CN103595307A - Brushless direct current motor electrical braking device and method for smoothly adjusting braking force - Google Patents

Abstract

The invention discloses a brushless direct current motor electrical braking device and method for smoothly adjusting braking force. The device is composed of a single-chip microcomputer, a crystal oscillator circuit, a Hall sensor circuit, a braking rotating handle, a three-phase bridge, a rotating handle sampling circuit, a drive circuit, a direct-current power supply and a power circuit. According to the braking method, the duty ratio of a single-chip microcomputer adjusting thyristor VT4, a single-chip microcomputer adjusting thyristor VT6 and a single-chip microcomputer adjusting thyristor VT2 becomes 100% from 0%, and therefore smooth braking which is converted into hard braking from soft braking is achieved. According to the brushless direct current motor electrical braking device and method for smoothly adjusting the braking force, smooth braking of a brushless direct current motor can be achieved, operation is convenient to perform for a user, and unbalance is not prone to occurring.

Description

Brshless DC motor electric brake arrangement and the method for indicating brake action smooth adjustment

Technical field

The invention belongs to a kind of electronic-controlled installation and method, be specifically related to a kind of brshless DC motor electric brake arrangement and method of indicating brake action smooth adjustment.

Background technology

The level and smooth braking that the brshless DC motor electric brake arrangement of a kind of indicating brake action smooth adjustment that electronic-controlled installation is realized and the break-make that method is Single-chip Controlling MOSFET and duty are recently realized brshless DC motor.Brshless DC motor is widely used at electric automobile and electric bicycle market, thereby the braking for traditional brshless DC motor is to control the break-make of corresponding MOSFET to make the direct short circuit of brshless DC motor three-phase realize braking mostly, but it is large that traditional braking mode is braked hardness, easily cause user's health unbalance, user is the preferential mechanical braking of selecting conventionally.Therefore, design a kind of brshless DC motor electric brake arrangement and method of indicating brake action smooth adjustment, can overcome the large drawback of braking hardness, reduce the use of mechanical braking and then reduce the loss that mechanical braking causes, coefficient of safety is high, enough has great importance.

Summary of the invention

It is large that the present invention is intended to overcome traditional brshless DC motor braking hardness, easily makes the shortcomings such as user's health is unbalance, brshless DC motor electric brake arrangement and the method for a kind of indicating brake action smooth adjustment providing.

In order to achieve the above object, the brshless DC motor electric brake arrangement of a kind of indicating brake action smooth adjustment of the present invention, this electric brake arrangement is provided with: single-chip microcomputer, crystal oscillating circuit, Hall element circuit, braking handle, three phase bridge, handle sample circuit, drive circuit, DC power supply, power circuit; DC power supply is given respectively single-chip microcomputer and drive circuitry by power circuit, the output of crystal oscillating circuit, Hall element circuit, braking handle and handle sample circuit connects respectively the input of single-chip microcomputer, and the output of single-chip microcomputer passes through drive circuit, three phase bridge successively to brshless DC motor is realized to braking.

A brshless DC motor electric braking braking method for smooth adjustment, comprises the following steps:

(1) brshless DC motor normal operation;

(2) user's rolling brake handle starts braking;

(3) adopt the handle angle of handle sample circuit sampling braking handle, when described handle angle is in preset range, single-chip microcomputer is opened brachium pontis under three phase bridge by drive circuit, turn-offs brachium pontis on three phase bridge;

(4), when described handle angle exceeds in preset range, single-chip microcomputer regulates the duty ratio of brachium pontis under logical three phase bridge gradually according to handle angle.

Advantage of the present invention and beneficial effect be mainly:

Adopt electric brake arrangement of the present invention and method can realize level and smooth braking, user is easy to operate, it is unbalance, significant to be difficult for.

Accompanying drawing explanation

Fig. 1: brshless DC motor fundamental diagram of the present invention;

Fig. 2: (a) figure is that the present invention brakes handle work schematic diagram, (b) figure is duty ratio, handle angle coordinate figure;

Fig. 3: apparatus of the present invention frame principle figure;

Fig. 4: the present invention smoothly brakes algorithm flow chart;

Fig. 5: single-chip microcomputer pin schematic drawing of the present invention;

In figure: mono-of T. thyristor effective time, the thyristor turn-off time that Ts. single-chip microcomputer is adjustable, K. handle angle is to the conversion coefficient of Ts.

Embodiment

Below in conjunction with drawings and Examples, brshless DC motor electric brake arrangement and the method for a kind of indicating brake action smooth adjustment of the present invention are described in further detail.

Fig. 1 and Figure 2 shows that the level and smooth braking method schematic diagram of brshless DC motor of the present invention.Single-chip microcomputer judges that by transducer braking handle turns over angle and controls thyristor VT4, VT6, VT2 conducting duty ratio, 100 ° of duty ratio corresponding of handle 0% to 100%, and angle and duty ratio are linear.

In conjunction with Fig. 3, Fig. 4 and Fig. 5, narrate brshless DC motor electric brake arrangement and the method for a kind of indicating brake action smooth adjustment of the present invention, described device is: brshless DC motor, single-chip microcomputer, the design selects ACT89C51, crystal oscillating circuit, Hall element circuit, braking handle, the design selects 1.0V～4.2V just, three phase bridge (6 pipe), transcoding sample circuit, 48V DC power supply, power circuit, it is characterized in that by 48V direct voltage source dividing potential drop be 5V and 15V.Crystal oscillating circuit, Hall element circuit, handle sample circuit, power circuit 5V port are connected with single-chip microcomputer respectively, and the turn-on and turn-off of Single-chip Controlling three phase bridge 6 pipes realize braking to brshless DC motor.

Described method comprises the following steps:

(1) brshless DC motor normal operation;

(2) user's turning handle;

(3) handle angle is greater than 5 °;

(4) handle forwards effective coverage to, and single-chip microcomputer P3.4 mouth receives signal;

(5) single-chip microcomputer provides Ts;

(6) in one-period T, (T-Ts) in, P0.1, P0.3, P0.5 set to 0;

(7) Ts in the time P0.1, P0.3, P0.5 put 1;

(8) metal-oxide-semiconductor VT4, VT6, VT2 duty ratio are followed according to Ts and are done corresponding adjusting;

(9) handle angle increases;

(10) Ts becomes large, and duty ratio increases;

(11) brshless DC motor is realized level and smooth braking, by soft to firmly.

Claims (2)

1. the brshless DC motor electric brake arrangement of an indicating brake action smooth adjustment, it is characterized in that, this electric brake arrangement is provided with: single-chip microcomputer, crystal oscillating circuit, Hall element circuit, braking handle, three phase bridge, handle sample circuit, drive circuit, DC power supply, power circuit; DC power supply is given respectively single-chip microcomputer and drive circuitry by power circuit, the output of crystal oscillating circuit, Hall element circuit, braking handle and handle sample circuit connects respectively the input of single-chip microcomputer, and the output of single-chip microcomputer passes through drive circuit, three phase bridge successively to brshless DC motor is realized to braking.

2. a brshless DC motor electric braking braking method for indicating brake action smooth adjustment as claimed in claim 1, is characterized in that, comprises the following steps:

(1) brshless DC motor normal operation;

(2) user's rolling brake handle starts braking;

(3) adopt the handle angle of handle sample circuit sampling braking handle, when described handle angle is in preset range, single-chip microcomputer is opened brachium pontis under three phase bridge by drive circuit, turn-offs brachium pontis on three phase bridge;

(4), when described handle angle exceeds in preset range, single-chip microcomputer regulates the duty ratio of brachium pontis under logical three phase bridge gradually according to handle angle.

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