Motor application apparatus and control method thereof

1. A motor application apparatus, comprising:

a motor;

a cooling device;

and

a microcontroller configured to output a control signal to control rotation of the motor and acquire a current and a rotation speed of the motor in real time,

wherein the microcontroller outputs a first protection signal to start the cooling device when a power loss of the motor is larger than a predetermined power loss and the rotation speed of the motor is lower than a predetermined rotation speed simultaneously; and the power loss of the motor is calculated according to a torque, an efficiency and a rotation speed;

a temperature sensor to detect a temperature of the motor;

a cooling control circuit which comprises a comparator and an OR gate, wherein a first input end of the comparator is directly connected to the temperature sensor, an output end of the comparator is directly connected to a first input end of the OR gate, an output end of the OR gate is directly coupled with the cooling device.

2. The motor application apparatus of claim 1 , wherein when the temperature of the motor is higher than a predetermined value, the cooling device is controlled to start by a second protection signal.

3. The motor application apparatus of claim 1 , wherein the cooling device is a cooling fan.

4. The motor application apparatus of claim 1 , further comprising a speed sensor to output a rotation speed detection signal to the microcontroller.

5. The motor application apparatus of claim 1 , wherein the microcontroller comprises a cooling control module calculating the power loss of the motor according to a characteristic curve of parameters of the motor.

6. The motor application apparatus of claim 2 , the comparator directly outputs the second protection signal to the OR gate when a voltage value of a temperature detection signal outputted by the temperature sensor is larger than a predetermined value.

7. The motor application apparatus of claim 4 , wherein the speed sensor is a Hall sensor.

8. The motor application apparatus of claim 5 , wherein the parameter comprises the torque, the efficiency and the rotation speed.

9. The motor application apparatus of claim 6 , wherein:

the cooling control circuit further comprises a voltage division branch;

the first input end of the comparator receives a temperature detection signal outputted by the temperature sensor;

the voltage division branch comprises a first resistor and a second resistor connected in series between a power supply and a ground;

a second input end of the comparator is connected to a node between the first resistor and the second resistor.

10. The motor application apparatus of claim 6 , comprising further:

a current sensor configured to detect the current of the motor and output a current detection signal to the microcontroller,

wherein the microcontroller comprises a cooling control module configured to receive a current detection signal outputted by the current sensor to determine the operation state of the motor, and the cooling control module outputs the first protection signal when a power loss of the motor is larger than a predetermined power loss and the rotation speed of the motor is lower than a predetermined rotation speed simultaneously, and a second input end of the OR gate receives the first protection signal.

11. The motor application apparatus of claim 9 , wherein the comparator outputs the second protection signal to start the cooling device, when a voltage value of the temperature detection signal outputted by the temperature sensor is higher than a voltage value across the second resistor.

12. The motor application apparatus of claim 10 , wherein the current sensor and the temperature sensor are integrated onto one circuit board.