Abstract: To provide a power supply apparatus having high control resolution of an output power. A PWM signal generating circuit includes: a non-inverting element 31, and an inverting element 32; and further includes a counter 11 for performing count operation in response to rising of a clock signal, a counter 12 for performing count operation in response to falling of the clock signal, comparison circuits 21, 22, and a multiplexer 20. These circuit elements are controlled by PWM control means 10. As another circuit element, the PWM signal generating circuit includes a logical sum element 33. The PWM signal generating circuit serves to arbitrarily change both period and logic “H” time of a PWM signal to be outputted at a time interval which is one half of the clock period. Thus, there is provided a power supply apparatus in which resolution of a PWM signal has been improved within a broad duty range, and fine control of an output power has been performed within a broad output power range.

Abstract: To provide a power supply apparatus having high control resolution of an output power. A PWM signal generating circuit includes: a non-inverting element 31, and an inverting element 32; and further includes a counter 11 for performing count operation in response to rising of a clock signal, a counter 12 for performing count operation in response to falling of the clock signal, comparison circuits 21, 22, and a multiplexer 20. These circuit elements are controlled by PWM control means 10. As another circuit element, the PWM signal generating circuit includes a logical sum element 33. The PWM signal generating circuit serves to arbitrarily change both period and logic “H” time of a PWM signal to be outputted at a time interval which is one half of the clock period. Thus, there is provided a power supply apparatus in which resolution of a PWM signal has been improved within a broad duty range, and fine control of an output power has been performed within a broad output power range.

Abstract: The invention provides an electric motor in which a cost is reduced by reducing a number of the parts, and an electric motor in which a freedom of placement is increased. A motor assembly has a yoke and a front bracket closing an open end of the yoke. The front bracket is formed in a closed-end cylindrical shape by an aluminum die casting, and a brush holder for holding a brush is received in an inner portion. A motor controller for controlling the motor assembly is formed as an electronic circuit having a communication portion, a control portion and a driver portion, and this electronic circuit is mounted on an inner peripheral surface of the front bracket. Further, the electronic circuit constituting the motor controller may be mounted on the brush holder.

Abstract: The invention provides an electric motor in which a cost is reduced by reducing a number of the parts, and an electric motor in which a freedom of placement is increased. A motor assembly has a yoke and a front bracket closing an open end of the yoke. The front bracket is formed in a closed-end cylindrical shape by an aluminum die casting, and a brush holder for holding a brush is received in an inner portion. A motor controller for controlling the motor assembly is formed as an electronic circuit having a communication portion, a control portion and a driver portion, and this electronic circuit is mounted on an inner peripheral surface of the front bracket. Further, the electronic circuit constituting the motor controller may be mounted on the brush holder.

Abstract: In an electric motor comprising a cylindrical yoke having a side wall at one end portion thereof, a driver unit for controlling and driving the electric motor is contained at an end portion in the side of the side wall in the yoke. A power supply opening portion through which inside and outside of the yoke communicate with each other and a signal line opening portion are formed in the side wall, and an electric connection to the driver unit is made through these portions. The driver unit is provided inside the yoke with FETs thereof kept in direct contact with the side wall. Also, a driver unit which integrates drive control circuitry with a brush holder may be provided and fixed on the outer surface of the side wall. In this case, an opening portion through which inside and outside of the yoke communicate with each other is formed in the side wall, and a brush is inserted through these portions. A driver unit is attached to a yoke with FETs thereof kept in direct contact with the side wall.

Abstract: A probe system according to the present invention has a plurality of exploration portions disposed in a line, spaced apart from one another for predetermined distances and each having a test head, for establishing electrical connection between the test head and electrodes of a subject of exploration so as to explore electrical characteristics of the subject of exploration, a conveyance passage running parallel to the line of the exploration portions, a retainer portion on which a plurality of the subjects of exploration are placed, which is facing to the conveyance passage and which is capable of elevating vertical with respect to the conveyance passage at a position above the conveyance passage, and delivery and acceptance unit arranged capable of moving along the conveyance passage and arranged to deliver and accept the subjects of exploration between the retainer portion and each of the exploration portions.

Abstract: Disclosed is an electric motor system for automobiles having an electric motor and a control circuit for the motor, wherein the control circuit is attached to a part of a metallic housing of the motor system by means of a bonding agent and is embedded in resin material so as to maintain a favorable heat removal from the control circuit by virtue of a high heat conductivity and a heat radiation capability of the housing. Preferably, the housing accommodates a speed reduction unit which is connected to the output shaft of the motor and reduces its rotation speed. Favorable heat removal from the control circuit improves the reliability and the performance of the control circuit, and since the control circuit can be directly wired to the motor the number and the cross section of the electric wires which extend between various parts of the motor system can be reduced.