Electronic jar of changeable release speed

The utility model provides an electronic jar of changeable release speed, it contains an actuator disk pole, a screw rod and a motor. Motor drive the screw rod rotates, makes the actuator disk pole for the axial of the screw rod removes. The motor contains a stator, a rotor, a plurality of switching -over piece and at least three brush. At least three brush contains a positive brush, a negative brush and at least one auxiliary brush. A direct current positive voltage is connected to the positive brush. Through the adjustment the negative brush with at least one auxiliary brush's no. 1 connectsa direct current negative voltage, in order to change the motor the rotational speed of rotor, and then control the translation rate of actuator disk pole, borrow this, reach the efficiency of the changeable release speed of electronic jar. 本实用新型提供种可切换释放速度的电动缸，其包含致动杆、螺杆以及马达。所述马达驱动所述螺杆转动，使所述致动杆相对于所述螺杆轴向移动。所述马达包含定子、转子、多个换向片以及至少三个电刷。所述至少三个电刷包含正电刷、负电刷以及至少个辅助电刷。所述正电刷连接直流正电压。通过调整所述负电刷与所述至少个辅助电刷的者连接直流负电压，以改变所述马达的所述转子的转速，进而控制所述致