Abstract:
The brushless motor has a first and second drive member. The first drive member is equipped with M phase coil groups each having N electromagnetic coils where M is an integer of 1 or greater and N is an integer of 1 or greater. The second drive member has a plurality of permanent magnets, and is able to move relative to the first drive member. The first drive member has 2 (M×N) magnetic body cores. Each phase electromagnetic coil is coiled on a periodically selected magnetic body core at a ratio of 1 to 2M from among the arrangement of 2 (M×N) magnetic body cores.
Abstract:
A clock signal generator including: a signal generation unit that outputs a first clock signal composed of a single frequency component; and a phase angle detection unit that detects phase angles of the first clock signal by comparing a plurality of threshold values set within the amplitude of the first clock signal with instantaneous values of the first clock signal by using window comparators, and generates a second clock signal by determining rising and/or falling edges of the signal according to the detected phase angles.
Abstract:
A sawtooth wave generating apparatus includes a base frequency generating section and a frequency generating section for generating the frequency of a reference signal, a sawtooth wave forming section which forms a sawtooth wave based on the reference signal, a voltage comparator which compares the voltage value of the sawtooth wave formed by the sawtooth wave forming section with a predetermined voltage value, a phase comparator which compares the phase of the output signal from the voltage comparator with the phase of the reference signal, and a low-pass filter (LPF) which cuts out a high frequency component of the output signal from the phase comparator, and feeds back the resulting output signal to the sawtooth wave forming section.
Abstract:
A PWM control system, comprising PWM fundamental wave generation means for forming a PWM fundamental wave by dividing a fundamental frequency signal; PWM cycle setting means for setting a PWM cycle on the basis of the PWM fundamental wave; duty ratio formation means for forming a duty ratio (N/M:N≦M, where M is the maximum number of clocks) in the PWM cycle; and PWM control signal output means for outputting a PWM control signal with the duty ratio to a load drive circuit.
Abstract:
Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control system having a drive source with an electric motor, a drivee, a control circuit having a drive control circuit of the motor and a regenerative control circuit, and a detection unit for detecting the driving status of the drivee, the drive control circuit and regenerative control circuit have a control unit for controlling, linearly or in multiple stages, the duty ratio of the drive or regenerative signal to be supplied to the motor based on the phase difference of the phase of the detection signal from the detection unit and the command value signal to the motor.
Abstract:
A discharge lamp controlling apparatus includes a detector for detecting a discharge condition of a discharge lamp; a frequency changing unit for gradually changing a frequency of a voltage to be applied to the discharge lamp until the discharge condition reaches a predetermined lighting condition; and a voltage controller for controlling the voltage to be applied to the discharge lamp on the basis of the frequency changed by the frequency changing unit.
Abstract:
In the moving image display device of the invention, a synthesis circuit inputs signals representing specified values of pixel rate factors R2 and R3 from a pixel rate factor specification circuit, while inputting overscanned frame image data D1 in the units of pixels from a 1st latch circuit. The synthesis circuit extracts a preset number of pixels corresponding to the specified value of the pixel rate factor R2 from a prior frame image, while extracting a preset number of pixels corresponding to the specified value of the pixel rate factor R3 from a latter frame image. The positions of pixels to be extracted from the latter frame image are complementary to the positions of pixels to be extracted from the prior frame image. The synthesis circuit combines the extracted pixels of the prior frame image with the extracted pixels of the latter frame image by a logical OR operation to generate intermediate frame image data D2. This technique of the invention is significantly simpler than the prior art technique but still effectively prevents flicker in a moving image to ensure smooth display of the moving image.
Abstract:
An optical diaphragm for adjusting a light quantity of an incident light beam includes: a base plate extending along a plane orthogonal to an optical axis of the light beam, the base plate having an aperture for transmitting the light beam; a plurality of light-shielding vanes attached to a circumferential portion of the aperture of the base plate in a manner rotatable along the plane orthogonal to the optical axis of the light beam, the light-shielding being rotated to change an aperture area of the aperture for transmitting the light beam to adjust the light quantity of the light beam; a vane holder for pressing the plurality of light-shielding vanes to the base plate in a manner that the light-shielding vanes are rotatable; a plurality of rotary shafts fixed between the base plate and the vane holder, the rotary shafts each rotatably supporting each of the plurality of light-shielding vanes; and a vane-driving mechanism movably attached to the base plate and engaged with the plurality of light-shielding vanes, the vane-driving mechanism moving relative to the base plate to rotate the plurality of light-shielding vanes. The plurality of light-shielding vanes each include a vane plate for intercepting the incident light beam; and a bearing integrally provided to the vane plate, the bearing each allowing each of the rotary shafts to be inserted therein so as to be supported by each of the rotary shafts. The vane plate is perpendicularly attached to the bearing. The plurality of light-shielding vanes move in parallel to each other in an opening and closing direction thereof without crossing with each other.
Abstract:
A wind-powered brake system which is operated to brake a movable body when a driving force of a driving source for moving the movable body should be decreased, is described. The object of the present invention is to assist normal braking, to reduce a heat energy loss, and to perform braking suitable for a necessary braking force.A wind tunnel 34 is installed in each armrest 16 of a wheelchair 10. In braking, a load for generating power is put on rotary vanes 40 provided in the wind tunnel 34. Thus, the flow of wind is obstructed, and this functions as a braking force. It is thus possible to brake the wheelchair 10 using a combination of a brake mechanism of an electric motor and a wind-powered brake system. The burden on the brake mechanism of the electric motor can be lessened, and early wear and performance degradation due to frictional heat can be suppressed. By assisting the brake function of the electric motor, the amount of heat energy released from the electric motor into the air can be reduced. The generated power can be utilized to charge a battery 32, and the continuous mileage of the wheelchair 10 can be increased.
Abstract:
The electric machine of the present invention comprises a first coil group containing a plurality of coils and a magnet group. The first coil group is classified into M phase sub coil groups, with the coils of the sub coil groups aligned one at a time in sequence at a specified sub coil group interval Dc from the first phase sub coil group to the M-th phase sub coil group. A sub coil group interval Dc is set to a value of K/M times a magnetic pole pitch Pm (K is a positive integer excluding an integral multiple of M) where the distance corresponding to an electrical angle of π is defined as the magnetic pole pitch Pm. The adjacent sub coil groups are driven at a (K/M)π phase difference. Each coil have substantially no magnetic material core.