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A manual inputting device which includes a sun gear, three planet gears, a motor having an output shaft thereof fixed to the sun gear, a ring gear casing integrally forming a ring gear on an inner peripheral surface thereof, a carrier rotated along with revolution of the planet gears, a carrier shaf

A manual inputting device which includes a sun gear, three planet gears, a motor having an output shaft thereof fixed to the sun gear, a ring gear casing integrally forming a ring gear on an inner peripheral surface thereof, a carrier rotated along with revolution of the planet gears, a carrier shaft mounted on the carrier, a restricting member facing the carrier in an opposed manner while sandwiching the planet gears therebetween, a knob fixed to the carrier shaft, a code plate integrally formed with the sun gear, a light emitting section, a light receiving section, a connector for outputting detection signals generated from the light receiving section, a board connecting these components thereto, a body casing, a bracket served for fixing the motor to the body casing, and a control unit for controlling the motor in response to detection signals from the light receiving section.

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A manual inputting device which includes a sun gear, three planet gears, a motor having an output shaft thereof fixed to the sun gear, a ring gear casing integrally forming a ring gear on an inner peripheral surface thereof, a carrier rotated along with revolution of the planet gears, a carrier shaf

A manual inputting device which includes a sun gear, three planet gears, a motor having an output shaft thereof fixed to the sun gear, a ring gear casing integrally forming a ring gear on an inner peripheral surface thereof, a carrier rotated along with revolution of the planet gears, a carrier shaft mounted on the carrier, a restricting member facing the carrier in an opposed manner while sandwiching the planet gears therebetween, a knob fixed to the carrier shaft, a code plate integrally formed with the sun gear, a light emitting section, a light receiving section, a connector for outputting detection signals generated from the light receiving section, a board connecting these components thereto, a body casing, a bracket served for fixing the motor to the body casing, and a control unit for controlling the motor in response to detection signals from the light receiving section. elements is switched; and wherein said second transient voltage is generated between an input terminal and an output terminal of each of said first switching element in said off-state, when said first plurality of switching element is switched. 2. The method of claim 1, further comprising the step of altering the switching said state of said first plurality of switching elements by said PWM control, such that the occurrence of a first maximum value of said second transient voltage is separated by more than a predetermined period from the occurrence of a first maximum value of said first transient voltage. 3. The method of claim 1, further comprising the step of preventing the switching of said state of said first plurality of switching elements by said PWM control during a predetermined time interval preceding the occurrence of a first maximum value of said second transient voltage. 4. The method of claim 1, wherein said brushless motor drives a compressor for an automotive air conditioner. 5. A method for controlling a brushless motor having an inverter providing a current to said brushless motor, said inverter comprising: a first plurality of switching elements at a first side of said inverter connected between a first terminal of a DC power source and a phase terminal of each coil of said brushless motor; a second plurality of switching elements at a second side of said investor connected between a second terminal of said power source and a phase terminal of each coil of said brushless motor; and a drive control device for selecting a state of said first plurality of switching elements and said second plurality of switching elements whereby either said state of said first plurality of switching elements or said state of said second plurality of switching elements is controlled by a pulse width modulation (PWM) control, so that said drive control device controls a rotational speed of said brushless motor; wherein said method comprising the steps of: determining whether a combined voltage of a first transient voltage and a second transient voltage exceeds a voltage limit; and altering the switching of said state of said first plurality of switching elements by said PWM control, such that said combined voltage is less than a voltage limit of said first plurality of switching elements or said second plurality of switching elements; and wherein said second transient voltage is generated between an input terminal and an output terminal of each of said second switching element in said off-state, when said state of said first plurality of switching elements is switched; and wherein said second transient voltage is generated between an input terminal and an output terminal of each of said second switching element in said off-state, when said second plurality of switching element is switched. 6. The method of claim 5, further comprising the step of altering the switching said state of said second plurality of switching elements by said PWM control, such that the occurrence of a first maximum value of said second transient voltage is separated by more than a predetermined period from the occurrence of a first maximum value of said first transient voltage. 7. The method of claim 5, further comprising the step of preventing the switching of said state of said second plurality of switching elements by said PWM control during a predetermined time interval preceding the occurrence of a first maximum value of said second transient voltage. 8. The method of claim 5, wherein said brushless motor drives a compressor for an automotive air conditioner. 9. An apparatus for controlling a brushless motor having an inverter providing a current to said brushless motor, said inverter comprising: a first plurality of switching elements at a first side of said inverter connected between a first terminal of a DC power source and a phase terminal of each coil of said brushless motor; a second plurality of switching elements at a second