Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1991-03-14
1993-07-27
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, F02P 800
Patent
active
052313425
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stepping motor used as a driving source for stepping movement of automatic-machine members.
2. Description of the Related Art
Though a stepping motor using a magnet rotor is already known in the art, it has disadvantages of small output torque and stepping speed.
When increasing the output torque, the stepping speed decreases. To perform the specified operation stepping at a high speed without outstepping, the prior art slowly increases the frequency of the stepping electric signal and slowly decreases it to step. However, the prior art has many problems including that the electric circuit is complicated and expensive and it is difficult to obtain a satisfactory performance.
For one stepping operation, one exciting coil is turned off, the accumulated magnetic energy is discharged, and magnetic energy is accumulated when the next exciting coil is turned on. Discharge and accumulation of the magnetic energy requires time. For a large output torque, the stepping time increases and high-speed stepping is impossible because large magnetic energy is accumulated.
To avoid the above-mentioned disadvantage, means is provided to execute high-speed stepping by raising the applied voltage to quickly accumulate magnetic energy and returning the accumulated magnetic energy to the power source to quickly decrease it. However, the means has the following two disadvantages. First, the means cannot be used under a low voltage because the applied voltage is too high.
Secondly, because the means is limited to high-speed stepping, it is impossible to achieve a higher-speed stepping operation.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a stepping motor having a large output torque and having a simplified circuit configuration capable of performing the specified stepping operation at a high speed without outstepping.
The present invention is a reluctance-type motor comprising an n-phase (n=2, 3, 4, . . . ) full-wave rotor having salient poles, n-phase exciting coils installed on n-phase magnetic poles, semiconductor switching devices connected to both sides of the first, second, third, . . . , and n-th phase exciting coils configured into the first and first-bar exciting coils, the second and second-bar exciting coils, the third and third-bar exciting coils, . . . , and n-th bar exciting coils, respectively, diodes inversely connected to a serially-connected body of the exciting coils corresponding to the semiconductor switching devices, a DC power source for apply voltage to the exciting coils through the semiconductor switching devices, the first and first-bar exciting coils excited by the first backflow-preventive diode connected to the positive pole of the DC power source in the forward direction, an excitation control circuit consisting of the second and second-bar exciting coils, the third and third-bar exciting coils, . . . , and n-th and n-th-bar exciting coils respectively excited by the similarly-connected second, third, . . . , and n-th backflow-preventive diodes, a specified-frequency n-phase full-wave stepping electric-signal generator, and an electric circuit to generate stepping torque by electrifying the semiconductor switching devices respectively connected to the first, second, third, . . . , and n-th phase exciting coils by the stepping electric signal. Furthermore, the present invention is a reluctance-type stepping motor.
The reluctance-type stepping motor of the present invention comprises an n-phase (n=3, 4, 5, . . . ) half-wave rotor having salient poles, n-phase exciting coils installed on n-phase magnetic poles, semiconductor switching devices connected to both sides of the first, second, third, . . . , and n-th phase exciting coils respectively configured into the first, second, third, . . . , and n-th exciting coils, diodes inversely connected to a serially-connected body of the exciting coils corresponding to the semiconductor switching devices, a DC power source apply voltage t
REFERENCES:
patent: 4477757 (1984-10-01), Palombo et al.
patent: 4533861 (1985-08-01), Rogers et al.
patent: 4757247 (1988-07-01), Ranger
patent: 4896088 (1990-01-01), Jahns
patent: 5012171 (1991-04-01), Sember
Kabushikigaisha Sekogiken
Masih Karen
Shoop Jr. William M.
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