Abstract: The present invention restrains high frequency leakage current while reducing ripples of current flowing through a motor having one set and another set of independent phase windings. A plurality of inverter type drive means drives the respective phase windings and a PWM control means controls the respective inverter type drive means, by a switching sequence connecting one end of all phase windings including the other set to the negative side of the power supply when both ends of the phase winding included in one set are connected to the positive side of the power supply and connecting at least one end of all phase windings included in the other set to the positive side of the power supply when both ends of at least one phase winding included in one set are connected to the negative side of the power supply.

Abstract: A control device for a stepping motor is provided that can reduce torque generated by a motor and control the expansion of a speed deviation when the rotational speed of a rotor exceeds a speed command. The control device includes first judging means (27) for judging whether a positional deviation of a rotor is within a predetermined range, second judging means (28) for judging whether a sign of the positional deviation and a sign of a speed deviation coincide with each other, and phase setting means (34 to 35) for setting a winding current command phase.

Abstract: The present invention restrains high frequency leakage current while reducing ripples of current flowing through a motor having one set and another set of independent phase windings. A plurality of inverter type drive means drives the respective phase windings and a PWM control means controls the respective inverter type drive means, by a switching sequence connecting one end of all phase windings including the other set to the negative side of the power supply when both ends of the phase winding included in one set are connected to the positive side of the power supply and connecting at least one end of all phase windings included in the other set to the positive side of the power supply when both ends of at least one phase winding included in one set are connected to the negative side of the power supply.

Abstract: A control device for a stepping motor is provided that can reduce torque generated by a motor and control the expansion of a speed deviation when the rotational speed of a rotor exceeds a speed command. The control device includes first judging means (27) for judging whether a positional deviation of a rotor is within a predetermined range, second judging means (28) for judging whether a sign of the positional deviation and a sign of a speed deviation coincide with each other, and phase setting means (34 to 35) for setting a winding current command phase.

Abstract: In a member having spring properties, such as a slider for a slide fastener or a snap button, the member main unit is composed of copper or a copper-based alloy, and the spring member attached to the member main unit is also composed of copper or a copper-based alloy. This eliminates the trouble of having to separate the structural components when recycling copper and also allows regenerated ingots to be readily prepared through a remelting process, thereby lowering recycling costs.

Abstract: The heat-generating components of an integrated motor system are disposed proximate the motor body, for efficient heat dissipation, and the heat-sensitive components are segregated therefrom, physically and thermally.

Abstract: The heat-generating components of an integrated motor system are disposed proximate the motor body, for efficient heat dissipation, and the heat-sensitive components are segregated therefrom, physically and thermally.

Abstract: An object of the present invention is to provide a construction of a motor with a built-in sensor, in which the total length of the motor is not increased, and can be made approximately equal to the total length of the conventional motor which has no built-in sensor. To achieve this object, in a motor 1 comprising a rotor 3 having rotor cores 6a and 6b and a stator 2 in which windings 5 are wound on a stator core 4 to form a rotational magnetic field, a substantially cylindrical recess 21 with a diameter smaller than the outside diameter of the rotor 3 is formed at the end face portion of the rotor core 6a, 6b, and in a space 22 which communicates with the recess 21, including the recess 21, and reaches the end face of the windings 5 of the stator 2, a part of a motor frame 11 to which a bearing 9 for rotatably supporting a rotor shaft 7 while passing through it is fitted and a sensor 23, on the outside of the bearing 9, for detecting the position or speed of the motor 1 are disposed.

Abstract: Disclosed is a control apparatus for a position control motor, which allows the rotor of the motor to follow up to a command position without step out, can ensure highly reliable positioning, and is stable with respect to a variation in load. This position control apparatus comprises a position detecting section for detecting a rotor position of the position control motor, a control section for comparing an output signal of the position detecting section with a command position signal and outputting a signal corresponding to an electric current to flow in windings of the motor based on a deviation between the output signal and the command position signal, and a drive section for outputting an electric current to be supplied to the windings of the motor based on an output signal of the control section, and controls the position of the motor based on the command position signal.