CN2870301Y - Brush-less dc. motor double-driven monochip machine control apparatus with built-in AD converter - Google Patents

Abstract

The utility model relates to a brushless DC motor dual-drive a SCM controller (2) in which A/D convertor is mounted, pertaining to application of SCM technology in DC electric motor control field. The utility model comprises a SCM provided with A/D convertor and 3 rotor magnet steel position sensor signals taken from the counter electromotive force of the motor rotor winding. Time-sharing is adopted to test the counter-electromotive force measurement of two groups of motor rotor windings to control the commutating speed regulation of the brushless DC motor, and limit the starting current by controlling the output level of transporting circuitry; rotation speed is controlled by regulating the output voltage of the built-in D/A convertor. The utility model is not designed with hall element of position sensor, as a result, the motor structure is more rational and the cost for control is reduced. Control of dual-drive brushless DC motor and multiple interfaces reserved for function expansion can overcome the defects of built-in A/D convertor which requires hall sensor and integrated circuit controller which features high cost, poor compatibility and limitation in function expansion.

Description

The brushless DC machine double-drive single-chip microcomputer control device of built-in A/D converter (2)

Technical field the invention belongs to singlechip technology in the DC MOTOR CONTROL Application for Field.

Before background technology the invention applying date, built-in D/A converter, Hall element and application-specific integrated circuit (ASIC) are adopted in the control of attached brushless DC motor of electric vehicle, but the defective that exists cost highly compatible difference and function to expand.The brushless DC machine double-drive single-chip microcomputer control device of exempting from Hall element that does not have simultaneously the built-in A/D conversion parallel operation that is used for the dual-driven electric car.

Certainly the brushless DC machine double-drive single-chip microcomputer control device that provides a kind of built-in A/D converter (2) of summary of the invention the invention.

The invention solves the technical scheme that its technical problem adopts: comprise the single-chip microcomputer of being with A/D converter and take from three rotor magnetic steel position sensor signals of the back electromotive force of motor stator winding; Detect the measurement of the back electromotive force of two groups of motor stator windings by timesharing, the commutation speed governing of control brshless DC motor by the output level of control discharge circuit, realizes the restriction of starting current; By controlling the output voltage of built-in D/A, realize the control of rotating speed.Three rotor magnetic steel position sensor signals taking from the back electromotive force of two groups of motor stator windings are connected with the single-chip processor i/o input respectively; The single-chip processor i/o output is connected with discharge circuit with two reverse swing door circuit respectively, and the output of two reverse swing door circuit is connected with the control end of two groups of 6 power respectively, and built-in A/D converter is connected with the operational amplifier input.To take from the state of three rotor magnetic steel position sensor signals of back electromotive force of two groups of motor stator windings and the relation between two groups of 6 power tube conductings leaves among the EPROM of single-chip microcomputer with form.

The beneficial effect of the invention is: the position transducer Hall element is removed in the invention from, makes electric machine structure more reasonable, saves simultaneously and controls cost.Realization two drivings are exempted from Hall element brshless DC motor control and leave a plurality of interfaces for function expansion, overcome the defective that built-in A/D converter, Hall element and application-specific integrated circuit (ASIC) controller cost height, poor compatibility, function can't be expanded.

Appended drawings 1 is the electrical schematic diagram of the invention.

Embodiment is consulted Fig. 1.The invention single-chip microcomputer adopts U.S. MICROCHIP company 8-bit microcontroller, and present embodiment adopts the single-chip microcomputer PIC16C711 of built-in four road A/D modular converters.Delivery outlet P ₁Comprise I/O (1), I/O (2), I/O (3), I/O (4), I/O (5), I/O (6), the input with 7406 reverse swing door circuit is connected respectively.7406 output is six MOSFET power tube VF respectively ₁, VF ₂, VF ₃, VF ₄, VF ₅, VF ₆Control end be connected; Delivery outlet P ₂Comprise that I/O (7), I/O (8), I/O (9), I/O (10), I/O (11), I/O (12) are connected with the input of another 7406 reverse swing door circuit respectively.7406 output is six MOSFET power tube VF respectively ₁, VF ₂, VF ₃, VF ₄, VF ₅, VF ₆Control end be connected; Input port P ₀Comprise I/O (13), I/O (14), I/O (15), I/O (16), I/O (17), I/O (18), respectively with three rotor magnetic steel position sensor signal H of the back electromotive force of taking from two groups of motor stator windings ₁, H ₂, H ₃, H ₄, H ₅, H ₆Be connected.Delivery outlet I/O (19) is connected with an input of LM324 operational amplifier by resistance.An input of LM324 operational amplifier passes through grounding through resistance.The invention detects three rotor magnetic steel position sensor signal H of the back electromotive force of two groups of motor stator windings by timesharing ₁, H ₂, H ₃, H ₄, H ₅, H ₆, and by i.e. three the rotor magnetic steel position sensor signal H of the commutation table among the EPROM that leaves single-chip microcomputer with form in ₁, H ₂, H ₃, H ₄, H ₅, H ₆State and 6 power tube VF ₁, VF ₂, VF ₃, VF ₄, VF ₅, VF ₆Relation between the conducting, by the control word that delivery outlet is sent, difference conducting VF ₁, VF ₂VF ₂, VF ₃VF ₃, VF ₄VF ₄, VF ₅VF ₅, VF ₆VF ₆, VF ₁Promptly realize the commutation of brshless DC motor.In the process of the normal operation of brshless DC motor, by controlling the output voltage of built-in D/A, i.e. the electric current of may command brshless DC motor, and then control rotating speed of motor.Single-chip microcomputer calculates rotating speed of motor by taking from the cycle of two groups of motor stator winding back-emf signals, and it with given rotating speed relatively, as be higher than given rotating speed, and then reduce output numerical value, reduce the electric current of motor, reduce its rotating speed to reach.

Claims (2)

1, a kind of brushless DC machine double-drive single-chip microcomputer control device of built-in A/D converter (2) comprises the single-chip microcomputer of being with A/D converter and takes from three rotor magnetic steel position sensor signals of the back electromotive force of motor stator winding; It is characterized in that taking from two groups of motor stator windings back electromotive force three rotor magnetic steel position sensor signals respectively with single-chip processor i/o input connected mode mutually.

2, the brushless DC machine double-drive single-chip microcomputer control device of built-in A/D converter according to claim 1 (2), three rotor magnetic steel position sensor signals that it is characterized in that taking from the back electromotive force of two groups of motor stator windings mode that is connected with the single-chip processor i/o input respectively is: the single-chip processor i/o output is connected with discharge circuit with two reverse swing door circuit respectively, the output of two reverse swing door circuit is connected with the control end of two groups of 6 power respectively, and built-in A/D converter is connected with the operational amplifier input.