Abstract A variable reluctance resolver comprises a rotor core and stator magnetic poles structured to enable reluctance in the space between the rotor core and stator magnetic poles to be changed by the positions of the rotor core and to make the fundamental wave component of the reluctance variation N cycles per revolution of the rotor core, N being an integer of 1 or more; first magnetic poles having a predetermined number 3N phases arranged at equal intervals on the stator magnetic poles; second magnetic poles having a predetermined number of 3N phases formed in the central positions between the first magnetic poles; excitation coils arranged individually between the first and second magnetic poles and connected in series to each other for each phase of the magnetic poles; a current change detecting device for detecting current value change due to the variation of the reluctance when an alternating current is applied to the magnetic coils of each phase of the magnetic poles; 3N difference value calculating devices for calculating the difference values between the detected current values of the first magnetic poles and second magnetic poles of each phase detected by the current change detecting device; a phase converting device for converting the output of the difference value of the difference value calculating device into a 2N-phase; and a signal processing device for calculating rotational angles or rotational speeds on the basis of the converted outputs of the phase converting device.
A variable reluctance resolver comprising: a rotor core and stator magnetic poles structured to enable reluctance in a space between the rotor core and stator magnetic poles to be changed by the positions of the rotor core and to make a fundamental wave component of the reluctance variation N cycles per revolution of the rotor core, N being an integer of 1 or more; said stator magnetic poles including first magnetic poles having a predetermined number of 3N phases and arranged at equal intervals; said stator magnetic poles further including second magnetic poles having a predetermined number of 3N phases and disposed at the central positions between said first magnetic poles; excitation coils arranged individually at said first and second magnetic poles and connected in series to each other for each phase of said first magnetic poles and for each phase of said second magnetic poles; current detecting means for detecting current values changing due to the variation of the reluctance when an alternating current is applied to the magnetic coils of each phase of said first magnetic poles and said second magnetic poles; 3N difference value calculating means for calculating the difference values between the detected current values of said first magnetic poles and second magnetic poles of each phase detected by said current detecting means; phase converting means for converting outputs of the difference values from said difference value calculating means into a 2N-phase output; and signal processing means for calculating rotational angles or rotational speeds on the basis of the converted output of said phase converting means.
Claim 2
Dependent Claim
260 words
A variable reluctance resolver comprising: a rotor core and stator magnetic poles structured to enable reluctance in a space between the rotor core and stator magnetic poles to be changed by the positions of the rotor core and to make a fundamental wave component of the reluctance variation N cycles per revolution of the rotor core, N being an integer of 1 or more; said stator magnetic poles including first magnetic poles having a predetermined number of 3N phases and arranged at equal intervals; said stator magnetic poles further including second magnetic poles having a predetermined number of 3N phases and disposed at the central positions between said first magnetic poles; excitation coils arranged individually at said first and second magnetic poles and connected in series to each other for each phase of said first magnetic poles and for each phase of said second magnetic poles; current detecting means for detecting current values changing due to the variation of the reluctance when an alternating current is applied to the magnetic coils of each phase of said first magnetic poles and said second magnetic poles; 3N difference value calculating means for calculating the difference values between the detected current values of said first magnetic poles and second magnetic poles of each phase detected by said current detecting means; phase converting means for converting outputs of the difference values from said difference value calculating means into a 2N-phase output; and signal processing means for calculating rotational angles or rotational speeds on the basis of the converted output of said phase converting means.