Cascaded type step-up accelerating unit of brushless vibrating motor with no sensor
A vibration motor and acceleration device technology, applied in the direction of single motor speed/torque control, etc., can solve problems such as potential safety hazards, installation space and cost constraints of micro motors, and impact on service life
Inactive Publication Date: 2009-08-12
SHANGHAI BEILING
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Problems solved by technology
In order to obtain an effective vibration feeling, the rated speed of the motor is required to reach 10,000 revolutions per second. However, the sparks and electromagnetic radiation generated by mechanical friction during the high-speed commutation process of the brush structure of the traditional motor will not only affect its service life, but also affect its service life. Some occasions (such as airplanes, mines and gas stations, etc.) will also bring serious safety hazards
Although brushless DC motors can avoid these hidden dangers, they are restricted by the internal installation space and cost of micro motors
Method used
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[0009] like Figure 1~2 As shown, the present invention, that is, a stepwise progressive acceleration device for a brushless sensorless vibration motor, includes a presettable 1 / N frequency divider 1, a step maintenance frequency divider 2, a speed step counter 3, a data comparator 4, a prohibition Gate 5 and timer 6, each unit circuit adopts Motorola's logic chip.
[0010] The 1 / N frequency divider 1 can be preset, which is used to generate all "0" output pulses whose frequency is accelerated by steps. It consists of two four-bit preset subtraction counter chips MC14526 (U2, U3). The 8 bits with variable period can be preset to 1 / N frequency divider, and its frequency division coefficient is 1≤N≤255. Its clock input terminal is connected with the output terminal of the timer 6, so the starting speed of the motor after power-on can be controlled by the quotient of the timer output frequency fin and the preset value of 1 / N / frequency divider. Its all "0" output pulse output te...
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The accelerating unit includes following parts: a presentable 1 / N frequency divider in use for generating frequency to obtain cascaded step-up accelerating all '0' output pulse; inhibition gate in use for transferring signal to step sustaining frequency divider; step sustaining frequency divider in use for ensuring hold time needed for accelerating motor each time; counter of speed step in use for making statistics, and indicating up to date accelerating course for motor; data comparator in use for determining whether motor reaches to presetting rotation speed; timer in use for generating clock signal. According to presetting condition, the invention controls accelerating characters based on change of drive pulse frequency. Thus, phase change signal follows position of rotor precisely so as to stop falling out of step. The invention can accelerate motor to near 10000 rotations per minute in less than one second after power on.
Description
technical field [0001] The invention relates to a stepwise progressive acceleration method and device for a brushless sensorless vibration motor, in particular to a stepwise progressive acceleration method and device for a brushless sensorless vibration motor used in mobile phones. Background technique [0002] At present, DC vibration motors have been widely used in mobile phone call prompts, and the size of DC vibration motors is getting smaller and smaller. In order to obtain an effective vibration feeling, the rated speed of the motor is required to reach 10,000 revolutions per second, but the sparks and electromagnetic radiation generated by the mechanical friction of the brush structure of the traditional motor during the high-speed commutation process will not only affect its service life, but also affect its service life. Some occasions (such as airplanes, mines and gas stations, etc.) will also bring extremely serious safety hazards. Although the DC brushless motor...
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IPC IPC(8): H02P6/08
Inventor 郑贤芳顾鹏程傅文波
Owner SHANGHAI BEILING