CN103569341A

CN103569341A - Brushless motor speed controller capable of detecting model propeller position by using infrared

Info

Publication number: CN103569341A
Application number: CN201210260459.6A
Authority: CN
Inventors: 阳志坚
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-26
Filing date: 2012-07-26
Publication date: 2014-02-12

Abstract

A brushless motor speed controller (hereinafter governor) capable of detecting the model propeller position by using infrared achieves control of rotation speed of a model propeller. A battery (1) provides a power supply, a receiver (4) outputs a pulse width signal to control the governor (2), the governor controls a brushless motor (3) to operate, the motor drives a propeller gear (6) through a motor gear (5) to drive the propeller (7) to rotate, and meanwhile an infrared transmitting tube (8) is driven to emit an infrared signal. When the propeller (7) rotates and passes through the position right above an infrared receiving pipe (9), the infrared (11) is reflected back, and the infrared receiving pipe (9) converts the infrared into an electric signal to a single-chip microcomputer of the governor. The rotation speed of the propeller is calculated according to signal cycle time, and transmission ratio = motor rotation speed/propeller rotation speed. An infrared remote controller (12) inputs the model propeller rotation speed, the motor rotation speed is calculated according to the formula that motor rotation speed = propeller rotation speed * transmission ratio, and the governor keeps the motor rotation speed constant.

Description

The brushless motor speed controller of infrared detection model propeller position

The brushless motor speed controller of infrared detection model propeller position (is designated hereinafter simply as: be governor) for model plane, car mould, ship model, flying saucer etc. remote control electric model (is designated hereinafter simply as: model) upper position-sensor-free DC Brushless Motor (is designated hereinafter simply as: speed controller motor).

The mode of current model plane brushless motor speed controller is as follows: the micro controller system (4) of governor (3) delivered to positive pulsewidth " throttle " value (2) of 1000us-2000us by receiver in Fig. 1 (1), and micro controller system output PWM (pulse duration modulation) (5) controls MOSFET (6) CD-ROM drive motor (7); While motor produces inverse electromotive force (10) and feeds back to micro controller system as the foundation of motor Phase Change Opportunity judgement in the process of running; Battery (9) provides power supply to micro controller system and receiver and MOSFET by voltage stabilizing IC (8).This control process is open loop, Fig. 2 can find out that in governor, micro controller system output pwm signal changes according to receiver output valve " throttle ", brushless motor speed controller is the rotating speed of detection model screw propeller not, screw propeller is subject to load variations (such as wind-force: windward or against the wind), during the affecting of the factors such as the variation of cell pressure (battery electric quantity is relatively full or electric weight is not enough), will directly have influence on rotating speed, the variation of rotating speed will cause operator's feel variation, it is fine that during flight, sensation " imperfectly " has just started model performance power, the obvious perceptual model under power of decline along with cell pressure.

For overcoming the problem of the rotating speed that current brushless motor speed controller can not precise control model screw propeller, patent of the present invention can realize the direct input model propeller speed with Infrared remote controller Fig. 3 (12), and governor will automatically be controlled and maintain this rotating speed.On the basis of original brushless motor speed controller, add infrared module Fig. 1 (11), it comprises an infrared transmitting tube (13) and an infrared receiving tube (12), and Infrared remote controller (14).

Concrete control method is as follows:

When the first, in Fig. 3, motor rotates, motor gear (5) drives screw propeller gear (6) and screw propeller (7) synchronous rotary.

Governor (2) is controlled infrared ray sending tube (8) and is sent infrared signal (11), only have when screw propeller (7) through infrared receiver tube (9) directly over time infrared ray be reflected back (11), infrared receiver tube (9) receives that returning the infrared signal of penetrating converts thereof into electric signal and give governor (2); Around this principle can test out accurately the time that screw propeller turns around, i.e. propeller speed.

The second, by learning motor rotary speed to the statistics of commutation number of times in the unit time, so: propeller speed/motor rotary speed=transmitting ratio.Transmitting ratio parameter is a constant, and its only can become because of model for a change.Only need to be before using new model test once, the micro controller system of governor the inside is recorded in the memory device that data are not lost after inner power down, next time need to be directly call all right.

If the 3rd user want to allow model propeller rotating speed=2000RPM (rev/min), by Infrared remote controller (Fig. 3) (12), directly aim at infrared receiving tube (9) and input 2000.It is as follows that governor is controlled step:

1, in memory device, recall the transmitting ratio parameter of "current" model, if: motor turns 12 circle screw propellers and turns 1 circle, that is: transmitting ratio=12: 1;

2, governor passes through: motor rotary speed=propeller speed * transmitting ratio is calculated screw propeller rotating speed corresponding to motor will reach 2000RPM time.That is: motor rotary speed=2000*12=24000RPM;

3, in Fig. 1, receiver (1) is only used for judging that by the positive pulse width signal governor of 1000us-2000us motor (7) stops or starting, as: be greater than 1100us motor starting, be less than 1100us motor and stop.

4, in Fig. 1, the micro controller system (4) in governor (3) is received and is greater than after the positive pulse width signal of 1100us, and output PWM (5) driven MOS FET (6) controls motor (7) rotation; Add up the commutation number of times of motor in the unit time simultaneously and calculate motor rotary speed.If strengthening the dutycycle of output PWM during lower than 24000RPM, motor improves motor rotary speed; If motor rotary speed reduces to export the dutycycle of PWM during lower than 24000RPM and reduces motor rotary speed.Like this that motor rotary speed is constant in 24000RPM, realize constant helical oar rotating speed at 2000RPM.

By describing above: the motor that governor calculated model by infrared detection model propeller rotating speed and motor rotary speed is before this to the transmitting ratio between screw propeller and preserve transmitting ratio parameter, then utilizes motor rotary speed corresponding to model transmitting ratio calculation of parameter model propeller rotating speed.Recycling is controlled PWM and is maintained this motor rotary speed and reach the constant process of propeller speed of controlling.When screw propeller be subject under external loading variable effect or when model cell pressure changes the monolithic function of governor inside automatically increase or reduce output pwm motor and maintain a constant rotating speed.User can fly to battery electric quantity deficiency and feel that all the time power is abundant from model, obtains excellent operation feel; Isochronous governor also can be brought into play best efficiency.

Accompanying drawing explanation:

Fig. 1 is electric function block scheme of the present invention;

Fig. 2 is current governor micro controller system output PWM value and receiver output signal value corresponding relation;

Fig. 3 is work system detail drawing involved in the present invention.

Claims

1. by infrared detection remote control electric model, (be designated hereinafter simply as; Model) infrared module of propeller speed, is characterized in that: utilize infrared ray sending tube to send infrared signal, the screw propeller that signal runs into model reflects by infrared receiver tube to be received, and is converted to electric signal; By infrared receiver tube output signal, reflect that model propeller is through the period of infrared receiver tube top position, thereby calculate propeller speed.

2. use the account form of " transmitting ratio=position-sensor-free DC Brushless Motor (hereinafter to be referred as: motor) rotating speed/propeller speed " relation, it is characterized in that: model motor speed controller, by motor rotary speed and the propeller speed of certain methods test model, calculates the transmitting ratio of model by both.

3. governor, by the account form of " propeller speed=motor rotary speed/transmitting ratio " relation, is characterized in that: governor tests out the motor rotary speed of model and the transmitting ratio of model by certain methods, by both, calculates model propeller rotating speed.

4. utilize infrared ray transmitting apparatus is arranged governor parameter, it is characterized in that: utilize by infrared ray transmitting apparatus as: Infrared remote controller, infrared arrange card, etc. utilize infra-red code to modulate equipment, apply to model governor and carry out parameter setting.