Linear motion actuator, multi-mode miniature brake and robot

The invention discloses a linear motion actuator, a multi-mode miniature brake and a robot. The linear motion actuator comprises a plurality of motion execution bodies and a plurality of actuating bodies, the motion execution bodies are sequentially arranged in a stacked mode in the first direction, and each motion execution body is provided with a first end and a second end which are oppositely arranged in the second direction. The first end part of one of two adjacent motion execution bodies is connected with the second end part of the other motion execution body through an actuating body; the actuating body can generate recoverable deformation under external stimulation, and the motion executing body connected with the actuating body can move in the second direction under driving of the deformation generated by the actuating body. According to the multi-mode micro brake, the electro-variable intelligent materials can be replaced to combine a plurality of sets of series connecting rod mechanisms and executi