Motor driving apparatus for driving and braking brake-equipped motor
AssigneeFanuc Corporation
InventorsShinichi Horikoshi, Naoyuki Suzuki, Tsutomu Shikagawa
Life of this patent
Estimating the term…
Abstract
A motor driving apparatus for driving and braking a motor equipped with a brake comprises a motor/brake driving DC power supply which is used both as a motor driving power supply and as a brake driving power supply, wherein when the motor/brake driving DC power supply is being used as the motor driving power supply, a voltage conversion circuit via which a voltage supplied from the motor/brake driving DC power supply is applied to the brake feedback-controls the voltage applied to the brake. This configuration serves to reduce the loss (due to temperature rise) in the brake coil of the motor being driven to move a robot arm.
Claims6
A motor driving apparatus for a drive motor equipped with a power-off brake, said apparatus comprising:
- a brake driving circuit for supplying a brake-release voltage to a power-off brake;
- a voltage conversion circuit;
- and
- a control unit for supplying control signals to the brake driving circuit and the voltage conversion circuit;
- wherein the voltage conversion circuit is configured to generate:
- a first voltage for inputting to the brake driving circuit, the first voltage generated for a predetermined period after a start of supplying a voltage to the drive motor;
- and
- a second voltage for inputting to the brake driving circuit, the second voltage lower that the first voltage, for holding said power-off brake in a released condition after the predetermined period.
A motor driving apparatus for a drive motor equipped with a power-off brake, said apparatus comprising:
- a brake driving circuit for supplying a brake-release voltage to a power-off brake;
- a voltage conversion circuit for applying a voltage to the brake driving circuit;
- and
- a control unit for releasing the power-off brake, the control unit configured to generate:
- an output voltage control signal to the voltage conversion circuit, and
- a brake energization enable signal to the brake driving circuit,
- wherein while the brake energization enable signal is outputted, the voltage conversion circuit and brake driving circuit are configured to generate the brake release voltage having:
- a pulse voltage with a first duty cycle during a predetermined period while the output voltage control signal is input to the voltage conversion circuit;
- and
- a pulse voltage with a second duty cycle lower than the first duty cycle when the output voltage control signal ceases.
Dependencies are inferred from the claim text.