A controller of the electric brake device includes a reaction force compensator to perform compensation such that a rotational resistance, of an electric motor, generated by a reaction force to a pressing force of a friction member against a brake rotor is cancelled out. The reaction force compensator includes: a direct estimator to directly estimate the reaction force from information including at least either a drive voltage or current of the electric motor and at least either a rotational angle of the electric motor or a value obtained by differentiating the rotational angle one or more times; an indirect estimator to estimate the reaction force from an estimated braking force on the basis of a set correlation; and a compensation reaction force determiner to determine a reaction force, to perform the compensation, by using estimation results of direct estimation and indirect estimation at predetermined proportions.

This invention relates to an active control system for a variable electromotive-force generator (VEG) for use in wind turbines, ships, hybrid vehicles, and related applications.

Provided is an electric brake device that is able to achieve redundancy when an abnormality occurs in a load sensor, without increasing the size of the load sensor. The electric brake device includes a brake rotor, a friction pad, an electric motor, a transmission mechanism, braking force command section, braking force estimation section, motor rotation angle detector, and a controller. The braking force estimation section includes a load sensor configured to detect elastic deformation of a determined member forming the electric brake device. The controller includes sensor abnormality detector configured to store a sensor output of the load sensor at a motor rotation angle at which a braking force becomes zero, and infer the occurrence of plastic deformation in the load sensor from transition of the stored sensor output.

Provided is an electric brake device that is able to achieve redundancy when an abnormality occurs in a load sensor, without increasing the size of the load sensor. The electric brake device includes a brake rotor, a friction pad, an electric motor, a transmission mechanism, braking force command section, braking force estimation section, motor rotation angle detector, and a controller. The braking force estimation section includes a load sensor configured to detect elastic deformation of a determined member forming the electric brake device. The controller includes sensor abnormality detector configured to store a sensor output of the load sensor at a motor rotation angle at which a braking force becomes zero, and infer the occurrence of plastic deformation in the load sensor from transition of the stored sensor output.

The invention relates to a brake and to a method for controlling the brake. The brake comprises a base part, a braking piece movably supported on the base part, which braking piece is configured to be moved between a braking position and a releasing position, a spring, with the spring force of which the braking piece can be dropped into a braking position, a support member for limiting the initial position of the drop-out movement of the braking piece and also a controllable actuator, which is mechanically connected to the aforementioned support member and configured to displace the initial position of the drop-out movement of the braking piece with respect to the braking position.

A method of operating electric brakes for a vehicle including monitoring at least a voltage in a power system of the vehicle, and adjusting a power provided to the electric brakes based on at least the monitored voltage to control a current according to a predetermined behavior.

A method of operating electric brakes for a vehicle including monitoring at least a voltage in a power system of the vehicle, and adjusting a power provided to the electric brakes based on at least the monitored voltage to control a current according to a predetermined behavior.

A brake drive control circuit of a servo motor which detects malfunction of a semiconductor circuit at the brake drive control circuit, that is, a brake drive control circuit which connects two semiconductor circuits in series to a brake and uses a voltage detection circuit which detects the presence of voltage which is applied to the brake by brake signals turning the semiconductor circuits on/off so as to detect test pulses in the voltage which is applied to the brake due to test pulses which are included in the brake signals and turn the semiconductor circuits off for instants during an operation for disengaging the brake and detect malfunctions of the semiconductor circuits by the detection of the test pulses.

A brake drive control circuit of a servo motor which detects malfunction of a semiconductor circuit at the brake drive control circuit, that is, a brake drive control circuit which connects two semiconductor circuits in series to a brake and uses a voltage detection circuit which detects the presence of voltage which is applied to the brake by brake signals turning the semiconductor circuits on/off so as to detect test pulses in the voltage which is applied to the brake due to test pulses which are included in the brake signals and turn the semiconductor circuits off for instants during an operation for disengaging the brake and detect malfunctions of the semiconductor circuits by the detection of the test pulses.

Provided is an electric brake device that is able to achieve redundancy when an abnormality occurs in a load sensor, without increasing the size of the load sensor. The electric brake device includes a brake rotor, a friction pad, an electric motor, a transmission mechanism, braking force command section, braking force estimation section, motor rotation angle detector, and a controller. The braking force estimation section includes a load sensor configured to detect elastic deformation of a determined member forming the electric brake device. The controller includes sensor abnormality detector configured to store a sensor output of the load sensor at a motor rotation angle at which a braking force becomes zero, and infer the occurrence of plastic deformation in the load sensor from transition of the stored sensor output.