Electric linear actuator and electric brake device

An electric linear motion actuator comprising:

• an electric motor;
• a linear motion mechanism configured to convert rotational motion of the electric motor into linear motion of a linear motion unit via a rotation input/output shaft;
• and
• a control device connected to a power supply device for DC power, the control device being configured to drive the electric motor,
• wherein the control device includes,
• a motor driver configured to control power to be supplied to a coil of the electric motor,
• a power storage unit connected between the power supply device and the motor driver,
• a current flow direction restriction unit disposed between the power supply device and the power storage unit, the current flow direction restriction unit being configured to cause current to pass only in a direction in which power is supplied from the power supply device, and
• a step-up unit configured to step up voltage from the power supply device and provide the stepped-up voltage to the power storage unit,
• the electric linear motion actuator further comprising:
• an angle estimation device configured to estimate a rotation angle of the electric motor;
• and
• an angular speed estimation unit configured to estimate an angular speed of the electric motor based on the rotation angle estimated by the angle estimation device,
• wherein the control device further includes,
• a voltage estimation unit configured to estimate voltage of the power storage unit, and
• an electric motor output restriction section configured to restrict an output for the electric motor based on the angular speed estimated by the angular speed estimation unit, the electric motor output restriction section being configured to set a maximum output for the electric motor to be larger when the voltage estimated by the voltage estimation unit is larger.