Wireless sensor and machine tool including the same

A wireless sensor being wirelessly powered and being applicable to a machine tool that includes a shaft and a bearing sleeved on the shaft, said wireless sensor comprising:

• a wireless power module configured
• to receive a microwave pulse signal,
• to generate electrical energy according to the microwave pulse signal, and
• to supply the electrical energy to said wireless sensor;
• a sensor module configured to sense states of the shaft and the bearing of the machine tool for generating a sensor output, the sensor output including a first sensor signal that is associated with a torque of the shaft, a second sensor signal that is associated with a displacement of the shaft, a third sensor signal that is associated with vibration of the shaft, and a fourth sensor signal that is associated with a temperature of the bearing;
• an analog-to-digital converter (ADC) module electrically connected to said sensor module for receiving the first, second, third and fourth sensor signals, and configured
• to be activated in response to receipt of an enable signal for converting the first, second, third and fourth sensor signals respectively to first, second, third and fourth digital signals and for outputting the first, second, third and fourth digital signals, and
• to be deactivated in response to receipt of a disable signal;
• a wireless transceiver module to operate in a receiving state by default, and configured
• to switch from the receiving state to a transmitting state in response to receipt of a switching signal, and from the transmitting state back to the receiving state after a predetermined period has elapsed,
• to receive wirelessly a radio frequency (RF) input signal when said wireless transceiver module operates in the receiving state, and
• to generate, according to the RF input signal, a first control signal for output;
• and
• a processing module electrically connected to said ADC module and to said wireless transceiver module, and configured
• to generate the enable signal when receiving the first control signal from said wireless transceiver module,
• to output the enable signal to said ADC module for activating said ADC module to generate the first, second, third and fourth digital signals and to output the first, second, third and fourth digital signals to said processing module,
• to generate the disable signal and the switching signal when receiving the first, second, third and fourth digital signals from said ADC module,
• to output the disable signal and the switching signal respectively to said ADC module and said wireless transceiver module for deactivating said ADC module and for enabling said wireless transceiver module to operate in the transmitting state,
• to generate, according to the first, second, third and fourth digital signals, an encoded signal, and
• to output the encoded signal to said wireless transceiver module for enabling said wireless transceiver module to transmit wirelessly, according to the encoded signal from said processing module, an RF output signal which is associated with the sensor output.