Method for starting motor without position sensor

Abstract

The invention discloses a method for starting a motor without a position sensor, which includes: applying a fixed voltage vector to the motor and obtaining Is; subjecting the Is to Clark conversion and obtaining i <alpha> and i <beta>; presetting rotation speed omega r and torque T<e> as 0 by computing to obtain rotor flux-linkage vector angle theta r, subjecting omega r and omega r to PI operation to obtain Te, then subjecting Te and the T3 to PI operation to obtain delta, obtaining theta<s> according to the formula theta <s>=theta <r> +delta, giving Psi* <s> to obtain U<alpha> and U<beta>, subjecting the U<alpha> and the U<beta> to inverse Clark conversion and obtaining U, U and U<c>, acquiring I, I and I<c> through current, subjecting the I, the I and the I<c> to Clark conversion and obtaining I alpha and I beta, obtaining Psi <s> alpha and Psi<s> beta by stator flux linkage operation, obtaining Psi<s> and theta<s> by modular angle operation, obtaining the Te by torque estimate, discretizing the theta<s> to obtain omega<r>, and finishing motor starting process if the omega<r> is equal to the omega*<r>. The method for starting the motor without the position sensor has the following advantages that by combining initial position detection technology with DTC (direct torque control) strategy, loop-locked stable control of the integral control strategy is realized.

Description

technical field [0001] The invention belongs to the technical field of electronic engineering, in particular to an advanced motor starting method that does not require a position sensor by using an initial position detection method combined with a direct torque control strategy, that is, a position sensorless motor starting method. Background technique [0002] Space Vector Pulse Width Modulation Abbreviation: SVPWM [0003] Direct Torque Control Direct Torque Control Abbreviation: DTC [0004] Field Oriented Control Abbreviation: FOC [0005] Integral proportional operation Proportion Integral abbreviation: PI [0006] Although the existing motor field-oriented control FOC strategy does not require a position sensor, it is necessary to drag the motor to a certain speed when the motor starts, so that the motor speed can be continuously adjusted, that is to say, the speed open-loop control strategy is adopted during the motor startup process , when the motor accelerates to...

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Problems solved by technology

[0006] Although the existing motor field-oriented control FOC strategy does not require a position sensor, it is necessary to drag the motor to a certain speed when the motor starts, so that the motor speed can be continuously adjusted, that is to say, the speed open-loop control strategy is adopted during the motor startup process , when the motor accelerates to the set speed, it switches to the speed closed-loop control strategy, which prolongs the start-up time of the motor; in order to overcome the defect that the motor starts in the field-oriented control FOC strategy and needs open-loop dragging, the motor direct torque control appears The DTC strategy does not need to drive the motor to a certain spee

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