Abstract: In a permanent magnet-embedded, concentrated winding motor, when a plurality of stator teeth (2a, 2b, 2c, . . . ) are divided into for example three groups (2, 3, 4) as a plurality of adjacent stator teeth having coils (6) wound around that are provided with voltage in phase are set as one group, coils are wound in opposite directions around adjacent stator teeth (2a, 2b, 2c) in the same group (2), while the relation between the angle h of a slot opening between adjacent stator teeth (2a, 2b) in the same group and the angle H of a slot opening formed between adjacent stator teeth (2a, 3c) belonging to different groups satisfies h<H≦3h.

Abstract: In a motor and a disk drive apparatus in accordance with the present invention, a position detecting part 30 comprises a detection signal switching circuit 39A, a noise elimination circuit 38 and a detection circuit 39B, and the detection signal switching circuit 39A is configured to output an inverted detection signal obtained by logically inverting a detection signal until the rotation speed reaches a predetermined rotation speed after the beginning of starting or until a position detection pulse signal FG is detected a predetermined number of times; position detection operation is carried out only during the ON operation of PWM, whereby PWM sensorless starting is carried out.

Abstract: A motor according to the present invention is a motor using a rotor 5 including two first rotator portions 2, each having a permanent magnet 1, and a second rotator portion 3 having magnetic saliency inserted therebetween, coupled in a direction of a rotating shaft 4, and part of the rotor 5 is replaced with a reluctance motor, whereby an amount of the permanent magnet 1 is reduced, thus making it possible to reduce generated voltage. Further, there are provided the first rotator portion 2 on both sides of the second rotator portion 3, whereby the second rotator portion 3 is magnetically saturated through the effective use of going-round 18 of magnetic flux to raise salient ratio. Thus, reluctance torque caused in the second rotator portion 3 is increased, whereby it is possible to increase torque as a whole and to obtain a high-output motor.

Abstract: A brushless motor has first and second power transistors which form current paths to three-phase windings so as to rotate a rotor. A position detecting part produces a position signal in response to a rotation of the rotor. An activation operation block controls active operation of the first and second power transistors in response to the position signal. The activation operation block includes a starting operation part which comprises an initial phase setting part, phase changing part and a phase correcting part. The initial phase setting part sets an initial phase of drive signals to the three-phase windings in response to the level of the position signal at the timing of a start signal. The phase changing part changes sequentially the phase of the drive signals to the three-phase windings in the positive direction in response to time.

Abstract: In a method for controlling a vehicle drive electric motor whose output torque degree is ordered in accordance with a movement of an accelerator, an actual output torque of the vehicle drive electric motor is decreased when a detected actual vehicle moving condition is not in compliance with a vehicle drive mode ordered by a vehicle operator, to less than an output torque degree of the vehicle drive electric motor ordered in accordance with an movement of the accelerator, and thereafter the actual output torque of the vehicle drive electric motor is made substantially equal to the output torque degree of the vehicle drive electric motor ordered in accordance with the movement of the accelerator after the detected actual vehicle moving condition becomes in compliance with another vehicle drive mode ordered by the vehicle operator and the output torque degree of the vehicle drive electric motor ordered in accordance with the movement of the accelerator is decreased to not more than the decreased actual output t

Abstract: A motor comprising: a rotor including a permanent magnet type rotor unit having a plurality of permanent magnets and a reluctance type rotor unit having a plurality of magnetic salient pole portions and a plurality of slits for preventing flux leakage, the rotor units being coupled to each other in an axial direction; and a stator for generating a field for driving the rotor. Elongated holes for preventing the short-circuit of magnetic fluxes are arranged near edges of the permanent magnet of the permanent magnet type rotor unit. The elongated holes or notches are arranged within a range defined so that 0.95&agr;≦&thgr;≦1.

Abstract: A motor including: a rotor including a permanent magnet type rotor unit having a plurality of permanent magnets and a reluctance type rotor unit having a plurality of salient pole portions, the rotor units being coupled to each other in an axial direction; and a stator for generating a field for driving the rotor. The permanent magnet type rotor unit and the reluctance type rotor unit are given an angle deviation therebetween in the direction of rotation to obtain desired torque characteristics. The reluctance type rotor unit has slits for preventing flux leakage from the permanent magnets. The slits are formed with the angle deviation in the direction of rotation from respective positions symmetric about a center of the salient pole portions. Flux leakage is thus prevented to avoid deterioration in characteristics.

Abstract: A motor according to the present invention is a motor using a rotor 5 including two first rotator portions 2, each having a permanent magnet 1, and a second rotator portion 3 having magnetic saliency inserted therebetween, coupled in a direction of a rotating shaft 4, and part of the rotor 5 is replaced with a reluctance motor, whereby an amount of the permanent magnet 1 is reduced, thus making it possible to reduce generated voltage. Further, there are provided the first rotator portion 2 on both sides of the second rotator portion 3, whereby the second rotator portion 3 is magnetically saturated through the effective use of going-round 18 of magnetic flux to raise salient ratio. Thus, reluctance torque caused in the second rotator portion 3 is increased, whereby it is possible to increase torque as a whole and to obtain a high-output motor.

Abstract: A motor controller comprising drive unit for supplying power to the stator windings of a motor based on a current command, a stator current detection unit for detecting the stator current flowing in the stator windings, a saturation degree production unit for producing the saturation degree data indicating the extent to which the stator current deviates from the current command based on the current command and the stator current, a reference value production unit for producing a reference value of the saturation degree, a gain production unit for producing a gain indicating the rate at which the current command is changed, and a current command production unit for producing the current command data based on the saturation degree, the reference value and the gain, wherein the gain production unit produces the gain data based on at least one of the rotational speed of the motor and the current command.

Abstract: A motor controller comprises a stator current production unit for producing stator current commands that are command values for the stator current flowing through the stator windings, a drive unit for supplying electric power to the stator windings based on the stator current commands, a stator current detection unit ZU, ZV, and ZW, for detecting the stator currents flowing through the stator windings, and a saturation degree production unit for producing a saturation degree indicating by how much the stator current is not following the stator current command. The stator current production unit produces the stator current commands based on the saturation degree. The saturation degree production unit produces the saturation degree based on the current commands, the stator current signals, and the pole-position signals.

Abstract: By processing in a control processor 71 signal indicating the amount or degree of pushing-down of the accelerator pedal 2a and signals indicating the non pushing down and full pushing-down of the acceleration pedal 2a, the control unit 7 executes the judgment for determining whether the detected accelerator state is normal or anomalous. In case of judgment of "normal", a usual motor control is executed, whereas in case of judgment to be "anomaly", the system is tentatively designated to be "a state under which the anomaly is being detected". After a specified time lapse, a rejudgement operation is executed, and further when the anomaly is not solved even in this rejudgement operation, the situation is regarded to be a "real anomaly", and an anomaly procedure e.g. to stop current to the motor is executed. When the anomaly state is solved in the rejudgement operation, it is judged to be normal again.