Hydraulic fluid supply device and electric actuator

A hydraulic fluid supply device, comprising:

• an adjustable-speed motor;
• a variable-volume pump which is driven by the adjustable-speed motor and ejects hydraulic fluid;
• an electric motor control unit which controls the adjustable-speed motor so as to achieve an intended rotation speed;
• and
• a pump control unit which controls the variable-volume pump so that the ejection volume of the variable-volume pump equals a first ejection volume while the ejection pressure of the variable-volume pump is lower than a predetermined pressure, and that the ejection volume of the variable-volume pump equals a second ejection volume when the ejection pressure of the variable-volume pump reaches the predetermined pressure, the second ejection volume being smaller than the first ejection volume.

A hydraulic fluid supply device, comprising:

• adjustable-speed motor;
• a variable-volume pump which is driven by the adjustable-speed motor and ejects hydraulic fluid;
• an electric motor control unit which controls the adjustable-speed motor so as to achieve an intended rotation speed;
• and
• a pump control unit which controls the variable-volume pump so that
• the ejection volume of the variable-volume pump equals a first ejection volume until a predetermined period elapses from a point when the rotation speed of the adjustable-speed motor is stabilized,
• and that the ejection volume of the variable-volume pump equals a second ejection volume upon elapse of the predetermined period from the point when the rotation speed of the adjustable-speed motor is stabilized.