Motor device

摘要

A motor device includes a motor unit and a converter unit. The motor unit includes an inverter circuit; an inverter drive circuit; a brushless DC motor comprising a rotor and a stator; a first shunt resistor; a first input terminal; a second input terminal; a third input terminal; a first output terminal; and a first ground terminal. The converter unit includes a case; a AC/DC converter; a microcomputer; a first output terminal; a second output terminal; a third output terminal; a first input terminal; a second shunt resistor; and a second grounding terminal. The microcomputer calculates a current value by using the terminal voltage and a resistance value of the second shunt resistor, compares the current value with a specified current value, and limit or cut off the output of the analog control signal when the current value exceeds the specified current value.

主权项

1. A motor device, comprising:
a motor unit comprising:
an inverter circuit;an inverter drive circuit;a brushless DC motor comprising a rotor and a stator;a first shunt resistor connected to the inverter circuit;a first motor unit input terminal connected to the inverter drive circuit;a second motor unit input terminal connected to the inverter circuit;a third motor unit input terminal connected to the inverter drive circuit;a first motor unit output terminal connected to the inverter drive circuit; anda first ground terminal connected to the inverter circuit; a converter unit comprising:
a case;a AC/DC converter structured to convert an AC voltage to a DC voltage to be supplied to the motor unit;a microcomputer structured to receive a digital control signal and output an analog control signal;a first converter unit output terminal structured to output the analog control signal;a second converter unit output terminal structured to output the DC voltage to be supplied to the inverter circuit;a third converter unit output terminal structured to output the DC voltage to be supplied to the inverter drive circuit;a first converter unit input terminal structured to receive the position detection signal;a second shunt resistor connected to the first shunt resistor and the microcomputer; anda second grounding terminal;wherein the AC/DC converter and the microcomputer are provided within the case; wherein the case of converter unit is connected to the motor unit at the installation surface of the motor unit; the first motor unit input terminal and the first converter unit output terminal are connected; the second motor unit input terminal and the second converter unit output terminal are connected; the third motor unit input terminal and the third converter unit output terminal are connected; the first motor unit output terminal and the first converter unit input terminal are connected; the first grounding terminal and the second grounding terminal are connected; the inverter drive circuit is structured to receive the analog control signal outputted from the microcomputer and output a drive pulse signal to be supplied to the inverter circuit; and wherein the microcomputer is configured to detect a terminal voltage across the second shunt resistor, to calculate a current value by using the terminal voltage and a resistance value of the second shunt resistor, to compare the current value with a specified current value, and to limit or cut off the output of the analog control signal when the current value exceeds the specified current value.