Rapid blocking protection method and circuit for brushless direct-current motor
A brush DC motor and locked-rotor protection technology, which is applied to emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as inability to apply brushless DC motor protection, and achieve convenient setting of action thresholds , Simple structure, easy to use
Active Publication Date: 2016-11-30
NANJING FORESTRY UNIV
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Problems solved by technology
Some existing electronic protection devices for brushed DC motors adopt the protection mode of overcurrent triggering, disconnecting the power supply, and unlocking protection by reverse energization. It can be seen from the composition and control mode of the control leads of brushless DC motors that brushless DC motors The motor power line V+ and the ground line GND cannot be energized in reverse, so this mode cannot be applied to the protection of brushless DC motors, and the mode considered in the present invention is the protection mode of overcurrent trigger protection and direction control line CW / CCW flip unlock protection
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
[0026] It should be understood that terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0027] The invention discloses a method suitable for fast locked-rotor protection of a brushless DC motor and a realization circuit thereof. This method is composed of pure analog and digital circuits, which are composed of current sampling, signal amplification, threshold setting and comparison, RS flip-flop, protection blocking, protection unlocking and other parts. Among them, the protection unlocking part is composed of monostable trigger, upper Electrical reset circuit, NAND gate and other digital logic circuits.
[0028] The working principle of the protection circuit is: th...
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The invention discloses a rapid blocking protection method and circuit suitable for a brushless direct-current motor. The method is implemented by a current sampling part, a signal amplifying part, a threshold value setting and comparing part, an RS trigger part, a protection locking part and a protection unlocking part, wherein the protection unlocking part consists of logical circuits such as a mono-stable trigger, a power-on reset circuit and an NAND gate. After power-on reset of a system, the RS trigger is in a 0 state, and the motor works normally. After blocking of the motor, current of the motor is increased rapidly; a high level is output after comparison of a signal subjected to current sampling and amplification with a protection threshold value, and the RS trigger is set to 1; a PWM (Pulse-Width Modulation) signal of the motor is locked; and blocking protection is realized rapidly. When a reversing signal is overturned, a reset pulse is generated through the mono-stable trigger, and the RS trigger is set to 0, so that protection unlocking is realized, and the motor is in a normal working state. The rapid blocking protection method and circuit have the advantages of simple circuit, rapid protection and protection starting time being less than 100 [mu]s, and the running security of the motor can be improved greatly.
Description
technical field [0001] The invention relates to a motor stall protection method and circuit, in particular to a brushless direct current motor rapid stall protection method and circuit. Background technique [0002] Brushless DC motor refers to a motor driven by DC power without brushes and commutators (or collector rings). It is generally composed of a motor body and an internal integrated driver. It is a typical mechatronic product with traditional The advantages of DC motors, and at the same time cancel the structure of carbon brushes and slip rings, no sparks, reliable work, long life, widely used in automobiles, tools, industrial control, aerospace and other fields, and also play a role in automatic door and window control Big advantage. [0003] However, when brushless DC motors are used in automatic doors and windows and related control fields, when the mechanical device moves to the limit or encounters obstacles during operation and stalls, if the motor is not block...
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IPC IPC(8): H02H7/085H02H3/06
CPCH02H3/06H02H7/0856
Inventor 王勇赵芙生殷文志熊智新
Owner NANJING FORESTRY UNIV