If the motor is stalled or overloaded, it would try to start, then hum or strain while it heats up and either trips the breaker or activates the built-in thermal overload. But the trip should not be instantaneous when the motor is started - it'll take a second or few.
If the trip is immediate, then most likely it is not a bind or an overload. It is most likely a short (or nearly short) circuit, either between the two 220 legs, or between one of them to ground or neutral. It could either be in the motor, or in the wiring leading to it.
As a quick test, you may disconnect the wires at the motor, and insulate them with electrical tape or wirenuts so that they cannot contact anything. Then kick the power on briefly to see if the breaker trips. If so, it's the wiring. If not, it's the motor.