The present invention relates to a fluid pump and a fluid-transfer plate and a sensor for a fluid pump, particularly applicable to linear compressors, for detecting the position of the respective piston and preventing the latter from colliding with the fluid-transfer plate upon variations in the compressor operation conditions, or even variations in the feed voltage. The objectives of the present invention are achieved by means of a fluid pump (1) comprising a piston (2) that is axially displaceable within a cylinder (3), the cylinder (3) comprising a cylinder closing fluid-transfer plate (40), the piston (2) being displaced toward the fluid-transfer plate (40) and capturing a gas or fluid from a low-pressure environment (11), and the fluid pump (11) comprising a sensor assembly (98), which includes an inductive sensor (8) associated with the fluid-transfer plate (40). The objectives of the present invention are also achieved by means of a fluid-transfer plate (40) particularly applicable to a fluid pump (1) and that comprises a valve plate (4) provided with a though-bore (10) for associating a protector (9) that cooperates with the cavity (10), the protector (9) comprising at least one sensor cavity (8') for associating an inductive sensor (8). An inductive sensor (8) is also foreseen, which is applicable to the fluid pump (1).