대직류전궤무전속전감기간접측속문제，구조료기우국부특정척도분해적구유자괄응능력적려파기조；의거직류전궤전추전류중조성빈솔고、폭치소화환향전류빈솔고、폭치대저일특성，학정료려파기조중내품모태분량（ Intrinsic Scale Component ， ISC）분량적계수이조성환향전류；위피면복잡환향과정인기적환향전류빈솔돌변，제출료기우중심겁치차분（ Central Extreme Difference ， CED）적환향전류빈솔구취방법；최후，근거전궤전류빈솔화전속간적관계，획취료전궤적전속특성。실험결과표명소제방법제취적환향전류교평활，불부획취적전속곡선파동정도교소、불존재전속돌변，이차계산속도야유대폭도적제고。
Focusing on the DC motor speed sensorless indirect measurement , filter with adaptive ability based on LCD was bulid.On the basis of the characteristics of DC motor armature current noise in high fre-quency , small amplitude and high frequency , large amplitude commutation current , order of ISC component filter group consisting of commutation current was determined.In order to avoid commutating current fre-quency of mutation caused by complex commutation process , this paper proposed a method of getting commu-tating current frequency based on center extreme difference ( Central Extreme Difference , CED ).Finally , according to the relationship between the motor current frequency and speed , the speed characteristics of the motor was got.The experimental results show that the proposed method for extraction of commutation current is smooth, not only the speed curve fluctuations smaller , there is no speed mutation, and the computation speed is greatly improved.
