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Motor and drive control system thereofMotor and drive control system thereof description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070188121, Motor and drive control system thereof. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional patent application of U.S. Ser. No. 11/445,396 filed Jun. 1, 2006 which is a divisional of U.S. Ser. No. 11/078,960 filed Mar. 11, 2005 which is now U.S. Pat. No. 7,095,155 issued Aug. 22, 2006, claiming priority to Japanese Patent Application No. 2004-071417 filed Mar. 12, 2004, all of which are hereby expressly incorporated by reference. FIELD OF THE INVENTION [0002] The present invention relates to various motors constituted to rotate a rotor or move a slider formed from a permanent magnet or ferromagnetic material by linearly arranging coils that generate magnetic poles and sequentially switching the current to be applied to the coil, a magnetic structure to be employed in such a motor, and a power driver employing this motor as its drive source. The present invention may be employed in the likes of an electric vehicle, electric cart and electric wheelchair, as well as an electric toy, electric airplane, small electronic appliances and MEMS as the foregoing power driver. DESCRIPTION OF THE RELATED ART [0003] An AC motor driven with a frequency signal such as an alternating current can be broadly classified into two types; namely, a synchronous motor and an induction motor. A synchronous motor is a motor that uses a layered core of a permanent magnet or a ferromagnetic material such as iron in the rotor, and rotates at a rotation speed that is the same as the speed of the rotating magnetic field determined based on the power supply frequency. [0004] Depending on the type of rotor, there are various types of motors such as a magnetic type which uses a permanent magnet, a coil type with a coil wound thereto, and a reactance type which uses a ferromagnetic material such as iron. Among the above, with the magnetic type motor rotates by the permanent magnet of the rotor being pulled with the rotating magnetic field of the stator. Meanwhile, the induction motor is a motor that rotates by generating a separate magnetic field with the electromagnetic induction effect to a rotor having a box-shaped conduction wire. [0005] Among the foregoing motors, there is a motor that does not rotate, but rather moves linearly or moves freely on a flat surface. This kind of motor is generally referred to as a linear motor, and moves the permanent magnet or ferromagnetic material mounted thereon by linearly arranging coils that generate magnetic poles and sequentially switching the current to be applied to the coil. The linearly disposed coil array is the stator, and the rotor corresponds to a flat slider that slides thereabove. [0006] As a magnetic synchronous motor, for instance, there is a small synchronous motor described in the gazette of Japanese Patent Laid-Open Publication No. H8-51745 (Patent Document 1). This small synchronous motor, as shown in FIG. 1 of Patent Document 1, is constituted by comprising a stator core 6 wound with an excitation coil 7, and a rotor 3 having a rotor core 2 having a magnet 1 build therein and in which the NS poles are aligned in even intervals around the peripheral face thereof. SUMMARY OF THE INVENTION [0007] Nevertheless, with the motor explained in the description of the related art, the weight became massive in comparison to the generated torque, and there is a problem in that the motor would become enlarged when attempting to increase the generated torque. Thus, an object of the present invention is to provide a motor suitable for miniaturization and superior in torque and weight balance. [0008] In order to achieve the foregoing object, the present invention provides a motor drive system comprising a movable body and a plurality of electromagnetic coils in which the plurality of electromagnetic coils is disposed as a stator in a non-contact manner on the movable body to which a plurality of permanent magnets alternately magnetized at opposite poles is continuously disposed thereon, and the movable body is capable of moving based on the attraction--repulsion between the movable body and electromagnetic coils generated by supplying an excitation current as a direct drive waveform to the electromagnetic coils; wherein a sensor for detecting the periodical magnetic field change caused by the movement of the permanent magnet is provided, and the output of the sensor is directly supplied as the excitation current to the electromagnetic coils. [0009] In a preferred embodiment of the present invention, the movable body is constituted to have a plurality of constitutions in which the hetropolar arrangement of two different permanent magnets constitutes a pair, and, when the position between the hetropolar arrangement constituting a pair is 2.pi., the sensor is able to linearly detect the arbitrary position between the 2.pi., and the sensor is provided to the electromagnetic coil phase. [0010] Also provided is a motor drive system provided with a movable body constituted to have a plurality of constitutions in which the hetropolar arrangement of permanent magnets constitutes a pair, in which the position between the hetropolar arrangement constituting a pair is set to 2.pi., and the movable body is moved based on the attraction--repulsion with non-contact electromagnetic coils; wherein the sensor is able to linearly detect the arbitrary position between the 2.pi., and the sensor is provided to the electromagnetic coil phase. The arbitrary position signal level obtained from the sensor corresponding to the electromagnetic coil phase is returned to the electromagnetic coils. [0011] The present invention also provides a motor comprising magnetic polar means in which a permanent magnetic polar array having arranged therein alternately a plurality of permanent magnetic polar elements in alternate opposite poles is made to face a plurality of electromagnetic coil arrays alternately excited at opposite poles, and the permanent magnetic polar array is made to move thereby; wherein the motor further comprises a sensor for detecting the periodical magnetic change accompanying the movement of the permanent magnetic polar array, and the output of the sensor is directly returned to the electromagnetic coils. In a more detailed embodiment of the present invention, the coil array is formed from a two-phase pair of A and B phases, the permanent magnetic polar array is interposed between the A and B phases, A and B phases shift the phase for establishing the coil, a sensor for the A phase coil and a sensor for the B phase coil are provided, and the phase for establishing the A phase coil sensor and the B phase coil sensor is shifted. A plurality of patterns of excitation signals is supplied respectively to the A phase coil and the B phase coil. Regardless of at which position the permanent magnetic polar array is stopped, at least one signal among the plurality of patterns of excitation signals is set to be the excitation state based on the output from the A phase sensor and the B phase sensor. The sensor is a hall element sensor for outputting an analog detection value. PWM control is added to the sensor output value based on the drive request torque of the motor, and the control signal is supplied to the excitation coils. [0012] The present invention further provides a motor regenerative drive system to be used in the regeneration of the motor, wherein provided is regeneration control means for controlling the regeneration based on the sensor signal, and the control means has means for forming a regenerative enabling signal from the sensor signal, means for controlling the duty of the regenerative enabling signal based on the load status, and means for arbitrarily controlling the regeneration of the motor based on the duty. BRIEF DESCRIPTION OF THE DRAWINGS [0013] FIG. 1 is a diagram showing the frame format and principle of operation of the magnetic structure pertaining to the present invention; [0014] FIG. 2 is a diagram showing the principal of operation subsequent to FIG. 1; [0015] FIG. 3 is an equivalent circuit diagram showing the connection state of the electromagnetic coils; [0016] FIG. 4 is a perspective view of the motor; [0017] FIG. 5 is a block diagram of the drive circuit for supplying an excitation signal to a coil array; [0018] FIG. 6 is a control circuit block diagram for returning the digital output of the sensor directly to the coil drive circuit; [0019] FIG. 7 is the control waveform diagram thereof; Continue reading about Motor and drive control system thereof... 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