US Patent: 3,586,949
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| Three-Phase Motor Control System
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Patentees:
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| Carles F. Raber (exact or similar names) - Simsbury, Hartford County, CT |
| Kenneth D. Spear (exact or similar names) - Southington, Hartford County, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 23, 1968 |
| Granted: |
Jun. 22, 1971 |
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Jeff Joslin
Vintage Machinery entry for Pratt, Whitney & Co.
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Description: |
| "This invention is directed to a three-phase DC motor drive for use in conjunction with machine tools for driving a spindle or a slide. In particular, the invention comprises a silicon controlled rectifier (SCR) assembly, utilized to permit three-phase line voltages to be applied across the armature of a DC motor. A tachometer is utilized to generate a signal indicative of the motor speed which is combined with a command signal and a current limit signal. From the combination of these signals, a signal is generated to control the firing of the SCR assembly. This invention includes the use of saturable reactors to prevent one of the SCR's of the assembly from firing while another is conducting. Also as an important feature of this invention, there is provided tachometer ripple cancellation in order to obtain a low noise output signal from the tachometer." |
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