Shape memory alloy (SMA) bidirectional speed-variable and torque-variable SMA motor

Abstract

The invention provides a shape memory alloy (SMA) bidirectional speed-variable and torque-variable SMA motor. The SMA bidirectional speed-variable and torque-variable SMA motor comprises a power output device, a control system, a first driving unit array and a second driving unit array, wherein the first driving unit array comprises a first SMA memory alloy wire and a first locking mechanism, thefirst SMA memory alloy wire is contracted after being energized, the first lock mechanism is matched with the power output device, the power output device is positively rotated, the first locking mechanism is separated from the power output device after power failure, the power output device is idling, the second driving unit array comprises a second SMA memory alloy wire and a second locking mechanism, the second SMA memory alloy wire is contracted after being energized, the second locking mechanism is matched with the power output device, the power output device is reversely rotated, the second locking mechanism is separated from the power output device after power failure, and the power output device is idling. By the SMA bidirectional speed-variable and torque-variable SMA motor, the application flexibility is greatly improved, the SMA motor is easier to control during the application process, more uncontrollable factors are prevented, and the application range of the motor is greatly expanded.

Description

technical field [0001] The invention relates to a device for converting electrical energy into mechanical energy, in particular to an SMA bidirectional variable speed variable torque SMA motor. Background technique [0002] Shape Memory Alloy (SMA for short) motors have large output displacement and high power-to-weight ratio, so they have broad application prospects. The operating principle of the traditional SMA motor is that when the SMA spring is heated, the phase transition occurs, and the shape restoring force overcomes the spring tension to generate motion. When cooling, the SMA undergoes a reverse phase transition, at this time the SMA spring is very soft, and under the action of the tension spring, the actuator returns to its original position. So repeated, can make the motor output displacement. Restricted by the limitations of the SMA spring itself, it takes a certain amount of time for the SMA spring to heat, shrink, cool, and elongate. The response time is lon...

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Problems solved by technology

Constrained by the limitations of the SMA spring itself, it takes a certain amount of time for the SMA spring to heat, shrink, cool, and elongate. The response time is longer, and the action frequency is lower. Moreover, this SMA motor can only rotate in one direction, so this SMA motor is used in actual applications. In use, it is severely restricted

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