Elevator car position detection sensor that determines a phase of an alternating-current voltage corresponding to a frequency of an excitation magnetic field

An elevator car position detection sensor comprising:

• a first coil provided to one of an elevator car and a hoistway and configured to output an excitation magnetic field to a plate provided to the other of the elevator car and the hoistway;
• a second coil provided on an opposite side of the first coil relative to the plate;
• a shield wall configured to shield an end portion of the plate located closer to one of the car and the hoistway;
• and
• a determination circuit configured to determine a phase of an alternating-current voltage corresponding to a frequency of the excitation magnetic field output from the first coil at an alternating-current voltage generated across the second coil, wherein
• the shield wall shields an end portion of the plate located closer to one of the car and the hoistway at a side closer to a tip end of the plate and at a side closer to second coil, without shielding the end portion of the plate at a side closer to the first coil.

An elevator car position detection sensor comprising:

• a first coil provided to one of an elevator car and a hoistway and configured to output an excitation magnetic field to a plate provided to the other of the elevator car and the hoistway;
• a second coil provided on an opposite side of the first coil relative to the plate;
• a shield wall configured to shield an end portion of the plate located closer to one of the car and the hoistway;
• and
• a determination circuit configured to determine a phase of an alternating-current voltage corresponding to a frequency of the excitation magnetic field output from the first coil at an alternating-current voltage generated across the second coil, wherein
• the shield wall shields an end portion of the plate located closer to one of the car and the hoistway at a side closer to a tip end of the plate, without shielding the end portion of the plate at a side closer to the first coil and at a side closer to the second coil.