Abstract: A caging system for a magnetized rotor of a gyro. A capacitive detector dcts amounts of linear deflection of the rotor, from an upright position, over time. A computer calculates the linear deflection velocity of the rotor. A power supply sends an amount of current to an electromagnetic coil dependent on the amount of linear deflection velocity of the rotor. An electromagnetic field from the electromagnetic coil moves the rotor to an upright position.

Abstract: A system for increasing the power delivered to a brushless dc or induction motor from a sinusoidal motor drive by maximizing the dynamic range available to the motor winding excitation signals. According to one embodiment of the invention, sinusoidal excitation currents are applied to all but one of the primary windings of a brushless dc or induction motor. A variable voltage drive is applied to the one remaining winding. The voltage drive maximizes the dynamic range available to the sinusoidal excitation currents by selecting the voltage applied to that one remaining winding to be the difference between one half the dc source voltage and the instantaneous average of the highest and lowest of the motor terminal voltages.

Abstract: A protective circuit for protecting electrical equipment. The circuit has a eat sensor for sensing heat from the electrical equipment, an amplifier for amplifying the sensor voltage. The circuit also has a power supply, a heater, and drive transistor for conducting current from the power supply to the heater due to amplified sensor voltage on the drive transistor. The circuit further has a heat sensitive switch that has a switching temperature. The heat sensitive switch is between another power supply, for the electrical equipment, and the electrical equipment. The heat sensitive switch initially conducts electrical power to the electrical equipment. The switch will interrupt electrical power to the electrical equipment, after a selected rate of heat from the electrical equipment activates the circuit to cause the heater to produce a switching heat. This switching heat from the heater raises the temperature of the heat sensitive switch above its switching temperature.