Abstract: An auxiliary power supply unit includes an auxiliary power supply device and a downstream power supply line group connecting the auxiliary power supply device to motor units. The auxiliary power supply device includes: an auxiliary power supply provided on a power supply path; and a switching circuit configured to switch the connection state of the auxiliary power supply to the power supply path. The connection state of the auxiliary power supply includes a boost state in which the auxiliary power supply is connected in series with the external power supply. The downstream power supply line group includes branch first downstream drive lines and branch second downstream drive lines. Each of the upstream ends of the branch first downstream drive lines and the branch second downstream drive lines is connected to the power supply path at a position downstream of the auxiliary power supply.

Abstract: A PLL for controlling a motor includes first and second feedback loops. The first feedback loop includes an oscillator for generating a signal having a frequency corresponding to an input voltage, a first phase comparator for outputting a first phase difference signal corresponding to a phase difference between the signal from the oscillator and an input signal, and a first smoothing filter for smoothing the first phase difference signal to output the smoothed signal as the input voltage. The second feedback loop includes a second phase comparator for outputting a second phase difference signal corresponding to a phase difference between a signal having a frequency corresponding to a rotational speed of the motor and the input signal, an adder for adding the first and second phase difference signals, and a second smoothing filter for smoothing an output of the adder to output the smoothed signal to the motor.

Abstract: A PLL for controlling a motor includes first and second feedback loops. The first feedback loop includes an oscillator for generating a signal having a frequency corresponding to an input voltage, a first phase comparator for outputting a first phase difference signal corresponding to a phase difference between the signal from the oscillator and an input signal, and a first smoothing filter for smoothing the first phase difference signal to output the smoothed signal as the input voltage. The second feedback loop includes a second phase comparator for outputting a second phase difference signal corresponding to a phase difference between a signal having a frequency corresponding to a rotational speed of the motor and the input signal, an adder for adding the first and second phase difference signals, and a second smoothing filter for smoothing an output of the adder to output the smoothed signal to the motor.

Abstract: A seat belt retractor includes a take-up drum with webbing wound therearound, a torsion bar coupled to a first end of the take-up drum non-rotatably relative thereto, and a ratchet wheel coupled to a second end of the torsion bar non-rotatably relative thereto. The seat belt retractor further includes a deformable member provided on a second end of the take-up drum for rotating integrally therewith, an internal tooth element (8) provided non-rotatably relative to the torsion bar, and planet gears in mesh with a gear surface of the internal tooth element and in engagement with the deformable member, the planet gears being assembled non-rotatably relative to the torsion bar. The planet gears revolve around the deformable member while biting into the surface of the deformable member to plastically deform the deformable member when the webbing is paid out to cause the sun element and the internal tooth element to rotate relative to each other after an emergency locking member is locked.

Abstract: A seat belt retractor (1) includes a take-up drum (2) with webbing (6) wound therearound, a torsion bar (4) coupled to a first end of the take-up drum (2) non-rotatably relative thereto, and a ratchet wheel (5) coupled to a second end of the torsion bar (4) non-rotatably relative thereto. The seat belt retractor (1) further includes a deformable member (7) provided on a second end of the take-up drum (2) for rotating integrally therewith, an internal tooth element (8) provided non-rotatably relative to the torsion bar (4), and planet gears (13) in mesh with a gear surface of the internal tooth element (8) and in engagement with the deformable member (7), the planet gears (13) being assembled non-rotatably relative to the torsion bar (4).